DOI: 10.1029/2012JD018545
论文题名: Correcting diurnal cycle aliasing in satellite microwave humidity sounder measurements
作者: Kottayil A. ; John V.O. ; Buehler S.A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 101
结束页码: 113
语种: 英语
英文关键词: diurnal cycle of humidity
; orbital drift correction
Scopus关键词: Atmospheric temperature
; Humidity sensors
; Microwave acoustic devices
; Oceanography
; Surface properties
; Advanced Microwave Sounding Unit-B
; Diurnal cycle
; Humidity measurements
; Long term data record
; Orbital drift
; Polar-orbiting satellites
; Surface temperature variation
; Surface temperatures
; Satellites
; air sampling
; amplitude
; AMSU
; atmospheric correction
; climate modeling
; diurnal variation
; humidity
; marine atmosphere
; microwave limb sounder
; NOAA satellite
; seasonal variation
; surface temperature
; Metopa
英文摘要: Microwave humidity measurements from polar orbiting satellites are affected by diurnal sampling biases which are caused by changes in the local observation time of the satellites. The long-term data records available from these satellites thus have spurious trends, which must be corrected. Diurnal cycles of the microwave measurements have been constructed by combining data over the period 2001-2010 from five different satellite platforms (NOAA-15, -16, -17, -18, and MetOpA). This climatological diurnal cycle has been used to deduce and correct the diurnal sampling bias in Advanced Microwave Sounding Unit-B and microwave humidity sounder measurements. Diurnal amplitudes for channels which are sensitive to surface temperature variations show a sharp land-sea contrast with the amplitudes exceeding 10 K for land regions but less than 1 K for oceanic regions. The humidity channels sensitive to the upper and middle troposphere exhibit a seasonal variation with large diurnal amplitudes over convective land regions (often above 3 K) in comparison to oceanic regions. The diurnal peak times of these channels over land occur in the early mornings. The diurnal sampling bias correction has a greater impact over land regions when compared to oceanic regions due to the large diurnal amplitudes over land. The diurnal cycle of humidity generated as a part of this study could be used to evaluate diurnal cycles in climate models. Key Points Climatological diurnal cycle of microwave humidity measurements Greater impact of diurnal correction seen over land regions than ocean A plausible trend in surface temperature after diurnal correction. © 2012 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/63965
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: Division of Space Technology, Department of Computer Science Electrical and Space Engineering, Luleå University of Technology, Kiruna, Sweden; Hadley Center, UK MetOffice, Exeter, United Kingdom
Recommended Citation:
Kottayil A.,John V.O.,Buehler S.A.. Correcting diurnal cycle aliasing in satellite microwave humidity sounder measurements[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)