DOI: 10.1002/2016JD025923
论文题名: Interpreting millimeter-wave radiances over tropical convective clouds
作者: Haddad Z.S. ; Sawaya R.C. ; Kacimi S. ; Sy O.O. ; Turk F.J. ; Steward J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 1650
结束页码: 1664
语种: 英语
英文关键词: convection
; microwave
; millimeter-wavelength
Scopus关键词: atmospheric convection
; atmospheric moisture
; cloud microphysics
; convective cloud
; data assimilation
; data interpretation
; hydrometeorology
; radar
; radiance
; radiometer
; remote sensing
; spatial resolution
; tropical meteorology
; wavelength
英文摘要: Attempts to interpret the measurements of millimeter-wave radiometers over tropical storms must overcome the difficulty of modeling the scattering signatures of hydrometeors at these frequencies. Most approaches to date try to retrieve surface precipitation, to which the observations are not directly sensitive. In fact, millimeter wavelengths are most sensitive to the scattering from solid hydrometeors within the upper levels of the cloud. Millimeter-wavelength radiometers have a definite advantage over the lower frequency radiometers in that they have finer spatial resolution to resolve deep convection. Preliminary analyses summarized here indicate that the measurements are indeed sensitive to the depth and intensity of convection. The challenge is to derive a robust approach to make quantitative estimates of the characteristics of the convection directly from the observations, and conversely to derive a robust forward representation of the dependence of the radiances on the underlying moisture fields, to enable effective data assimilation. This is accomplished using a two-step semiempirical approach: first, nearly simultaneous coincident observations by millimeter-wave radiometers and orbiting atmospheric profiling radars are used to enforce unbiased consistency between modeled brightness temperatures and radar and radiometer observations; second, the departure from the first-step mean empirical relations are explained in terms of the moisture variables, using cloud-resolving simulations with different microphysical schemes, including an original microphysical representation that proves to be more consistent with remote sensing observations than existing schemes. The results are a retrieval approach and a forward representation that are unbiased by construction, with uncertainties quantified by the corresponding conditional variances. ©2017. 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/62706
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: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, CA, United States; Department of Physics, University of California, Irvine, Irvine, CA, United States
Recommended Citation:
Haddad Z.S.,Sawaya R.C.,Kacimi S.,et al. Interpreting millimeter-wave radiances over tropical convective clouds[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)