DOI: 10.1002/2015JD023430
论文题名: A prototype physical database for passive microwave retrievals of precipitation over the US Southern Great Plains
作者: Ringerud S. ; Kummerow C.D. ; Peters-Lidard C.D.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期: 19 起始页码: 10465
结束页码: 10482
语种: 英语
英文关键词: emissivity
; passive microwave
; precipitation
; remote sensing
Scopus关键词: brightness temperature
; database
; emissivity
; empirical analysis
; error analysis
; feasibility study
; land surface
; microwave imagery
; precipitation (climatology)
; remote sensing
; top of atmosphere
; TRMM
; Great Plains
英文摘要: An accurate understanding of the instantaneous, dynamic land surface emissivity is necessary for a physically based, multi-channel passive microwave precipitation retrieval scheme over land. In an effort to assess the feasibility of the physical approach for land surfaces, a semi-empirical emissivity model is applied for calculation of the surface component in a test area of the US Southern Great Plains. A physical emissivity model, using land surface model data as input, is used to calculate emissivity at the 10 GHz frequency, combining contributions from the underlying soil and vegetation layers, including the dielectric and roughness effects of each medium. An empirical technique is then applied, based upon a robust set of observed channel covariances, extending the emissivity calculations to all channels. For calculation of the hydrometeor contribution, reflectivity profiles from the Tropical Rainfall Measurement Mission Precipitation Radar (TRMM PR) are utilized along with coincident brightness temperatures (Tbs) from the TRMM Microwave Imager (TMI), and cloud-resolving model profiles. Ice profiles are modified to be consistent with the higher frequency microwave Tbs. Resulting modeled top of the atmosphere Tbs show correlations to observations of 0.9, biases of 1K or less, root-mean-square errors on the order of 5K, and improved agreement over the use of climatological emissivity values. The synthesis of these models and data sets leads to the creation of a simple prototype Tb database that includes both dynamic surface and atmospheric information physically consistent with the land surface model, emissivity model, and atmospheric information. ©2015. 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/62972
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: NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Ringerud S.,Kummerow C.D.,Peters-Lidard C.D.. A prototype physical database for passive microwave retrievals of precipitation over the US Southern Great Plains[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)