Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 118 (2013): 118–130, doi:10.1029/2012JC008077. Our understandi...
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Language: | English |
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John Wiley & Sons
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Online Access: | https://hdl.handle.net/1912/5920 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5920 2023-05-15T13:23:50+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. 2013-01-25 application/pdf https://hdl.handle.net/1912/5920 en_US eng John Wiley & Sons https://doi.org/10.1029/2012JC008077 Journal of Geophysical Research 118 (2013): 118–130 https://hdl.handle.net/1912/5920 doi:10.1029/2012JC008077 Journal of Geophysical Research 118 (2013): 118–130 doi:10.1029/2012JC008077 Sea ice Polynyas Antarctica Amundsen Sea Pine Island Bay Methanesulfonic acid Article 2013 ftwhoas https://doi.org/10.1029/2012JC008077 2022-05-28T22:58:49Z Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 118 (2013): 118–130, doi:10.1029/2012JC008077. 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. This research was supported by an award ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica ice core Ice Sheet Pine Island Pine Island Bay Sea ice West Antarctica Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) West Antarctica 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) Journal of Geophysical Research: Oceans 118 1 118 130 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Sea ice Polynyas Antarctica Amundsen Sea Pine Island Bay Methanesulfonic acid |
spellingShingle |
Sea ice Polynyas Antarctica Amundsen Sea Pine Island Bay Methanesulfonic acid 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 |
Sea ice Polynyas Antarctica Amundsen Sea Pine Island Bay Methanesulfonic acid |
description |
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 118 (2013): 118–130, doi:10.1029/2012JC008077. 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. This research was supported by an award ... |
format |
Article in Journal/Newspaper |
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 |
John Wiley & Sons |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/5920 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
West Antarctica Amundsen Sea Island Bay Pine Island Bay |
geographic_facet |
West Antarctica Amundsen Sea Island Bay Pine Island Bay |
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 |
Journal of Geophysical Research 118 (2013): 118–130 doi:10.1029/2012JC008077 |
op_relation |
https://doi.org/10.1029/2012JC008077 Journal of Geophysical Research 118 (2013): 118–130 https://hdl.handle.net/1912/5920 doi:10.1029/2012JC008077 |
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_ |
1766375652688134144 |