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Distinguishing Between Insolation-Driven and Phase-Locked 100-Kyr Ice Age Scenarios Using Example Models Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-18 Kirstin Koepnick, Eli Tziperman
Glacial-interglacial oscillations exhibit a periodicity of approximately 100 Kyr during the late Pleistocene. Insolation variations are understood to play a vital role in these ice ages, yet their exact effect is still unknown; the 100 Kyr ice ages may be explained in two different ways. They could be purely insolation-driven, such that ice ages are a consequence of insolation variations and would
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Pliocene Weakening of Gradients in Temperature but Not in Productivity in the Eastern Equatorial Pacific Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-16 K. M. Kimble, T. D. Herbert, C. A. Jones
The modern eastern equatorial Pacific Ocean (EEP) exhibits strong upwelling, producing pronounced gradients in sea surface temperature (SST), nutrient concentration, and biological productivity between 80° and 140°W. During the globally warmer late Pliocene (3.0–3.6 Ma), the EEP may have experienced permanent El Niño-like conditions, supported by a reduced SST gradient across the equatorial Pacific
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Strong Climate Control on the Millennial-Scale Dust Variability and Sediment Provenances in the Equatorial Indian Ocean Inferred From Sr-Nd Isotopes Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-08 Arvind Shukla, Sunil Kumar Singh, Dharmendra Pratap Singh, Aka Sharma, A. P. Dimri
High-resolution Sr and Nd isotope compositions along with major and trace element abundances have been analyzed in silicate fraction of sediments core, SSD004-GC03, from the Equatorial Indian Ocean (7.2°N and 77.9°E) at 1,540 m water depth with a depositional history of ∼38 ka to determine source variabilities and their controlling factors. 87Sr/86Sr (0.71978–0.72491), ƐNd (−14.8 to −21.9), and a couple
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Magnetic Fingerprints for the Paleoenvironmental Evolutions Since the Last Deglaciation: Evidence From the Northwestern South China Sea Sediments Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-08 Qishun Sun, Zhaoxia Jiang, Chunfeng Xiao, Long Chen, Wanxin Liu, Kuang He, Yulong Guan, Yuzhen Zhang, Haosen Wang, Liang Chen, Zhengxin Yin, Sanzhong Li
Rapid global changes since the last deglaciation can be well documented in marginal sea sediments, while isolating individual paleoenvironmental signals is still challenging. Here, we identified magnetic minerals and unmixed their variations in sediments from the northwestern South China Sea to decipher environmental variations since the last deglaciation. The variation in the hematite to goethite
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Rock Magnetic-Based Cyclic Expression in Late Visean Ramp Carbonates and an Astrochronology for the Late Asbian From Northwest England Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-05 Mark W. Hounslow, Pedro Cózar, Ian D. Somerville, Andrew J. Biggin
The late Asbian appears to mark the initial, well-documented, onset of far-field glacio-eustatic changes in equatorial Mississippian strata. This work unravels the nature of cyclicity in upper Asbian shallow marine carbonates, using a combination of petrographic study, rock magnetic proxies and astrochronological testing on samples from the Trowbarrow section, NW England. Rock magnetic data express
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Earth System Model Analysis of How Astronomical Forcing Is Imprinted Onto the Marine Geological Record: The Role of the Inorganic (Carbonate) Carbon Cycle and Feedbacks Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-04 P. Vervoort, S. Kirtland Turner, F. Rochholz, A. Ridgwell
Astronomical cycles are strongly expressed in marine geological records, providing important insights into Earth system dynamics and an invaluable means of constructing age models. However, how various astronomical periods are filtered by the Earth system and the mechanisms by which carbon reservoirs and climate components respond, particularly in absence of dynamic ice sheets, is unclear. Using an
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Seismic Stratigraphy of Contourite Drift Deposits Associated With the Loop Current on the Eastern Campeche Bank, Gulf of Mexico Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-03-03 Christopher M. Lowery, Ligia Perez Cruz, Jaime Urrutia Fucugauchi, Jingxuan Wei, James A. Austin, Patricia Standring
The Loop Current is a key component of global circulation via the northward transport of warm, salty water, and an important influence on Gulf of Mexico hydrography. Understanding how the Loop Current will respond to ongoing anthropogenic warming is critically important, but the history of the Loop Current is poorly known. Here, we present the results of a high resolution (3–8 m) multichannel seismic
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Climate Variability and Glacier Dynamics Linked to Fjord Productivity Changes Over the Last ca. 3300 Years in Nuup Kangerlua, Southwest Greenland Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-29 M. Oksman, A. B. Kvorning, C. Pearce, N. J. Korsgaard, J. M. Lea, M.-S. Seidenkrantz, S. Ribeiro
Greenlandic fjords, located between the ice sheet and the ocean, are dynamic systems that can sustain highly variable levels of primary productivity and are sensitive to climate change. In our current climate trajectory, meltwater discharge is expected to significantly increase but its long-term effects on fjord productivity are still poorly constrained. Paleo-archives can offer valuable insights into
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-29
No abstract is available for this article.
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20th Century Warming in the Western Florida Keys Was Dominated by Increasing Winter Temperatures Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-23 Jennifer A. Flannery, Julie N. Richey, Lauren T. Toth, Madelyn J. Mette
Long-lived Atlantic coral species like Orbicella faveolata are important archives of oceanographic change in shallow, marine environments like the Florida Keys. Not only can coral-based records extend for multiple centuries beyond the limits of the instrumental record, but they can also provide a more accurate representation of in situ conditions than gridded interpolated sea-surface temperature (SST)
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Climate and Vegetation of the Miocene of Tierra del Fuego: Filaret Formation Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-23 C. A. Sandoval, A. Yabe, H. Nishida, L. F. Hinojosa
The changing climate during the Cenozoic affected the diversity of plants in Patagonia, as species richness tends to increase during warm periods and decrease during cold periods. Precipitation is a significant factor shaping diversity, as shown in the case of central Chile during the Miocene. This study presents a reconstruction of the climate and vegetation in Tierra del Fuego Island, located approximately
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Transient Response of Southern Ocean Ecosystems During Heinrich Stadials Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-21 Himadri Saini, Katrin J. Meissner, Laurie Menviel, Karin Kvale
Antarctic ice core records suggest that atmospheric CO2 increased by 15–20 ppm during Heinrich stadials (HS). These periods of abrupt CO2 increase are associated with a significant weakening of the Atlantic meridional overturning circulation (AMOC), and a warming at high southern latitudes. As such, modeling studies have explored the link between changes in AMOC, high southern latitude climate and
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Calcareous Nannofossils and Paleoclimatic Evolution Across the Eocene-Oligocene Transition at IODP Site U1509, Tasman Sea, Southwest Pacific Ocean Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-17 A. Viganò, E. Dallanave, L. Alegret, T. Westerhold, R. Sutherland, G. R. Dickens, C. Newsam, C. Agnini
The Eocene-Oligocene transition (EOT; ∼34 Ma) was one of the most prominent global cooling events of the Cenozoic, coincident with the emergence of continental-scale ice-sheets on Antarctica. Calcareous nannoplankton experienced significant assemblage turnover at a time of long-term surface ocean cooling and trophic conditions, suggesting cause-effect relationships between Antarctic glaciation, broader
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Last Deglacial Environmental Change in the Tropical South Pacific From Tahiti Corals Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-02-19 Oliver Knebel, Thomas Felis, Ryuji Asami, Pierre Deschamps, Martin Kölling, Denis Scholz
On glacial-interglacial time scales, changes in the Earth's orbital configuration control climate seasonality and mean conditions. Tropical coral skeletons can be sampled at a sufficient resolution to reconstruct past seasonality. Here, last deglacial Porites skeletons from Integrated Ocean Drilling Program Expedition 310 to Tahiti are investigated and, supported by a modern calibration, monthly resolved
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Spatial and Temporal Patterns in Petrogenic Organic Carbon Mobilization During the Paleocene-Eocene Thermal Maximum Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-31 E. H. Hollingsworth, F. J. Elling, M. P. S. Badger, R. D. Pancost, A. J. Dickson, R. L. Rees-Owen, N. M. Papadomanolaki, A. Pearson, A. Sluijs, K. H. Freeman, A. A. Baczynski, G. L. Foster, J. H. Whiteside, G. N. Inglis
The Paleocene-Eocene Thermal Maximum (PETM) was a transient global warming event and is recognized in the geologic record by a prolonged negative carbon isotope excursion (CIE). The onset of the CIE was due to a rapid influx of 13C-depleted carbon into the ocean-atmosphere system. However, the mechanisms required to sustain the negative CIE remains unclear. Enhanced mobilization and oxidation of petrogenic
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-30
No abstract is available for this article.
