The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition
Annually‐dated snowpit and ice core records from two areas of West Antarctica are used to investigate spatial accumulation patterns and to evaluate temporal accumulation rate/glaciochemical concentration and flux relationships. Mean accumulation rate gradients in Marie Byrd Land (11–23 gcm−2yr−1 ove...
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ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1341 2023-05-15T13:24:06+02:00 The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition Kreutz, Karl J. Mayewski, Paul A. Meeker, L. David Twickler, Mark S. Whitlow, Sallie I. 2000-08-15T07:00:00Z application/pdf https://scholars.unh.edu/faculty_pubs/342 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1341&context=faculty_pubs unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/faculty_pubs/342 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1341&context=faculty_pubs ©2000. American Geophysical Union. All Rights Reserved. Faculty Publications text 2000 ftuninhampshire 2023-01-30T21:49:54Z Annually‐dated snowpit and ice core records from two areas of West Antarctica are used to investigate spatial accumulation patterns and to evaluate temporal accumulation rate/glaciochemical concentration and flux relationships. Mean accumulation rate gradients in Marie Byrd Land (11–23 gcm−2yr−1 over 150 km, decreasing to the south) and Siple Dome (10–18 gcm−2yr−1 over 60 km, decreasing to the south) are consistent for at least the last several decades, and demonstrate the influence of the offshore quasi‐permanent Amundsen Sea low pressure system on moisture flux into the region. Local and regional‐scale topography in both regions appears to affect orographic lifting, air mass trajectories, and accumulation distribution. Linear regression of mean annual soluble ion concentration and flux data vs. accumulation rates in both regions indicates that 1) concentrations are independent of and thus not a rescaling of accumulation rate time‐series, and 2) chemical flux to the ice sheet surface is mainly via wet deposition, and changes in atmospheric concentration play a significant role. We therefore suggest that, in the absence of detailed air/snow transfer models, ice core chemical concentration and not flux time‐series provide a better estimate of past aerosol loading in West Antarctica. Text Amundsen Sea Antarc* Antarctica ice core Ice Sheet Marie Byrd Land West Antarctica University of New Hampshire: Scholars Repository Amundsen Sea Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) West Antarctica |
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Open Polar |
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University of New Hampshire: Scholars Repository |
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ftuninhampshire |
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description |
Annually‐dated snowpit and ice core records from two areas of West Antarctica are used to investigate spatial accumulation patterns and to evaluate temporal accumulation rate/glaciochemical concentration and flux relationships. Mean accumulation rate gradients in Marie Byrd Land (11–23 gcm−2yr−1 over 150 km, decreasing to the south) and Siple Dome (10–18 gcm−2yr−1 over 60 km, decreasing to the south) are consistent for at least the last several decades, and demonstrate the influence of the offshore quasi‐permanent Amundsen Sea low pressure system on moisture flux into the region. Local and regional‐scale topography in both regions appears to affect orographic lifting, air mass trajectories, and accumulation distribution. Linear regression of mean annual soluble ion concentration and flux data vs. accumulation rates in both regions indicates that 1) concentrations are independent of and thus not a rescaling of accumulation rate time‐series, and 2) chemical flux to the ice sheet surface is mainly via wet deposition, and changes in atmospheric concentration play a significant role. We therefore suggest that, in the absence of detailed air/snow transfer models, ice core chemical concentration and not flux time‐series provide a better estimate of past aerosol loading in West Antarctica. |
format |
Text |
author |
Kreutz, Karl J. Mayewski, Paul A. Meeker, L. David Twickler, Mark S. Whitlow, Sallie I. |
spellingShingle |
Kreutz, Karl J. Mayewski, Paul A. Meeker, L. David Twickler, Mark S. Whitlow, Sallie I. The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
author_facet |
Kreutz, Karl J. Mayewski, Paul A. Meeker, L. David Twickler, Mark S. Whitlow, Sallie I. |
author_sort |
Kreutz, Karl J. |
title |
The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
title_short |
The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
title_full |
The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
title_fullStr |
The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
title_full_unstemmed |
The effect of spatial and temporal accumulation rate variability in west Antarctica on soluble ion deposition |
title_sort |
effect of spatial and temporal accumulation rate variability in west antarctica on soluble ion deposition |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2000 |
url |
https://scholars.unh.edu/faculty_pubs/342 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1341&context=faculty_pubs |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Amundsen Sea Byrd Marie Byrd Land Siple Siple Dome West Antarctica |
geographic_facet |
Amundsen Sea Byrd Marie Byrd Land Siple Siple Dome West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica ice core Ice Sheet Marie Byrd Land West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica ice core Ice Sheet Marie Byrd Land West Antarctica |
op_source |
Faculty Publications |
op_relation |
https://scholars.unh.edu/faculty_pubs/342 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1341&context=faculty_pubs |
op_rights |
©2000. American Geophysical Union. All Rights Reserved. |
_version_ |
1766377410040692736 |