Relationship between intraseasonal oscillation and diurnal variation of summer rainfall over the South China Sea
Relationship between intraseasonal oscillation and diurnal variation of summer rainfall over the South China Sea
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DOI：
10.1029/2007gl031962
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发表时间：
2008-02-01
影响因子：
5.2
通讯作者：
Takayabu, Yukari N.
中科院分区：
文献类型：
--
作者：
Ho, Chang-Hoi;Park, Myung-Sook;Takayabu, Yukari N.
本文分析了南海（110°E-120°E, 10°N-20°N）夏季降水的日变化特征，分析了以850 hpa纬向风为特征的季内涛动（ISO）活跃期和不活跃期。通过对1999-2006年热带降雨测量任务降水雷达资料的分析，发现ISO活跃期和非活跃期降水峰值分别出现在上午晚些时候和傍晚。ISO活跃期的早高峰是由菲律宾西海岸局地辐合引起的有组织的海洋对流系统引起的。非活动ISO期的晚高峰源于菲律宾上空白天增加的热力不稳定性导致的陆基对流系统引发的层状形态。
The diurnal variations in summer rainfall over the South China Sea (110 degrees E-120 degrees E, 10 degrees N-20 degrees N) are examined for active and inactive intraseasonal oscillation (ISO) periods that are characterized by strong and weak 850-hPa zonal winds, respectively. By analyzing the rainfall retrievals from the Tropical Rainfall Measuring Mission Precipitation Radar for the period 1999-2006, it is found that the peak rainfall during the active and inactive ISO periods occurs in the late morning and late evening, respectively. The morning peak in the active ISO period arises from the organized oceanic convective systems associated with the local convergence along the west coast of the Philippines. The evening peak in the inactive ISO period originates from a stratiform morphology that is initiated by land-based convective systems owing to the increased thermodynamic instability over the Philippines during daytime.