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Ocean Oxygen, Preformed Nutrients, and the Cause of the Lower Carbon Dioxide Concentration in the Atmosphere of the Last Glacial Maximum Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-23 Daniel M. Sigman, Mathis P. Hain
All else equal, if the ocean's “biological [carbon] pump” strengthens, the dissolved oxygen (O2) content of the ocean interior declines. Confidence is now high that the ocean interior as a whole contained less oxygen during the ice ages. This is strong evidence that the ocean's biological pump stored more carbon in the ocean interior during the ice ages, providing the core of an explanation for the
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Multi-Proxy Evidence for Atlantic Meridional Overturning Circulation (AMOC) Weakening During Deglaciations of the Past 150,000 Years Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-15 Monica Garity, David Lund
Despite decades of research, the cause of deglaciations is not fully understood, leaving a critical gap in our understanding of Earth's climate system. During the most recent deglaciation (Termination I (T I)), abrupt declines in the stable carbon isotope ratio (δ13C) of benthic foraminifera occurred throughout the mid-depth (1,500–2,500 m) Atlantic. The spatial pattern in δ13C anomalies was likely
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Brazil Margin Stable Isotope Profiles for the Last Glacial Cycle: Implications for Watermass Geometry and Oceanic Carbon Storage Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-12 A. B. Shub, D. C. Lund, D. W. Oppo, M. L. Garity
Vertical profiles of benthic foraminiferal oxygen and carbon isotopes (δ18O and δ13C) imply the volume of southern source water (SSW) in the Atlantic basin expanded during the Last Glacial Maximum. Shoaling of the boundary between SSW and northern source water (NSW) may reduce mixing between the two watermasses, thereby isolating SSW and enhancing its ability to store carbon during glacial intervals
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Atmospheric CO2 Estimates for the Late Oligocene and Early Miocene Using Multi-Species Cross-Calibrations of Boron Isotopes Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-09 Lloyd B. Anderson, Bärbel Hönisch, Helen K. Coxall, Louise Bolge
The boron isotope (δ11B) proxy for seawater pH is a tried and tested means to reconstruct atmospheric CO2 in the geologic past, but uncertainty remains over how to treat species-specific calibrations that link foraminiferal δ11B to pH estimates prior to 22 My. In addition, no δ11B-based reconstructions of atmospheric CO2 exist for wide swaths of the Oligocene (33–23 Ma), and large variability in CO2
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Summer and Autumn Insolation as the Pacemaker of Surface Wind and Precipitation Dynamics Over Tropical Indian Ocean During the Holocene: Insights From Paleoproductivity Records and Paleoclimate Simulations Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-05 Xinquan Zhou, Stéphanie Duchamp-Alphonse, Franck Bassinot, Chuanlian Liu
Insolation is the engine of monsoon and Walker circulations over the tropical Indian Ocean. Here, we present Holocene coccolith-related net primary productivity (NPP) signals from two sediment cores retrieved in the wind-driven coastal upwelling systems off southern India and southern Sumatra. Upwelling-induced NPP is enhanced during summer and autumn and is a powerful tool to reconstruct atmospheric
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Biomarker Evidence for an MIS M2 Glacial-Pluvial in the Mojave Desert Before Warming and Drying in the Late Pliocene Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-06 Mark D. Peaple, Tripti Bhattacharya, Jessica E. Tierney, Jeffrey R. Knott, Tim K. Lowenstein, Sarah J. Feakins
Ancient lake deposits in the Mojave Desert indicate that the water cycle in this currently dry place was radically different under past climates. Here we revisit a 700 m core drilled 55 years ago from Searles Valley, California, that recovered evidence for a lacustrine phase during the late Pliocene. We update the paleomagnetic age model and extract new biomarker evidence for climatic conditions from
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Detecting Paleoclimate Transitions With Laplacian Eigenmaps of Recurrence Matrices (LERM) Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-02 Alexander James, Julien Emile-Geay, Nishant Malik, Deborah Khider
