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Temporal shifts in prokaryotic metabolism in response to organic carbon dynamics in the mesopelagic ocean during an export event in the Southern ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2024-02-10 Rachel R.-P. Rayne, Sarah L.C. Giering, Manuela Hartmann, Joost Brandsma, Richard D. Sanders, Claire Evans
As the major term in downward organic carbon flux attenuation, determining prokaryotic metabolism over depth in the mesopelagic ocean is crucial for constraining the efficiency of the gravitational biological carbon pump (BCP). We hypothesize that the enhancement of particulate organic carbon (POC) concentrations in the mesopelagic twilight zone during export events leads to a temporally dynamic prokaryotic
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The spatial distribution and environmental effects on hotspots and coldspots of micronekton in the southwestern Indian Ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2024-01-19 Shujie Wan, Xinjun Chen
Micronekton communities show large-scale spatiotemporal patterns in pelagic acoustic scattering layers. They are one of the most conspicuous and ecologically-important components of the vast mesopelagic zone of the world's oceans. They play an important role in fishery resources and marine ecology research. In this study, acoustic data from the southwestern Indian Ocean were used to perform a hotspot
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Acoustic characterization of fish and macroplankton communities in the seychelles-chagos thermocline ridge of the southwest Indian ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2024-01-01 Myounghee Kang, Sunyoung Oh, Wooseok Oh, Dong-Jin Kang, SungHyun Nam, Kyounghoon Lee
In this study, we describe the dynamics of the sound scattering layers (SSLs), particularly those of fish and macroplankton communities in the epipelagic layer, in the Seychelles-Chagos Thermocline Ridge (SCTR) of the southwest Indian Ocean using hydroacoustic data, net sampling, and oceanographic information. Overall, the acoustic backscattering values of the fish community were considerably higher
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Changing marine biosphere in the West Pacific Ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2024-01-04 Hong G, Zuo F, Qin K
Abstract not available
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The role of subsurface instabilities for increasing chlorophyll concentrations in a warming southern Indian ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2024-01-01 Yi Xu, Ying Wu, Jing Zhang
A warming climate is expected to intensify the stratification of the upper ocean in tropical and subtropical regions, which in turn results in decreases in the primary productivity for these oligotrophic areas. To assess if there is trended change in primary productivity in the southern Indian Ocean (IO) with known striking temperature increase, we use 17-years of satellite chlorophyll (Chl) data and
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Investigation of ocean environmental variables and their variations associated with major Loop Current eddy-shedding events in the Gulf of Mexico Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-12-11 Nazanin Chaichitehrani, Ruoying He
The eddy kinetic energy (EKE) variability associated with 26 major Loop Current eddies (LCEs) in the Gulf of Mexico from 1994 through 2019 was investigated. We employed 3D multivariate observation-based ARMOR3D monthly ocean analyses of salinity, temperature, and geostrophic velocity field data. In addition, we used ERA5 wind data, the fifth generation of the European Centre for Medium-Range Weather
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Seasonal variations of sinking velocities in Austral diatom blooms: Lessons learned from COMICS Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-12-05 M. Villa-Alfageme, N. Briggs, E. Ceballos-Romero, F. de Soto, C. Manno, S.L.C. Giering
The sinking velocity (SV) of organic particles is a critical driver of carbon transport to the deep sea. Accurate determination of marine particle SV and their influencing factors is therefore a key to better understanding of biological carbon storage in the ocean. We used two different approaches to estimate average SVs of particles during a Southern Ocean spring bloom (North of South Georgia): optical
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Mean circulation and its seasonal cycle on the West Florida Shelf as evidenced by multi-decadal time series of moored currents and winds Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-11-08 Jason A. Law, Robert H. Weisberg, Yonggang Liu, Dennis A. Mayer, Jeffrey C. Donovan
Time series from a moored array of current velocity and surface meteorological sensors, some with record lengths as long as 25 years, are used to describe both the long-term mean circulation and its seasonal variations on the West Florida Continental Shelf (WFS). The moorings are part of the University of South Florida's Coastal Ocean Monitoring and Prediction System (USF-COMPS), a network of ocean
