Assessment of CORDEX-SA experiments in representing precipitation climatology of summer monsoon over India

Abstract

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On bias correction of summer monsoon precipitation over India from CORDEX‐SA simulations

“…A consistent dry bias in CCAM over India is also reported in previous study by Choudhary et al . (). After bias correction, the dry bias though still remains (also seen in Figure S2b) but there is an improvement in results from all the methods as considerable number of points now appear to be located around line of equality compared to that in uncorrected model result.…”

“…These two RCMs are selected as they perform distinctly with respect to each other for Indian summer monsoon as seen by Choudhary et al . () in an earlier work. After applying bias correction, improvements are found in results from both the models with all bias correction approaches, but there are clear differences in the degrees of success depending upon the measure of precipitation studied.…”

“…One of such regional domains is South Asia (SA) which includes India and is the focus of present study. The CORDEX‐SA simulations without applying any bias correction are assessed in the past for seasonal mean precipitation and temperature changes over India and adjoining Himalayan region (Choudhary et al ., ; Ghimire et al ., ; Nengker et al ., ; Varikoden et al ., ; Choudhary and Dimri, ; ; Dimri et al ., ; ). However, the present study attempts to compare the skill of different bias correction methods in improving the results from CORDEX‐SA simulations in representing summer monsoon precipitation over India.…”

Changes in rainfall seasonality pattern over India

“…The recent period was selected based on extensive previous studies in which various authors (e.g. Naidu et al ., ; Choudhary et al ., ) have used the period from 1970 onwards as the present climate to observe changes over the Indian region. Naidu et al .…”

Role of Arabian Sea warming on the Indian summer monsoon rainfall in a regional climate model

“…The regional climate models (RCMs) have been found to realistically simulate the ISMR due to improved regional model physics, better representation of regional topography and land surface processes and better interaction mechanism among different regional model components (i.e., atmosphere, ocean and land) (Gao et al, 2012;Bukovsky et al, 2013;Feng and Fu, 2013;Pattnayak et al, 2013;Raju et al, 2015;Maurya et al, 2017;Ngo Duc et al, 2017;Bhatla et al, 2018;Choudhary et al, 2018;Devanand et al, 2018;Ghimire et al, 2018;Ghosh et al, 2018;Hassan and Du, 2018;Mishra and Dwivedi, 2019;Nayak et al, 2018). It has been argued that the rainfall distribution simulated by the downscaled high-resolution RCMs also capture at local scales (and physical processes) which are not resolved by the general circulation models (GCMs) (Giorgi et al, 1994;Dobler and Ahrens, 2011;Lucas-Picher et al, 2011;Mishra and Dwivedi, 2019).…”