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Roles of land surface albedo and horizontal resolution on the Indian summer monsoon biases in a coupled ocean–atmosphere tropical-channel model ArchiMer
Samson, Guillaume; Masson, Sebastien; Durand, Fabien; Terray, Pascal; Berthet, Sarah; Jullien, Swen.
The Indian summer monsoon (ISM) simulated over the 1989–2009 period with a new 0.75° ocean–atmosphere coupled tropical-channel model extending from 45°S to 45°N is presented. The model biases are comparable to those commonly found in coupled global climate models (CGCMs): the Findlater jet is too weak, precipitations are underestimated over India while they are overestimated over the southwestern Indian Ocean, South-East Asia and the Maritime Continent. The ISM onset is delayed by several weeks, an error which is also very common in current CGCMs. We show that land surface temperature errors are a major source of the ISM low-level circulation and rainfall biases in our model: a cold bias over the Middle-East (ME) region weakens the Findlater jet while a...
Tipo: Text Palavras-chave: Indian summer monsoon; Land surface albedo; Horizontal resolution; Precipitation biases; Monsoon onset; CGCM.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00334/44481/44275.pdf
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