Sea surface temperature across the Subarctic North Pacific and marginal seas through the past 20,000 years: A paleoceanographic synthesis

Davis, Catherine V.; Myhre, Sarah E.; Deutsch, Curtis; Caissie, Beth; Praetorius, S. K.; Borreggine, M. J.; Thunell, Robert C.

doi:10.1016/j.quascirev.2020.106519

Cited by 10 publications

(8 citation statements)

References 109 publications

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“…Warming in Alaska and NW Canada is confirmed by paleolimnological proxy records, showing continuous summer warming through the ED, HS1, to B/A (Kurek et al, 2009;Fritz et al, 2012). In the Bering Sea and North Pacific, changes in sea-surface temperatures in detail revealed spatiotemporal heterogeneities, but with a trend towards warming during HS1 in the northwestern Pacific and the Bering Sea (Meyer et al, 2016;Davis et al, 2020;Praetorius et al, 2020). The evidence of late HS1 warming points to both insolation and greenhouse gas forcing of regional climate (Figure 4).…”

Section: Paleoenvironmental Implications and Outlookmentioning

confidence: 70%

“…As a focal area in the Meridional Overturning Circulation (MOC), the North Atlantic region since long has been identified as an important actor in the global climate system (Broecker et al, 1985;Clement and Peterson, 2008;Ziemen et al, 2019). During the last decades, increasing attention has been given to the paleooceanography of the North Pacific and its marginal seas, where interacting dynamic processes of water-mass formation, ocean stratification, sea-level fluctuations, biological productivity, seaice formation, and fresh-water pulses show global connections as integral part of the global MOC and via atmospheric teleconnections (Cook et al, 2005;Diekmann et al, 2008;Takahashi et al, 2011;Gersonde, 2012;Max et al, 2014;Pelto et al, 2018;Lohmann et al, 2019;Davis et al, 2020;Praetorius et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

et al. 2021

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A marine sediment record from the central Bering Sea, spanning the last 20 thousand years (ka), was studied to unravel the depositional history with regard to terrigenous sediment supply and biogenic sedimentation. Methodic approaches comprised the inference of accumulation rates of siliciclastic and biogenic components, grain-size analysis, and (clay) mineralogy, as well as paleoclimatic modelling. Changes in the depositional history provides insight into land-ocean linkages of paleoenvironmental changes. During the finale of the Last Glacial Maximum, the depositional environment was characterized by hemipelagic background sedimentation. A marked change in the terrigenous sediment provenance during the late Heinrich 1 Stadial (15.7–14.5 ka), indicated by increases in kaolinite and a high glaciofluvial influx of clay, gives evidence of the deglaciation of the Brooks Range in the hinterland of Alaska. This meltwater pulse also stimulated the postglacial onset of biological productivity. Glacial melt implies regional climate warming during a time of widespread cooling on the northern hemisphere. Our simulation experiment with a coupled climate model suggests atmospheric teleconnections to the North Atlantic, with impacts on the dynamics of the Aleutian Low system that gave rise to warmer winters and an early onset of spring during that time. The late deglacial period between 14.5 and 11.0 ka was characterized by enhanced fluvial runoff and biological productivity in the course of climate amelioration, sea-level rise, seasonal sea-ice retreat, and permafrost thaw in the hinterland. The latter processes temporarily stalled during the Younger Dryas stadial (12.9-11.7 ka) and commenced again during the Preboreal (earliest Holocene), after 11.7 ka. High river runoff might have fertilized the Bering Sea and contributed to enhanced upper ocean stratification. Since 11.0 ka, advanced transgression has shifted the coast line and fluvial influence of the Yukon River away from the study site. The opening of the Bering Strait strengthened contour currents along the continental slope, leaving behind winnowed sand-rich sediments through the early to mid-Holocene, with non-deposition occurring since about 6.0 ka.

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Section: Paleoenvironmental Implications and Outlookmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

et al. 2021

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“…The forcing mechanisms for these productivity patterns, however, are still a matter of debate (Jaccard et al, 2010;Knudson and Ravelo, 2015;Korff et al, 2016). For the North Pacific, most authors suggest a change of nutrient supply, and in the subarctic marginal seas light limitation through sea ice cover and changes in stratification as main drivers for productivity changes (Narita et al, 2002;Gorbarenko et al, 2004;Kienast et al, 2004;Jaccard et al, 2005;Brunelle et al, 2007;Shigemitsu et al, 2007;Galbraith et al, 2008;Gebhardt et al, 2008;Jaccard et al, 2010;Riethdorf et al, 2013;Davis et al, 2020). As our site is located south of the area where sea ice would have a direct influence on productivity and the average winter SST exceeds 3°C, we exclude it as a forcing mechanism (Supplementary Figure 1).…”

