Article
Geosciences, Multidisciplinary
Yuhao Dai, Jimin Yu, Patrick Rafter
Summary: The study reveals changes in the carbon storage in the deep Southern Ocean during specific periods of the Last Glacial Maximum, highlighting the impacts of sea-ice and stratification between Upper and Lower Circumpolar Deep Waters.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Environmental Sciences
Yanguang Liu, Yue Qiu, Dongling Li, Antonina V. Artemova, Yuying Zhang, Aleksandr A. Bosin, Sergey A. Gorbarenko, Qingsong Liu, Debo Zhao, Longbin Sha, Yi Zhong
Summary: This study investigates changes in sea-ice coverage, biological productivity, and sea surface temperature in the subarctic Pacific Ocean since 32 kyr. It reveals an enhanced North Pacific surface water stratification during the last glacial period, which limited the siliceous productivity supply. The increase in atmospheric pCO(2) and nutrient- and CO2-rich waters led to a productivity peak during the Bolling/Allerod warm interval. The northward shift of the westerly winds and the gyre boundary likely caused changes in heat transport, biogeochemistry, and hydroclimate in the North Pacific.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geology
J. L. Bernal-Wormull, A. Moreno, C. Perez-Mejias, M. Bartolome, A. Aranburu, M. Arriolabengoa, E. Iriarte, I. Cacho, C. Spoetl, R. L. Edwards, H. Cheng
Summary: The study indicates that major disruptions in the North Atlantic circulation during the last deglaciation triggered climate feedbacks that influenced the course of Termination I. By analyzing the stalagmite record from Ostolo cave in the northern Iberian Peninsula, researchers gained important insights into the structure of the last deglaciation in the Northern Hemisphere.
Article
Geosciences, Multidisciplinary
Ekaterina Ovsepyan, Elena Ivanova, Martin Tetard, Lars Max, Ralf Tiedemann
Summary: The study semi-quantitatively estimated the dissolved oxygen concentrations in the western Bering Sea during the deglaciation, revealing distinct changes in oxygen content in intermediate and deep waters during different periods. The variations in oxygen concentrations in the intermediate depths were linked to the North Atlantic climate, while those in the deep waters were associated with changes in the circulation of southern-sourced waters and amplified by Northern Hemisphere climate warming. The region of the Bering Sea and sea-level oscillations significantly contributed to the magnitude of oxygenation changes during the last deglaciation, with more pronounced changes observed in the Bering and Okhotsk marginal seas compared to the open-ocean continental margin and abyssal settings of the North Pacific.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Environmental Sciences
Omid Alizadeh, Morteza Babaei
Summary: This study examines the temperature and precipitation changes in Southwest Asia using the ERA5 and CRU datasets. The results show significant warming trends in the region, with notable differences between seasons and regions. In terms of precipitation, some areas experience significant decreases in winter while others see significant increases in spring.
Article
Geosciences, Multidisciplinary
Jacob Jones, Karen E. Kohfeld, Helen Bostock, Xavier Crosta, Melanie Liston, Gavin Dunbar, Zanna Chase, Amy Leventer, Harris Anderson, Geraldine Jacobsen
Summary: Limited data on past sea ice coverage has hindered our understanding of its impact on atmospheric CO2 concentration. This study provides new estimates of sea ice concentrations and sea surface temperatures using fossil diatom assemblages, and finds that sea ice expansion may have influenced intermediate ocean circulation changes.
CLIMATE OF THE PAST
(2022)
Article
Meteorology & Atmospheric Sciences
Krishneel K. Sharma, Andrew D. Magee, Danielle C. Verdon-Kidd
Summary: The study of tropical cyclone tracks in the southwest Pacific region over the past 70 years revealed significant temporal trends, with certain TC track clusters becoming less frequent while others increased. There was a notable decrease in TCs with straight and quasi-straight tracks over the last decade.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Nora Richter, James M. Russell, Johanna Garfinkel, Yongsong Huang
Summary: Temperature reconstructions in the Northern Hemisphere over the past 2000 years show a warming trend during the winter-spring seasons, contrary to the general cooling trend observed in most NH averages. This discrepancy may be attributed to seasonal biases in temperature proxies and inaccuracies in climate model predictions.
