Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019)
Surface melting is a major component of the Greenland ice sheet surface mass balance, and it affects sea level rise through direct runoff and the modulation of ice dynamics and hydrological processes, supraglacially, englacially and subglacially. Passive microwave (PMW) brightness temperature observ...
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Online Access: | http://hdl.handle.net/11379/549576 https://doi.org/10.5194/tc-15-2623-2021 https://tc.copernicus.org/articles/15/2623/2021/ |
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ftunivbrescia:oai:iris.unibs.it:11379/549576 2024-09-09T19:43:03+00:00 Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) Colosio P. Tedesco M. Ranzi R. Fettweis X. Colosio P. Tedesco M. Ranzi R. Fettweis X. 2021 ELETTRONICO http://hdl.handle.net/11379/549576 https://doi.org/10.5194/tc-15-2623-2021 https://tc.copernicus.org/articles/15/2623/2021/ eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000662226300001 volume:15 issue:6 firstpage:2623 lastpage:2646 numberofpages:24 journal:THE CRYOSPHERE http://hdl.handle.net/11379/549576 doi:10.5194/tc-15-2623-2021 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85107904586 https://tc.copernicus.org/articles/15/2623/2021/ info:eu-repo/semantics/openAccess CRYOSPHERE CLIMATE CHANGE SNOW SSM/I SEA LEVEL RISE info:eu-repo/semantics/article 2021 ftunivbrescia https://doi.org/10.5194/tc-15-2623-2021 2024-06-18T12:28:50Z Surface melting is a major component of the Greenland ice sheet surface mass balance, and it affects sea level rise through direct runoff and the modulation of ice dynamics and hydrological processes, supraglacially, englacially and subglacially. Passive microwave (PMW) brightness temperature observations are of paramount importance in studying the spatial and temporal evolution of surface melting due to their long temporal coverage (1979-present) and high temporal resolution (daily). However, a major limitation of PMW datasets has been the relatively coarse spatial resolution, which has historically been of the order of tens of kilometers. Here, we use a newly released PMW dataset (37 GHz, horizontal polarization) made available through a NASA "Making Earth System Data Records for Use in Research Environments"(MeASUREs) program to study the spatiotemporal evolution of surface melting over the Greenland ice sheet at an enhanced spatial resolution of 3.125 km. We assess the outputs of different detection algorithms using data collected by automatic weather stations (AWSs) and the outputs of the Modèle Atmosphérique Régional (MAR) regional climate model. We found that sporadic melting is well captured using a dynamic algorithm based on the outputs of the Microwave Emission Model of Layered Snowpack (MEMLS), whereas a fixed threshold of 245 K is capable of detecting persistent melt. Our results indicate that, during the reference period from 1979 to 2019 (from 1988 to 2019), surface melting over the ice sheet increased in terms of both duration, up to 4.5 (2.9) d per decade, and extension, up to 6.9 % (3.6 %) of the entire ice sheet surface extent per decade, according to the MEMLS algorithm. Furthermore, the melting season started up to 4.0 (2.5) d earlier and ended 7.0 (3.9) d later per decade. We also explored the information content of the enhanced-resolution dataset with respect to the one at 25 km and MAR outputs using a semi-variogram approach. We found that the enhanced product is more sensitive to ... Article in Journal/Newspaper Greenland Ice Sheet Università degli Studi di Brescia: OPENBS - Open Archive UniBS Greenland The Cryosphere 15 6 2623 2646 |
institution |
Open Polar |
collection |
Università degli Studi di Brescia: OPENBS - Open Archive UniBS |
op_collection_id |
ftunivbrescia |
language |
English |
topic |
CRYOSPHERE CLIMATE CHANGE SNOW SSM/I SEA LEVEL RISE |
spellingShingle |
CRYOSPHERE CLIMATE CHANGE SNOW SSM/I SEA LEVEL RISE Colosio P. Tedesco M. Ranzi R. Fettweis X. Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
topic_facet |
CRYOSPHERE CLIMATE CHANGE SNOW SSM/I SEA LEVEL RISE |
description |
Surface melting is a major component of the Greenland ice sheet surface mass balance, and it affects sea level rise through direct runoff and the modulation of ice dynamics and hydrological processes, supraglacially, englacially and subglacially. Passive microwave (PMW) brightness temperature observations are of paramount importance in studying the spatial and temporal evolution of surface melting due to their long temporal coverage (1979-present) and high temporal resolution (daily). However, a major limitation of PMW datasets has been the relatively coarse spatial resolution, which has historically been of the order of tens of kilometers. Here, we use a newly released PMW dataset (37 GHz, horizontal polarization) made available through a NASA "Making Earth System Data Records for Use in Research Environments"(MeASUREs) program to study the spatiotemporal evolution of surface melting over the Greenland ice sheet at an enhanced spatial resolution of 3.125 km. We assess the outputs of different detection algorithms using data collected by automatic weather stations (AWSs) and the outputs of the Modèle Atmosphérique Régional (MAR) regional climate model. We found that sporadic melting is well captured using a dynamic algorithm based on the outputs of the Microwave Emission Model of Layered Snowpack (MEMLS), whereas a fixed threshold of 245 K is capable of detecting persistent melt. Our results indicate that, during the reference period from 1979 to 2019 (from 1988 to 2019), surface melting over the ice sheet increased in terms of both duration, up to 4.5 (2.9) d per decade, and extension, up to 6.9 % (3.6 %) of the entire ice sheet surface extent per decade, according to the MEMLS algorithm. Furthermore, the melting season started up to 4.0 (2.5) d earlier and ended 7.0 (3.9) d later per decade. We also explored the information content of the enhanced-resolution dataset with respect to the one at 25 km and MAR outputs using a semi-variogram approach. We found that the enhanced product is more sensitive to ... |
author2 |
Colosio P. Tedesco M. Ranzi R. Fettweis X. |
format |
Article in Journal/Newspaper |
author |
Colosio P. Tedesco M. Ranzi R. Fettweis X. |
author_facet |
Colosio P. Tedesco M. Ranzi R. Fettweis X. |
author_sort |
Colosio P. |
title |
Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
title_short |
Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
title_full |
Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
title_fullStr |
Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
title_full_unstemmed |
Surface melting over the Greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
title_sort |
surface melting over the greenland ice sheet derived from enhanced resolution passive microwave brightness temperatures (1979-2019) |
publishDate |
2021 |
url |
http://hdl.handle.net/11379/549576 https://doi.org/10.5194/tc-15-2623-2021 https://tc.copernicus.org/articles/15/2623/2021/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000662226300001 volume:15 issue:6 firstpage:2623 lastpage:2646 numberofpages:24 journal:THE CRYOSPHERE http://hdl.handle.net/11379/549576 doi:10.5194/tc-15-2623-2021 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85107904586 https://tc.copernicus.org/articles/15/2623/2021/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-15-2623-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
6 |
container_start_page |
2623 |
op_container_end_page |
2646 |
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1809912402068635648 |