scholarly journals Millennial-scale climate change and intermediate water circulation in the Bering Sea from 90 ka: A high-resolution record from IODP Site U1340

2013 ◽  
Vol 28 (1) ◽  
pp. 54-67 ◽  
Author(s):  
Shiloh A. Schlung ◽  
A. Christina Ravelo ◽  
Ivano W. Aiello ◽  
Dyke H. Andreasen ◽  
Mea S. Cook ◽  
...  
Keyword(s):  
Climate Change ◽  
High Resolution ◽  
Bering Sea ◽  
Water Circulation ◽  
Intermediate Water ◽  
The Bering Sea ◽  
Site U1340 ◽  
Millennial Scale

Stable Isotope and Lithologic Evidence of Late-Glacial and Holocene Oceanography of the Northwestern Pacific and Its Marginal Seas

1996 ◽  
Vol 46 (3) ◽  
pp. 230-250 ◽  
Author(s):  
Sergei A. Gorbarenko
Keyword(s):  
Bering Sea ◽  
Planktonic Foraminifera ◽  
Late Glacial ◽  
Northwestern Pacific ◽  
Intermediate Water ◽  
Regional Environment ◽  
The Holocene ◽  
Marginal Seas ◽  
The North ◽  
The Bering Sea

Stable isotopes, geochemical, lithological, and micropaleontological results from cores from the far northwest (FNW) Pacific and the Okhotsk and Bering seas are used to reconstruct the regional environment for the last glaciation, the deglacial transition, and the Holocene. δ18O records of planktonic foraminifera of the region show two “light” shifts during deglacial time, provoked by the freshening of the surface water and climate warming. These north Pacific terminal events (T1ANP and T1BNP) with ages of 12,500 and 9300 yr B.P., respectively, occur almost simultaneously with two episodes of accelerated glacier melting around the North Atlantic. Along with the isotopic shifts, the CaCO3 content in regional sediments increased abruptly (1A and 1B carbonate peaks), probably due to changes of productivity and pore water chemistry of surface sediments. Organic matter and opal concentration increased during the transition (between T1ANP and T1BNP events) in the sediments of the FNW Pacific and the southern part of the Bering Sea and opal content increased in the Holocene in the Bering and Okhotsk Seas. δ13C records of cores from the Okhotsk and Bering seas and the FNW Pacific do not contradict the hypothesis of increased intermediate water formation in the region during glaciation. During deglaciation, accumulation of the coarse terrigenous component decreased in sediments of the Bering Sea and the FNW Pacific before the T1ANP event, probably as a result of rising sea level and opening of the Bering Strait.

Clay mineral assemblages at IODP Site U1340 in the Bering Sea and their paleoclimatic significance

2015 ◽  
Vol 58 (5) ◽  
pp. 707-717 ◽  
Author(s):  
Qiang Zhang ◽  
MuHong Chen ◽  
JianGuo Liu ◽  
ZhaoJie Yu ◽  
LanLan Zhang ◽  
...  
Keyword(s):  
Clay Mineral ◽  
Bering Sea ◽  
Mineral Assemblages ◽  
Paleoclimatic Significance ◽  
The Bering Sea ◽  
Site U1340

Evidence for a substantial increase in gelatinous zooplankton in the Bering Sea, with possible links to climate change

1999 ◽  
Vol 8 (4) ◽  
pp. 296-306 ◽  
Author(s):  
Richard D. Brodeur ◽  
Claudia E. Mills ◽  
James E. Overland ◽  
Gary E. Walters ◽  
James D. Schumacher
Keyword(s):  
Climate Change ◽  
Bering Sea ◽  
Gelatinous Zooplankton ◽  
The Bering Sea

scholarly journals Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period

2021 ◽  
Vol 9 ◽  
Author(s):  
Ekaterina Ovsepyan ◽  
Elena Ivanova ◽  
Martin Tetard ◽  
Lars Max ◽  
Ralf Tiedemann
Keyword(s):  
Sea Level ◽  
Deep Water ◽  
Bering Sea ◽  
North Pacific ◽  
Intermediate Water ◽  
Western Bering Sea ◽  
Water Oxygen ◽  
Wide Range ◽  
The Bering Sea ◽  
Oxygen Concentrations

