Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries
Ice cores collected in 2000 (ITASE 00-1) and 2005 (WDC05A, WDC05Q) from the West Antarctic Ice Sheet Divide (WAIS Divide) project site were used to investigate the spatial and temporal variability in accumulation. The ice cores were dated based on annual layer counting of multiple glaciochemical mea...
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ftcdlib:oai:escholarship.org/ark:/13030/qt75z1x4cw 2023-05-15T13:39:57+02:00 Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries Banta, JR McConnell, JR Frey, MM Bales, RC Taylor, K 2008-12-16 https://escholarship.org/uc/item/75z1x4cw unknown eScholarship, University of California qt75z1x4cw https://escholarship.org/uc/item/75z1x4cw public Journal of Geophysical Research Atmospheres, vol 113, iss 23 Meteorology & Atmospheric Sciences article 2008 ftcdlib 2020-03-20T23:55:31Z Ice cores collected in 2000 (ITASE 00-1) and 2005 (WDC05A, WDC05Q) from the West Antarctic Ice Sheet Divide (WAIS Divide) project site were used to investigate the spatial and temporal variability in accumulation. The ice cores were dated based on annual layer counting of multiple glaciochemical measurements resulting in bottom depth ages for WDC05A, VVDC05Q, and ITASE 00-1 of 1775, 1521, and 1653 A.D., with mean annual accumulation rates of 0.200, 0.204, and 0.221 mweq a-1, respectively. Small-scale spatial variability (SSV) was determined using an analysis of variance of accumulation in the ice core array, thereby quantifying the uncertainty in individual accumulation records. Results indicate that the spatial variability was 0.030 mweq a-1, or approximately 15% of the average annual accumulation. An accumulation record representative of the WAIS Divide local area over recent centuries was developed using a principal component analysis to identify the coherent accumulation signal. The WAIS Divide local record exhibited 14% interannual variability (1 standard deviation of the mean) with the SSV reduced to 0.017 mweq a-1. Correlations of the WAIS Divide local accumulation record with atmospheric indices (e.g., Antarctic Oscillation) exhibited periods when the records oscillate in and out of phase. Thus, reconstructing local and global atmospheric indices from WAIS Divide accumulation records over recent centuries may prove problematic. Copyright 2008 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet University of California: eScholarship Antarctic West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Banta, JR McConnell, JR Frey, MM Bales, RC Taylor, K Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
Ice cores collected in 2000 (ITASE 00-1) and 2005 (WDC05A, WDC05Q) from the West Antarctic Ice Sheet Divide (WAIS Divide) project site were used to investigate the spatial and temporal variability in accumulation. The ice cores were dated based on annual layer counting of multiple glaciochemical measurements resulting in bottom depth ages for WDC05A, VVDC05Q, and ITASE 00-1 of 1775, 1521, and 1653 A.D., with mean annual accumulation rates of 0.200, 0.204, and 0.221 mweq a-1, respectively. Small-scale spatial variability (SSV) was determined using an analysis of variance of accumulation in the ice core array, thereby quantifying the uncertainty in individual accumulation records. Results indicate that the spatial variability was 0.030 mweq a-1, or approximately 15% of the average annual accumulation. An accumulation record representative of the WAIS Divide local area over recent centuries was developed using a principal component analysis to identify the coherent accumulation signal. The WAIS Divide local record exhibited 14% interannual variability (1 standard deviation of the mean) with the SSV reduced to 0.017 mweq a-1. Correlations of the WAIS Divide local accumulation record with atmospheric indices (e.g., Antarctic Oscillation) exhibited periods when the records oscillate in and out of phase. Thus, reconstructing local and global atmospheric indices from WAIS Divide accumulation records over recent centuries may prove problematic. Copyright 2008 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Banta, JR McConnell, JR Frey, MM Bales, RC Taylor, K |
author_facet |
Banta, JR McConnell, JR Frey, MM Bales, RC Taylor, K |
author_sort |
Banta, JR |
title |
Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
title_short |
Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
title_full |
Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
title_fullStr |
Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
title_full_unstemmed |
Spatial and temporal variability in snow accumulation at the West Antarctic Ice Sheet Divide over recent centuries |
title_sort |
spatial and temporal variability in snow accumulation at the west antarctic ice sheet divide over recent centuries |
publisher |
eScholarship, University of California |
publishDate |
2008 |
url |
https://escholarship.org/uc/item/75z1x4cw |
geographic |
Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic ice core Ice Sheet |
genre_facet |
Antarc* Antarctic ice core Ice Sheet |
op_source |
Journal of Geophysical Research Atmospheres, vol 113, iss 23 |
op_relation |
qt75z1x4cw https://escholarship.org/uc/item/75z1x4cw |
op_rights |
public |
_version_ |
1766126379345117184 |