caa a22 4500 445799587 CHVBK 20180317145136.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00704-010-0297-4 doi (NATIONALLICENCE)springer-10.1007/s00704-010-0297-4 Multiyear hindcast simulations of summer monsoon over South Asia using a nested regional climate model—BCC_RegCM1.0 [Elektronische Daten] [Sajjad Saeed, Yiming Liu, Ghulam Rasul] Multiyear (1983-2006) hindcast simulation of summer monsoon over South Asia has been carried out using the regional climate model of the Beijing Climate Centre (BCC_RegCM1.0). The regional climate model (hereafter BCC RCM) is nested into the global climate model of the Beijing Climate Centre BCC_CGCM1.0 (here after CGCM). The regional climate model is initialized on 01 May and integrated up to the end of the September for 24years. Compared to the driving CGCM the BCC RCM reproduces reasonably well the intensity and magnitude of the large-scale features associated with the South Asia summer monsoon such as the upper level anticyclone at 200hPa, the mid-tropospheric warming over the Tibetan plateau, the surface heat low and the 850hPa moisture transport from ocean to the land. Both models, i.e., BCC RCM and the driving CGCM overestimates (underestimates) the 850hPa southwesterly flow over the northern (southern) Arabian Sea. Moreover, both models overestimate the seasonal mean precipitation over much of the South Asia region compared to the observations. However, the precipitation biases are significantly reduced in the BCC RCM simulations. Furthermore, both models simulate reasonably the interannual variability of the summer monsoon over India. The precipitation index simulated by BCC RCM shows significant correlation (0.62) with the observed one. The BCC RCM simulates reasonably well the spatial and temporal variation of the precipitation and surface air temperature compared to the driving CGCM. Further, the temperature biases are significantly reduced (1-4°C) in the BCC RCM simulations. The simulated vertical structure of the atmosphere show biases above the four sub-regions, however, these biases are significantly reduced in the BCC RCM simulations compared to the driving CGCM. Compared to the driving CGCM, the evolution processes of the onset of summer monsoon, e.g., the meridional temperature gradient and the vertical wind shear are well simulated by the BCC RCM. The 24-year simulations also show that with a little exception the BCC RCM is capable to reproduce the monsoon active and break phases and the intraseasonal precipitation variation over the Indian subcontinent. Springer-Verlag, 2010 Saeed Sajjad Pakistan Meteorological Department, Islamabad, Pakistan aut Liu Yiming Beijing Climate Centre, China Meteorological Administration, Beijing, China aut Rasul Ghulam Pakistan Meteorological Department, Islamabad, Pakistan aut Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 249-264 0177-798X 103:1-2<249 2011 103 704 https://doi.org/10.1007/s00704-010-0297-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-010-0297-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Saeed Sajjad Pakistan Meteorological Department, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Liu Yiming Beijing Climate Centre, China Meteorological Administration, Beijing, China aut NATIONALLICENCE 700 1- Rasul Ghulam Pakistan Meteorological Department, Islamabad, Pakistan aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 103/1-2(2011-01-01), 249-264 0177-798X 103:1-2<249 2011 103 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer