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Constraining 20th‐century sea‐level rise in the South Atlantic Ocean J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-24 Thomas Frederikse; Surendra Adhikari; Tim J. Daley; Sönke Dangendorf; Roland Gehrels; Felix Landerer; Marta Marcos; Thomas L. Newton; Graham Rush; Aimée Slangen; Guy Wöppelmann
Sea level in the South Atlantic Ocean has only been measured at a small number of tide‐gauge locations, which causes considerable uncertainty in 20th‐century sea‐level trend estimates in this basin. To obtain a better‐constrained sea‐level trend in the South Atlantic Ocean, this paper aims to answer two questions. The first question is: can we combine new observations, vertical land motion estimates
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Analysis and Prediction of Significant Wave Height in the Beibu Gulf, South China Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-23 Huan Wang; Dongyang Fu; Dazhao Liu; Xiuchun Xiao; Xianqiang He; Bei Liu
A series of 40‐year significant wave height (SWH) data were extracted from the ERA‐Interim data set of the European Centre for Medium‐Range Weather Forecasts (ECMWF) for the Beibu Gulf and its adjacent waters in the South China Sea from 1979 to 2018. After that, data were first aggregated to annual and monthly average data. Through the analysis, the annual SWH had grown since 1984, reached a significant
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Sensitivity of the Baltic Sea Overturning Circulation to Long‐Term Atmospheric and Hydrological Changes J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-07 Manja Placke; H. E. Markus Meier; Thomas Neumann
The sensitivity of the overturning circulation in the Baltic Sea is analyzed with respect to long‐term changes in atmospheric and hydrological conditions by using two state‐of‐the‐art ocean circulation models: RCO (Rossby Centre Ocean model) with a reference simulation and various sensitivity experiments as well as MOM (Modular Ocean Model). Historical reconstructions since 1850 lasting for >150 years
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Seasonal variation, degradation and bioavailability of dissolved organic matter in the Changjiang Estuary and its adjacent East China Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-23 Chong‐Xiao Ji; Yan Chen; Gui‐Peng Yang
Systematic surveys to examine seasonal variation, degradation, and bioavailability of dissolved organic matter (DOM) in the Changjiang Estuary and the adjacent East China Sea (ECS) were conducted in July 2016 and February 2017. Concentrations of dissolved organic carbon (DOC) and total hydrolyzable amino acids (THAA) were higher in July than in February. THAA and chlorophyll a (Chl‐a) were positively
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Dispersion of buoyant and sinking particles in a simulated wind and wave‐driven turbulent coastal ocean J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-22 Todd Thoman; Tobias Kukulka; Kathleen Gamble
In shallow coastal oceans, turbulent flows driven by surface winds and waves and constrained by a solid bottom disperse particles. This work examines the mechanisms driving horizontal and vertical dispersion of buoyant and sinking particles for times much greater than turbulent integral time scales. Turbulent fields are modelled using a wind‐stress driven large eddy simulation (LES), incorporating
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Long–term observations reveal environmental conditions and food supply mechanisms at an Arctic deep‐sea sponge ground J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-22 Ulrike Hanz; Emyr Martyn Roberts; Gerard Duineveld; Andrew Davies; Hans van Haren; Hans Tore Rapp; Gert‐Jan Reichart; Furu Mienis
Deep‐sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep‐sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep‐sea sponge ground located on an Arctic Mid‐Ocean Ridge seamount. Hydrodynamic measurements were
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Lagrangian Reconstruction to Extract Small‐Scale Salinity Variability From SMAP Observations J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-26 Bàrbara Barceló‐Llull; Kyla Drushka; Peter Gaube
As the resolution of observations and models improves, emerging evidence indicates that ocean variability on 1–200‐km scales is of fundamental importance to ocean circulation, air‐sea interaction, and biogeochemistry. In many regions, salinity variability dominates over thermal effects in forming density fronts. Unfortunately, current satellite observations of sea surface salinity (SSS) only resolve
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Issue Information J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-22
No abstract is available for this article.
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Towards a multi‐platform assimilative system for North Sea biogeochemistry J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-20 Jozef Skákala; David Ford; Jorn Bruggeman; Tom Hull; Jan Kaiser; Robert R. King; Benjamin Loveday; Matthew R. Palmer; Tim Smyth; Charlotte A. J. Williams; Stefano Ciavatta
Oceanography has entered an era of new observing platforms, such as biogeochemical Argo floats and gliders, some of which will provide three‐dimensional maps of essential ecosystem variables on the North‐West European (NWE) Shelf. In a foreseeable future operational centres will use multi‐platform assimilation to integrate those valuable data into ecosystem reanalyses and forecast systems. Here we
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Study of sediment transport in a tidal channel‐shoal system: lateral effects and slack‐water dynamics J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-20 Zaiyang Zhou; Jianzhong Ge; D.S. van Maren; Zheng Bing Wang; Yu Kuai; Pingxing Ding
Lateral flows redistribute sediment and influence the morphodynamics of channel‐shoal systems. However, our understanding of lateral transport of suspended sediment during high and low water slack is still fairly limited, especially in engineered estuaries. Human interventions such as dike‐groyne structures influence lateral exchange mechanisms. The present study aims to unravel these mechanisms in
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Multiscale superposition and decomposition of field‐measured suspended sediment concentrations: implications for extending 1DV models to coastal oceans with advected fine sediments J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-20 Shaotong Zhang; Peter Nielsen; Pierre Perrochet; Yonggang Jia
One‐dimensional vertical (1DV) diffusion‐settling models are practical tools for sediment transport analysis of sands, which is mostly a local process. However, for fine sediments, the observed concentrations C(t) can be mixed via horizontal advection (HA) due to the lower settling velocity, which makes the C(t) not necessarily a local process, thus making 1DV models invalid. It is important to determine
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Convergence of Daily GRACE Solutions and Models of Submonthly Ocean Bottom Pressure Variability J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-08 Michael Schindelegger; Alexander A. Harker; Rui M. Ponte; Henryk Dobslaw; David A. Salstein
Knowledge of submonthly variability in ocean bottom pressure (pb) is an essential element in space‐geodetic analyses and global gravity field research. Estimates of these mass changes are typically drawn from numerical ocean models and, more recently, GRACE (Gravity Recovery and Climate Experiment) series at daily sampling. However, the quality of pb fields from either source has been difficult to
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On the Errors of Estimating Oceanic Eddy Kinetic Energy J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-18 Guidi Zhou; Xuhua Cheng
When evaluating the kinetic energy of the eddy field, using a flow‐decomposition method to split the eddies from the mean‐flow is often necessary. However, the kinetic energies of the eddy and mean‐flow may not sum up to the total energy, because of the existence of a third term, the residual kinetic energy (RKE). This paper attempts to thoroughly assess the RKE from both theoretical and observational
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The Route to Spring Phytoplankton Blooms Simulated by a Lagrangian Plankton Model J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-05 Kyung Min Noh; Yign Noh; Ashley Brereton; Jong‐Seong Kug
A Lagrangian plankton model (LPM) is developed, in which the motion of a large number of Lagrangian particles, representing a parcel of plankton, is calculated under the turbulence field simulated by large‐eddy simulation. A spring phytoplankton bloom is realized using the LPM, and the mechanism for its 1 generation is investigated. The criterion based on these results is proposed as , where δ E (=
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Upper Ocean Stratification in the Eastern Pacific during the SPURS‐2 Field Campaign J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-18 S. Katsura; J. Sprintall; F. M. Bingham
The region between a shallow mixed layer and a deep isothermal layer resulting from salinity stratification is called a barrier layer (BL). Since BLs hinder the surface heat and momentum exchange with the ocean subsurface, they play an important role in air‐sea interaction. Synoptic features and formation of BLs and associated temperature inversions (TIs) in the Eastern Pacific Fresh Pool (EPFP) were
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Slope‐intensified Storm‐induced Near‐inertial Oscillations in the South China Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-18 Ruixiang Li; Changsheng Chen; Wenjie Dong; Robert C. Beardsley; Zhongxiang Wu; Wenping Gong; Yuqiang Liu; Tongmu Liu; Danya Xu