CLIMATE OF THE PAST
(2021)
Article
Environmental Sciences
Hye-Ryeom Kim, Kyung-Ja Ha, William K-M Lau
Summary: The Indo-Pacific warm pool (IPWP) is known for strong atmospheric convection and plays a key role in global climate. Recent human-induced warming has led to a non-linear relationship between sea surface temperature (SST) and precipitation in the IPWP. The saturation threshold SST (STT) indicates a distinct transition in the precipitation response to SST. The impact of warmer climates on the SST-precipitation relationship and STT remains uncertain.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Zizheng Guo, Joaquin Vicente Ferrer, Marcel Huerlimann, Vicente Medina, Carol Puig-Polo, Kunlong Yin, Da Huang
Summary: A study was conducted in Wanzhou County, southwest China to analyze future rainfall-induced shallow landslide susceptibility by considering land use and land cover changes and climate change. The study found that future rainfall conditions in the region will significantly change, and the negative impact of climate change on landslide susceptibility is greater than the stabilizing effect of land use change.
GEOSCIENCE FRONTIERS
(2023)
Article
Environmental Sciences
Rupsa Bhowmick, Jill C. Trepanier, Alex M. Haberlie
Summary: This study evaluates the ability of a random forest classifier to identify tropical cyclone intensification or weakening prior to landfall over the western region of the Southwest Pacific Ocean basin. The model uses geophysical and aerosol variables collected 24 hours before landfall to accurately classify the cyclones and identified longitude, initial intensity, and sea skin temperature as the most important variables for this classification.
Article
Multidisciplinary Sciences
Torben Struve, Jack Longman, Martin Zander, Frank Lamy, Gisela Winckler, Katharina Pahnke
Summary: The input of soluble micronutrients iron and manganese through mineral dust in the Southern Ocean can stimulate primary productivity and reduce atmospheric CO2 during glacial cycles. Changes in dust sources and transport pathways in the Southern Hemisphere over these cycles remain poorly understood. This study used geochemical fingerprinting and isotopic mixture modeling to identify changes in dust transport to the South Pacific Subantarctic Zone. Results showed that dust from South America dominated the region during glacial cycles, with increased contributions from Australia and New Zealand in later parts of the cycles. These changes in dust provenance corresponded with variations in grain size, indicating the influence of circumpolar transport by westerly winds.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Fisheries
Tayler M. Clarke, Colette C. C. Wabnitz, Thomas L. Frolicher, Gabriel Reygondeau, Daniel Pauly, William W. L. Cheung
Summary: Warming and oxygen limitation may alter fish community composition and impact fisheries catches. The vulnerability of catches to warming and the increasing frequency of marine heatwaves associated with climate change are major concerns.
FISH AND FISHERIES
(2022)
Article
Environmental Sciences
Defang You, Ruediger Stein, Kirsten Fahl, Maricel C. Williams, Daniela N. Schmidt, Ian Nicholas McCave, Stephen Barker, Enno Schefuss, Lu Niu, Gerhard Kuhn, Frank Niessen
Summary: According to sediment core biomarker proxy records from the Eirik Drift, freshwater perturbations during the last deglaciation drove abrupt changes in sea surface temperature and sea ice extent. Four millennial-scale meltwater events have been identified between the last 14,000 and 8,200 years, characterized by increased sea ice formation and decreased sea surface temperatures. These events were likely triggered by meltwater pulsing into the Labrador Sea periodically, resulting from collapse of the Laurentide-Greenland Ice Sheets caused by (sub-)surface ocean warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Jiepeng Chen, Jin-Yi Yu, Sheng Chen, Xin Wang, Ziniu Xiao, Shih-Wei Fang
Summary: Sea surface temperature anomalies play a key role in determining the decay pace and asymmetry of El Ninos (EN) and La Ninas (LN). LN decays more slowly than EN due to larger cold anomalies over subtropical and tropical regions. Future climate warming may reduce the magnitude differences between EN and LN, weakening the asymmetry of EN-LN decay.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
Mea S. Cook, A. Christina Ravelo, Alan Mix, Ian M. Nesbitt, Nari V. Miller
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2016)
Article
Geochemistry & Geophysics
Elisabeth L. Sikes, Aurora C. Elmore, Katherine A. Allen, Mea S. Cook, Thomas P. Guilderson
EARTH AND PLANETARY SCIENCE LETTERS
(2016)
