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Clear-sky biases in...
Clear-sky biases in satellite infrared estimates of upper tropospheric humidity and its trends
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- John, Viju O (author)
- Met Office Hadley Centre, Exeter
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- Holl, Gerrit (author)
- Luleå tekniska universitet,Rymdteknik
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- Allen, Richard P. (author)
- Department of Meteorology, University of Reading
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- Buehler, Stefan (author)
- Luleå tekniska universitet,Rymdteknik
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- Parker, David E. (author)
- Met Office Hadley Centre, Exeter
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- Soden, Brian J. (author)
- Rosenstiel School of Marine and Atmospheric Science, University of Miami
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 116
- 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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- We use microwave retrievals of upper tropospheric humidity (UTH) to estimate the impact of clear-sky-only sampling by infrared instruments on the distribution, variability, and trends in UTH. Our method isolates the impact of the clear-sky-only sampling, without convolving errors from other sources. On daily time scales, IR-sampled UTH contains large data gaps in convectively active areas, with only about 20-30 % of the tropics (30 degrees S-30 degrees N) being sampled. This results in a dry bias of about -9 % RH in the area-weighted tropical daily UTH time series. On monthly scales, maximum clear-sky bias (CSB) is up to -30 % RH over convectively active areas. The magnitude of CSB shows significant correlations with UTH itself (-0.5) and also with the variability in UTH (-0.6). We also show that IR-sampled UTH time series have higher interannual variability and smaller trends compared to microwave sampling. We argue that a significant part of the smaller trend results from the contrasting influence of diurnal drift in the satellite measurements on the wet and dry regions of the tropics.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
Keyword
- Space Technology
- Rymdteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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