The South China Sea (SCS) is a region vulnerable to tropical cyclones (TCs). An array of moored current meters and meteorological buoys was deployed within major pathways of TCs across the slope of the northern shelf of the SCS from September 1, 2017 through September 30, 2018. Three TCs, Khanun, SonTinh, and Mangkhut, traversed by the storm‐monitoring array in October 2017, July, and September 2018
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Trends and Transport Variability of the Circulation in the Subpolar Eastern North Atlantic J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-22 Hannah Nowitzki; Monika Rhein; Achim Roessler; Dagmar Kieke; Christian Mertens
The North Atlantic Current is the major pathway for warm and saline water from the subtropics into the subpolar North Atlantic. Its main branch crosses 47°/48°N in the western North Atlantic basin and further north the Mid‐Atlantic Ridge (MAR) before entering the eastern subpolar basin where it partly feeds the subpolar gyre. To quantify the meridional exchange of water between the subtropical and
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Water Mass Variability and Levantine Intermediate Water Formation in the Eastern Mediterranean Between 2015 and 2017 J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-18 Bettina A. Fach; Hasan Orek; Elif Yilmaz; Devrim Tezcan; Ilkay Salihoglu; Baris Salihoglu; Mohammed Abdul Latif
The physical characteristics of water masses in the Cilician Basin were analyzed based on recent, comprehensive in‐situ data. Nine seasonal cruises from June 2015 to November 2017 were carried out in an area located in the north‐eastern Levantine Basin between the coasts of Turkey and Cyprus. In this little studied area, the structure of the water column, its seasonal variability, and water formation
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Impact of Different Atmospheric Forcing Sets on Modeling Labrador Sea Water Production J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-18 Clark Pennelly; Paul G. Myers
A numerical modeling sensitivity study is carried out within the Labrador Sea by varying the atmospheric conditions. From forcing NEMO simulations with five atmospheric products commonly used in ocean modeling (DFS5.2, ERA‐Interim, CGRF, ERA5, and JRA55‐do), we calculate the air–sea heat fluxes that occur over the Labrador Sea (2002–2015 annual‐average net heat flux: −53.4, −51.0, −46.6, −58.5, and
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Persistent, Depth‐Intensified Mixing During The Western Mediterranean Transition's Initial Stages J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-12 S. Piñeiro; C. González‐Pola; J. M. Fernández‐Díaz; A. C. Naveira‐Garabato; R. Sánchez‐Leal; P. Puig; J. Salat; R. Balbin
Major deep‐convection activity in the northwestern Mediterranean during winter 2005 triggered the formation of a complex anomalous deep‐water structure that substantially modified the properties of the Western Mediterranean deep layers. Since then, evolution of this thermohaline structure, the so‐called Western Mediterranean Transition (WMT), has been traced through a regularly sampled hydrographic
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Waves in Western Long Island Sound: A Fetch‐Limited Coastal Basin J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-20 Y. Shin; A. Cifuentes‐Lorenzen; M. M. Howard Strobel; J. O'Donnell
This paper summarizes the statistics of observations of wind and surface gravity waves in Long Island Sound, a large estuarine embayment in southern New England. We examine the relationship between significant wave height and wind speed and direction and show that the significant wave height and dominant period in western Long Island Sound have an asymmetric response to the wind direction. Waves are
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Parameterizing the impact of seawater temperature and irradiance on dimethylsulfide (DMS) in the Great Barrier Reef and the contribution of coral reefs to the global sulfur cycle J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-15 R. L. Jackson; A. J. Gabric; P. A. Matrai; M. T. Woodhouse; R. Cropp; G. B. Jones; E. S. M. Deschaseaux; Y. Omori; E. L. McParland; H. B. Swan; H. Tanimoto
Biogenic emissions of dimethylsulfide (DMS) are an important source of sulfur to the atmosphere, with implications for aerosol formation and cloud albedo over the ocean. Natural aerosol sources constitute the largest uncertainty in estimates of aerosol radiative forcing and climate and thus, an improved understanding of DMS sources is needed. Coral reefs are strong point sources of DMS; however, this
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A Numerical Study of Onshore Ripple Migration Using a Eulerian Two‐phase Model J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-29 Ali Salimi‐Tarazouj; Tian‐Jian Hsu; Peter Traykovski; Zhen Cheng; Julien Chauchat
A new modeling methodology for ripple dynamics driven by oscillatory flows using a Eulerian two‐phase flow approach is presented in order to bridge the research gap between near‐bed sediment transport via ripple migration and suspended load transport dictated by ripple induced vortices. Reynolds‐averaged Eulerian two‐phase equations for fluid phase and sediment phase are solved in a two‐dimensional
