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Prediction of Indian summer-monsoon onset variability: A season in advance
Pradhan, M.; Rao, A.S.; Srivastava, A.; Dakate, A.; Salunke, K.; Shameera, K.S. (2017). Prediction of Indian summer-monsoon onset variability: A season in advance. NPG Scientific Reports 7(1): 14 pp. https://dx.doi.org/10.1038/s41598-017-12594-y
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
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| Auteurs | | Top |
- Pradhan, M.
- Rao, A.S.
- Srivastava, A.
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- Dakate, A.
- Salunke, K.
- Shameera, K.S.
|
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| Abstract |
Monsoon onset is an inherent transient phenomenon of Indian Summer Monsoon and it was never envisaged that this transience can be predicted at long lead times. Though onset is precipitous, its variability exhibits strong teleconnections with large scale forcing such as ENSO and IOD and hence may be predictable. Despite of the tremendous skill achieved by the state-of-the-art models in predicting such large scale processes, the prediction of monsoon onset variability by the models is still limited to just 2–3 weeks in advance. Using an objective definition of onset in a global coupled ocean-atmosphere model, it is shown that the skillful prediction of onset variability is feasible under seasonal prediction framework. The better representations/simulations of not only the large scale processes but also the synoptic and intraseasonal features during the evolution of monsoon onset are the comprehensions behind skillful simulation of monsoon onset variability. The changes observed in convection, tropospheric circulation and moisture availability prior to and after the onset are evidenced in model simulations, which resulted in high hit rate of early/delay in monsoon onset in the high resolution model. |
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