Impact of moisture variations on the circulation of the south-west monsoon |
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Authors: | C M Kishtawal P K Pal M S Narayanan S K Manna O P Sharma Sangeeta Agarwal H C Upadhyaya |
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Affiliation: | 1. Meteorology and Oceanography Division, Space Applications Centre, 380 053, Ahmedabad, India 2. Department of Physics, University of Poona, 411 007, Pune 3. Centre for Atmospheric Sciences, Indian Institute of Technology, 110 016, Delhi
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Abstract: | The impact of moisture anomalies on the circulation of the south-west Indian monsoon has been studied with a general circulation model. Newtonian relaxation is adopted to subject the model atmosphere under sustained moisture anomalies. The impact of negative anomalies of moisture was seen as a divergent circulation anomaly, while the positive anomaly was a stronger convergent anomaly. Although the humidity fields display a resilient behaviour, and relax back to normal patterns 1–2 days after the forcing terms in humidity are withdrawn, the circulation anomalies created by the moisture variation keeps growing. A feedback between positive moisture anomalies and low level convergence exists, which is terminated in the absence of external forcings. |
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