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Modulation of ISOs by land-atmosphere feedback and contribution to the interannual variability of Indian summer monsoon
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Modulation of ISOs by land-atmosphere feedback and contribution to the interannual variability of Indian summer monsoon
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Journal Article
Modulation of ISOs by land-atmosphere feedback and contribution to the interannual variability of Indian summer monsoon
2012
Overview
A mechanism of internal variability of Indian summer monsoon through the modulation of intraseasonal oscillation (ISO) by land‐atmosphere feedback is proposed. Evidence of feedback between surface soil moisture and ISOs is seen in the soil moisture data from GSWP‐2 and rainfall data from observations. Using two sets of internal simulation by a regional climate model (RCM), it is shown that internally generated anomalous soil moisture interacts with the following ISO and generates interannual variability. To gain further insight, 27 years of sensitivity experiment by prescribing wet (dry) soil moisture condition during break (active) period along with a control simulation are carried out. The sensitivity experiment reveals the large‐scale nature of soil moisture and ISO feedback which takes place through the changes in atmospheric stability by altering lower‐level atmospheric conditions. The feedback is inherent to the monsoon system and a part of it acts through the intraseasonal varying memory of soil moisture. The RCM used to test the hypothesis is constrained by one‐way interactions at the lateral boundary. Experiments with a much larger domain upheld the findings and hence suggest the true nature of soil moisture and ISO feedback present in the monsoon system. Key Points Indian summer monsoon and ISO interaction through soil moisture memory Mechanism of ISO variability through internal feedback Simulation of monsoon by regional climate model
Publisher
Blackwell Publishing Ltd,American Geophysical Union