Deglacial dissolved oxygen concentrations were semiquantitatively estimated for intermediate and deep waters in the western Bering Sea using the benthic foraminiferal-based transfer function developed by Tetard et al. (2017), Tetard et al. (2021a). Benthic foraminiferal assemblages were analyzed from two sediment cores, SO201-2-85KL (963 m below sea level (mbsl), the intermediate-water core) and SO201-2-77KL (2,163 mbsl, the deep-water core), collected from the Shirshov Ridge in the western Bering Sea. Intermediate waters were characterized by an oxygen content of ∼2.0 ml L−1 or more during the Last Glacial Maximum (LGM)–Heinrich 1 (H1), around 0.15 ml L−1 during the middle Bølling/Allerød (B/A)–Early Holocene (EH), and a slight increase in [O2] (∼0.20 ml L−1) at the beginning of the Younger Dryas (YD) mbsl. Deep-water oxygen concentrations ranged from 0.9 to 2.5 ml L−1 during the LGM–H1, hovered around 0.08 ml L−1 at the onset of B/A, and were within the 0.30–0.85 ml L−1 range from the middle B/A to the first half of YD and the 1.0–1.7 ml L−1 range from the middle to late Holocene. The [O2] variations remind the δ18O NGRIP record thereby providing evidence for a link between the Bering Sea oxygenation at intermediate depths and the deglacial North Atlantic climate. Changes in the deep-water oxygen concentrations mostly resemble the deglacial dynamics of the Southern Ocean upwelling intensity which is supposed to be closely coupled with the Antarctic climate variability. This coherence suggests that deglacial deep-water [O2] variations were primarily controlled by changes in the circulation of southern-sourced waters. Nevertheless, the signal from the south at the deeper site might be amplified by the Northern Hemisphere climate warming via an increase in sea-surface bioproductivity during the B/A and EH. A semi-enclosed position of the Bering Sea and sea-level oscillations might significantly contribute to the magnitude of oxygenation changes in the study area during the last deglaciation. Interregional correlation of different proxy data from a wide range of water depths indicates that deglacial oxygenation changes were more pronounced in the Bering and Okhotsk marginal seas than along the open-ocean continental margin and abyssal settings of the North Pacific.

scholarly journals The deglacial history of surface and intermediate water of the Bering Sea

2005 ◽  
Vol 52 (16-18) ◽  
pp. 2163-2173 ◽  
Author(s):  
Mea S. Cook ◽  
Lloyd D. Keigwin ◽  
Constance A. Sancetta
Keyword(s):  
Bering Sea ◽  
Intermediate Water ◽  
History Of ◽  
The Bering Sea

Climatic and economic drivers of the Bering Sea walleye pollock (Theragra chalcogramma) fishery: implications for the future

2013 ◽  
Vol 70 (6) ◽  
pp. 841-853 ◽  
Author(s):  
Alan C. Haynie ◽  
Lisa Pfeiffer
Keyword(s):  
Climate Change ◽  
Bering Sea ◽  
Climate Models ◽  
Walleye Pollock ◽  
Spatial And Temporal Variation ◽  
Theragra Chalcogramma ◽  
Climate Change Scenarios ◽  
Walleye Pollock Theragra Chalcogramma ◽  
The Impact ◽  
The Bering Sea

This paper illustrates how climate, management, and economic drivers of a fishery interact to affect fishing. Retrospective data from the Bering Sea walleye pollock (Theragra chalcogramma) catcher–processer fishery were used to model the impact of climate on spatial and temporal variation in catch and fishing locations and make inferences about harvester behavior in a warmer climate. Models based on Intergovernmental Panel on Climate Change scenarios predict a 40% decrease in sea ice by 2050, resulting in warmer Bering Sea temperatures. We find that differences in the value of catch result in disparate behavior between winter and summer seasons. In winter, warm temperatures and high abundances drive intensive effort early in the season to harvest earlier-maturing roe. In summer, warmer ocean temperatures were associated with lower catch rates and approximately 4% less fishing in the northern fishing grounds, contrary to expectations derived from climate-envelope-type models that suggest fisheries will follow fish poleward. Production-related spatial price differences affected the effort distribution by a similar magnitude. However, warm, low-abundance years have not been historically observed, increasing uncertainty about future fishing conditions. Overall, annual variation in ocean temperatures and economic factors has thus far been more significant than long-term climate change-related shifts in the fishery's distribution of effort.

scholarly journals On the Robustness of Emergent Constraints Used in Multimodel Climate Change Projections of Arctic Warming

2012 ◽  
Vol 26 (2) ◽  
pp. 669-678 ◽  
Author(s):  
Thomas J. Bracegirdle ◽  
David B. Stephenson
Keyword(s):  
Climate Change ◽  
Bering Sea ◽  
Climate Model ◽  
Grid Point ◽  
Temperature Response ◽  
Surface Air Temperature ◽  
Arctic Warming ◽  
Polar Amplification ◽  
Emergent Constraints ◽  
The Bering Sea

Abstract Statistical relationships between future and historical model runs in multimodel ensembles (MMEs) are increasingly exploited to make more constrained projections of climate change. However, such emergent constraints may be spurious and can arise because of shared (common) errors in a particular MME or because of overly influential models. This study assesses the robustness of emergent constraints used for Arctic warming by comparison of such constraints in ensembles generated by the two most recent Coupled Model Intercomparison Project (CMIP) experiments: CMIP3 and CMIP5. An ensemble regression approach is used to estimate emergent constraints in Arctic wintertime surface air temperature change over the twenty-first century under the Special Report on Emission Scenarios (SRES) A1B scenario in CMIP3 and the Representative Concentration Pathway (RCP) 4.5 scenario in CMIP5. To take account of different scenarios, this study focuses on polar amplification by using temperature responses at each grid point that are scaled by the global mean temperature response for each climate model. In most locations, the estimated emergent constraints are reassuringly similar in CMIP3 and CMIP5 and differences could have easily arisen from sampling variation. However, there is some indication that the emergent constraint and polar amplification is substantially larger in CMIP5 over the Sea of Okhotsk and the Bering Sea. Residual diagnostics identify one climate model in CMIP5 that has a notable influence on estimated emergent constraints over the Bering Sea and one in CMIP3 that that has a notable influence more widely along the sea ice edge and into midlatitudes over the western North Atlantic.

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