气候变化领域集成服务门户(CCPortal): Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations

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DOI	10.5194/cp-16-2485-2020
	Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations
	Malmierca-Vallet I.; Sime L.C.; Valdes P.J.; Tindall J.C.
发表日期	2020
ISSN	1814-9324
卷号	16 期号:6
英文摘要	Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope (18O) records from ice cores offer information on past changes in the surface of the GIS. Here, we use the isotope-enabled Hadley Centre Coupled Model version 3 (HadCM3) climate model to simulate a set of last interglacial (LIG) idealised GIS surface elevation change scenarios focusing on GIS ice core sites. We investigate how 18O depends on the magnitude and sign of GIS elevation change and evaluate how the response is altered by sea ice changes. We find that modifying GIS elevation induces changes in Northern Hemisphere atmospheric circulation, sea ice and precipitation patterns. These climate feedbacks lead to ice-core-Averaged isotopic lapse rates of 0.49 (100 m)1 for the lowered GIS states and 0.29 (100 m)1 for the enlarged GIS states. This is lower than the spatially derived Greenland lapse rates of 0.62 0.72 (100 m)1. These results thus suggest nonlinearities in the isotope elevation relationship and have consequences for the interpretation of past elevation and climate changes across Greenland. In particular, our results suggest that winter sea ice changes may significantly influence isotope elevation gradients: winter sea ice effect can decrease (increase) modelled core-Averaged isotopic lapse rate values by about 19% (and C28 %) for the lowered (enlarged) GIS states, respectively. The largest influence of sea ice on 18O changes is found in coastal regions like the Camp Century site. © 2016 SPIE. All rights reserved.
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183628
作者单位	British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom
推荐引用方式 GB/T 7714	Malmierca-Vallet I.,Sime L.C.,Valdes P.J.,et al. Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations[J],2020,16(6).
APA	Malmierca-Vallet I.,Sime L.C.,Valdes P.J.,&Tindall J.C..(2020).Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations.Climate of the Past,16(6).
MLA	Malmierca-Vallet I.,et al."Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations".Climate of the Past 16.6(2020).