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An observing system experiment framework for the tropical Indian Ocean salinity: A case study using a constellation of three satellites Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-22 Smitha Ratheesh, Neeraj Agarwal, Rashmi Sharma
In this study impact of assimilating Sea Surface Salinity (SSS) from multi-satellites (SMOS, Aquarius and SMAP) on numerical ocean model simulations in the north Indian Ocean has been analysed under the observing system experiment (OSE) framework. Daily data sets of Aquarius, SMAP and SMOS, which were available for a common period of April–May 2015, are used to constrain the ocean model using ensemble
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Spatial variability in plankton metabolic balance in the tropical Indian Ocean during spring intermonsoon Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-16 V.V.S.S. Sarma, M.H.K. Prasad, C.K. Sherin, K.R. Mangalaa
The tropical Indian Ocean consists of three basins, namely the Arabian Sea (AS), Bay of Bengal (BoB) and Southern Indian Ocean (SIO), with relatively nutrient-rich waters in the former two basins. It is hypothesized that the excess carbon produced in the northern Indian Ocean may support heterotrophic carbon demand in the SIO. In order to test this hypothesis, deck incubation experiments were conducted
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Advanced marine technologies for ocean research Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-14 Allison Miller, Jyotika I. Virmani
Technology is fundamental to understanding our ocean and has been used to conduct oceanographic research for over a century. We are in an age of fast innovation and technical advancements that is pushing the boundaries of marine research, exploration, data collection, and telecommunications at sea. Through this, scientists are gaining the ability to collect data at reduced costs, more efficiently,
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Suspended particles are hotspots of microbial remineralization in the ocean's twilight zone Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-12 V. Hemsley, J. Füssel, M.T. Duret, R.R. Rayne, M.H. Iversen, S.A. Henson, R. Sanders, P. Lam, M. Trimmer
The sinking of photosynthetically produced organic carbon from the ocean surface to its interior is a significant term in the global carbon cycle. Most sinking organic carbon is, however, remineralized in the mesopelagic zone (∼100 m–1000 m), thereby exerting control over ocean-atmosphere carbon dioxide (CO2) partitioning and hence global climate. Sinking particles are considered hotspots of microbial
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Ocean-atmosphere heat exchange seasonal cycle on the West Florida Shelf derived from long term moored data Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-11 Luis Sorinas, Robert H. Weisberg, Yonggang Liu, Jason Law
Twenty-three years of surface meteorological and oceanographic data sampled from moored buoys are used to study the seasonal and interannual variations of ocean–atmosphere heat exchange and its influence on West Florida Continental Shelf (WFS) water temperature and stratification. The data are from the University of South Florida's Coastal Ocean Monitoring and Prediction System (COMPS), part of the
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Hydrodynamic response to bathymetric changes in Tampa Bay, Florida Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-11 Jing Chen, Yonggang Liu, Robert H. Weisberg, Steven A. Murawski, Sherryl Gilbert, David F. Naar, Lianyuan Zheng, Matthew Hommeyer, Catherine Dietrick, Mark E. Luther, Cheryl Hapke, Edward Myers, Saeed Moghimi, Corey Allen, Liujuan Tang, Bahram Khazaei, Shachak Pe'eri, Ping Wang
Bathymetric changes within estuarine and coastal waters can alter the hydrodynamic evolution of sea level and currents, which in turn can influence the ecosystem by altering material property distributions. Here we apply the Tampa Bay Coastal Ocean Model (TBCOM), with an unstructured, high-resolution grid to investigate the hydrodynamic response to bathymetric changes at the periphery of the Tampa
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Impacts of tidal mixing on diurnal and intraseasonal air-sea interactions in the Maritime Continent Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-11 John Steffen, Hyodae Seo, Carol Anne Clayson, Suyang Pei, Toshiaki Shinoda
The Maritime Continent (MC) is a region with enhanced tidal mixing and ocean cooling, which influences regional-scale sea surface temperatures (SSTs). We examine the coupled impacts of tidal mixing on near-surface stratification, SST, and deep convection on diurnal and intraseasonal time-scales, using ensembles of high-resolution, coupled ocean-atmosphere regional model simulations, with and without