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Particle dynamics in a managed navigation channel under different tidal conditions as determined using multiple radionuclide tracers J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-15 Jinlong Wang; Dekun Huang; Weiming Xie; Qing He; Jinzhou Du
Particle dynamics play significant roles in sedimentological and geomorphological processes as well as biogeochemical cycles in estuaries. We collected a suite of water samples from the North Passage of the Changjiang (Yangtze) Estuary during different tidal conditions in summer 2009 to observe variations in the particulate 234Th, 7Be, 210Pb, and 137Cs activities as well as in particle transport, deposition
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Influences of physical and biogeochemical variability of the central Red Sea during winter. J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-14 Nikolaos D. Zarokanellos; Burton H. Jones
The central Red Sea (CRS) has been characterized by significant eddy activity throughout the year. Weakened wintertime stratification contributes to enhanced vertical exchange. In winter 2014‐2015, an extended glider time series in the CRS captured this variability. Surface cooling and stronger winds resulted in deepening of the mixed layer (ML) to nearly 90 m. The vertical distributions of density
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Stronger variability in the Arctic Ocean induced by sea ice decline in a warming climate: Freshwater storage, dynamic sea level and surface circulation J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Qiang Wang
Arctic liquid freshwater content (FWC) influences both regional and large‐scale ocean dynamics and climate. In this paper the responses of Arctic FWC, sea surface height (SSH) and surface circulation to different atmospheric circulation modes and the impact of sea ice decline on these responses are investigated by using wind perturbation simulations. The responses are intensified by sea ice decline
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Evaluation of abandoned Huanghe Delta as an important carbon source for the Chinese marginal seas in recent decades J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Lijun Qi; Ying Wu; Shenliang Chen; Xiaona Wang
Increasing organic carbon (OC) inputs from coastal erosion contribute to large uncertainties in carbon cycling in coastal seas. The abandoned Huanghe Delta (AHD) is a typical coastal erosion region, which transports large amounts of eroded sediments to the Chinese marginal seas (CMS, not including the South China Sea). Here we investigated the organic geochemical characteristics of sedimentary organic
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Inter‐basin differences in ocean ventilation in response to variations in the Southern Annular Mode J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Darryn W. Waugh; Kial Stewart; Andrew McC. Hogg; Matthew H. England
The response of the ventilation of mode and intermediate waters to abrupt changes in the Southern Annular Mode (SAM) is examined by analyzing the ideal age in a global ocean‐sea ice model. The age response is shown to differ between the central Pacific Ocean and other basins. In the central Pacific there are large decreases in the age of subtropical mode and intermediate waters associated with a more
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The contribution of currents, sea‐swell waves, and infragravity waves to suspended‐sediment transport across a coral reef‐lagoon system. J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Andrew W.M. Pomeroy; Curt D. Storlazzi; Kurt J. Rosenberger; Ryan J. Lowe; Jeff E. Hansen; Mark L. Buckley
Coral reefs generate substantial volumes of carbonate sediment, which is redistributed throughout the reef‐lagoon system. However, there is little understanding of the specific processes that transport this sediment produced on the outer portions of coral reefs throughout a reef‐lagoon system. Furthermore, the separate contributions of currents, sea‐swell waves, and infragravity waves to transport
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Four types of baroclinic instability waves in the global oceans and the implications for the vertical structure of mesoscale eddies J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Ling Feng; Chuanyu Liu; Armin Köhl; Detlef Stammer; Fan Wang
Linear stability analysis is re‐conducted to fully understand the geostrophic distribution of the different types of baroclinic instability (BCI) in the global oceans, their correspondence to the different vertical structures of the observed mesoscale eddies, and the properties and formation mechanisms of the instability waves. Four principal vertical types of BCI are identified, which are found to
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Vorticity recirculation and asymmetric generation at a small headland with broadband currents J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Michael Kovatch; Falk Feddersen; Derek Grimes; Jamie MacMahan
