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Study on the role of land-atmosphere coupling on the south Asian monsoon climate variability using a regional climate model

Unnikrishnan, CK and Rajeevan, M and Rao, SVB (2017) Study on the role of land-atmosphere coupling on the south Asian monsoon climate variability using a regional climate model. Theoretical and Applied Climatology, 127 (3). pp. 949-964.

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Abstract

Land-atmosphere coupling over the south Asian monsoon region is examined using a regional climate model. For this purpose, the Weather Research and Forecasting (WRF) model with a resolution of 45 km was used. In the control experiment (CTL), the model was integrated from the year 2000 to 2011 and allowed the soil moisture interaction with the atmosphere using a coupled land surface model. In the second experiment (CSM), the soil moisture evolution at each time step was replaced with the climatology of soil moisture taken from the control run. The results reveal that land-atmosphere coupling plays a critical role in influencing the south Asian monsoon climate variability. Soil moisture is found to have stronger impacts on daily maximum temperature compared to minimum temperature. Soil moisture also makes a significant contribution to monsoon rainfall variability over the monsoon region. The coupling strength for large-scale rainfall is found to be higher compared to that of cumulus rainfall. Soil moisture is found more strongly coupled to sensible heat flux over most of the monsoon region.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer International Publishing
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 15 Dec 2017 10:56
Last Modified: 15 Dec 2017 10:56
URI: http://moeseprints.incois.gov.in/id/eprint/4226

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