Performance of high resolution (400Â m) PM2.5 forecast over Delhi

Jena, C and Ghude, SD and Kumar, R and Debnath, S and Govardhan, G and Soni, VK and Kulkarni, SH and Beig, G and Nanjundiah, RS and Rajeevan, M (2021) Performance of high resolution (400Â m) PM2.5 forecast over Delhi. In: Scientific Reports, 11 (1).

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Abstract

This study reports a very high-resolution (400 m grid-spacing) operational air quality forecasting system developed to alert residents of Delhi and the National Capital Region (NCR) about forthcoming acute air pollution episodes. Such a high-resolution system has been developed for the first time and is evaluated during October 2019-February 2020. The system assimilates near real-time aerosol observations from in situ and space-borne platform in the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) to produce a 72-h forecast daily in a dynamical downscaling framework. The assimilation of aerosol optical depth and surface PM2.5 observations improves the initial condition for surface PM2.5 by about 45 µg/m3 (about 50).The accuracy of the forecast degrades slightly with lead time as mean bias increase from + 2.5 µg/m3 on the first day to � 17 µg/m3 on the third day of forecast. Our forecast is found to be very skillful both for PM2.5 concentration and unhealthy/ very unhealthy air quality index categories, and has been helping the decision-makers in Delhi make informed decisions. © 2021, The Author(s).

Item Type:	Journal Article
Publication:	Scientific Reports
Publisher:	Nature Research
Additional Information:	The copyright of this article belongs to Nature Research
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	11 Mar 2021 09:09
Last Modified:	11 Mar 2021 09:09
URI:	http://eprints.iisc.ac.in/id/eprint/68170

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