Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures
[1] Persistent melting (e.g., continuing for more than three days or for one consecutive day and night) is mapped in Antarctica (1987–2006) using night- and day-time Special Sensor Microwave Imager brightness temperatures (Tb) at 19.35 GHz, horizontal polarization. Snowmelt is indicated when Tb and...
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American Geophysical Union
2007
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8MP535W 2023-05-15T13:41:09+02:00 Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures Tedesco, Marco Abdalati, W. Zwally, H. J. 2007 https://doi.org/10.7916/D8MP535W English eng American Geophysical Union https://doi.org/10.7916/D8MP535W Meltwater Runoff Ice sheets Climatic geomorphology Geology Geomorphology Climatic changes Articles 2007 ftcolumbiauniv https://doi.org/10.7916/D8MP535W 2019-04-04T08:14:19Z [1] Persistent melting (e.g., continuing for more than three days or for one consecutive day and night) is mapped in Antarctica (1987–2006) using night- and day-time Special Sensor Microwave Imager brightness temperatures (Tb) at 19.35 GHz, horizontal polarization. Snowmelt is indicated when Tb and relative daily difference exceed threshold values, respectively Tc and ΔT, computed for each pixel and year, or when both daytime and nighttime Tb exceed Tc. Results from an electromagnetic model suggest that the minimum detectable liquid water content ranges between 0.2 and 0.5%, in volume. We find that melting areas have been moving inland since 1987. A first-time extensive melting (1987–2006) is detected over the Transantarctic Mountains on January 2005, 875 Km inland and 2000 m above sea level. Melting extent and index have been decreasing over Antarctica, since 1987, although either positive and negative trends are observed from a sub-continental scale analysis. Article in Journal/Newspaper Antarc* Antarctica Columbia University: Academic Commons Transantarctic Mountains |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Meltwater Runoff Ice sheets Climatic geomorphology Geology Geomorphology Climatic changes |
spellingShingle |
Meltwater Runoff Ice sheets Climatic geomorphology Geology Geomorphology Climatic changes Tedesco, Marco Abdalati, W. Zwally, H. J. Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
topic_facet |
Meltwater Runoff Ice sheets Climatic geomorphology Geology Geomorphology Climatic changes |
description |
[1] Persistent melting (e.g., continuing for more than three days or for one consecutive day and night) is mapped in Antarctica (1987–2006) using night- and day-time Special Sensor Microwave Imager brightness temperatures (Tb) at 19.35 GHz, horizontal polarization. Snowmelt is indicated when Tb and relative daily difference exceed threshold values, respectively Tc and ΔT, computed for each pixel and year, or when both daytime and nighttime Tb exceed Tc. Results from an electromagnetic model suggest that the minimum detectable liquid water content ranges between 0.2 and 0.5%, in volume. We find that melting areas have been moving inland since 1987. A first-time extensive melting (1987–2006) is detected over the Transantarctic Mountains on January 2005, 875 Km inland and 2000 m above sea level. Melting extent and index have been decreasing over Antarctica, since 1987, although either positive and negative trends are observed from a sub-continental scale analysis. |
format |
Article in Journal/Newspaper |
author |
Tedesco, Marco Abdalati, W. Zwally, H. J. |
author_facet |
Tedesco, Marco Abdalati, W. Zwally, H. J. |
author_sort |
Tedesco, Marco |
title |
Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
title_short |
Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
title_full |
Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
title_fullStr |
Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
title_full_unstemmed |
Persistent surface snowmelt over Antarctica (1987–2006) from 19.35 GHz brightness temperatures |
title_sort |
persistent surface snowmelt over antarctica (1987–2006) from 19.35 ghz brightness temperatures |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://doi.org/10.7916/D8MP535W |
geographic |
Transantarctic Mountains |
geographic_facet |
Transantarctic Mountains |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://doi.org/10.7916/D8MP535W |
op_doi |
https://doi.org/10.7916/D8MP535W |
_version_ |
1766146156968017920 |