Paleoclimate records can be considered low-dimensional projections of the climate system that generated them. Understanding what these projections tell us about past climates, and changes in their dynamics, is a main goal of time series analysis on such records. Laplacian eigenmaps of recurrence matrices (LERM) is a novel technique using univariate paleoclimate time series data to indicate when notable
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Ballasting of Particulate Organic Matter at the Ninetyeast Ridge During the Mid-Brunhes Dissolution Interval and Long-Term Implications for Zonal Change in Tropical Indian Oceanography Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2024-01-02 Hiroyuki Takata, Boo-Keun Khim, Kiseong Hyeong, Inah Seo, Youngsook Huh, Hirofumi Asahi, Jongmin Lee, Koji Seto
We investigated benthic foraminifera in cores GPC03 and GPC04 in the northeast tropical Indian Ocean (TIO) over the past ∼450 ka to evaluate the ballasting effect of particulate organic matter (POM) and the long-term zonal change during the mid-Brunhes dissolution interval (MBDI). Today, interannual climate and oceanographic variability in the TIO is governed by the Indian Ocean Dipole (IOD), which
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-29
No abstract is available for this article.
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A Model-Data Comparison of the Hydrological Response to Miocene Warmth: Leveraging the MioMIP1 Opportunistic Multi-Model Ensemble Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-29 R. P. Acosta, N. J. Burls, M. J. Pound, C. D. Bradshaw, A. M. De Boer, N. Herold, M. Huber, X. Liu, Y. Donnadieu, A. Farnsworth, A. Frigola, D. J. Lunt, A. S. von der Heydt, D. K. Hutchinson, G. Knorr, G. Lohmann, A. Marzocchi, M. Prange, A. C. Sarr, X. Li, Z. Zhang
The Miocene (23.03–5.33 Ma) is recognized as a period with close to modern-day paleogeography, yet a much warmer climate. With large uncertainties in future hydroclimate projections, Miocene conditions illustrate a potential future analog for the Earth system. A recent opportunistic Miocene Model Intercomparison Project 1 (MioMIP1) focused on synthesizing published Miocene climate simulations and comparing
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Evolution of Oceanography of the Central Northwest Pacific Over the Past 10 Million Years With Focus on Late Miocene Global Cooling Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-22 Kenji M. Matsuzaki
Since the middle Miocene climatic transition, the Earth's climate has steadily cooled. The late Miocene global cooling (LMGC) and the Northern Hemisphere Glaciation (NHG) were two key cooling events occurring during this time. To better understand the mechanisms underlying these cooling events, changes in radiolarian microfossil assemblages were examined in this study, aiming at the reconstructing
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A Systematic Role for Extreme Ocean-Atmosphere Oscillations in the Development of Glacial Conditions Since the Mid Pleistocene Transition Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-20 Stephen Barker, Gregor Knorr
We introduce a new hypothesis concerning the role of internal climate dynamics in the non-linear transitions from interglacial to glacial (IG-G) state since the Mid Pleistocene Transition (MPT). These transitions encompass large and abrupt changes in atmospheric CO2, ice volume, and temperature that we suggest involve critical interactions between insolation and high amplitude oscillations in ocean/atmosphere
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High-Resolution, Multiproxy Speleothem Record of the 8.2 ka Event From Mainland Southeast Asia Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-13 Christopher T. Wood, Kathleen R. Johnson, Lindsey. E. Lewis, Kevin Wright, Jessica K. Wang, Andrea Borsato, Michael L. Griffiths, Andrew Mason, Gideon M. Henderson, Jacob B. Setera, Silvia Frisia, Sengphone Keophanhya, Joyce C. White
The 8.2 ka event is the most significant global climate anomaly of the Holocene epoch, but a lack of records from Mainland Southeast Asia (MSEA) currently limits our understanding of the spatial and temporal extent of the climate response. A newly developed speleothem record from Tham Doun Mai Cave, Northern Laos provides the first high-resolution record of this event in MSEA. Our multiproxy record
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A Warming Southern Gulf of Mexico: Reconstruction of Anthropogenic Environmental Changes From a Siderastrea siderea Coral on the Northern Coast of Cuba Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-12 M. Harbott, H. C. Wu, H. Kuhnert, C. Jimenez, P. González-Díaz, T. Rixen