Article
Chemistry, Multidisciplinary
Andrea J. Fassbender, Hilary I. Palevsky, Todd R. Martz, Anitra E. Ingalls, Martha Gledhill, Sarah E. Fawcett, Jay A. Brandes, Lihini I. Aluwihare
Article
Geosciences, Multidisciplinary
Elisabeth L. Sikes, Katherine A. Allen, David C. Lund
Article
Paleontology
R. Mitra, T. M. Marchitto, Q. Ge, B. Zhong, B. Kanakiya, M. S. Cook, J. S. Fehrenbacher, J. D. Ortiz, A. Tripati, E. Lobaton
MARINE MICROPALEONTOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Vincent J. Clementi, Elisabeth L. Sikes
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Elisabeth L. Sikes, Benedetto Schiraldi, Amanda Williams
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2019)
Article
Geosciences, Multidisciplinary
N. K. H. Yeung, L. Menviel, K. J. Meissner, E. Sikes
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Katherine A. Allen, Elisabeth L. Sikes, Robert F. Anderson, Yair Rosenthal
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Geochemistry & Geophysics
Timothy J. Heaton, Peter Koehler, Martin Butzin, Edouard Bard, Ron W. Reimer, William E. N. Austin, Christopher Bronk Ramsey, Pieter M. Grootes, Konrad A. Hughen, Bernd Kromer, Paula J. Reimer, Jess Adkins, Andrea Burke, Mea S. Cook, Jesper Olsen, Luke C. Skinner
Article
Geochemistry & Geophysics
Thomas J. Williams, Amy J. Wagner, Elisabeth L. Sikes, Ellen E. Martin
Summary: The study revealed a decrease in delta C-13(DIC) in the surface ocean of the Southeastern Indian Ocean over the last decade, primarily attributed to the uptake of anthropogenic CO2, with a significant impact observed in the Subantarctic Mode Water (SAMW). The research estimated that the annual storage of anthropogenic carbon in the SAMW of the southeastern Indian Ocean increased significantly between 2008 and 2018 compared to previous years.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geography, Physical
Thomas John Williams, Ellen E. Martin, Elisabeth Sikes, Aidan Starr, Natalie E. Umling, Ryan Glaubke
Summary: The study presents multiproxy data for paleocirculation changes in the deep Indian sector of the Southern Ocean over the past 118,000 years. It reveals a tight coupling between circulation changes, Antarctic climate, and atmospheric CO2 concentrations, even during the initial stages of glacial inception. Cooling periods correspond to reductions in North Atlantic-sourced waters entrainment and slower bottom water flow speeds, linked to Southern hemisphere control on paleocirculation changes.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
N. E. Umling, B. Saad, E. Sikes, N. F. Goodkin
Summary: The area density proxy of foraminiferal shell thickness and calcification intensity has the potential to provide valuable information about past ocean CO2 content, with considerations for diagenesis in shell preservation. Reconstructing the distribution of area density values in samples can estimate the percent of well-preserved shells and assess the suitability of marine sediment samples for surface ocean reconstructions.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Review
Environmental Sciences
Elisabeth L. Sikes, Natalie E. Umling, Katherine A. Allen, Ulysses S. Ninnemann, Rebecca S. Robinson, Joellen L. Russell, Thomas J. Williams
Summary: The Southern Ocean plays a crucial role in regulating global CO2 levels and was instrumental in reducing atmospheric CO2 during the Last Glacial Maximum (LGM) and driving the subsequent increase during the deglaciation. There is still ongoing debate regarding the relative importance of Northern and Southern Hemisphere forcing during deglacial events. This review compares modern Southern Ocean conditions with those during the LGM and deglacial period, identifying key factors that initiated the glacial termination. The dynamics of the Southern Ocean appear to have been significant in initiating the termination of the LGM.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Review
Environmental Sciences
Louise Newman, Petra Heil, Rowan Trebilco, Katsuro Katsumata, Andrew Constable, Esmee van Wijk, Karen Assmann, Joana Beja, Phillippa Bricher, Richard Colemans, Daniel Costa, Steve Diggs, Riccardo Farneti, Sarah Fawcett, Sarah T. Gille, Katharine R. Hendry, Sian Henley, Eileen Hofmann, Ted Maksym, Matthew MazIoff, Andrew Meijers, Michael M. Meredith, Sebastian Moreau, Burcu Ozsor, Robin Robertson, Irene Schloss, Oscar Schofield, Jiuxin Shi, Elisabeth Sikes, Inga J. Smith, Sebastiaan Swart, Anna Wahlin, Guy Williams, Michael J. M. Williams, Laura Herraiz-Borreguero, Stefan Kern, Jan Liesers, Robert A. Massom, Jessica Melbourne-Thomas, Patricia Miloslavich, Gunnar Spreen
FRONTIERS IN MARINE SCIENCE
(2019)