Abstract
This paper investigates the impacts on aerosol characteristics, optical and radiative properties due to a mesoscale dust storm which originated from the Arabian, Iran/Pakistan region and observed to pass in vicinity over the semiarid region of Western India in April, 2017. The extent and long-distance transport of dust along with varying aerosol optical depth (AOD) were studied with high spatial and temporal resolution space-based observations. In situ measurements of particulate matter (PM) indicated high dust loading with PM10 and PM2.5 concentrations as high as 223 and 253 µg/m3 and 142.6 and 160 µg/m3, respectively. High concentrations of Inhalable, thoracic and alveolic PM aerosols (~ 290, 200 and 100 µg/m3, respectively) are also observed due to high dust load in the atmosphere, that is hazardous to human health, particularly for people suffering from respiratory ailments. The fine-mode fraction and Angstrom exponent have also been analyzed using satellite data. Satellite-derived AOD and in situ meteorological data were used as model inputs to estimate the radiative forcing impact of dust aerosols using a coupled radiative transfer model. The radiative transfer model simulations results indicate a reduction in the total downward surface flux by 6.5%, 6.7%, 5.0%, 10.1%, 7.1%, 8.9%, 3.7% and 5.3% as height decreases from 5 to 0 km (surface) during pre- to post-dust storm event period, respectively. The aerosols vertical profiles obtained from spaceborne CALIPSO LiDAR validated the predominant presence of “dust” aerosols during this event. The study provides important quantitative insights into extreme variabilities in aerosol properties resulting to a “cooling effect” during a severe mesoscale dust storm event over a semiarid region.
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Acknowledgements
This study is a part of ‘Urban Air Quality Assessment using Remote Sensing and GIS’ project supported under the Earth Observations and Applications Mission (EOAM) program of ISRO. Abha Chhabra is thankful to Director SAC, and Deputy Director, EPSA/SAC for their support and encouragement during the course of the study. Authors gratefully acknowledge Dr. Zhonghai Jin, NASA and his team for the availability of online COART model and NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website (https://www.ready.noaa.gov) used in this publication. Authors also thankfully acknowledge the editorial team and anonymous reviewers for their comments and suggestions towards improving the manuscript. Authors are thankful to Dr. Rajesh Iyer, St. Xavier’s College, Ahmedabad for his support towards field measurements required for the study.
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Chhabra, A., Turakhia, T. & Chauhan, P. Impacts of a Mesoscale Dust Storm on Aerosols Characteristics, Optical and Radiative Properties Over a Semiarid Region, Western India. J Indian Soc Remote Sens 49, 2133–2141 (2021). https://doi.org/10.1007/s12524-021-01313-w
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DOI: https://doi.org/10.1007/s12524-021-01313-w