The Gulf of Mexico is a vital region for the Atlantic Meridional Overturning Circulation (AMOC), that fuels the exchange of heat between the tropics and the polar regions. A weakening of the AMOC would have dire consequences for the planet. First observations and ocean models show that this process has already started. Very limited knowledge of the components that are part of the AMOC such as the Loop
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Astronomically-Paced Changes in Paleoproductivity, Winnowing, and Mineral Flux Over Broken Ridge (Indian Ocean) Since the Early Miocene Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-12 J. Lyu, G. Auer, O. M. Bialik, B. Christensen, R. Yamaoka, D. De Vleeschouwer
A significant shift in Earth's climate characterizes the Neogene, transitioning from a single-ice-sheet planet to the current bipolar configuration. This climate evolution is closely linked to changing ocean currents, but globally-distributed continuous high-resolution sedimentary records are needed to fully capture this interaction. The Ocean Drilling Program (ODP) Site 752, located on Broken Ridge
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Palynofloral Change Through the Paleocene-Eocene Thermal Maximum in the Bighorn Basin, Wyoming Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-09 Vera A. Korasidis, Scott L. Wing
To better understand the effect of the Paleocene-Eocene Thermal Maximum (PETM) on continental ecosystems, we studied 40 new palynological samples from the Bighorn Basin (BHB), northwestern Wyoming, USA. We see palm and fern abundances increase in the last 20–40 ka of the Paleocene, then dramatically with the onset of the carbon isotope excursion (CIE) defining the base of the PETM. Palynomorphs of
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Pacific-Driven Salinity Variability in the Timor Passage Since 1777 Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-01 Elizabeth W. Patterson, Julia E. Cole, Kelsey A. Dyez, Lael Vetter, Janice Lough
Salinity in the Indonesian seas integrates regional oceanographic and atmospheric processes, such as Indonesian Throughflow (ITF) and monsoon rainfall. Here we present a multicentury (1777–1983) δ18O coral record from Nightcliff Reef, located in the Timor Passage off the coast of northern Australia, which we use to infer local salinity change. We show that Australian monsoon rainfall and ITF influence
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Response of Siliceous Marine Organisms to the Permian-Triassic Climate Crisis Based on New Findings From Central Spitsbergen, Svalbard Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-12-01 W. J. Foster, G. Asatryan, S. Rauzi, J. P. Botting, S. Z. Buchwald, D. B. Lazarus, T. Isson, J. Renaudie, W. Kiessling
Siliceous marine ecosystems play a critical role in shaping the Earth's climate system by influencing rates of organic carbon burial and marine authigenic clay formation (i.e., reverse weathering). The ecological demise of silicifying organisms associated with the Permian-Triassic mass extinction is postulated to have elevated marine authigenic clay formation rates, resulting in a prolonged greenhouse
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High-Latitude, Indian Ocean, and Orbital Influences on Eastern African Hydroclimate Across the Plio-Pleistocene Boundary Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-30 Bryce A. Mitsunaga, Rachel L. Lupien, Samantha Ouertani, Brandon Stubbs, Alan L. Deino, John D. Kingston, Mona Stockhecke, Erik T. Brown, James M. Russell
Terrestrial-marine dust fluxes, pedogenic carbonate δ13C values, and various paleovegetation proxies suggest that Africa experienced gradual cooling and drying across the Pliocene-Pleistocene (Plio-Pleistocene) boundary (2.58 million years ago [Ma]). However, the timing, magnitude, resolution, and relative influences of orbitally-driven changes in high latitude glaciations and low latitude insolation
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Milankovitch Record From Middle Jurassic Platform Supports Moderate Coolhouse Glaciation Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-30 A. Husinec, J. F. Read
There are few documentations of far-field effects of coolhouse glaciation and its signature preserved within Middle Jurassic carbonate platforms. Through outcrop logging and time series analysis we document the cyclostratigraphy of the upper Bajocian-Bathonian interval of the Adriatic Platform, Croatia. The 200 m thick, ∼3.3 Myr duration cyclic platform record consists of peritidal carbonate parasequences
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-29
No abstract is available for this article.