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Export of Dissolved Organic Carbon (DOC) compared to the particulate and active fluxes near South Georgia, Southern Ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-10-02 Elisa Lovecchio, Louis Clément, Claire Evans, Rachel Rayne, Cynthia Dumousseaud, Saeed Roshan, Sarah L.C. Giering, Adrian Martin
Quantifying the relative contributions of the export of particulate organic carbon (POC), dissolved organic carbon (DOC) and active fluxes by migrating organisms is essential to understand the functioning and vulnerability of the ocean's biological pump. However, these fluxes are rarely measured at the same time. Here we provide a first simultaneous comparison of these biological pump components in
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Intraseasonal oscillations of the Andaman Sea thermocline Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-09-27 Sreedevi P. Vasu, P.N. Vinayachandran
Variations in the upper ocean thermal structure have significant implications for air-sea interaction and upper-ocean ecosystem processes. Vertical profiles of temperature measured by a moored buoy located at 10.5°N, 94°E in the Andaman Sea and simulation by an Indian Ocean model are used in this study to characterise the intraseasonal variations (ISV) in the Andaman Sea (AndS) thermal structure and
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Spatial distribution of vertical carbon fluxes on the Agulhas Bank and its possible implication for the benthic nepheloid layer Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-09-21 Nwabisa V. Malongweni, Emma Rocke, Michael J. Roberts, Sarah L.C. Giering
Vertical particle fluxes of particulate organic carbon (POC), chlorophyll a (Chl a) and biogenic silica (bSi) were measured on the productive shelf of southern Africa, the Agulhas Bank (AB), in March 2019. Sinking particulate material in the form of aggregates is hypothesized to form the benthic nepheloid layer (BNL) which is a turbid layer found near the seabed. This layer is known to affect the spawning
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Predictive performance from abundance distribution models of Vinciguerria lucetia larvae in the southern portion of the California current system using XGBOOST Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-09-24 Rubén Esteban García-Gómez, Gerardo Aceves-Medina, Héctor Villalobos, Sylvia Patricia Adelheid Jiménez Rosenberg, Reginaldo Durazo
Vinciguerria lucetia is a mesopelagic fish whose larvae show an almost permanent presence in the southern portion of the California Current System. Due to its sensitivity to environmental changes, the species has been considered an indicator of water masses and interannual variability. Fish larvae abundance registered from 1997 to 2015 by the program Investigaciones Mexicanas de la Corriente de California
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Short-term forecast of Karenia brevis trajectory on the West Florida Shelf Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-09-23 Yonggang Liu, Robert H. Weisberg, Lianyuan Zheng, Katherine A. Hubbard, Eric G. Muhlbach, Matthew J. Garrett, Chuanmin Hu, Jennifer P. Cannizzaro, Yuyuan Xie, Jing Chen, Sebin John, Laura Y. Liu
Blooms of the toxic dinoflagellate Karenia brevis, also known as harmful algal blooms (HABs) or red tides, occur almost annually on the west coast of Florida, killing fish and other marine life, threatening public health and adversely impacting local economies. Mitigating such effects requires improved red tide forecast capabilities on the West Florida Shelf. A short-term Lagrangian trajectory forecast
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The Lobo-lobo fry fishery in the western Visayan Sea, Philippines: Abundance, catch composition, and potential fisheries impact Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-09-01 Alexanra Bagarinao-Regalado, Wilfredo L. Campos, Lucas R. Felix, Ryan Dexter Piloton
Lobo-lobo are small fishes that are caught using fine mesh nets in the western Visayan Sea whose market extends outside of the Visayan Sea, and perhaps even outside of the country. With high consumer demands, it is targeted year-round. Catches of fine-meshed boat seines operating in the waters off Concepcion, Iloilo which target large amounts of small and early juvenile fishes were monitored daily
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A data-assimilative modeling investigation of Gulf Stream variability Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-19 Shun Mao, Ruoying He, John Bane, Glen Gawarkiewicz, Robert E. Todd
An advanced data-assimilative ocean circulation model is used to investigate Gulf Stream (GS) variability during 2017–2018. The modeling system applies a strong-constraint, 4D variational data assimilation algorithm. It assimilates satellite-based sea surface height and sea surface temperature measurements and in situ temperature and salinity profiles. Model skill assessment metrics along with comparisons