Fixed acoustic Doppler current profiler (ADCP) velocity measurements are used to investigate headland vorticity generation and recirculation in ∼ 20 m depth around the small ( ∼ 1 km) central California headland Pt. Sal. To reduce vorticity estimation noise, velocities are reconstructed from the first two EOF modes representing ≈ 73% of the variance. Using fixed ADCPs, depth‐averaged vorticity is estimated
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Reconstructing Ocean Surface Current Combining Altimetry and Future Spaceborne Doppler Data, J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-13 Clement Ubelmann; Gérald Dibarboure; Lucile Gaultier; Aurélien Ponte; Fabrice Ardhuin; Maxime Ballarotta; Yannice Faugère
Two methods for the mapping of ocean surface currents from satellite measurements of sea level and future current vectors are presented and contrasted. Both methods rely on the linear and Gaussian analysis framework with different levels of covariance definitions. The first method separately maps sea level and currents with single‐scale covariance functions and leads to estimates of the geostrophic
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Postbomb Subtropical North Pacific Surface Water Radiocarbon History J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-17 Thomas P. Guilderson; Daniel P. Schrag; Ellen R. M. Druffel; Ron W. Reimer
We have generated a high‐resolution coral Δ14C record from the leeward side of the Big Island of Hawai’i in the subtropical North Pacific. The record spans 1947–1992, when the coral was collected, and includes a brief prebomb interval as well as the postbomb era. Mean prebomb (1947–1954) values average −55‰ (±1, SE of the mean) with a clear seasonal cycle. Values are less positive during winter when
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Cross‐Shore Flow and Implications for Carbon Export in the California Current Ecosystem: A Lagrangian Analysis J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-22 P. Chabert; F. d'Ovidio; V. Echevin; M. R. Stukel; M. D. Ohman
Eastern Boundary Current Upwelling Systems are regions of elevated primary production and carbon export and thus play a central role in the global carbon cycle. In these regions, nutrient upwelling occurs in a narrow region close to the coast, but primary production and carbon export are typically observed across a broader region. The fact that productive waters reach the open ocean has important consequences
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Momentum Flux Balance at the Air‐Sea Interface J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-19 Wenli Qiao; Lichuan Wu; Jinbao Song; Xue Li; Fangli Qiao; Anna Rutgersson
Ocean waves can spatiotemporally redistribute the momentum flux at the air‐sea interface, which varies with the sea state. Traditional atmosphere‐ocean coupled systems assume the ocean‐side stress (τoc) to be identical to the air‐side stress (τa); consequently, the role of ocean waves is neglected. In this study, the wave impacts on the air‐sea momentum flux are investigated based on 1‐year high‐resolution
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Anthropogenic Iron Deposition Alters the Ecosystem and Carbon Balance of the Indian Ocean Over a Centennial Timescale J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-02 Anh L. D. Pham; Takamitsu Ito
Phytoplankton growth in the Indian Ocean is generally limited by macronutrients (nitrogen: N and phosphorus: P) in the north and by micronutrient (iron: Fe) in the south. Increasing atmospheric deposition of N and dissolved Fe (dFe) into the ocean due to human activities can thus lead to significant responses from both the northern and southern Indian Ocean ecosystems. Previous modeling studies investigated
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Variance of Bottom Water Temperature at the Continental Margin of the Northern South China Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-12 Peng‐Qi Huang; Xian‐Rong Cen; Shuang‐Xi Guo; Yuan‐Zheng Lu; Sheng‐Qi Zhou; Xue‐Lin Qiu; Jia‐Zheng Zhang; Zhong‐Liang Wu; Guang‐Hui Han
High‐resolution temperature variation was examined about 40 days near the ocean bottom at 20 sites within an area of 110 × 120 km2 close to the continental margin of the northern South China Sea (depth ≈ 4,000 m). The monitoring depth (0.5 m above the bottom) was presumably within the lower part of the bottom mixed layer, compared to its median thickness of 63 m. At all sites, the bottom water had
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On the Along‐Slope Heat Loss of the Boundary Current in the Eastern Arctic Ocean J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-22 Kirstin Schulz; Markus Janout; Yueng‐Djern Lenn; Eugenio Ruiz‐Castillo; Igor Polyakov; Volker Mohrholz; Sandra Tippenhauer; Krissy Anne Reeve; Jens Hölemann; Benjamin Rabe; Myriel Vredenborg
This study presents recent observations to quantify oceanic heat fluxes along the continental slope of the Eurasian part of the Arctic Ocean, in order to understand the dominant processes leading to the observed along‐track heat loss of the Arctic Boundary Current (ABC). We investigate the fate of warm Atlantic Water (AW) along the Arctic Ocean continental margin of the Siberian Seas based on 11 cross‐slope