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Enhanced CO2 Degassing From the Tropical Indian Ocean During Cold Climatic Events of the Last Glacial Cycle Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-29 Mohd Tarique, Waliur Rahaman, N. Lathika, Priyesh Prabhat, Meloth Thamban, Sambuddha Misra
Atmospheric CO2 variability on the glacial–interglacial (G–IG) timescale reflects a balance between oceanic and terrestrial processes involving carbon uptake and release. The Southern Ocean CO2 uptake is considered as an important modulator for the G–IG atmospheric CO2 variability, while the role of tropical ocean ventilation remains enigmatic. We present critical evidence for CO2 ventilation from
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More Frequent Hurricane Passage Across the Bahamian Archipelago During the Little Ice Age Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-21 T. S. Winkler, P. J. van Hengstum, J. P. Donnelly, E. J. Wallace, N. A. Albury, N. D’Entremont, A. D. Hawkes, C. V. Maio, J. Roberts, R. M. Sullivan, J. D. Woodruff
The year 2020 Common Era (CE) experienced the highest number of named tropical cyclones in the Atlantic Ocean since 1850 CE, but the short instrumental record makes it challenging to assess if this level of activity is statistically meaningful. Here, we present two near-annually resolved hurricane reconstructions from sediment archived in two blue holes located only 300 m apart on the northern margin
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Fossil-Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-21 M. H. H. Bom, K. G. D. Kochhann, U. Heimhofer, M. A. L. Mota, R. M. Guerra, M. G. Simões, G. Krahl, V. Meirelles, D. Ceolin, F. Fürsich, F. H. O. Lima, G. Fauth, M. L. Assine
Fossils from the Araripe Basin (northeastern Brazil) are known for their remarkable preservation of vertebrates and invertebrates, even including soft tissues. They occur in carbonate concretions within organic carbon-rich strata assigned to the Romualdo Formation. Here we present integrated stable isotope, elemental and microfossil records from the Sítio Sobradinho outcrop, Araripe Basin, northeastern
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Luminescence Chronology of Reticulated Laterites in the Humid Subtropical Mountains of South China Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-21 Jianhui Jin, Junjie Qiu, Zhiyong Ling, Junjie Wei, Xinxin Zuo, Zhizhong Li, Chenyang Hou, Daiyu Xu
Laterite is a red weathering crust developed with various rocks and Quaternary loose sediments as its parent material in the tropics and subtropics regions of the world. Since the 1930s, researchers have believed that the fluvial reticulated laterite in southern China was influenced by the warm and humid climate of the Middle Pleistocene. In recent years, the remains of Paleolithic human activities
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Precipitation Oxygen Isotope Changes Over East Asia Driven by Sea Surface Conditions During the Last Glacial Maximum Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-14 Haimao Lan, Kei Yoshimura, Zhongfang Liu
The seasonal changes in East Asian monsoon precipitation during the Last Glacial Maximum (LGM, 23,000–19,000 years B.P.) and its isotopic expression remain ambiguous. This study investigates changes in the seasonal precipitation δ18O (δ18Op) over East Asia during the LGM relative to the preindustrial (PI) and the underlying mechanisms using an isotope-enabled atmospheric general circulation model.