Section: Marine Productivity Changesmentioning

confidence: 99%

ENSO vs glacial-interglacial-induced changes in the Kuroshio-Oyashio transition zone during the Pleistocene

et al. 2023

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The subarctic front (SAF) in the pelagic North Pacific is the northernmost front of the Kuroshio-Oyashio transition zone separating the subpolar and subtropical gyres and is marked by a strong sea surface temperature gradient. A complex interplay of e.g. variations of currents, the wind system and other forcing mechanisms causes shifts of the SAF’s position on timescales from orbital to interannual. In this study, we present proxy data from the Emperor Seamount chain, which reveal a link between long-term ENSO (El Niño/Southern Oscillation) dynamics in the tropics and shifts of the SAF. Based on sediment core SO264-45-2 from Jimmu Seamount (46°33.792’N, 169°36.072’E) located close to the modern position of the SAF, we reconstruct changes in (sub)surface temperature ((sub)SSTMg/Ca) and δ18Osw-ivc (approximating salinities) via combined Mg/Ca and δ18O analyses of the shallow-dwelling foraminifera Globigerina bulloides and the near-thermocline-dwelling Neogloboquadrina pachyderma, biological productivity (XRF-based Ba/Ti ratios), and terrigenous input via dust (XRF-based Fe). From ~600 to ~280 ka BP we observe significantly higher SSTMg/Ca than after an abrupt change at 280 ka BP. We assume that during this time warmer water from the Kuroshio-Oyashio transition zone reached the core site, reflecting a shift of the SAF from a position at or even north of our study site prior to 280 ka BP to a position south of our study site after 280 ka BP. We propose that such a northward displacement of the SAF between 600-280 ka BP was induced by sustained La Niña-like conditions, which led to increased transport of tropical ocean heat into the Kuroshio-Oyashio transition zone via the Kuroshio Current. After ~280 ka BP, the change to more El Niño-like conditions led to less heat transfer via the Kuroshio Current with the SAF remaining south of the core location. In contrast, our productivity record shows a clear glacial-interglacial pattern that is common in the North Pacific. We assume that this pattern is connected to changes in nutrient supply or utilization, which are not primarily driven by changes of the Kuroshio and Oyashio Currents or the SAF.

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“…The SPO has an extremely complex pattern of past climate change, and it plays an important role in Earth's oceanic and climatic evolution (Davis et al, 2020). It is linked with the Sea of Okhotsk in the west via the many straits of the Kuril Islands, and the Bering Sea in the north via the straits of the Aleutian Islands.…”

Section: Oceanographic Settingmentioning

confidence: 99%

Abrupt fluctuations in North Pacific Intermediate Water modulated changes in deglacial atmospheric CO2

Liu

Qiu²,

Li³

et al. 2022

Front. Mar. Sci.

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As a major reservoir of heat and CO2, the Pacific Ocean is an important component of the global climate system, but the nature of its circulation under different climatic conditions remains poorly understood. We present sedimentary records of surface water hydrography and nutrient dynamics from the subarctic Pacific Ocean, with the aim of investigating changes in sea-ice coverage, biological productivity, and sea surface temperature in the subarctic Northwest Pacific since 32 kyr. Our records indicate an enhanced North Pacific surface water stratification from the last glacial to Heinrich Stadial 1, which generally limited the siliceous productivity supply to the surface water. A productivity peak during the Bølling/Allerød warm interval was associated with an increase in the atmospheric pCO2, and it was driven by the increased supply of nutrient- and CO2-rich waters. This process can be attributed to the collapse of the North Pacific Intermediate Water formation at the onset of the Bølling/Allerød interstadial. Moreover, a northward shift of the westerly winds and the gyre boundary could have modulated the expansion of the subpolar gyre, driving changes in poleward heat transport, biogeochemistry, and the hydroclimate of the North Pacific. Our results are consistent with modern evidence for a northward shift of the westerlies in response to global warming, which will likely result in CO2 outgassing from the subarctic Pacific Ocean in the future.

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Sea surface temperature across the Subarctic North Pacific and marginal seas through the past 20,000 years: A paleoceanographic synthesis

Cited by 10 publications

References 109 publications

Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

Deglacial Land-Ocean Linkages at the Alaskan Continental Margin in the Bering Sea

ENSO vs glacial-interglacial-induced changes in the Kuroshio-Oyashio transition zone during the Pleistocene

Abrupt fluctuations in North Pacific Intermediate Water modulated changes in deglacial atmospheric CO2

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