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A changing Arctic Ocean: How measured and modeled 129I distributions indicatefundamental shifts in circulation between 1994 and 2015 J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-12 John N. Smith; Michael Karcher; Nuria Casacuberta; William J. Williams; Tim Kenna; William M. Smethie
129I measurements on samples collected during GEOTRACES oceanographic missions in the Arctic Ocean in 2015 have provided the first synoptic 129I sections across the Eurasian, Canada and Makarov Basins. During the 1990s, increased discharges of 129I from European nuclear fuel reprocessing plants produced a large, tracer spike whose passage through the Arctic Ocean has been followed by 129I time series
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Particulate scattering and backscattering in relation to the nature of particles in the Red Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-12 Malika Kheireddine; R. J. W. Brewin; M. Ouhssain; B. J. Jones
Measurements of light scattering can be used to quantify the concentration and composition of oceanic particles, and resolve biogeochemical processes spanning different time and space scales. In this paper, we analyze the first dataset, collected over wide spatial scales in the Red Sea, of particulate scattering (), particulate backscattering (), particulate absorption and chlorophyll‐a concentration
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A Combined Modeling and Measurement Approach to Assess the Nodal Tide Modulation in the North Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-12 Robert Hagen; Andreas Plüß; Leon Jänicke; Janina Freund; Jürgen Jensen ; Frank Kösters
The correct representation of the 18.61 year nodal tide is essential for an interpretation of the evolution of mean sea level, as errors cause misleading bias. The nodal tide is currently estimated by applying correction factors in harmonic analysis, which are derived from the equilibrium tide. From the equilibrium tide, correction values f for amplitude and u for phase are determined, which alter
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Retrieval of Ocean Wave Heights from Spaceborne SAR in the Arctic Ocean with a Neural Network J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-12 Ke Wu; Xiao‐Ming Li; Bingqing Huang
The twin Sentinel‐1 (S1) satellites have been extensively acquiring synthetic aperture radar (SAR) data in the Arctic, providing the unique opportunity to obtain ocean dynamic parameters with both high spatial resolution and wide swath coverage in the Arctic Ocean. In this paper, we proposed a method for retrieving the ocean significant wave height (SWH) from S1 SAR data in horizontal‐horizontal (HH)
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Hydrodynamic drivers of the 2013 marine heatwave on the North West Shelf of Australia J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-11 Anna Maggiorano; Ming Feng; Xiao Hua Wang; Liz Ritchie; Clair Stark; Frank Colberg; Jim Greenwood
The 2012/2013 Ningaloo Niño induced a strong marine heatwave (MHW) event on Australia's North West Shelf (NWS) during the austral summer, starting in December 2012 and peaking in January and February 2013. A high‐resolution regional numerical model based on the Regional Ocean Modelling System (ROMS) was implemented to simulate the variability of the upper ocean temperature and ocean circulation and
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New Insight Into the Onshore Intrusion of the Kuroshio Into the East China Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-17 Xuan Cui; Dezhou Yang; Chaojiao Sun; Xingru Feng; Guandong Gao; Lingjing Xu; Baoshu Yin
The Kuroshio Current, a vigorous western boundary current in the Pacific, is responsible for bringing high temperature, high salinity, and phosphate‐rich open ocean water into the East China Sea (ECS) when it flows past Taiwan and generates a branch current, known as the Kuroshio Branch Current (KBC), which intrudes onto the continental shelf of the ECS. Based on observations and numerical modeling
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On the Problem of Modeling the Boat Wake Climate: The Florida Intracoastal Waterway J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-24 Carola Forlini; Rizwan Qayyum; Matt Malej; Michael‐Angelo Y.‐H. Lam; Fengyan Shi; Christine Angelini; Alex Sheremet
Quantifying and forecasting the impact of boat traffic on the health of coastal ecosystems must account for the multiscale nature of the process: from minutes (individual wakes), to days (tidal phase), weeks, and longer (tide modulation, seasonal traffic). Direct numerical simulations covering all these scales are difficult, not in the least because specifying the vessel type and navigation characteristics
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Mesoscale Variability in the Boundaries of the Oxygen Minimum Zone in the Eastern South Pacific: Influence of Intrathermocline Eddies J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-18 P. A. Auger; J. P. Bento; S. Hormazabal; C. E. Morales; A. Bustamante