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Seasonal variability of eddy kinetic energy in the Banda Sea revealed by an ocean model: An energy budget perspective Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-19 Zhanjiu Hao, Zhenhua Xu, Ming Feng, Peiwen Zhang, Jia You, Baoshu Yin
Seasonal eddy kinetic energy (EKE) variability in the Banda Sea during 1993–2014 is studied from an energy budget perspective, based on the outputs of Ocean Forecasting Australian Model version 3. High EKE is confined within the upper 300 m of the western Banda Sea with the largest intensity exceeding 3 × 103 J/m2 in the northwest monsoon (NWM) season. In this strong EKE region during NWM, eddies derive
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Sea surface temperature trends for Tampa Bay, West Florida Shelf and the deep Gulf of Mexico Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-19 Alexander K. Nickerson, Robert H. Weisberg, Lianyuan Zheng, Yonggang Liu
Sea surface temperatures for Tampa Bay, the West Florida Continental Shelf (WFS) and the adjacent deep Gulf of Mexico are examined for trends. Data sets are from stations maintained by the Hillsborough County Environmental Protection Commission, buoys maintained by the University of South Florida Coastal Ocean Monitoring and Prediction System and the National Oceanic and Atmosphere Administration (NOAA)
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Gulf of Mexico larval dispersal: Combining concurrent sampling, behavioral, and hydrodynamic data to inform end-to-end modeling efforts through a Lagrangian dispersal model Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-22 Kelly Vasbinder, Cameron H. Ainsworth, Yonggang Liu, Robert H. Weisberg
We developed a Lagrangian larval dispersal model to estimate trajectories for eleven fish taxa inhabiting the Gulf of Mexico (GOM). Dispersal models are at family level resolution for Scaridae, Lutjanidae, Scombridae, Labridae, Ophichthidae, and Ophidiidae, at genus level resolution for Hemanthias, and at species level resolution for Trachurus lathami, Decapterus punctatus, Katsuwonus pelamis, and
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A Tampa Bay coastal ocean model (TBCOM) nowcast/forecast system Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-21 Jing Chen, Robert H. Weisberg, Yonggang Liu, Lianyuan Zheng, Jason Law, Sherryl Gilbert, Steven A. Murawski
As a partially mixed estuary, Tampa Bay is influenced both by its connections to the adjacent Gulf of Mexico (GOM) and what occurs locally within the estuary. To assist in addressing the many scientific questions arising from various environmental factors, a very high resolution Tampa Bay Coastal Ocean Model (TBCOM) is modified to downscale from the deep GOM, across the continental shelf and into Tampa
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Three decades of ocean warming impacts on marine ecosystems: A review and perspective Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-11 Roberto M. Venegas, Jorge Acevedo, Eric A. Treml
Ocean warming, primarily resulting from the escalating levels of greenhouse gases in the atmosphere, leads to a rise in the temperature of the Earth's oceans. These gases act as heat-trapping agents, contributing to the overall phenomenon of global warming. In order to gain a comprehensive understanding of how ocean warming impacts marine ecosystems, a thorough literature review was conducted over
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Monsoonal variation and its impact on the feeding habit of Bali Sardinella (S. lemuru Bleeker, 1853) in Bali Strait Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-08-03 A. Sartimbul, H. Nakata, E.Y. Herawati, E. Rohadi, D. Yona, L.I. Harlyan, A.D.R. Putri, V.A. Winata, R.I. Khasanah, Z. Arifin, R.D. Susanto, F.M. Lauro
Sardinella lemuru is known as a highly opportunistic and flexible forager. Their high abundance in the coastal upwelling of Bali Strait was initially attributed to their feeding habit on phytoplankton and hence attaining higher catch. It was challenged by subsequent reports which suggested zooplankton as their main diet. This difference is due to the lack of information on the one-year cycle of its
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Editorial Board Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-07-27
Abstract not available
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Near-inertial oscillations in the deep Gulf of Mexico Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-07-06 Yingli Zhu, Xinfeng Liang
Near-inertial oscillations (NIOs) are important for maintaining turbulent mixing that affects ocean circulation, biogeochemistry, and climate. The spatial and temporal variability of NIOs in the deep part of the Gulf of Mexico (GoM) has rarely been reported. In this study, a collection of moored current observations was used to examine the spatiotemporal variability of NIOs in the GoM. In the upper
