The application of integrated regional enstrophy in identifying the south Asian summer monsoon season
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This study uses integrated regional enstrophy (IRE) to identify the onset and termination of South Asian summer monsoon (SASM) (10[degrees] N-25[degrees] N, 80[degrees] E-120[degrees] E) from 2000 to 2019. The SASM region is separated into two parts. The one in the Bay of Bengal (BOB) (10[degrees] N-25[degrees] N, 80[degrees] E-100[degrees] E) represents the Indian summer monsoon and the other one in the Western North Pacific (WNP) (10[degrees] N-25[degrees] N, 100[degrees] E-120[degrees] E) represents the Western North Pacific summer monsoon region. The onset is defined by the first day that the low-pass (6-month) IRE is larger than the 20-year average, and the retreat date is defined as the first day the low-pass IRE is less than the average. The same method is applied to the precipitation rate (Prate), and the opposite method is applied to the outgoing longwave radiation (OLR). The results from each definition and each region are compared. In general, the IRE gave later onset than Prate and OLR, which resulted in a shorter SASM season. The later onsets given by IRE may be related to the bogus monsoon onset caused by the intraseasonal oscillation. The interannual variation caused by ENSO were not obvious with SASM defined by IRE. The WNP and the whole SASM regions seem to be more obviously affected by to the phase transition process of ENSO.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License. Copyright held by author.