Publication: Evaluation of MERRA-2 Total columnar ozone from ground based and AIRS satellite product
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Date
2022
Journal Title
2022 URSI Regional Conference on Radio Science, USRI-RCRS 2022
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers Inc.
Abstract
In the present study, a first systematic evaluation and analysis of long-term (2009-2020) gridded datasets (0. 5� � 0.625) of total columnar ozone (TCO) from Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2TCO) is carried out over the Indian subcontinent. The MERRA-2TCO is first validated with observed (IMDTCO) and then further compared with Atmospheric Infrared Sounder (AIRSTCO) satellite dataset. For an in-depth comparison and statistical analysis, the dataset has been segregated into seven distinct regions, i.e. Western Himalaya (WH), Northeast (NE), North Central (NC), Northwest (NW), West Peninsula India (WPI), East Peninsula India (EPI), and South Peninsula India (SPI). Descriptive statistics (NMSE, FB, R, FA2 and d) reveals significant correlation of MERRA-2TCO with IMDTCO over Delhi (NMSE=0.0013, FB=-0.029) and Varanasi (NMSE=0.0008, FB=-0.014) cities. Further, a comparison of MERRA-2TCO with AIRSTCO represents the NMSE values ranging from 0.0023-0.0047 DU and a correlation coefficient of 0.62-0.87 in different regions of India. In support of Brewer's circulation pattern, an increasing strong shift of columnar ozone from low (SPI) to high (WH) latitudinal regions in annual variation (2009-2020) is observed. Our finding indicate that the MERRA-2 ozone dataset can be effectively used for ozone air quality studies over the Indian regions and the analysis may highlight the necessity for independent, reliable, consistent, and accurate ozone observations. � 2022 International Radio Science Union (URSI).
Description
Keywords
AIRS, MERRA-2, Total column ozone, Validation