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Journal Articles Geophysical Research Letters Year : 2020

Raindrop Signature from Microwave Radiometer Over Deserts

Yalei You
  • Function : Author
S. Joseph Munchak
  • Function : Author
Ralph Ferraro
  • Function : Author
Karen Mohr
  • Function : Author
Christa Peters-Lidard
Sarah Ringerud
  • Function : Author
Scott Rudlosky
  • Function : Author
Heshun Wang
  • Function : Author
Hamidreza Norouzi
  • Function : Author
Satya Prakash
  • Function : Author

Abstract

Rainfall estimates from spaceborne microwave radiometers form the foundation of global precipitation data sets. Since the beginning of the satellite microwave rainfall estimation era in the 1980s, the primary signature leveraged over land for these estimates has been the brightness temperature (TB) depression due to ice particle scattering. Contrary to this practice, time series analyses based on observations from two spaceborne radars and two spaceborne radiometers reveal a TB increase at H19 due to raindrop emission as the primary cloud particle signature over desert terrain. Low surface emissivity supports the use of liquid raindrop emission as the primary signature over desert surfaces. In these regions, the surface rain rate better correlates with the liquid raindrop emission signal than with the scattering induced by ice further aloft, suggesting a new potential for improving rainfall estimation over deserts by exploiting the liquid raindrop emission signature.
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hal-03045700 , version 1 (23-02-2023)

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Yalei You, S. Joseph Munchak, Ralph Ferraro, Karen Mohr, Christa Peters-Lidard, et al.. Raindrop Signature from Microwave Radiometer Over Deserts. Geophysical Research Letters, 2020, 47 (16), ⟨10.1029/2020GL088656⟩. ⟨hal-03045700⟩
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