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Performance of high resolution (400 m) PM2.5 forecast over Delhi.
- Source :
- Scientific Reports; 2/18/2021, Vol. 11 Issue 1, p1-9, 9p
- Publication Year :
- 2021
-
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 PM<subscript>2.5</subscript> observations improves the initial condition for surface PM<subscript>2.5</subscript> by about 45 µg/m<superscript>3</superscript> (about 50%).The accuracy of the forecast degrades slightly with lead time as mean bias increase from + 2.5 µg/m<superscript>3</superscript> on the first day to − 17 µg/m<superscript>3</superscript> on the third day of forecast. Our forecast is found to be very skillful both for PM<subscript>2.5</subscript> concentration and unhealthy/ very unhealthy air quality index categories, and has been helping the decision-makers in Delhi make informed decisions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20452322
- Volume :
- 11
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Scientific Reports
- Publication Type :
- Academic Journal
- Accession number :
- 148841586
- Full Text :
- https://doi.org/10.1038/s41598-021-83467-8