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An Alternative Index for the Onset of the Summer Monsoon over the South China Sea

机译：另一种指数的夏天季风在南中国海

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摘要

An alternative index for the onset of summer monsoon over the South China Sea (SCS) has been designed based on the reanalysis data of the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP/NCAR). It is found that the difference between the geopotential thickness over Guangzhou and Manila can be used as an alternative index for the onset of summer monsoon over the SCS. Since the convective heating alters the geopotential height and the distance between Guangzhou and Manila is of synoptic scale in the geostraphic framework, the index can represent the strength of heating and the first baroclinic cell over the SCS. By comparison between different indices, it is found that the summer monsoon onset over the SCS can be ascertained by the vertical zonal wind shear between 200 hPa and 850 hPa, the zonal wind at 850 hPa, the OLR anomaly, and the alternative index defined in the present paper. The meridional wind shear between 200 hPa and 850 hPa always appears over the SCS much earlier than the zonal wind shear and cannot be used as an index under consideration.
机译：另一个夏天爆发指数季风在南中国海(SCS)再分析数据的基础上设计的国家中心的环境Prediction-National中心大气研究(NCEP / NCAR)。位势厚度之间的区别在广州和马尼拉可以作为选择指数夏季季风的爆发SCS。位势高度和之间的距离广州和马尼拉的天气尺度geostraphic框架,索引可以表示加热和第一斜压的力量SCS细胞。不同的指标,发现夏季可以确定SCS季风爆发200 hPa和之间的垂直地带性风切变850 hPa,纬向风850 hPa OLR异常和中定义的替代指标本文。200 hPa和850 hPa在SCS总是出现比纬向风切变,不能更早被用作索引考虑。

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