Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica
[1] Our understanding of past sea-ice variability is limited by the short length of satellite and instrumental records. Proxy records can extend these observations but require further development and validation. We compare methanesulfonic acid (MSA) and chloride (Cl-) concentrations from a new firn...
Published in: | Journal of Geophysical Research: Oceans |
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ftclarkuniv:oai:commons.clarku.edu:faculty_geography-1228 2023-09-05T13:11:45+02:00 Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica Criscitiello, Alison S. Das, Sarah B. Evans, Matthew J. Frey, Karen E. Conway, Howard Joughin, Ian Medley, Brooke Steig, Eric J. 2013-01-01T08:00:00Z application/pdf https://commons.clarku.edu/faculty_geography/229 https://doi.org/10.1029/2012JC008077 https://commons.clarku.edu/context/faculty_geography/article/1228/viewcontent/GeoFacWorks_Frey_IceSheet_2013.pdf unknown Clark Digital Commons https://commons.clarku.edu/faculty_geography/229 doi:10.1029/2012JC008077 https://commons.clarku.edu/context/faculty_geography/article/1228/viewcontent/GeoFacWorks_Frey_IceSheet_2013.pdf Geography concentration (composition) correlation glaciochemistry ice sheet polynya regional climate satellite imagery sea ice spatial analysis Oceanography Remote Sensing text 2013 ftclarkuniv https://doi.org/10.1029/2012JC008077 2023-08-14T06:16:39Z [1] Our understanding of past sea-ice variability is limited by the short length of satellite and instrumental records. Proxy records can extend these observations but require further development and validation. We compare methanesulfonic acid (MSA) and chloride (Cl-) concentrations from a new firn core from coastal West Antarctica with satellite-derived observations of regional sea-ice concentration (SIC) in the Amundsen Sea (AS) to evaluate spatial and temporal correlations from 2002-2010. The high accumulation rate (∼39 g·cm-2·yr-1) provides monthly resolved records of MSA and Cl-, allowing detailed investigation of how regional SIC is recorded in the ice-sheet stratigraphy. Over the period 2002-2010 we find that the ice-sheet chemistry is significantly correlated with SIC variability within the AS and Pine Island Bay polynyas. Based on this result, we evaluate the use of ice-core chemistry as a proxy for interannual polynya variability in this region, one of the largest and most persistent polynya areas in Antarctica. MSA concentrations correlate strongly with summer SIC within the polynya regions, consistent with MSA at this site being derived from marine biological productivity during the spring and summer. Cl- concentrations correlate strongly with winter SIC within the polynyas as well as some regions outside the polynyas, consistent with Cl- at this site originating primarily from winter sea-ice formation. Spatial correlations were generally insignificant outside of the polynya areas, with some notable exceptions. Ice-core glaciochemical records from this dynamic region thus may provide a proxy for reconstructing AS and Pine Island Bay polynya variability prior to the satellite era. © 2012. American Geophysical Union. All Rights Reserved. Text Amundsen Sea Antarc* Antarctica ice core Ice Sheet Pine Island Pine Island Bay Sea ice West Antarctica Clark University: Clark Digital Commons Amundsen Sea Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) West Antarctica Journal of Geophysical Research: Oceans 118 1 118 130 |
institution |
Open Polar |
collection |
Clark University: Clark Digital Commons |
op_collection_id |
ftclarkuniv |
language |
unknown |
topic |
concentration (composition) correlation glaciochemistry ice sheet polynya regional climate satellite imagery sea ice spatial analysis Oceanography Remote Sensing |
spellingShingle |
concentration (composition) correlation glaciochemistry ice sheet polynya regional climate satellite imagery sea ice spatial analysis Oceanography Remote Sensing Criscitiello, Alison S. Das, Sarah B. Evans, Matthew J. Frey, Karen E. Conway, Howard Joughin, Ian Medley, Brooke Steig, Eric J. Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
topic_facet |
concentration (composition) correlation glaciochemistry ice sheet polynya regional climate satellite imagery sea ice spatial analysis Oceanography Remote Sensing |
description |
[1] Our understanding of past sea-ice variability is limited by the short length of satellite and instrumental records. Proxy records can extend these observations but require further development and validation. We compare methanesulfonic acid (MSA) and chloride (Cl-) concentrations from a new firn core from coastal West Antarctica with satellite-derived observations of regional sea-ice concentration (SIC) in the Amundsen Sea (AS) to evaluate spatial and temporal correlations from 2002-2010. The high accumulation rate (∼39 g·cm-2·yr-1) provides monthly resolved records of MSA and Cl-, allowing detailed investigation of how regional SIC is recorded in the ice-sheet stratigraphy. Over the period 2002-2010 we find that the ice-sheet chemistry is significantly correlated with SIC variability within the AS and Pine Island Bay polynyas. Based on this result, we evaluate the use of ice-core chemistry as a proxy for interannual polynya variability in this region, one of the largest and most persistent polynya areas in Antarctica. MSA concentrations correlate strongly with summer SIC within the polynya regions, consistent with MSA at this site being derived from marine biological productivity during the spring and summer. Cl- concentrations correlate strongly with winter SIC within the polynyas as well as some regions outside the polynyas, consistent with Cl- at this site originating primarily from winter sea-ice formation. Spatial correlations were generally insignificant outside of the polynya areas, with some notable exceptions. Ice-core glaciochemical records from this dynamic region thus may provide a proxy for reconstructing AS and Pine Island Bay polynya variability prior to the satellite era. © 2012. American Geophysical Union. All Rights Reserved. |
format |
Text |
author |
Criscitiello, Alison S. Das, Sarah B. Evans, Matthew J. Frey, Karen E. Conway, Howard Joughin, Ian Medley, Brooke Steig, Eric J. |
author_facet |
Criscitiello, Alison S. Das, Sarah B. Evans, Matthew J. Frey, Karen E. Conway, Howard Joughin, Ian Medley, Brooke Steig, Eric J. |
author_sort |
Criscitiello, Alison S. |
title |
Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
title_short |
Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
title_full |
Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
title_fullStr |
Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
title_full_unstemmed |
Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica |
title_sort |
ice sheet record of recent sea-ice behavior and polynya variability in the amundsen sea, west antarctica |
publisher |
Clark Digital Commons |
publishDate |
2013 |
url |
https://commons.clarku.edu/faculty_geography/229 https://doi.org/10.1029/2012JC008077 https://commons.clarku.edu/context/faculty_geography/article/1228/viewcontent/GeoFacWorks_Frey_IceSheet_2013.pdf |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Amundsen Sea Island Bay Pine Island Bay West Antarctica |
geographic_facet |
Amundsen Sea Island Bay Pine Island Bay West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica ice core Ice Sheet Pine Island Pine Island Bay Sea ice West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica ice core Ice Sheet Pine Island Pine Island Bay Sea ice West Antarctica |
op_source |
Geography |
op_relation |
https://commons.clarku.edu/faculty_geography/229 doi:10.1029/2012JC008077 https://commons.clarku.edu/context/faculty_geography/article/1228/viewcontent/GeoFacWorks_Frey_IceSheet_2013.pdf |
op_doi |
https://doi.org/10.1029/2012JC008077 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
1 |
container_start_page |
118 |
op_container_end_page |
130 |
_version_ |
1776196966881951744 |