Coletti, A. J., DeConto, R. M., Brigham-Grette, J. and Melles, M. (2015). A GCM comparison of Pleistocene super-interglacial periods in relation to Lake El'gygytgyn, NE Arctic Russia. Clim. Past., 11 (7). S. 979 - 990. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1814-9332

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Abstract

Until now, the lack of time-continuous, terrestrial paleoenvironmental data from the Pleistocene Arctic has made model simulations of past interglacials difficult to assess. Here, we compare climate simulations of four warm interglacials at Marine Isotope Stages (MISs) 1 (9 ka), 5e (127 ka), 11c (409 ka) and 31 (1072 ka) with new proxy climate data recovered from Lake El'gygytgyn, NE Russia. Climate reconstructions of the mean temperature of the warmest month (MTWM) indicate conditions up to 0.4, 2.1, 0.5 and 3.1 degrees C warmer than today during MIS 1, 5e, 11c and 31, respectively. While the climate model captures much of the observed warming during each interglacial, largely in response to boreal summer (JJA) orbital forcing, the extraordinary warmth of MIS 11c compared to the other interglacials in the Lake El'gygytgyn temperature proxy reconstructions remains difficult to explain. To deconvolve the contribution of multiple influences on interglacial warming at Lake El'gygytgyn, we isolated the influence of vegetation, sea ice and circum-Arctic land ice feedbacks on the modeled climate of the Beringian interior. Simulations accounting for climate-vegetation-land-surface feedbacks during all four interglacials show expanding boreal forest cover with increasing summer insolation intensity. A deglaciated Greenland is shown to have a minimal effect on northeast Asian temperature during the warmth of stages 11c and 31 (Melles et al., 2012). A prescribed enhancement of oceanic heat transport into the Arctic Ocean does have some effect on Lake El'gygytgyn's regional climate, but the exceptional warmth of MIS 11c remains enigmatic compared to the modest orbital and greenhouse gas forcing during that interglacial.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Coletti, A. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
DeConto, R. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brigham-Grette, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melles, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-416213
DOI: 10.5194/cp-11-979-2015
Journal or Publication Title: Clim. Past.
Volume: 11
Number: 7
Page Range: S. 979 - 990
Date: 2015
Publisher: COPERNICUS GESELLSCHAFT MBH
Place of Publication: GOTTINGEN
ISSN: 1814-9332
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
GREENLAND ICE-SHEET; CARBON-DIOXIDE CONCENTRATION; SEA-ICE; CLIMATE; PLIOCENE; RECORD; PRECIPITATION; AMPLIFICATION; TEMPERATURES; VARIABILITYMultiple languages
Geosciences, Multidisciplinary; Meteorology & Atmospheric SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/41621

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