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An Upper Pleistocene and Holocene Black Carbon-Related Fire Record From the SW Balkans Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-15 Luisa Wöstehoff, Arne Kappenberg, Eva Lehndorff, Bernd Wagner, Konstantinos Panagiotopoulos, Wulf Amelung
Lake sediments are unique archives of human environment interactions. Lake Prespa is one of the oldest lakes in Europe, lying in the southwestern Balkans and thus on a possible dispersal route of anatomically modern humans from Africa. In this study, we investigated the effects of climate, vegetation and human activity on fire over the last 92,000 years in this region. Sediment samples were taken from
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Late Pleistocene Evolution of Tides and Tidal Dissipation Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-09 S.-B. Wilmes, V. K. Pedersen, M. Schindelegger, J. A. M. Green
Studies of the Last Glacial Maximum (LGM; 26.5–19 ka) tides showed strong enhancements in open ocean tidal amplitudes and dissipation rates; however, changes prior to the LGM remain largely unexplored. Using two different ice sheet and sea level reconstructions, we explicitly simulate the evolution of the leading semi-diurnal and diurnal tidal constituents (M2, S2, K1, and O1) over the last glacial
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Astronomical Pacing of Middle Eocene Sea-Level Fluctuations: Inferences From Shallow-Water Carbonate Ramp Deposits Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-07 T. C. Brachert, C. Agnini, C. Gagnaison, J.-P. Gély, M. J. Henehan, T. Westerhold
Astrochronologically calibrated deep-sea records document the Cenozoic (66–0 Ma) global climatic cooling in great detail, but the magnitude of sea-level fluctuations of the middle Eocene Warmhouse state (47.8–37.7 Ma) and the ∼40.3 Ma warming event of the Middle Eocene Climatic Optimum (MECO) is not well constrained. Here, we present a sequence stratigraphic classification of a shallow marine mixed
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Zonal Indian Ocean Variability Drives Millennial-Scale Precipitation Changes in Northern Madagascar Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-07 Benjamin H. Tiger, Stephen Burns, Robin R. Dawson, Nick Scroxton, Laurie R. Godfrey, Lovasoa Ranivoharimanana, Peterson Faina, David McGee
The low latitude Indian Ocean is warming faster than other tropical basins, and its interannual climate variability is projected to become more extreme under future emissions scenarios with substantial impacts on developing Indian Ocean rim countries. Therefore, it has become increasingly important to understand the drivers of regional precipitation in a changing climate. Here we present a new speleothem
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-04
No abstract is available for this article.
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Estimating Plio-Pleistocene North African Monsoon Runoff Into the Mediterranean Sea and Temperature Impacts Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-11-04 D. Heslop, U. Amarathunga, E. J. Rohling
Sapropels are dark, organic-rich layers found in Mediterranean sediments that formed during periods of bottom water anoxia. While various mechanisms have been proposed to have caused anoxic conditions, a primary factor is considered to be water column stratification induced by freshwater runoff related to intensified North African monsoon precipitation during precession minima. Monsoon intensification
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Paleogene Paleohydrology of Ellesmere and Axel Heiberg Islands (Arctic Canada) From Palustrine Carbonates Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-10-14 Ashly B. Padgett, Ethan G. Hyland, Christopher K. West, Landon K. Burgener, David R. Greenwood, James F. Basinger
Ancient greenhouse periods are useful analogs for predicting effects of anthropogenic climate change on regional and global temperature and precipitation patterns. A paucity of terrestrial data from polar regions during warm episodes challenges our understanding of polar climate responses to natural/anthropogenic change and therefore our ability to predict future changes in precipitation. Ellesmere
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Geochemical Differences Between Alive, Uncrusted and Dead, Crusted Shells of Neogloboquadrina pachyderma: Implications for Paleoreconstruction Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-29 Brittany N. Hupp, Jennifer S. Fehrenbacher
Planktic foraminiferal-based trace element-calcium ratios (TE/Ca) are a cornerstone in paleoceanographic reconstructions. While TE-environment calibrations are often established through culturing experiments, shell growth in culture is not always consistent with growth in a natural setting. For example, many species of planktic foraminifera thicken their shell at the end of their life cycle, producing
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Revisiting Oxygen-18 and Clumped Isotopes in Planktic and Benthic Foraminifera Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-28 M. Daëron , W. R. Gray
Foraminiferal isotopes are widely used to study past oceans, with different species recording conditions at different depths. Their δ18O values record both seawater oxygen-18 and temperature according to species-specific fractionation factors, while their Δ47 signatures likely depend only on temperature. We describe an open-source framework to collect/combine data relevant to foraminiferal isotopes
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Issue Information Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-27
No abstract is available for this article.