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Distinct patterns of coral lesion composition from national/quasi-national marine parks of Kerama and Yoron Islands, Ryukyu Archipelago Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-07-03 Dio Dirgantara, Mariyam Shidha Afzal, Takashi Nakamura
A wide variety of coral communities are found in the Ryukyu Archipelago in southern Japan. Although reports of coral diseases and lesions in this region have increased since the 2000's, the variations of coral diseases among islands are somewhat limited. In this study, we conducted surveys to reveal the coral lesion assemblage and patterns in the marine national park area of Kerama Island and the quasi-national
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Sea surface temperature predictability assessment with an ensemble machine learning method using climate model simulations Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-06-24 Fabio Boschetti, Ming Feng, Jason R. Hartog, Alistair J. Hobday, Xuebin Zhang
Ensemble models, statistical analysis and machine learning (ML) can be used to predict novel conditions in a rapidly changing ocean. Traditionally, ML has been understood as a purely data-driven approach and has been used on both observational and model data to forecast Sea Surface Temperature (SST) anomalies. Here we use ML trained only on climate model simulations to predict regional SST variations
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Algal contribution to organic carbon sequestration and its signatures in a tropical seagrass meadow Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-06-06 Natasha Arina, Nur Hidayah, Nur Hazlin Hazrin-Chong, Mohammad Rozaimi
Algae form prolific coastal habitats and contribute the largest carbon dioxide (CO2) flux globally. Most of the algal biomass is transported to the coastal ocean as particulate organic matter (OM), of which the contribution of carbon occurs mainly in depositional environments. Identifying the algal contribution alongside other major sources of organic carbon (OC) is crucial for determining allochthonous
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Habitat and benthic fauna of the Wallaby-Cuvier escarpment, SE Indian ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-05-25 Todd Bond, Yakufu Niyazi, Jessica L. Kolbusz, Alan J. Jamieson
The Wallaby-Cuvier Escarpment is a 700 km long, NW-SE trending linear geological feature that marks the southern boundary of the Cuvier Plateau. The Plateau rises from the adjacent 5500 m deep abyssal plain to a topographical high of 3000 m, approximately 450 km off the coast of Western Australian. In 2021, a 50 km long segment of the escarpment, covering an area of 1700 km2, was mapped by a high-resolution
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Tortonian silicoflagellates from the offshore of northeast Indian Ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-05-15 Lopamudra Roy, Kevin McCartney, Amit K. Ghosh, Ajoy Kumar Bhaumik, Sarajit Sensarma
Analysis of the Tortonian sediments in the northeast Indian Ocean from NGHP–01–17A drilled at Andaman Basin shows 22 silicoflagellate taxa belonging to the genera Bachmannocena, Dictyocha, Distephanopsis, Paramesocena and Stephanocha. This study records the first evidence of Tortonian silicoflagellates from the offshore of northeast Indian Ocean. Two Partial Range zones namely Dictyocha varia, and
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Seasonal Indonesian Throughflow (ITF) across southern Java determines genetic connectivity of Sardinella lemuru (Bleeker, 1835) Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-05-09 A. Sartimbul, V.A. Winata, R.D. Kasitowati, F. Iranawati, E. Rohadi, D. Yona, U.G. Anjeli, W.S. Pranowo, F.M. Lauro
Sardinella lemuru populations are considered near-threatened in Bali Strait. Despite declining fish stock, documented landings of S. lemuru at the Prigi waters unexpectedly climbed during the 2nd transitional inter-monsoon season of 2019. Here we used a combination of molecular taxonomy and morphometrics-meristics to determine the genetic link between S. lemuru populations in East Java's southern seas
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Causal relations between the loop current penetration and the inflow/outflow conditions inferred with a rigorous quantitative causality analysis Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-05-09 Yang Yang, Guanqi Fu, X. San Liang, Robert H. Weisberg, Yonggang Liu
The causal relationship between the Loop Current (LC) penetration into the Gulf of Mexico and the inflow/outflow conditions in the Yucatan Channel and the Straits of Florida is analyzed using a recently developed causality analysis, which is quantitative in nature, and rigorously derived from first principles. Long-term time series from a 23-year high-resolution reanalysis product reveals that the
