TY - JOUR
T1 - Strengthened Indian Summer Monsoon Precipitation Susceptibility Linked to Dust-Induced Ice Cloud Modification
AU - Patel, Piyushkumar N.
AU - Gautam, Ritesh
AU - Michibata, Takuro
AU - Gadhavi, Harish
N1 - Funding Information:
This work is supported by Physical Research Laboratory, Ahmedabad. The authors would like to express their gratitude to the CALIPSO (https://eosweb.larc.nasa.gov/), CERES (https://ceres.larc.nasa.gov/), CloudSat (http://www.cloudsat.cira.colostate.edu/), MODIS (http://ladsweb.nascom.nasa.gov/), and TRMM (https://pmm.nasa.gov/) science teams for the provision of publicly available data sets. We also thank ECMWF for providing ERA-Interim (http://apps.ecmwf.int/datasets/data/interim-full-daily/) reanalysis data used in our work. Comments from two anonymous reviewers are greatly appreciated in helping improve an earlier version of the manuscript.
Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.
PY - 2019
Y1 - 2019
N2 - A growing body of research has underscored the radiative impact of mineral dust in influencing Indian summer monsoon rainfall variability. However, the various aerosol-cloud-precipitation interaction mechanisms remain poorly understood. Here we analyze multisatellite observations to examine dust-induced modification in ice clouds and precipitation susceptibility. We show contrasting dust-induced changes in ice cloud regimes wherein despite a 25% reduction in ice particle radius in thin ice clouds, we find ~40% increase in ice particle radius and ice water path in thick ice clouds resulting in the cloud deepening and subsequently strengthened precipitation susceptibility, under strong updraft regimes. The observed dust-ice cloud-precipitation interactions are supported by a strong correlation between the interannual monsoon rainfall variability and dust frequency. This microphysical-dynamical coupling appears to provide negative feedback to aerosol-cloud interactions, which acts to buffer enhanced aerosol wet scavenging. Our results underscore the importance of incorporating meteorological regime-dependent dust-ice cloud-precipitation interactions in climate simulations.
AB - A growing body of research has underscored the radiative impact of mineral dust in influencing Indian summer monsoon rainfall variability. However, the various aerosol-cloud-precipitation interaction mechanisms remain poorly understood. Here we analyze multisatellite observations to examine dust-induced modification in ice clouds and precipitation susceptibility. We show contrasting dust-induced changes in ice cloud regimes wherein despite a 25% reduction in ice particle radius in thin ice clouds, we find ~40% increase in ice particle radius and ice water path in thick ice clouds resulting in the cloud deepening and subsequently strengthened precipitation susceptibility, under strong updraft regimes. The observed dust-ice cloud-precipitation interactions are supported by a strong correlation between the interannual monsoon rainfall variability and dust frequency. This microphysical-dynamical coupling appears to provide negative feedback to aerosol-cloud interactions, which acts to buffer enhanced aerosol wet scavenging. Our results underscore the importance of incorporating meteorological regime-dependent dust-ice cloud-precipitation interactions in climate simulations.
KW - aerosol-cloud-precipitation interactions
KW - cloud invigoration
KW - dust-ice cloud interactions
KW - dynamical feedback
KW - Indian Monsoon
KW - satellite remote sensing
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U2 - 10.1029/2018GL081634
DO - 10.1029/2018GL081634
M3 - Article
AN - SCOPUS:85068753253
SN - 0094-8276
VL - 46
SP - 8431
EP - 8441
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 14
ER -