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Aerosol-induced intensification of cooling effect of clouds during Indian summer monsoon

Journal Article · · Nature Communications
 [1];  [2];  [3];  [2];  [4]
  1. Indian Inst. of Technology (IIT), Kanpur (India); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Hyderabad, Telangana (India)
  3. Indian Inst. of Technology (IIT), Kanpur (India)
  4. Indian Inst. of Technology (IIT), Delhi, New Delhi (India)
Measurements and models show that enhanced aerosol concentrations can modify macro- and micro-physical properties of clouds. Here, we examine the effect of aerosols on continental mesoscale convective cloud systems during the Indian summer monsoon and find that these aerosol–cloud interactions have a net cooling effect at the surface and the top-of-atmosphere. Long-term (2002–2016) satellite data provide evidence of aerosol-induced cloud invigoration effect (AIvE) during the Indian summer monsoon. The AIvE leads to enhanced formation of thicker stratiform anvil clouds at higher altitudes. These AIvE-induced stratiform anvil clouds are also relatively brighter because of the presence of smaller sized ice particles. As a result, AIvE-induced increase in shortwave cloud radiative forcing is much larger than longwave cloud radiative forcing leading to the intensified net cooling effect of clouds over the Indian summer monsoon region. Such aerosol-induced cooling could subsequently decrease the surface diurnal temperature range and have significant feedbacks on lower tropospheric turbulence in a warmer and polluted future scenario.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Government of India; USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1691458
Report Number(s):
PNNL-SA--140935
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Recent Increase in Winter Hazy Days over Central India and the Arabian Sea journal November 2019
Strengthened Indian Summer Monsoon Precipitation Susceptibility Linked to Dust‐Induced Ice Cloud Modification journal July 2019
Modeling of the Effects of Wintertime Aerosols on Boundary Layer Properties Over the Indo Gangetic Plain journal April 2019
Land Cover Regulates the Spatial Variability of Temperature Response to the Direct Radiative Effect of Aerosols journal August 2019
Large contribution of meteorological factors to inter-decadal changes in regional aerosol optical depth journal January 2019
Aerosol–cloud closure study on cloud optical properties using remotely piloted aircraft measurements during a BACCHUS field campaign in Cyprus journal January 2019

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