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Carbon budgets of Scotia Sea mesopelagic zooplankton and micronekton communities during austral spring Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-05-09 Kathryn B. Cook, Anna Belcher, Daniel Bondyale Juez, Gabriele Stowasser, Sophie Fielding, Ryan A. Saunders, Mohamed A. Elsafi, George A. Wolff, Sabena J. Blackbird, Geraint A. Tarling, Daniel J. Mayor
Zooplankton form an integral component of epi- and mesopelagic ecosystems, and there is a need to better understand their role in ocean biogeochemistry. The export and remineralisation of particulate organic matter at depth plays an important role in controlling atmospheric CO2 concentrations. Pelagic mesozooplankton and micronekton communities may influence the fate of organic matter in a number of
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Effects of monsoons and storms on the structuring and diversity of picoeukaryotic microbial communities in a tropical coastal environment Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-04-25 Maria Anna Michaela De La Cruz, Brian William Hingpit, Laure Guillou, Deo Florence L. Onda
Picoeukaryotes are key components in marine ecosystems that play crucial roles in food webs and biogeochemical cycles. Despite their significance, many aspects of their community ecology and diversity remain understudied. Here, we investigated the taxonomic and functional diversity of picoeukaryotic communities in response to monsoonal patterns and weather disturbances brought about by storms, characterizing
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Cause and impact of Andaman Sea's salinity variability: A modeling study Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-04-26 Abhishek Pasula, Deepak N. Subramani
The Andaman Sea is an important and strategic region for India, both from a security and conservation viewpoint. Documenting the spatiotemporal variability of salinity is fundamental to understanding this region's dynamics. We studied the Andaman Sea's seasonal and inter-annual salinity variability during the Boreal summer (JJAS) using NEMO reanalysis data (1993–2018). Analysis of river influx, precipitation
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Trend of annual and semiannual harmonics of sea surface temperature in the tropical Indian Ocean, 1979–2018 Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-04-24 V.A. Abhishek, V. Vijith, N. Anup
In the Indian Ocean (IO), the annual and semiannual oscillations of the sea surface temperature (SST) contribute more than 80% of the total variance. It is known that the SST in the tropical IO has warmed at a rate of 0.15 °C/decade since 1979. However, such an estimate of the decadal trend of the annual and semiannual harmonics of SST remains unknown, despite being a strong component of the SST signal
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Atmospheric and advective forcing of upwelling on South Africa's central Agulhas Bank Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-04-24 Lisa Hancke, David Smeed, Mike Roberts, Cristina Russo, Darren Rayner, Fatma Jebri
Current and temperature structures on South Africa's central Agulhas Bank are described from six months of moored observations and ancillary data collected during the seasonal transition from austral spring to summer (October 2018–March 2019). The occurrence of an intermittend mid-shelf upwelling ridge, associated with increased productivity, is an important part of the shelf's thermal structure. However
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Seeps and vents of the Bering Sea Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-04-17 Vladimir V. Mordukhovich, Elena M. Krylova, Paul R. Dando
Abstract not available
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Record-breaking 2020 summer marine heatwaves in the western North Pacific Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-03-28 Yulong Yao, Chunzai Wang, Chao Wang
Record-breaking marine heatwaves (MHWs) occurred in the western North Pacific during the summer of 2020. These unprecedented MHWs were consistent with favorable large-scale conditions that are linked to an anomalous western North Pacific subtropical high (WNPSH), resulting mainly from sea surface temperature (SST) anomalies across the tropical oceans. In addition, a moderate La Niña-like pattern was
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Interannual variability of red sea overflow water pathways in the Western Arabian Sea in an eddy rich reanalysis Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-03-30 Viviane V. Menezes
The present study investigates the interannual variability of the advective pathways and transit times of the Red Sea Overflow Water (RSOW) in the western Arabian Sea using virtual particles as a proxy indicator for the poorly understood RSOW spreading. The Lagrangian simulations are based on the GLORYS12 eddy-rich reanalysis (1/12°), which assimilates most satellite and in situ observations from 1993
