Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange
Landscape transitions between seasonally frozen and thawed conditions occur each year over roughly 50 million square kilometers of Earth’s Northern Hemisphere. These relatively abrupt transitions represent the closest analog to a biospheric and hydrologic on/off switch existing in nature, affecting...
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Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004
2006
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ftnasajpl:oai:trs.jpl.nasa.gov:2014/38995 2023-05-15T14:29:14+02:00 Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange McDonald, Kyle C. Kimball, John S. Zhao, Maosheng Njoku, Eni Zimmermann, Reiner Running, Steven W. 2006-04-03T16:18:07Z 499356 bytes application/pdf http://hdl.handle.net/2014/38995 en_US eng Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004 SPIE International Asia Pacific Environmental Remote Sensing Symposium, Honolulu, Hawaii, November 08, 2004. 04-3488 http://hdl.handle.net/2014/38995 remote sensing boreal arctic growing season freeze-thaw net primary products Special Sensor Microwave Imager (SSM/I) carbon cycle Preprint 2006 ftnasajpl 2021-12-23T13:18:15Z Landscape transitions between seasonally frozen and thawed conditions occur each year over roughly 50 million square kilometers of Earth’s Northern Hemisphere. These relatively abrupt transitions represent the closest analog to a biospheric and hydrologic on/off switch existing in nature, affecting surface meteorological conditions, ecological trace gas dynamics, energy exchange and hydrologic activity profoundly. We utilize time series satellite-borne microwave remote sensing measurements from the Special Sensor Microwave Imager (SSM/I) to examine spatial and temporal variability in seasonal freeze/thaw cycles for the pan-Arctic basin and Alaska. Regional measurements of spring thaw timing are derived using daily brightness temperature measurements from the 19 GHz, horizontally polarized channel, separately for overpasses with 6 AM and 6 PM equatorial crossing times. Spatial and temporal patterns in regional freeze/thaw dynamics show distinct differences between North America and Eurasia, and boreal forest and Arctic tundra biomes. Annual anomalies in the timing of thawing in spring also correspond closely to seasonal atmospheric CO2 concentration anomalies derived from NOAA CMDL arctic and subarctic monitoring stations. Classification differences between AM and PM overpass data average approximately 5 days for the region, though both appear to be effective surrogates for monitoring annual growing seasons at high latitudes. NASA/JPL Report Arctic Basin Arctic Subarctic Tundra Alaska JPL Technical Report Server Arctic |
institution |
Open Polar |
collection |
JPL Technical Report Server |
op_collection_id |
ftnasajpl |
language |
English |
topic |
remote sensing boreal arctic growing season freeze-thaw net primary products Special Sensor Microwave Imager (SSM/I) carbon cycle |
spellingShingle |
remote sensing boreal arctic growing season freeze-thaw net primary products Special Sensor Microwave Imager (SSM/I) carbon cycle McDonald, Kyle C. Kimball, John S. Zhao, Maosheng Njoku, Eni Zimmermann, Reiner Running, Steven W. Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
topic_facet |
remote sensing boreal arctic growing season freeze-thaw net primary products Special Sensor Microwave Imager (SSM/I) carbon cycle |
description |
Landscape transitions between seasonally frozen and thawed conditions occur each year over roughly 50 million square kilometers of Earth’s Northern Hemisphere. These relatively abrupt transitions represent the closest analog to a biospheric and hydrologic on/off switch existing in nature, affecting surface meteorological conditions, ecological trace gas dynamics, energy exchange and hydrologic activity profoundly. We utilize time series satellite-borne microwave remote sensing measurements from the Special Sensor Microwave Imager (SSM/I) to examine spatial and temporal variability in seasonal freeze/thaw cycles for the pan-Arctic basin and Alaska. Regional measurements of spring thaw timing are derived using daily brightness temperature measurements from the 19 GHz, horizontally polarized channel, separately for overpasses with 6 AM and 6 PM equatorial crossing times. Spatial and temporal patterns in regional freeze/thaw dynamics show distinct differences between North America and Eurasia, and boreal forest and Arctic tundra biomes. Annual anomalies in the timing of thawing in spring also correspond closely to seasonal atmospheric CO2 concentration anomalies derived from NOAA CMDL arctic and subarctic monitoring stations. Classification differences between AM and PM overpass data average approximately 5 days for the region, though both appear to be effective surrogates for monitoring annual growing seasons at high latitudes. NASA/JPL |
format |
Report |
author |
McDonald, Kyle C. Kimball, John S. Zhao, Maosheng Njoku, Eni Zimmermann, Reiner Running, Steven W. |
author_facet |
McDonald, Kyle C. Kimball, John S. Zhao, Maosheng Njoku, Eni Zimmermann, Reiner Running, Steven W. |
author_sort |
McDonald, Kyle C. |
title |
Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
title_short |
Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
title_full |
Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
title_fullStr |
Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
title_full_unstemmed |
Spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere CO2 exchange |
title_sort |
spaceborne microwave remote sensing of seasonal freeze-thaw processes in the terrestrial high latitudes : relationships with land-atmosphere co2 exchange |
publisher |
Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004 |
publishDate |
2006 |
url |
http://hdl.handle.net/2014/38995 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Basin Arctic Subarctic Tundra Alaska |
genre_facet |
Arctic Basin Arctic Subarctic Tundra Alaska |
op_relation |
SPIE International Asia Pacific Environmental Remote Sensing Symposium, Honolulu, Hawaii, November 08, 2004. 04-3488 http://hdl.handle.net/2014/38995 |
_version_ |
1766303298006024192 |