Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India
Abstract The first detailed validation of maximum temperature of Modern‐Era Retrospective analysis for Research and Application Version 2 (TMERRA‐2) against Indian Meteorological Department (TIMD) has been carried out for 35 years (1981–2015) over India. For this purpose, India has been divided into...
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doaj-0dfa9e669cfb4ceb8c98ad787a5289ba2020-11-25T01:15:33ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842020-01-0171n/an/a10.1029/2019EA000910Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over IndiaPriyanshu Gupta0Sunita Verma1R. Bhatla2Amit Singh Chandel3Janhavi Singh4Swagata Payra5Institute of Environment and Sustainable Development Banaras Hindu University Varanasi IndiaInstitute of Environment and Sustainable Development Banaras Hindu University Varanasi IndiaDepartment of Geophysics Banaras Hindu University Varanasi IndiaCenter of Environmental Sciences University of Allahabad Prayagraj IndiaInstitute of Environment and Sustainable Development Banaras Hindu University Varanasi IndiaDepartment of Physics Birla Institute of Technology Mesra Extension Centre Jaipur IndiaAbstract The first detailed validation of maximum temperature of Modern‐Era Retrospective analysis for Research and Application Version 2 (TMERRA‐2) against Indian Meteorological Department (TIMD) has been carried out for 35 years (1981–2015) over India. For this purpose, India has been divided into seven different zones, i.e Western Himalaya (WH), Northwest, North Central, Northeast (NE), West Peninsula India, East Peninsula India, and South Peninsula India. The descriptive statistics and correlation between TMERRA‐2 and TIMD have been determined for monthly, seasonal, and annual basis. A significant correlation (>0.9) has been found for monthly TMERRA‐2 and TIMD with a root‐mean‐square error value closer to 1 except for WH where a high root‐mean‐square error value of 18.2 is obtained. Seasonal analysis also indicates a significant correlation for all the zones except for WH and NE with a correlation value of <0.3 during monsoon season; this may be due to sparse network, cold climate, and heterogeneity due to topography. Percent bias indicates that TMERRA‐2 generally overestimates the TIMD monthly observations for all the zones, that is, Northwest, North Central, NE, West Peninsula India, East Peninsula India, and South Peninsula India by 4.1%, 2.4%, 1.6%, 0.5%, 0.2%, and 0.8%, respectively, except WH where an underestimation (−82.5%) is determined. Thus, after calibration, MERRA‐2 Reanalysis maximum temperature may be used for further study of extreme weather events.https://doi.org/10.1029/2019EA000910MERRA‐2validationRMSEPBIAS |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Priyanshu Gupta Sunita Verma R. Bhatla Amit Singh Chandel Janhavi Singh Swagata Payra |
spellingShingle |
Priyanshu Gupta Sunita Verma R. Bhatla Amit Singh Chandel Janhavi Singh Swagata Payra Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India Earth and Space Science MERRA‐2 validation RMSE PBIAS |
author_facet |
Priyanshu Gupta Sunita Verma R. Bhatla Amit Singh Chandel Janhavi Singh Swagata Payra |
author_sort |
Priyanshu Gupta |
title |
Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India |
title_short |
Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India |
title_full |
Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India |
title_fullStr |
Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India |
title_full_unstemmed |
Validation of Surface Temperature Derived From MERRA‐2 Reanalysis Against IMD Gridded Data Set Over India |
title_sort |
validation of surface temperature derived from merra‐2 reanalysis against imd gridded data set over india |
publisher |
American Geophysical Union (AGU) |
series |
Earth and Space Science |
issn |
2333-5084 |
publishDate |
2020-01-01 |
description |
Abstract The first detailed validation of maximum temperature of Modern‐Era Retrospective analysis for Research and Application Version 2 (TMERRA‐2) against Indian Meteorological Department (TIMD) has been carried out for 35 years (1981–2015) over India. For this purpose, India has been divided into seven different zones, i.e Western Himalaya (WH), Northwest, North Central, Northeast (NE), West Peninsula India, East Peninsula India, and South Peninsula India. The descriptive statistics and correlation between TMERRA‐2 and TIMD have been determined for monthly, seasonal, and annual basis. A significant correlation (>0.9) has been found for monthly TMERRA‐2 and TIMD with a root‐mean‐square error value closer to 1 except for WH where a high root‐mean‐square error value of 18.2 is obtained. Seasonal analysis also indicates a significant correlation for all the zones except for WH and NE with a correlation value of <0.3 during monsoon season; this may be due to sparse network, cold climate, and heterogeneity due to topography. Percent bias indicates that TMERRA‐2 generally overestimates the TIMD monthly observations for all the zones, that is, Northwest, North Central, NE, West Peninsula India, East Peninsula India, and South Peninsula India by 4.1%, 2.4%, 1.6%, 0.5%, 0.2%, and 0.8%, respectively, except WH where an underestimation (−82.5%) is determined. Thus, after calibration, MERRA‐2 Reanalysis maximum temperature may be used for further study of extreme weather events. |
topic |
MERRA‐2 validation RMSE PBIAS |
url |
https://doi.org/10.1029/2019EA000910 |
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