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Mapping of seasonal...
Mapping of seasonal freeze-thaw transitions across the pan-Arctic land and sea ice domains with satellite radar
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- Mortin, Jonas, 1981- (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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Schroder, T. M. (author)
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Hansen, A. Walloe (author)
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Holt, B. (author)
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McDonald, K. C. (author)
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 117, s. C08004-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- To monitor the pan-Arctic seasonal freeze-thaw transitions of the land surface and sea ice, we analyze daily backscatter data from satellite scatterometry to examine the time series on an annual basis by applying an optimal edge detection scheme, and iterate against an internal median climatology to mitigate unreasonable outliers. By applying this novel algorithm to resolution-enhanced QuikSCAT data from 1999 to 2009, we have mapped a decade of seasonal freeze-thaw transitions across the landmass and sea ice north of 60 degrees N at a spatial resolution better than 5 km. The data set has been validated against surface air temperature measurements and snow depth obtained from a distributed network of weather stations and drift buoys. Most retrieved timings from surface and QuikSCAT measurements agree to less than a week at thaw transition for both land and sea ice and at freeze transition for sea ice, indicating successful retrieval over a range of surface covers. While the spatial pattern of freeze-thaw transition changes substantially from year to year, the interannual variability of the mean transition timing over a particular surface is small.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Keyword
- active microwave
- cryosphere
- freeze-thaw
- pan-Arctic
- sea ice
- terrestrial
- atmosfärvetenskap och oceanografi
- Atmospheric Sciences and Oceanography
Publication and Content Type
- ref (subject category)
- art (subject category)
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