DOI: 10.1002/jgrd.50840
论文题名: Calibration of Suomi national polar-orbiting partnership advanced technology microwave sounder
作者: Weng F. ; Zou X. ; Sun N. ; Yang H. ; Tian M. ; Blackwell W.J. ; Wang X. ; Lin L. ; Anderson K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11187
结束页码: 11200
语种: 英语
英文关键词: ATMS
; calibration
Scopus关键词: Antennas
; Computer simulation
; Efficiency
; Instruments
; Microwave acoustics
; Statistics
; Temperature
; Advanced technology microwave sounders
; ATMS
; Brightness temperatures
; Cross-track scanning
; Independent analysis
; Nonlinearity analysis
; Processing algorithms
; Radiometric calibrations
; Calibration
; accuracy assessment
; advanced technology
; air temperature
; algorithm
; atmospheric modeling
; brightness temperature
; calibration
; data set
; GPS
; nonlinearity
; radiometric method
; satellite imagery
; temporal analysis
英文摘要: The Suomi National Polar-Orbiting Partnership (NPP) satellite was launched on 28 October 2011 and carries the Advanced Technology Microwave Sounder (ATMS) on board. ATMS is a cross-track scanning instrument observing in 22 channels at frequencies ranging from 23 to 183 GHz, permitting the measurements of the atmospheric temperature and moisture under most weather conditions. In this study, the ATMS radiometric calibration algorithm used in the operational system is first evaluated through independent analyses of prelaunch thermal vacuum data. It is found that the ATMS peak nonlinearity for all the channels is less than 0.5 K, which is well within the specification. For the characterization of the ATMS instrument sensitivity or noise equivalent differential temperatures (NEDT), both standard deviation and Allan variance of warm counts are computed and compared. It is shown that NEDT derived from the standard deviation is about three to five times larger than that from the Allan variance. The difference results from a nonstationary component in the standard deviation of warm counts. The Allan variance is better suited than the standard deviation for describing NEDT. In the ATMS sensor brightness temperature data record (SDR) processing algorithm, the antenna gain efficiencies of main beam, cross-polarization beam, and side lobes must be derived accurately from the antenna gain distribution function. However, uncertainties remain in computing the efficiencies at ATMS high frequencies. Thus, ATMS antenna brightness temperature data records (TDR) at channels 1 to 15 are converted to SDR with the actual beam efficiencies whereas those for channels 16 to 22 are only corrected for the near-field sidelobe contributions. The biases of ATMS SDR measurements to the simulations are consistent between GPS RO and NWP data and are generally less than 0.5 K for those temperature-sounding channels where both the forward model and input atmospheric profiles are reliable. Key Points ATMS nonlinearity analysis Prelaunch and on-orbit assessments of absolute accuracy Analysis of ATMS instrument sensitivity ©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/63290
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: NOAA Center for Satellite Applications and Research, 5830 University Research Court, College Park, MD 20740, United States; Department of EOAS, Florida State University, Tallahassee FL, United States; ESSIC, University of Maryland, College Park MD, United States; Sensor Technology and System Applications, MIT Lincoln Laboratory, Lexington MA, United States; Center of Data Assimilation for Research and Application, Nanjing University of Information Science and Technology, Nanjing, China; Earth Resources Technology, Inc., Laurel MD, United States; Northrop Grumman Electronic System (NGES), Redondo Beach CA, United States
Recommended Citation:
Weng F.,Zou X.,Sun N.,et al. Calibration of Suomi national polar-orbiting partnership advanced technology microwave sounder[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)