Data from coupled RSM simulations

Abstract

The Regional Spectral Model (RSM; atmospheric component) coupled with Regional Ocean Modeling System (ROMS; oceanic component) is used in this study as the Regional Coupled Model(RCM) (H. Li & Misra, 2014; Misra, Mishra, & Bhardwaj, 2017; Misra et al., 2018). The RCM performs reasonably well in capturing the mean seasonal rainfall over the Indian region as well as the subseasonal variability (Misra et al., 2017, 2018). The circulation patterns associated with the active-break cycle over India are well-simulated in the model. The RSM was first introduced in Juang and Kanamitsu (1994) and several modifications have been made to the model since then (Glazer & Misra, 2018; Kanamitsu, Yoshimura, Yhang, & Hong, 2010; Misra et al., 2018). It has 28 terrain following sigma vertical coordinates. The ROMS has 30 vertical sigma levels on a horizontal staggered Arakawa C grid (Shchepetkin & McWilliams, 2005). In this experiment, a 10 km grid resolution is used and the grids are identical for both the RSM and ROMS. This enables direct exchange of fluxes between atmospheric and oceanic components without the need for interpolation. The coupling between ROMS and RSM occurs at three hour interval. Flux correction is not applied to the integration. The domain of integration is specified over the Indian region as shown in Misra et al. (2018) (roughly 4N-37N, 50E-101E). Lateral boundary conditions for the RSM are prescribed by the National Centers for Environmental Prediction{Department of Energy global atmospheric reanalysis (Kanamitsu et al., 2002) every six hours. The ROMS boundary forcings are from Simple Ocean Data Assimilation version 2.2.4 (SODA v2.2.4), global oceanic analysis (Carton & Giese, 2008) prescribed at a monthly interval. The integration is carried out for a period of 10 years from January 1, 1986 through December 31, 1995