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Capturing Equatorial Pacific Variability With Multivariate Sr-U Coral Thermometry Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-27 N. R. Mollica, A. L. Cohen, F. Horton, D. W. Oppo, A. S. Solow, D. McGee
Sr-U, a coral-based paleothermometer, corrects for the effects of Rayleigh Fractionation on Sr/Ca by regressing multiple, paired U/Ca and Sr/Ca values. Prior applications of Sr-U captured mean annual sea surface temperatures (SSTs), inter-annual variability, and long-term trends. However, because many Sr/Ca-U/Ca pairs are needed for a single Sr-U value as originally formulated, the temporal resolution
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Assessing Seasonal and Inter-Annual Marine Sediment Climate Proxy Data Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-25 Ed Hathorne, Andrew M. Dolman, Thomas Laepple
Three recently published papers including Napier et al. (2022, https://doi.org/10.1029/2021PA004355) utilize novel microanalytical approaches with varved marine sediments to demonstrate the potential to reconstruct seasonal and inter-annual climate variability. Obtaining paleoclimate data at a resolution akin to the observational record is vitally important for improving our understanding of climate
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Aridification of Northwest Australia and Nutrient Decline in the Timor Sea During the 40 Kyr World Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-15 Y. Zhang, T. Andrade, A. C. Ravelo, L. Gong, A. Holbourn, G. Connock, X. L. Liu, I. W. Aiello
Studying tropical hydroclimate and productivity change in the past is critical for understanding global climate dynamics. Northwest Australia is an ideal location for investigating Australian monsoon dynamics, the variability of the Indonesian Throughflow (ITF), and their impact on past productivity and Pacific warm pool evolution, which remain poorly understood during the 40 kyr world in the mid-early
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Calibrating Non-Thermal Effects on Planktic Foraminiferal Mg/Ca for Application Across the Cenozoic Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-14 Laura L. Haynes, Bärbel Hönisch, Kate Holland, Stephen Eggins, Yair Rosenthal
Foraminiferal Mg/Ca has proven to be a powerful paleothermometer for reconstructing past sea-surface temperature, which, among other applications, is a critical parameter for boron isotope reconstructions of past surface ocean pH and PCO2. However, recent laboratory culture studies indicate seawater pH and the total dissolved inorganic carbon content (DIC) may both exert a significant additional control
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40Ar/39Ar Age Constraints on MIS 5.5 and MIS 5.3 Paleo-Sea Levels: Implications for Global Sea Levels and Ice-Volume Estimates Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-04 F. Marra, F. Florindo, M. Gaeta, B. R. Jicha
We integrate 10 new with five published 40Ar/39Ar age determinations, both on primary volcanic deposits and on detrital sanidine, which provide precise geochronologic control on the Marine Isotope Stage (MIS) 5.5 and MIS 5.3 sea-level indicators that occur at three coastal caves in a tectonically stable region of the central Tyrrhenian Sea of Italy. The age of a Strombus-bearing bioclastic conglomerate
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The Effect of Seawater Carbonate Chemistry on the Stable Isotope Composition of Cibicidoides wuellerstorfi and Other Cibicidoides Species Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-07 Alexandra J. Nederbragt
The δ13C composition of Cibicidoides wuellerstorfi and other Cibicidoides spp is an important tool to reconstruct past changes in the deep ocean carbon cycle. The species are expected to match the δ13C of ambient dissolved inorganic carbon (DIC), although it has been recognized that substantial offsets can occur. Here, I present a compilation of modern δ13C and δ18O data for named Cibicidoides species
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Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-02 Henriette Kolling, Ralph Schneider, Felix Gross, Christian Hamann, Markus Kienast, Stephanie Kienast, Kristin Doering, Kirsten Fahl, Ruediger Stein
The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warming and further melting of the Greenland ice cap. However, while the final disappearance of the LIS during the Holocene is rather well constrained, the response of
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Heat Transport Processes of the Indonesian Throughflow Along the Outflow Pathway in the Eastern Indian Ocean During the Last 160 Kyr Paleoceanogr. Paleoclimatol. (IF 3.5) Pub Date : 2023-09-01 Xuan Ding, Franck Bassinot, Xiaolei Pang, Yingxin Kou, Liping Zhou
As the only low-latitude connection along the return branch of the Great Conveyor Belt, the Indonesian Throughflow (ITF) plays an important role in the large-scale ocean–atmosphere interaction in the tropical region. However, the heat transport processes of the ITF along the outflow pathway in the eastern Indian Ocean over the recent geologic period is still debated. In this study, by using Mg/Ca ratios