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Vertical imbalance in organic carbon budgets is indicative of a missing vertical transfer during a phytoplankton bloom near South Georgia (COMICS) Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-03-08 S.L.C. Giering, R. Sanders, S. Blackbird, N. Briggs, F. Carvalho, H. East, B. Espinola, S.A. Henson, K. Kiriakoulakis, M.H. Iversen, R.S. Lampitt, K. Pabortsava, C. Pebody, K. Peel, C. Preece, K. Saw, M. Villa-Alfageme, G.A. Wolff
The biological carbon pump, driven principally by the surface production of sinking organic matter and its subsequent remineralization to carbon dioxide (CO2) in the deep ocean, maintains atmospheric CO2 concentrations around 200 ppm lower than they would be if the ocean were abiotic. One important driver of the magnitude of this effect is the depth to which organic matter sinks before it is remineralised
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Forecasts of marine heatwaves for marine industries: Reducing risk, building resilience and enhancing management responses Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-03-05 Jason R. Hartog, Claire M. Spillman, Grant Smith, Alistair J. Hobday
Ocean use has always been risky because of uncertain and dramatic ocean conditions and modern businesses continue to experience risk due to environmental extremes. A changing physical environment due to anthropogenic climate change and increased frequency of extreme events such as marine heatwaves makes past experience less valuable. This risk can be reduced by utilising seasonal forecasts that provide
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Nonhydrostatic simulation of internal lee wave-induced turbulence mixing: A comparative study of second-moment closure mixing schemes for an idealized marginal sea sill topography Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-21 Shifan Wang, Lianxin Zhang, Xuefeng Zhang, Lei Lin, Xuhui Hu
To further understand the processes of wave-turbulence interactions under nonhydrostatic conditions and to gain insight into the selection of second-moment closure models in subsequent nonhydrostatic ocean models, a newly developed nonhydrostatic ocean model is coupled with the General Ocean Turbulence Model (GOTM) to form a robust version of the Marine Environment Research and Forecasting Model (MERF)
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A seasonal transition in biological carbon pump efficiency in the northern Scotia Sea, Southern Ocean Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-21 Stephanie A. Henson, Nathan Briggs, Filipa Carvalho, Clara Manno, Alexandre Mignot, Sandy Thomalla
The biological carbon pump (BCP) contributes to the oceanic CO2 sink by transferring particulate organic carbon (POC) into the deep ocean. The magnitude and efficiency of the BCP is likely to vary on timescales of days to seasons, however characterising this variability from shipboard observations is challenging. High resolution, sustained observations of primary production and particle fluxes by autonomous
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Surface ocean carbon budget in the 2017 south Georgia diatom bloom: Observations and validation of profiling biogeochemical argo floats Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-23 Aimee Coggins, Andrew J. Watson, Ute Schuster, Neill Mackay, Brian King, Elaine McDonagh, Alex J. Poulton
Estimates of the partial pressure of CO2 (pCO2) derived from biogeochemical Argo floats have the potential to improve our knowledge of the highly variable and partially observed Southern Ocean carbon sink through sampling at improved temporal and spatial resolution. Here we use the data from six biogeochemical Argo floats to characterise near-surface dissolved inorganic carbon (DIC) concentrations
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Phytoplankton dynamics, growth and microzooplankton grazing across the subtropical frontal zone, east of New Zealand Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-13 Karl A. Safi, Andrés Gutiérrez Rodríguez, Julie A. Hall, Matthew H. Pinkerton
Elevated but variable phytoplankton biomass and productivity is often associated with the subtropical front (STF) where nitrogen-limited subtropical and iron-limited subantarctic waters mix. To understand variability within the STF east of New Zealand, we assessed phytoplankton community structure, growth, and grazing dynamics in relation to physico-chemical conditions across 23 stations distributed
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Potential impact of predation by larval Spanish mackerel on larval anchovy in the central Seto Inland Sea, Japan Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-07 Wataru Deguchi, Tatsunori Fujita, Michio Yoneda, Naoaki Kono, Masayuki Yamamoto, Kaito Harada, Jun Shoji, Takeshi Tomiyama
Japanese anchovy is used as an essential dried fish material from the larval to adult stages. In the central Seto Inland Sea, Japan, the catch of larval anchovy has markedly decreased to <3.9% of the maximum recorded in 2002 since 2013; however, the reason causing this reduction has not been well understood. The abundance of recruit fish, including larvae and early juveniles, has decreased in the last
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Deep-learning model for sea surface temperature prediction near the Korean Peninsula Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-02-03 Hey-Min Choi, Min-Kyu Kim, Hyun Yang
Recently, sea surface temperatures (SSTs) near the Korean Peninsula have increased rapidly due to global warming; this phenomenon can lead to high water temperatures and extensive damage to Korean fish farms. To reduce such damage, it is necessary to predict high water temperature events in advance. In this study, we developed a method for predicting high water temperature events using time series
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New and known species of the genus Desmodora De Man, 1889 (Nematoda: Desmodoridae) from the hydrothermal vent communities of the Piip volcano (south-west Bering Sea) Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-26 V.V. Mordukhovich, N.P. Fadeeva, A.A. Semenchenko, S.I. Kiyashko, E.R. Scripova
Species of the marine nematode of the genus Desmodora have been found to dominate (up to 78%) in the nematode fauna from the hydrothermal vent communities of submarine Piip volcano, Bering Sea. The morphological characteristics and molecular genetic data of Desmodora specimens from different habitats of the volcano were studied and three new and one known species have been described: Desmodora hydrothermica
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An assessment of Ryukyu Archipelago's coral communities over a wide latitudinal range Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-26 Mariyam Shidha Afzal, Konomi Takeuchi, Akira Iguchi, Kazuhiko Sakai, Dio Dirgantara, Takashi Nakamura
Japan's coral reefs have changed dramatically over the last several decades due to climate change and anthropogenic impacts. Due to its dynamic location, the islands of Ryukyu Archipelago offer a unique environmental gradient to study the interactions between environmental variations, connectivity, resilience, climate change and adaptation of marine biodiversity along a wide latitudinal gradient. To
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Iron cycling during the decline of a South Georgia diatom bloom Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-20 Joanna Ainsworth, Alex J. Poulton, Maeve C. Lohan, Mark C. Stinchcombe, Alastair J.M. Lough, C. Mark Moore
The Southern Ocean is the largest high nutrient low chlorophyll (HNLC) oceanic region, where iron limits phytoplankton growth and productivity and ultimately influences the Biological Carbon Pump (BCP). Natural exceptions to the HNLC regime occur where island wakes cause iron to be mixed into surface waters from sediments, enabling large, prolonged phytoplankton blooms and increased carbon drawdown
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How do topography and thermal front influence the water transport from the northern Laotieshan Channel to the Bohai Sea interior in summer? Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-18 Yinfeng Xu, Feng Zhou, Qicheng Meng, Dingyong Zeng, Tao Yan, Wenyan Zhang
Water renewal through the Bohai Strait largely dominates the water quality of the semi-enclosed Bohai Sea (BS), which connects only to the northern Yellow Sea (NYS) through the strait. Although the peak water transport through the Bohai Strait occurs in summer, the spatially averaged water residence time of the BS shows no significant decrease compared to other periods. A three-dimensional model is
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Patterns in the plankton – Spatial distribution and long-term variability of copepods on the Agulhas Bank Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-18 Jenny A. Huggett, Margaux Noyon, Jacob Carstensen, David R. Walker
Copepods dominate the zooplankton community on the broad Agulhas Bank off southern Africa, where they provide an important food resource for pelagic fish and other biota. Previous studies have shown the dominant copepod Calanus agulhensis, which may comprise up to 80% of copepod biomass, to be strongly associated with the productive cold ridge of upwelled water on the central (CAB) and eastern (EAB)
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Diet of deep-sea holothurians in theVolcanologists Massif, Bering sea, as inferred from stable isotope and fatty acid analyses Deep Sea Res. Part II Top. Stud. Oceanogr. (IF 3.0) Pub Date : 2023-01-18 S.A. Rodkina, S.I. Kiyashko, V.V. Mordukhovich
Holothurians are one of the key components of the deep-sea megabenthos, often forming significant aggregations with high abundance and biomass. The crucial factors determining the pattern of their spatial distribution might be their food strategies, as well as the quantity and quality of available food. Using the set of trophic markers (analysis of fatty acid (FA) composition and stable nitrogen and