Snow accumulation variability over the West Antarctic Ice Sheet since 1900: a comparison of ice core records with ERA-20C reanalysis

This study uses a set of 37 firn core records over the West Antarctic Ice Sheet (WAIS) to test the performance of ERA-20C reanalysis for snow accumulation and quantify temporal variability in snow accumulation since 1900. The firn cores are allocated to four geographical areas demarcated by drainage...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Wang, Yetang, Thomas, Elizabeth R., Hou, Shugui, Huai, Baojuan, Wu, Shuangye, Sun, Weijun, Qi, Shanzhong, Ding, Minghu, Zhang, Yulun
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2017
Subjects:
Antarctic
Antarctic Peninsula
Amundsen Sea
West Antarctic Ice Sheet
Antarc*
ice core
Ice Sheet
Sea ice
Online Access:http://nora.nerc.ac.uk/id/eprint/518353/
https://nora.nerc.ac.uk/id/eprint/518353/1/Wang_et_al-2017-Geophysical_Research_Letters.pdf
https://doi.org/10.1002/2017GL075135
Description
Summary:This study uses a set of 37 firn core records over the West Antarctic Ice Sheet (WAIS) to test the performance of ERA-20C reanalysis for snow accumulation and quantify temporal variability in snow accumulation since 1900. The firn cores are allocated to four geographical areas demarcated by drainage divides (i.e., Antarctic Peninsula (AP), western WAIS, central WAIS and eastern WAIS) to calculate stacked records of regional snow accumulation. Our results show that the inter-annual variability in ERA-20C precipitation minus evaporation (P-E) agrees well with the corresponding ice core snow accumulation composites in each of the four geographical regions, suggesting its skill for simulating snow accumulation changes before the modern satellite era (pre-1979). Snow accumulation experiences significantly positive trends for the AP and eastern WAIS, a negative trend for the western WAIS, and no significant trend for the central WAIS from 1900 to 2010. The contrasting trends are associated with changes in the large-scale moisture transport driven by a deepening of the low-pressure systems and anomalies of sea ice in the Amundsen Sea Low (ASL) region.

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