The role of radiative transfer in maintaining the Indian summer monsoon circulation

Leach, M. J. ; Raman, S. ; Mohanty, U. C. ; Madala, R. V. (1997) The role of radiative transfer in maintaining the Indian summer monsoon circulation Pure and Applied Geophysics, 149 (3). pp. 601-622. ISSN 0033-4553

PDF - Publisher Version

Official URL:

Related URL:


The radiative-convective feedback and land-sea thermal forcing play significant roles in maintenance of the summer monsoon circulation over the Indian sub-continent. In this study, the role of radiative transfer in maintaining the monsoon circulation is examined with numerical sensitivity experiments. For this purpose, a sixteen layer primitive equation limited area model is used to perform numerical simulations with and without atmospheric radiative transfer processes parameterized in the model. The initial values and boundary conditions for the numerical integrations of the model are derived from operational analyses of the ECMWF, UK. The results show that the radiative transfer is essential in maintaining the intensity of the low level Somali Jet as well as the upper level Tropical Easterly Jet (TEJ) over the Indian sub-continent and adjoining seas. The meridional circulation over the region is also well simulated. As a result, enough moisture transports from the warm equatorial region to simulate more realistic orographic precipitation in the windward side of the mountains along the West coast of India. Without radiative transfer processes in the model atmosphere the simulated monsoon circulation weakens, moisture transport decreases and the precipitation lessens.

Item Type:Article
Source:Copyright of this article belongs to Birkhauser-Verlag.
Keywords:Atmospheric Radiative Transfer; Circulation; Indian Summer Monsoon; Thermal Forcing
ID Code:26671
Deposited On:08 Dec 2010 13:24
Last Modified:17 May 2016 09:58

Repository Staff Only: item control page