The vertical variability in the oxygen minimum zone (OMZ) in the eastern South Pacific (ESP; 0–40°S) is characterized by the influence of anticyclonic intrathermocline eddies (ITEs), which are subsurface‐intensified mesoscale features that are frequently generated in the coastal upwelling zone off Peru and Chile. The unique lens‐shaped signatures that ITEs leave on temperature, salinity, and dissolved
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Momentum Flux Convergence From Internal Tides in the North Equatorial Countercurrent Upstream of a Submarine Ridge Near Merir Island, Palau J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-12 T. M. Shaun Johnston; Celia Y. Ou
In the presence of a mean flow, theory and models for internal tide generation at small‐amplitude topography show (a) internal tides produce a net momentum flux that extends to the surface and (b) fluxes are directed preferentially upstream. Here, we observe internal tides propagating into the North Equatorial Countercurrent during two spatial surveys near a submarine ridge. On the second survey during
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Simultaneous Observations of Turbulent Reynolds Stress in the Ocean Surface Boundary Layer and Wind Stress over the Sea Surface J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-18 Chuan Jiang Huang; Fangli Qiao
This study used high‐frequency acoustic instruments mounted on an offshore observation platform to obtain simultaneous in situ measurements of sea surface winds and ocean currents. The acquired data were used to compare quantitatively the turbulent Reynolds stress in the ocean surface boundary layer (OSBL) and the wind stress over the sea surface. During the study period (∼10 d), the sea state was
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The summer heat balance of the Oregon inner shelf over two decades: intraseasonal variability J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-10 E. Lemagie; A. Kirincich; S. Lentz
This paper examines the heat balance of the inner shelf along the U.S. West Coast using 14 years of summer temperature and velocity observations in 15 m water depth. Previous work at this site found no year‐to‐year variability in the observed mean summer temperature change despite significant warming due to surface heat flux and variable cooling due to across‐shelf heat flux. Here, the processes that
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Spurious rollover of wave attenuation rates in sea ice caused by noise in field measurements J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-10 Jim Thomson; Lucia Hošeková; Michael H. Meylan; Alison L Kohout; Nirnimesh Kumar
The effects of instrument noise on estimating the spectral attenuation rates of ocean waves in sea ice are explored using synthetic observations in which the true attenuation rates are known explicitly. The spectral shape of the energy added by noise, relative to the spectral shape of the true wave energy, is the critical aspect of the investigation. A negative bias in attenuation that grows in frequency
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Validation and Calibration of Nadir SWH Products From CFOSAT and HY‐2B With Satellites and In Situ Observations J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-13 Xiuzhong Li; Ying Xu; Baochang Liu; Wenming Lin; Yijun He; Jianqiang Liu
The China France Oceanography Satellite (CFOSAT) and Haiyang‐2B (HY‐2B) satellites were successively launched in China on the 29th and 25th of October 2018, respectively. HY‐2 B carries the second Chinese radar altimeter along with three other microwave sensors, whereas CFOSAT contains the first Surface Waves Investigation and Monitoring (SWIM) instrument and a fan beam rotating scatterometer. As missions
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Observed Water Exchange Between the South China Sea and Java Sea Through Karimata Strait J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-21 T. F. Xu; Z. X. Wei; R. D. Susanto; S. J. Li; Y. G. Wang; Y. Wang; X. Q. Xu; T. Agustiadi; M. Trenggono; B. Sulistyo; A. Setiawan; A. Kuswardani; G. H. Fang
Volume, heat and freshwater transports from the South China Sea (SCS) to the Java Sea through the Karimata Strait are estimated based on direct measurements of current, temperature, salinity, and satellite observations. Subject to strong seasonal variability, the volume, heat, freshwater transports are −1.98 ± 0.23 Sv (1 Sv = 106 m3/s), −209.68 ± 15.19 TW (1 TW = 1012 W), −99.87 ± 15.11 mSv (1 mSv = 10‐3 Sv)
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Estuarine Circulation, Mixing, and Residence Times in the Salish Sea J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-22 P. MacCready; R. M. McCabe; S. A. Siedlecki; M. Lorenz; S. N. Giddings; J. Bos; S. Albertson; N. S. Banas; S. Garnier
A realistic numerical model is used to study the circulation and mixing of the Salish Sea, a large, complex estuarine system on the United States and Canadian west coast. The Salish Sea is biologically productive and supports many important fisheries but is threatened by recurrent hypoxia and ocean acidification, so a clear understanding of its circulation patterns and residence times is of value.
