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Climatic Signals from 76 Shallow Firn Cores in Dronning Maud Land, East Antarctica : Volume 8, Issue 6 (02/12/2014)

By Altnau, S.

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Book Id: WPLBN0004023129
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: Climatic Signals from 76 Shallow Firn Cores in Dronning Maud Land, East Antarctica : Volume 8, Issue 6 (02/12/2014)  
Author: Altnau, S.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Isaksson, E., Schlosser, E., Divine, D., & Altnau, S. (2014). Climatic Signals from 76 Shallow Firn Cores in Dronning Maud Land, East Antarctica : Volume 8, Issue 6 (02/12/2014). Retrieved from http://nook-library.net/


Description
Description: Institute of Meteorology and Geophysics, Center for Climate and Cryosphere, University of Innsbruck, 6020 Innsbruck, Austria. The spatial and temporal distribution of surface mass balance (SMB) and δ18O were investigated in the first comprehensive study of a set of 76 firn cores retrieved by various expeditions during the past three decades in Dronning Maud Land, East Antarctica. The large number of cores was used to calculate stacked records of SMB and δ18O, which considerably increased the signal-to-noise ratio compared to earlier studies and facilitated the detection of climatic signals. Considerable differences between cores from the interior plateau and the coastal cores were found. The δ18O of both the plateau and the ice shelf cores exhibit a slight positive trend over the second half of the 20th century. In the corresponding period, the SMB has a negative trend in the ice shelf cores, but increases on the plateau. Comparison with meteorological data from Neumayer Station revealed that for the ice shelf regions atmospheric dynamic effects are more important than thermodynamics, while on the plateau, the temporal variations of SMB and δ18O occur mostly in parallel, thus can be explained by thermodynamic effects. The Southern Annular Mode (SAM) exhibits a positive trend since the mid-1960s, which is assumed to lead to a cooling of East Antarctica. This is not confirmed by the firn core data in our data set. Changes in the atmospheric circulation that result in a changed seasonal distribution of precipitation/accumulation could partly explain the observed features in the ice shelf cores.

Summary
Climatic signals from 76 shallow firn cores in Dronning Maud Land, East Antarctica

Excerpt
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