Linking glacier extent and summer temperature in NE Russia - Implications for precipitation during the global Last Glacial Maximum

Meyer, Vera; Barr, Iestyn D.

doi:10.1016/j.palaeo.2016.12.038

Cited by 6 publications

(11 citation statements)

References 79 publications

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“…MTWA and P ANN are important variables as they are major controls of the energy balance of glaciers (Reeh, 1989). While very low P ANN values are the prevalent explanation for missing large ice sheets during the LGM in Western and Central Siberia (Stauch and Gualtieri, 2008), relatively warm summer temperatures were proposed as limiting factors for the extent of glaciers in the pacific sector (Meyer and Barr, 2017). Forcing ice sheet models with our data-constrained estimates or with weighted means of simulation ensembles might result in new insights into the mechanisms behind the glacial history of Siberia.…”

Section: Potential Applications and Extensionsmentioning

confidence: 84%

“…In the Pacific sector glaciers were near present-day extension during the LGM (Meyer and Barr, 2017;Stauch and Gualtieri, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Lozhkin et al (2007) reconstruct substantially negative summer temperature anomalies for the more continental El'gygytgyn Lake. In the Pacific sector, Meyer et al (2017) reconstructLGM summer temperatures similar to today on Kamchatka peninsula from branched glycerol dialkyl glycerol tetraethers and infer similar or higher precipitation amounts from these estimates via indirect glacier modeling (Meyer and Barr, 2017). Off the Pacific coast, Kiefer et al (2001) and Meyer et al (2016) infer summer sea surface temperature anomalies around -1.5 K from Foraminifera assemblages and Tetra Ether index (TEX 86 ) based paleothermometry in the Northwest Pacific, compared to -2 K to -6 K anomalies in MARGO Project Members (2009).…”

Section: Introductionmentioning

confidence: 99%

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A spatial reconstruction of Siberian Last Glacial Maximum climate from pollen data

Weitzel¹,

Hense²,

Herzschuh³

et al. 2022

Preprint

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The Last Glacial Maximum (LGM, around 21.000 years before present) was a period with significantly colder global mean temperature, large Northern Hemisphere ice sheets, and lower CO2 concentrations. Siberia was affected by a lower sea level which led to a closed Bering strait and a northward shift of the Arctic Ocean coastline. However, unlike other high-latitude areas, Siberia was not covered by a terrestrial ice sheet at that time. Climate simulations with LGM boundary conditions show large inter-model differences especially in Northern Siberia, which impede a direct analysis of Siberian LGM climate from simulations. Preserved pollen samples provide information on the LGM vegetation and climate state.We reconstruct mean temperature of the warmest month and mean annual precipitation from a network of pollen samples using weighted averaging partial least squares transfer functions. Combining these local reconstructions with a multi-model ensemble of PMIP3 climate simulations in a Bayesian framework, we obtain the first probabilistic spatial reconstruction of Siberian LGM climate. Our reconstruction shows less cold summer temperature anomalies along the coastlines than in Western Siberia, and a weaker precipitation reduction in Eastern Siberia compared to Western Siberia. Finally, we quantify the mismatch between each ensemble member and the proxy data. By examining common features among similarly performing simulations, we find that most simulations with a comparatively warm and wet Siberian climate score better.Our data constrained state estimate is well-suited for future analyses of Siberian LGM climate. Potential applications include the investigation of reasons for the absence of a Siberian ice sheet during the LGM, the quantification of land-atmosphere carbon fluxes, and the estimation of past afforestation rates.

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Section: Potential Applications and Extensionsmentioning

confidence: 84%

“…In the Pacific sector glaciers were near present-day extension during the LGM (Meyer and Barr, 2017;Stauch and Gualtieri, 2008).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A spatial reconstruction of Siberian Last Glacial Maximum climate from pollen data

Weitzel¹,

Hense²,

Herzschuh³

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…The interplay of the westerlies with monsoon systems also could have been important: the last glacial could have been characterized by a stronger atmospheric pressure gradient between high and low latitudes, which might not only have enhanced the westerlies but weakened the East Asian summer monsoon and strengthened the East Asian winter monsoon. In addition, a reduction of southerly winds due to a weakening of the North Pacific High over the northwest Pacific (Meyer and Barr, 2017) might have played a role.…”

