Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data
An updated accumulation map for Greenland is presented on the basis of 39 new ice core estimates of accumulation, 256 ice sheet estimates from ice cores and snow pits used in previous maps, and reanalysis of time series data from 20 coastal weather stations. The period 1950-2000 is better represente...
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Language: | English |
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2009
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Online Access: | http://www.escholarship.org/uc/item/29g79722 |
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ftcdlib:qt29g79722 2023-05-15T16:27:22+02:00 Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data Bales, RC Guo, Q Shen, D McConnell, JR Du, G Burkhart, JF Spikes, VB Hanna, E Cappelen, J D06116 2009-03-27 application/pdf http://www.escholarship.org/uc/item/29g79722 english eng eScholarship, University of California qt29g79722 http://www.escholarship.org/uc/item/29g79722 public Bales, RC; Guo, Q; Shen, D; McConnell, JR; Du, G; Burkhart, JF; et al.(2009). Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data. Journal of Geophysical Research Atmospheres, 114(6), D06116. doi:10.1029/2008JD011208. UC Merced: Retrieved from: http://www.escholarship.org/uc/item/29g79722 article 2009 ftcdlib https://doi.org/10.1029/2008JD011208 2018-07-13T22:52:33Z An updated accumulation map for Greenland is presented on the basis of 39 new ice core estimates of accumulation, 256 ice sheet estimates from ice cores and snow pits used in previous maps, and reanalysis of time series data from 20 coastal weather stations. The period 1950-2000 is better represented by the data than are earlier periods. Ice-sheetwide accumulation was estimated based on kriging. The average accumulation (95% confidence interval, or ±2 times standard error) over the Greenland ice sheet is 30.0 ± 2.4 g cm -2 a -1 , with the average accumulation above 2000-m elevation being essentially the same, 29.9 ± 2.2 g cm -2 a -1 . At higher elevations the new accumulation map maintains the main features shown in previous maps. However, there are five coastal areas with obvious differences: southwest, northwest, and eastern regions, where the accumulation values are 20-50% lower than previously estimated, and southeast and northeast regions, where the accumulation values are 20-50% higher than previously estimated. These differences are almost entirely due to new coastal data. The much lower accumulation in the southwest and the much higher accumulation in the southeast indicated by the current map mean that long-term mass balance in both catchments is closer to steady state than previously estimated. However, uncertainty in these areas remains high owing to strong gradients in precipitation from the coast inland. A significant and sustained precipitation measurement program will be needed to resolve this uncertainty. Copyright 2009 by the American Geophysical Union. Article in Journal/Newspaper Greenland ice core Ice Sheet University of California: eScholarship Greenland Journal of Geophysical Research 114 D6 |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
description |
An updated accumulation map for Greenland is presented on the basis of 39 new ice core estimates of accumulation, 256 ice sheet estimates from ice cores and snow pits used in previous maps, and reanalysis of time series data from 20 coastal weather stations. The period 1950-2000 is better represented by the data than are earlier periods. Ice-sheetwide accumulation was estimated based on kriging. The average accumulation (95% confidence interval, or ±2 times standard error) over the Greenland ice sheet is 30.0 ± 2.4 g cm -2 a -1 , with the average accumulation above 2000-m elevation being essentially the same, 29.9 ± 2.2 g cm -2 a -1 . At higher elevations the new accumulation map maintains the main features shown in previous maps. However, there are five coastal areas with obvious differences: southwest, northwest, and eastern regions, where the accumulation values are 20-50% lower than previously estimated, and southeast and northeast regions, where the accumulation values are 20-50% higher than previously estimated. These differences are almost entirely due to new coastal data. The much lower accumulation in the southwest and the much higher accumulation in the southeast indicated by the current map mean that long-term mass balance in both catchments is closer to steady state than previously estimated. However, uncertainty in these areas remains high owing to strong gradients in precipitation from the coast inland. A significant and sustained precipitation measurement program will be needed to resolve this uncertainty. Copyright 2009 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Bales, RC Guo, Q Shen, D McConnell, JR Du, G Burkhart, JF Spikes, VB Hanna, E Cappelen, J |
spellingShingle |
Bales, RC Guo, Q Shen, D McConnell, JR Du, G Burkhart, JF Spikes, VB Hanna, E Cappelen, J Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
author_facet |
Bales, RC Guo, Q Shen, D McConnell, JR Du, G Burkhart, JF Spikes, VB Hanna, E Cappelen, J |
author_sort |
Bales, RC |
title |
Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
title_short |
Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
title_full |
Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
title_fullStr |
Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
title_full_unstemmed |
Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
title_sort |
annual accumulation for greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data |
publisher |
eScholarship, University of California |
publishDate |
2009 |
url |
http://www.escholarship.org/uc/item/29g79722 |
op_coverage |
D06116 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
Bales, RC; Guo, Q; Shen, D; McConnell, JR; Du, G; Burkhart, JF; et al.(2009). Annual accumulation for Greenland updated using ice core data developed during 2000-2006 and analysis of daily coastal meteorological data. Journal of Geophysical Research Atmospheres, 114(6), D06116. doi:10.1029/2008JD011208. UC Merced: Retrieved from: http://www.escholarship.org/uc/item/29g79722 |
op_relation |
qt29g79722 http://www.escholarship.org/uc/item/29g79722 |
op_rights |
public |
op_doi |
https://doi.org/10.1029/2008JD011208 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
D6 |
_version_ |
1766016524328370176 |