DOI: 10.1002/jgrd.50358
论文题名: Assessment of intercalibration methods for satellite microwave humidity sounders
作者: John V.O. ; Allan R.P. ; Bell W. ; Buehler S.A. ; Kottayil A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4906
结束页码: 4918
语种: 英语
英文关键词: humidity
; inter-calibration
; microwave
Scopus关键词: Atmospheric humidity
; Calibration
; Microwaves
; Tropics
; Advanced Microwave Sounding Unit-B
; Brightness temperatures
; Diurnal variation
; Humidity sounders
; Intercalibration
; Natural targets
; Significant surfaces
; Tropical ocean
; Temperature
; AMSU
; cloud
; data set
; humidity
; nadir
; satellite
英文摘要: Three methods for intercalibrating humidity sounding channels are compared to assess their merits and demerits. The methods use the following: (1) natural targets (Antarctica and tropical oceans), (2) zonal average brightness temperatures, and (3) simultaneous nadir overpasses (SNOs). Advanced Microwave Sounding Unit-B instruments onboard the polar-orbiting NOAA 15 and NOAA 16 satellites are used as examples. Antarctica is shown to be useful for identifying some of the instrument problems but less promising for intercalibrating humidity sounders due to the large diurnal variations there. Owing to smaller diurnal cycles over tropical oceans, these are found to be a good target for estimating intersatellite biases. Estimated biases are more resistant to diurnal differences when data from ascending and descending passes are combined. Biases estimated from zonal-averaged brightness temperatures show large seasonal and latitude dependence which could have resulted from diurnal cycle aliasing and scene-radiance dependence of the biases. This method may not be the best for channels with significant surface contributions. We have also tested the impact of clouds on the estimated biases and found that it is not significant, at least for tropical ocean estimates. Biases estimated from SNOs are the least influenced by diurnal cycle aliasing and cloud impacts. However, SNOs cover only relatively small part of the dynamic range of observed brightness temperatures. Key PointsThree methods for inter-calibration are assessedDiurnal cycle aliasing is a main issueRadiance-dependent bias limits usage of SNOs ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63752
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Met Office Hadley Centre, FitzRoy Road, Exeter EX1 3PB, United Kingdom; Department of Meteorology, University of Reading, Berkshire, United Kingdom; Met Office, Exeter, United Kingdom; Lulea University of Technology, Kiruna, Sweden
Recommended Citation:
John V.O.,Allan R.P.,Bell W.,et al. Assessment of intercalibration methods for satellite microwave humidity sounders[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)