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Seasonal and Interannual Variability of the Subtropical Front in the New Zealand Region J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-17 Erik Behrens; Andrew McC. Hogg; Matthew H. England; Helen Bostock
The meridional variability of the Subtropical Front (STF) and the drivers of variability on interannual time scales in the New Zealand region are analyzed using a multi‐decadal eddy‐resolving ocean hindcast model, in comparison with Argo data. The STF marks the water mass boundary between subtropical waters and subantarctic waters, and is defined as the southern‐most location of the 11°C isotherm and
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Surface currents and significant wave height gradients: matching numerical models and high‐resolution altimeter wave heights in the Agulhas current region J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-02-09 Gwendal Marechal; Fabrice Ardhuin
Advances in the understanding and modelling of surface currents have revealed the importance of internal waves, mesoscale and submesoscale features. Indeed all these features should have a large influence on wind waves and in particular on wave heights. Still, the quantitative impact of currents on waves is not well known due to the complexity of the random wave fields and currents that are found in
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A Regional, Early Spring Bloom of Phaeocystis pouchetii on the New England Continental Shelf J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-15 Walker O. Smith; Weifeng G. Zhang; Andrew Hirzel; Rachel M. Stanley; Meredith G. Meyer; Heidi Sosik; Philip Alatalo; Hilde Oliver; Zoe Sandwith; E. Taylor Crockford; Emily E. Peacock; Arshia Mehta; Dennis J. McGillicuddy
The genus Phaeocystis is distributed globally and has considerable ecological, biogeochemical, and societal impacts. Understanding its distribution, growth and ecological impacts has been limited by lack of extensive observations on appropriate scales. In 2018, we investigated the biological dynamics of the New England continental shelf and encountered a substantial bloom of Phaeocystis pouchetii.
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Long‐term Trends in Dissolved Organic Matter Composition and Its Relation to Sea Ice in the Canada Basin, Arctic Ocean (2007–2017) J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-17 C. DeFrancesco; C. Guéguen
Absorbance and fluorescence properties of dissolved organic matter (DOM) were measured in the upper and lower polar mixed layer (UPML and LPML, respectively) over an 11‐year period (2007–2017) to assess for yearly changes in the quality and quantity of colored and fluorescent DOM (CDOM and FDOM, respectively) in relation with sea ice concentration in central Canada Basin waters. The LPML waters were
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Seasonal and Interannual Variability in the Sea Surface Temperature Front in the Eastern Pacific Ocean J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2021-01-21 Yuntao Wang; Jin Liu; Hailong Liu; Pengfei Lin; Yeping Yuan; Fei Chai
Fifteen years of satellite observations of sea surface temperature (SST) are used to identify frontal activities in the eastern Pacific Ocean. The frontogenesis and variability of frontal activities are mainly determined by wind forces. Strong frontal activities are distributed mainly near the coast and decrease with increasing offshore distance. The seasonal cycle dominates the variability in the
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Observations and Modeling of Ocean Circulation in the Seychelles Plateau Region J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-12 Alma Carolina Castillo‐Trujillo; Isabella B. Arzeno‐Soltero; Sarah N. Giddings; Geno Pawlak; Julie McClean; Luc Rainville
The ocean circulation around and over the Seychelles Plateau (SP) is characterized using 35 months of temperature and velocity measurements along with a numerical model. The results here provide the first documented description of the ocean circulation atop the SP. The SP is an unusually broad (∼200 km), shallow (∼50 m) plateau, dropping off steeply to the abyss. It is situated in a dynamic location
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Ocean Swell Comparisons Between Sentinel‐1 and WAVEWATCH III Around Australia J. Geophys. Res. Oceans (IF 3.559) Pub Date : 2020-12-24 S. S. Khan; E. R. Echevarria; M. A. Hemer
An intercomparison between directional wave spectra derived from Sentinel‐1 Synthetic Aperture Radar (SAR) satellites and a WAVEWATCH III model hindcast in the wider Australian region is presented. The coastal buoy network around Australia is considerably sparse, and only a handful of buoy measurements exist in deeper oceans. National and regional scale wave models require validation and verification
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