Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations
We propose a technique for monitoring snowmelt over the Greenland ice sheet between 1992 and 2005 based on the difference between ascending and descending brightness temperatures (DAV) measured either at 19.35- or 37- GHz by the Special Sensor Microwave Imager (SSM/I). Wet snow is detected when both...
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American Geophysical Union
2007
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8W66KPF 2023-05-15T16:27:26+02:00 Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations Tedesco, Marco 2007 https://doi.org/10.7916/D8W66KPF English eng American Geophysical Union https://doi.org/10.7916/D8W66KPF Climatic geomorphology Meltwater Runoff Ice sheets Hydrology Geology Geomorphology Climatic changes Articles 2007 ftcolumbiauniv https://doi.org/10.7916/D8W66KPF 2019-04-04T08:14:19Z We propose a technique for monitoring snowmelt over the Greenland ice sheet between 1992 and 2005 based on the difference between ascending and descending brightness temperatures (DAV) measured either at 19.35- or 37- GHz by the Special Sensor Microwave Imager (SSM/I). Wet snow is detected when both brightness temperatures and DAV values exceed fixed thresholds. Differently from existing techniques, a multi-frequency approach allows detection of wet snow at different depths and intensities, providing a tool for improving climatological and hydrological applications. Air temperature values either recorded by ground based stations or derived from model are used for calibrating and validating the technique. Results are compared with those obtained using backscattering coefficients recorded by the NASA's Quick Scatterometer (QuikSCAT) during an extreme melting event occurring on June 2002. Long-term results show that snowmelt extent has been increasing at a rate of ∼40,000 Km² per year for the past 14 years. Article in Journal/Newspaper Greenland Ice Sheet Columbia University: Academic Commons Greenland |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Climatic geomorphology Meltwater Runoff Ice sheets Hydrology Geology Geomorphology Climatic changes |
spellingShingle |
Climatic geomorphology Meltwater Runoff Ice sheets Hydrology Geology Geomorphology Climatic changes Tedesco, Marco Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
topic_facet |
Climatic geomorphology Meltwater Runoff Ice sheets Hydrology Geology Geomorphology Climatic changes |
description |
We propose a technique for monitoring snowmelt over the Greenland ice sheet between 1992 and 2005 based on the difference between ascending and descending brightness temperatures (DAV) measured either at 19.35- or 37- GHz by the Special Sensor Microwave Imager (SSM/I). Wet snow is detected when both brightness temperatures and DAV values exceed fixed thresholds. Differently from existing techniques, a multi-frequency approach allows detection of wet snow at different depths and intensities, providing a tool for improving climatological and hydrological applications. Air temperature values either recorded by ground based stations or derived from model are used for calibrating and validating the technique. Results are compared with those obtained using backscattering coefficients recorded by the NASA's Quick Scatterometer (QuikSCAT) during an extreme melting event occurring on June 2002. Long-term results show that snowmelt extent has been increasing at a rate of ∼40,000 Km² per year for the past 14 years. |
format |
Article in Journal/Newspaper |
author |
Tedesco, Marco |
author_facet |
Tedesco, Marco |
author_sort |
Tedesco, Marco |
title |
Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
title_short |
Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
title_full |
Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
title_fullStr |
Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
title_full_unstemmed |
Snowmelt detection over the Greenland ice sheet from SSM/I brightness temperature daily variations |
title_sort |
snowmelt detection over the greenland ice sheet from ssm/i brightness temperature daily variations |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://doi.org/10.7916/D8W66KPF |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://doi.org/10.7916/D8W66KPF |
op_doi |
https://doi.org/10.7916/D8W66KPF |
_version_ |
1766016603120467968 |