Section: Discussionmentioning

confidence: 99%

Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China

Zheng

Pancost

Liu

et al. 2017

Geology

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Variations in atmospheric circulation across the last deglaciation in the northernmost monsoon-influenced regions of Asia are not well constrained, highlighting a fundamental gap in our understanding of Asian climate. Here we reconstruct continental air temperatures for northeast China across the last deglaciation (past 16 k.y.), based on the distribution of bacterial branched glycerol dialkyl glycerol tetraethers in a sequence of the Hani peat (Jilin Province, northeast China). Our results indicate large (as much as 10 °C) oscillations in temperature in northeast China across the deglaciation, oscillations significantly larger than observed in other temperature records from low-latitude or same-latitude East Asia, but consistent with climate model simulations. This enhanced magnitude, as well as the timing of temperature variations, provides evidence for atmospheric teleconnections with high latitudes; in particular, we suggest that highlatitude cooling associated with Arctic ice expansion and changes in Atlantic Meridional Overturning Circulation enhanced the intensity and lowered the temperature of Eurasian mid-latitude westerlies and northwesterly winds over East Asia during the last glacial, delivering cold air masses to northeast China. During the deglaciation the westerlies and therefore delivery of cold air masses weakened, amplifying the deglacial warming in this region. We conclude that changes in North Atlantic climate had a particularly strong impact on the northernmost parts of the East Asian monsoon-influenced area.

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“…glaciogenic features mapped off the NE Siberian continental shelf (Niessen et al, 2013), a glacially scoured trough on the outer margin north of De Long Islands (O'Regan et al, 2017), and glacial deposits on the New Siberian Islands (Nikolskiy et al, 2017). Partly due to poor age controls, it remains highly controversial (Barr and Clark, 2012a) whether the glacial evidence points towards a pre-LGM ice sheet over NE Siberia- The concept of Laurentide-Eurasia-only ice sheets should be compatible with the full range of paleoclimate evidence if it is right, but a mounting number of paleoclimate reconstructions from around the North Pacific show conflicts to the concept (e.g., Meyer and Barr, 2017;Bakker et al, 2020). Therefore, in this study, we first review paleoclimate evidence from around the North Pacific, and then use climate and ice sheet modelling to investigate whether the conflicts can be solved with the Laurentide-Eurasia-only ice sheets, and whether an ice sheet over NE Siberia-Beringia is needed to reconcile the paleoclimate evidence.…”

Section: Introductionmentioning

confidence: 99%

Rapid waxing and waning of Beringian ice sheet reconcile glacial climate records from around North Pacific

Zhang

Yan

Zhang

et al. 2020

Preprint

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Abstract. Throughout the Pleistocene the Earth has experienced pronounced glacial-interglacial cycles, which have been debated for decades. One concept widely held is that during most glacials only the Laurentide-Eurasian ice sheets across North America and Northwest Eurasia became expansive, while Northeast Siberia-Beringia remained ice-sheet-free. However, the recognition of glacial landforms and deposits on Northeast Siberia-Beringia and off the Siberian continental shelf is beginning to call into question this paradigm. Here, we combine climate and ice sheet modelling with well-dated paleoclimate records from the mid-to-high latitude North Pacific to demonstrate the episodic occurrences of an ice sheet across Northeast Siberia-Beringia. Our simulations first show that the paleoclimate records are irreconcilable with the established paradigm of Laurentide-Eurasia-only ice sheets, and then reveal that a Beringian ice sheet over Northeast Siberia-Beringia causes feedbacks between atmosphere and ocean, the result of which better explains these climate records from around the North Pacific during the past four glacial-interglacial cycles. Our simulations propose an alternative scenario for NH ice sheet evolution, which involves the rapid waxing and waning of the Beringian ice sheet alongside the growth of the Laurentide-Eurasian ice sheets. The new scenario settles the long-standing discrepancies between the direct glacial evidence and the climate evolution from around the mid-to-high latitude North Pacific. It depicts a high complexity in glacial climates and has important implications for our understanding of the dispersal of prehistoric humans through Beringia into North America.

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Linking glacier extent and summer temperature in NE Russia - Implications for precipitation during the global Last Glacial Maximum

Cited by 6 publications

References 79 publications

A spatial reconstruction of Siberian Last Glacial Maximum climate from pollen data

A spatial reconstruction of Siberian Last Glacial Maximum climate from pollen data

Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China

Rapid waxing and waning of Beringian ice sheet reconcile glacial climate records from around North Pacific

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