Atmospheric drivers of Greenland surface melt revealed by self-organizing maps
Recent acceleration in surface melt on the Greenland ice sheet (GrIS) has occurred concurrently with a rapidly warming Arctic and has been connected to persistent, anomalous atmospheric circulation patterns over Greenland. To identify synoptic setups favoring enhanced GrIS surface melt and their dec...
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ftdatacite:10.7916/d88p7c2h 2023-05-15T14:54:50+02:00 Atmospheric drivers of Greenland surface melt revealed by self-organizing maps Mioduszewski, J. Rennermalm, A. K. Hammann, A. Tedesco, Marco Noble, E. U. Stroeve, J. C. Mote, T. L. 2016 https://dx.doi.org/10.7916/d88p7c2h https://academiccommons.columbia.edu/doi/10.7916/D88P7C2H unknown Columbia University https://dx.doi.org/10.1002/2015jd024550 Climatic changes Synoptic climatology Ice sheets Atmospheric thermodynamics Text Articles article-journal ScholarlyArticle 2016 ftdatacite https://doi.org/10.7916/d88p7c2h https://doi.org/10.1002/2015jd024550 2021-11-05T12:55:41Z Recent acceleration in surface melt on the Greenland ice sheet (GrIS) has occurred concurrently with a rapidly warming Arctic and has been connected to persistent, anomalous atmospheric circulation patterns over Greenland. To identify synoptic setups favoring enhanced GrIS surface melt and their decadal changes, we develop a summer Arctic synoptic climatology by employing self-organizing maps. These are applied to daily 500 hPa geopotential height fields obtained from the Modern Era Retrospective Analysis for Research and Applications reanalysis, 1979–2014. Particular circulation regimes are related to meteorological conditions and GrIS surface melt estimated with outputs from the Modèle Atmosphérique Régional. Our results demonstrate that the largest positive melt anomalies occur in concert with positive height anomalies near Greenland associated with wind, temperature, and humidity patterns indicative of strong meridional transport of heat and moisture. We find an increased frequency in a 500 hPa ridge over Greenland coinciding with a 63% increase in GrIS melt between the 1979–1988 and 2005–2014 periods, with 75.0% of surface melt changes attributed to thermodynamics, 17% to dynamics, and 8.0% to a combination. We also confirm that the 2007–2012 time period has the largest dynamic forcing relative of any period but also demonstrate that increased surface energy fluxes, temperature, and moisture separate from dynamic changes contributed more to melt even during this period. This implies that GrIS surface melt is likely to continue to increase in response to an ever warmer future Arctic, regardless of future atmospheric circulation patterns. Text Arctic Greenland Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Arctic Greenland |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Climatic changes Synoptic climatology Ice sheets Atmospheric thermodynamics |
spellingShingle |
Climatic changes Synoptic climatology Ice sheets Atmospheric thermodynamics Mioduszewski, J. Rennermalm, A. K. Hammann, A. Tedesco, Marco Noble, E. U. Stroeve, J. C. Mote, T. L. Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
topic_facet |
Climatic changes Synoptic climatology Ice sheets Atmospheric thermodynamics |
description |
Recent acceleration in surface melt on the Greenland ice sheet (GrIS) has occurred concurrently with a rapidly warming Arctic and has been connected to persistent, anomalous atmospheric circulation patterns over Greenland. To identify synoptic setups favoring enhanced GrIS surface melt and their decadal changes, we develop a summer Arctic synoptic climatology by employing self-organizing maps. These are applied to daily 500 hPa geopotential height fields obtained from the Modern Era Retrospective Analysis for Research and Applications reanalysis, 1979–2014. Particular circulation regimes are related to meteorological conditions and GrIS surface melt estimated with outputs from the Modèle Atmosphérique Régional. Our results demonstrate that the largest positive melt anomalies occur in concert with positive height anomalies near Greenland associated with wind, temperature, and humidity patterns indicative of strong meridional transport of heat and moisture. We find an increased frequency in a 500 hPa ridge over Greenland coinciding with a 63% increase in GrIS melt between the 1979–1988 and 2005–2014 periods, with 75.0% of surface melt changes attributed to thermodynamics, 17% to dynamics, and 8.0% to a combination. We also confirm that the 2007–2012 time period has the largest dynamic forcing relative of any period but also demonstrate that increased surface energy fluxes, temperature, and moisture separate from dynamic changes contributed more to melt even during this period. This implies that GrIS surface melt is likely to continue to increase in response to an ever warmer future Arctic, regardless of future atmospheric circulation patterns. |
format |
Text |
author |
Mioduszewski, J. Rennermalm, A. K. Hammann, A. Tedesco, Marco Noble, E. U. Stroeve, J. C. Mote, T. L. |
author_facet |
Mioduszewski, J. Rennermalm, A. K. Hammann, A. Tedesco, Marco Noble, E. U. Stroeve, J. C. Mote, T. L. |
author_sort |
Mioduszewski, J. |
title |
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
title_short |
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
title_full |
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
title_fullStr |
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
title_full_unstemmed |
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps |
title_sort |
atmospheric drivers of greenland surface melt revealed by self-organizing maps |
publisher |
Columbia University |
publishDate |
2016 |
url |
https://dx.doi.org/10.7916/d88p7c2h https://academiccommons.columbia.edu/doi/10.7916/D88P7C2H |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_relation |
https://dx.doi.org/10.1002/2015jd024550 |
op_doi |
https://doi.org/10.7916/d88p7c2h https://doi.org/10.1002/2015jd024550 |
_version_ |
1766326589594796032 |