Definition of the South China Sea summer monsoon onset |
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Authors: | Tian Ying Wang Qi |
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Institution: | (1) Department of Atmospheric Sciences, National Central University, Jhongli, Taoyuan, 32001, Taiwan |
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Abstract: | We analyze statistically different definitions of the South China Sea summer monsoon (SCSSM) onset are to establish a SCSSM
onset time series that is more recognizable by a majority of indicators. With the acknowledged index, we determine a key area
(105°E–112.5°E, 7.5°N–12.5°N) and define the zonal wind component in this key area as a new SCSSM onset index, using daily
mean reanalysis data of the National Center for Environmental Prediction/National Center for Atmospheric Research. The atmospheric
circulations before and after the onset of the SCSSM determined using the index defined in this paper are preliminarily studied.
Results show that the Somalia cross-equatorial flow is enhanced, the strongest westerly wind in the tropical Indian Ocean
shifts northward, the cyclone couple in the Bay of Bengal and the Southern Hemisphere weaken and move eastward, convection
over the South China Sea increases, and the subtropical high retreats from the South China Sea after the outbreak of the SCSSM.
By analyzing the atmospheric circulation, it is found that in 1984 and 1999, the SCSSM broke out in pentads 29 and 23, respectively,
which is consistent with the onset times determined using our index. |
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