Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet
peer reviewed The increase in Greenland Ice Sheet (GrIS) surface runoff since the turn of the century has been linked to a rise in Greenland blocking frequency. However, a range of synoptic patterns can be considered blocked flow and efforts that summarize all blocking types indiscriminately likely...
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Online Access: | https://orbi.uliege.be/handle/2268/267938 https://doi.org/10.1029/2021JD035489 |
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ftorbi:oai:orbi.ulg.ac.be:2268/267938 2024-04-21T08:02:48+00:00 Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet Preece, J. Wachowicz, T. L. Mote, T. Tedesco, M. Fettweis, Xavier Sphères - SPHERES 2022-02-03 https://orbi.uliege.be/handle/2268/267938 https://doi.org/10.1029/2021JD035489 en eng Wiley https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JD035489 urn:issn:2169-897X urn:issn:2169-8996 https://orbi.uliege.be/handle/2268/267938 info:hdl:2268/267938 doi:10.1029/2021JD035489 scopus-id:2-s2.0-85125133101 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Journal of Geophysical Research. Atmospheres, 127 (2022-02-03) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2022 ftorbi https://doi.org/10.1029/2021JD035489 2024-03-27T14:55:34Z peer reviewed The increase in Greenland Ice Sheet (GrIS) surface runoff since the turn of the century has been linked to a rise in Greenland blocking frequency. However, a range of synoptic patterns can be considered blocked flow and efforts that summarize all blocking types indiscriminately likely fail to capture consequential differences in GrIS response. To account for these differences, we employ ERA5 reanalysis to identify summer blocking using two independent blocking metrics: the Greenland Blocking Index (GBI) and the blocking index of Pelly and Hoskins (2003). We then conduct a self-organizing map analysis to objectively classify synoptic conditions during Greenland blocking episodes and identify three primary blocking types: (1) a high-amplitude Omega block, (2) a lower-amplitude, stationary summer ridge, and (3) a cyclonic wave breaking pattern. Using Modèle Atmosphérique Régional output, we document the spatiotemporal progression of the surface energy and mass balance for each blocking type. Relative to all blocking episodes, summer ridge patterns produce more melt over the southern ice sheet, Omega blocks produce more melt across the northern ice sheet, and cyclonic wave breaking patterns produce more melt in northeast Greenland. Our results indicate that the recent trend in summer Greenland blocking was largely driven by an increase in Omega patterns and suggest that Omega blocks have played a central role in the recent acceleration of GrIS mass loss. Furthermore, the GBI exhibited a relative bias toward Omega patterns, which may help explain why it has measured stronger trends in summer Greenland blocking than other blocking metrics. Article in Journal/Newspaper Greenland Ice Sheet University of Liège: ORBi (Open Repository and Bibliography) Journal of Geophysical Research: Atmospheres 127 4 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Preece, J. Wachowicz, T. L. Mote, T. Tedesco, M. Fettweis, Xavier Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed The increase in Greenland Ice Sheet (GrIS) surface runoff since the turn of the century has been linked to a rise in Greenland blocking frequency. However, a range of synoptic patterns can be considered blocked flow and efforts that summarize all blocking types indiscriminately likely fail to capture consequential differences in GrIS response. To account for these differences, we employ ERA5 reanalysis to identify summer blocking using two independent blocking metrics: the Greenland Blocking Index (GBI) and the blocking index of Pelly and Hoskins (2003). We then conduct a self-organizing map analysis to objectively classify synoptic conditions during Greenland blocking episodes and identify three primary blocking types: (1) a high-amplitude Omega block, (2) a lower-amplitude, stationary summer ridge, and (3) a cyclonic wave breaking pattern. Using Modèle Atmosphérique Régional output, we document the spatiotemporal progression of the surface energy and mass balance for each blocking type. Relative to all blocking episodes, summer ridge patterns produce more melt over the southern ice sheet, Omega blocks produce more melt across the northern ice sheet, and cyclonic wave breaking patterns produce more melt in northeast Greenland. Our results indicate that the recent trend in summer Greenland blocking was largely driven by an increase in Omega patterns and suggest that Omega blocks have played a central role in the recent acceleration of GrIS mass loss. Furthermore, the GBI exhibited a relative bias toward Omega patterns, which may help explain why it has measured stronger trends in summer Greenland blocking than other blocking metrics. |
author2 |
Sphères - SPHERES |
format |
Article in Journal/Newspaper |
author |
Preece, J. Wachowicz, T. L. Mote, T. Tedesco, M. Fettweis, Xavier |
author_facet |
Preece, J. Wachowicz, T. L. Mote, T. Tedesco, M. Fettweis, Xavier |
author_sort |
Preece, J. |
title |
Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
title_short |
Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
title_full |
Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
title_fullStr |
Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
title_full_unstemmed |
Summer Greenland Blocking Diversity and its Impact on the Surface Mass Balance of the Greenland Ice Sheet |
title_sort |
summer greenland blocking diversity and its impact on the surface mass balance of the greenland ice sheet |
publisher |
Wiley |
publishDate |
2022 |
url |
https://orbi.uliege.be/handle/2268/267938 https://doi.org/10.1029/2021JD035489 |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Journal of Geophysical Research. Atmospheres, 127 (2022-02-03) |
op_relation |
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JD035489 urn:issn:2169-897X urn:issn:2169-8996 https://orbi.uliege.be/handle/2268/267938 info:hdl:2268/267938 doi:10.1029/2021JD035489 scopus-id:2-s2.0-85125133101 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2021JD035489 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
127 |
container_issue |
4 |
_version_ |
1796942891659034624 |