Holocene variability in sea surface temperature and sea ice extent in the northern Bering Sea: A multiple biomarker study

Ruan, Jiaping; Huang, Yan; Shi, Xuefa; Liu, Yanguang; Xiao, Wenjie; Xu, Yunping

doi:10.1016/j.orggeochem.2017.08.006

Cited by 13 publications

(3 citation statements)

References 70 publications

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“…Assuming a stable moisture source through the Holocene, the observed d excess trend could reflect a cooling in North Pacific SST and/or rise in RH in the moisture source region. SST proxies encompassing a large area of the North Pacific broadly agree that SSTs peaked around ~10 ka and cooled by ~1–2 K by the mid-Holocene 29,30 . However, spatial coherence diminishes in the late Holocene with some SST reconstructions, indicating warming and others cooling.…”

Section: Resultsmentioning

confidence: 81%

Recent summer warming in northwestern Canada exceeds the Holocene thermal maximum

et al. 2019

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Eastern Beringia is one of the few Western Arctic regions where full Holocene climate reconstructions are possible. However, most full Holocene reconstructions in Eastern Beringia are based either on pollen or midges, which show conflicting early Holocene summer temperature histories. This discrepancy precludes understanding the factors that drove past (and potentially future) climate change and calls for independent proxies to advance the debate. We present a ~13.6 ka summer temperature reconstruction in central Yukon, part of Eastern Beringia, using precipitation isotopes in syngenetic permafrost. The reconstruction shows that early Holocene summers were consistently warmer than the Holocene mean, as supported by midges, and a thermal maximum at ~7.6–6.6 ka BP. This maximum was followed by a ~6 ka cooling, and later abruptly reversed by industrial-era warming leading to a modern climate that is unprecedented in the Holocene context and exceeds the Holocene thermal maximum by +1.7 ± 0.7 °C.

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Section: Resultsmentioning

confidence: 81%

Recent summer warming in northwestern Canada exceeds the Holocene thermal maximum

et al. 2019

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“…Fahl and Stein, 2012;Stein et al, 2012;Cabedo-Sanz et al, 2013). It has also been suggested that variable DIP25 might be indicative of changes to SST based on some empirical observations and alignment with other SST proxies (Vare et al, 2009;Cabedo-Sanz et al, 2013;Xiao et al, 2013;Müller and Stein, 2014;Ruan et al, 2017); however, there are as yet no in situ data to support these interpretations (Belt, 2018). In general, proxies based on ratios of biomarkers are better at accommodating the effects of degradative processes, even if such effects cannot be totally eliminated.…”

Section: Potential Effects Of Degradation Processes On the Dip25 Indexmentioning

confidence: 96%

Autoxidation of the sea ice biomarker proxy IPSO25 in the near-surface oxic layers of Arctic and Antarctic sediments

Rontani

Smik

Belt

2019

Organic Geochemistry

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Over the last decade or so, the mono-and di-unsaturated highly branched isoprenoid (HBI) lipids IP25 (Ice Proxy with carbon atoms) and IPSO25 (Ice Proxy for the Southern Ocean with 25 carbon atoms) have emerged as useful proxies for sea ice in the Arctic and Antarctic, respectively. A more complete understanding of their respective proxy signatures, however, requires more detailed knowledge of their stability in the water column and in sediments. In the current study, we focused on the autoxidation of IPSO25, first by performing laboratorybased oxidation reactions on a purified sample and characterizing products based on detailed mass spectral analysis. We then analysed for the same oxidation products in near-surface sediments retrieved from the Arctic and the Antarctic, and some suspended organic matter from the Antarctic. Our data show that IPSO25 is susceptible to partial autoxidation within the oxic layers of Arctic and Antarctic sediments, while the same processes appear not to be so important in the water column. Although the number of primary autoxidation reactions identified in sediments was not as large as in laboratory experiments, there was evidence for their subsequent modification by biotic degradation. Quantifying the extent of degradation of IPSO25 and IP25 in sediments, and thus the impact of such process on the use of these biomarkers as paleo sea ice proxies, remains challenging at this stage, since most of the primary oxidation products do not accumulate, likely due to to secondary biodegradation reactions. Some interesting differences in reactivity were also observed between IPSO25 and IP25 present in the same Arctic sediments. This suggests that factors other than environmental control may influence the IPSO25/IP25 ratio (i.e. DIP25) in Arctic sediments.

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“…Thus, the Atlantic and Pacific water inflows act to melt the Arctic sea ice later than the control by the river heat discharge in early summer. Throughout the Holocene, biotic and biomarker records indicate that the Atlantic water inflow exhibited a relatively stable state with millennial-scale variability since the MH 55 – 57 , also similar to the Pacific water inflow 58 , 59 (Supplementary Fig. 12 ).…”

Section: Discussionmentioning

confidence: 88%

Enhanced Arctic sea ice melting controlled by larger heat discharge of mid-Holocene rivers

et al. 2022

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Arctic sea ice retreat is linked to extrapolar thermal energy import, while the potential impact of pan-Arctic river heat discharge on sea-ice loss has been unresolved. We reconstructed the Holocene history of Arctic sea ice and Russian pan-Arctic river heat discharge, combining ice-rafted debris records and sedimentation rates from the East Siberian Arctic Shelf with a compilation of published paleoclimate and observational data. In the mid-Holocene, the early summer (June–July) solar insolation was higher than that during the late Holocene, which led to a larger heat discharge of the Russian pan-Arctic rivers and contributed to more Arctic sea ice retreat. This intensified decline of early-summer sea ice accelerated the melting of sea ice throughout the summertime by lowering regional albedos. Our findings highlight the important impact of the larger heat discharge of pan-Arctic rivers, which can reinforce Arctic sea-ice loss in the summer in the context of global warming.

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Holocene variability in sea surface temperature and sea ice extent in the northern Bering Sea: A multiple biomarker study

Cited by 13 publications

References 70 publications

Recent summer warming in northwestern Canada exceeds the Holocene thermal maximum

Recent summer warming in northwestern Canada exceeds the Holocene thermal maximum

Autoxidation of the sea ice biomarker proxy IPSO25 in the near-surface oxic layers of Arctic and Antarctic sediments

Enhanced Arctic sea ice melting controlled by larger heat discharge of mid-Holocene rivers

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