DOI: 10.1002/jgrd.50154
论文题名: Monitoring scan asymmetry of microwave humidity sounding channels using simultaneous all angle collocations (SAACs)
作者: John V.O. ; Holl G. ; Atkinson N. ; Buehler S.A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 3 起始页码: 1536
结束页码: 1545
语种: 英语
英文关键词: humidity sounder
; microwave
; scan asymmetry
Scopus关键词: Instruments
; Microwaves
; Data transmitter
; Humidity sounders
; Polar-orbiting satellites
; Radio frequency interference
; scan asymmetry
; Scientific analysis
; Time varying
; Satellites
; data transmission
; diurnal variation
; estimation method
; humidity
; microwave radiation
; satellite data
; satellite imagery
英文摘要: Simultaneous all angle collocations (SAACs) of microwave humidity sounders (AMSU-B and MHS) on-board polar orbiting satellites are used to estimate scan-dependent biases. This method has distinct advantages over previous methods, such as that the estimated scan-dependent biases are not influenced by diurnal differences between the edges of the scan and the biases can be estimated for both sides of the scan. We find the results are robust in the sense that biases estimated for one satellite pair can be reproduced by double differencing biases of these satellites with a third satellite. Channel 1 of these instruments shows the least bias for all satellites. Channel 2 has biases greater than 5 K, thus needs to be corrected. Channel 3 has biases of about 2 K and more and they are time varying for some of the satellites. Channel 4 has the largest bias which is about 15 K when the data are averaged for 5 years, but biases of individual months can be as large as 30 K. Channel 5 also has large and time varying biases for two of the AMSU-Bs. NOAA-15 (N15) channels are found to be affected the most, mainly due to radio frequency interference (RFI) from onboard data transmitters. Channel 4 of N15 shows the largest and time varying biases, so data of this channel should only be used with caution for climate applications. The two MHS instruments show the best agreement for all channels. Our estimates may be used to correct for scan-dependent biases of these instruments, or at least used as a guideline for excluding channels with large scan asymmetries from scientific analyses. ©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/63956
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Met Office Hadley Centre, Exeter, United Kingdom; Division of Space Technology, Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Kiruna, Sweden; Met Office, Exeter, United Kingdom
Recommended Citation:
John V.O.,Holl G.,Atkinson N.,et al. Monitoring scan asymmetry of microwave humidity sounding channels using simultaneous all angle collocations (SAACs)[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(3)