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Title: Significance of aerosol radiative effect in energy balance control on global precipitation change

Historical changes of global precipitation in the 20th century simulated by a climate model are investigated. The results simulated with alternate configurations of cloud microphysics are analyzed in the context of energy balance controls on global precipitation, where the latent heat changes associated with the precipitation change is nearly balanced with changes to atmospheric radiative cooling. The atmospheric radiative cooling is dominated by its clear-sky component, which is found to correlate with changes to both column water vapor and aerosol optical depth (AOD). The water vapor-dependent component of the clear-sky radiative cooling is then found to scale with global temperature change through the Clausius–Clapeyron relationship. This component results in a tendency of global precipitation increase with increasing temperature at a rate of approximately 2%K -1. Another component of the clear-sky radiative cooling, which is well correlated with changes to AOD, is also found to vary in magnitude among different scenarios with alternate configurations of cloud microphysics that controls the precipitation efficiency, a major factor influencing the aerosol scavenging process that can lead to different aerosol loadings. These results propose how different characteristics of cloud microphysics can cause different aerosol loadings that in turn perturb global energy balance to significantly changemore » global precipitation. This implies a possible coupling of aerosol–cloud interaction with aerosol–radiation interaction in the context of global energy balance.« less
 [1] ;  [2] ;  [3]
  1. Univ. of Tokyo, Kashiwa (Japan). Atmosphere and Ocean Research Inst.
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.; Univ. of Reading (United Kingdom). Dept. of Meteorology
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1530-261X
Grant/Contract Number:
AC52-07NA27344; NA15OAR4310153
Accepted Manuscript
Journal Name:
Atmospheric Science Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 10; Journal ID: ISSN 1530-261X
Royal Meteorological Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Tokyo, Kashiwa (Japan)
Sponsoring Org:
USDOE; National Oceanic and Atmospheric Administration (NOAA) (United States); National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; global energy balance; aerosol radiative effect; cloud microphysics; hydrologic sensitivity
OSTI Identifier: