Diurnal land-sea rainfall peak migration over Sumatera Island, Indonesian maritime continent, observed by TRMM satellite and intensive rawinsonde soundings
Diurnal land-sea rainfall peak migration over Sumatera Island, Indonesian maritime continent, observed by TRMM satellite and intensive rawinsonde soundings
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DOI：
10.1175/1520-0493(2004)132
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发表时间：
2004-08-01
影响因子：
3.2
通讯作者：
Sribimawati, T
中科院分区：
文献类型：
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作者：
Mori, S;Hamada, JI;Sribimawati, T
利用热带降雨测量使命（TRMM）卫星降水雷达（PR）和密集型探空仪资料，研究了印度尼西亚海洋大陆苏门答腊岛降水的日变化及其区域变化。TRMM PR传感器可以直接探测雨滴，而不受地面和云层条件的影响，并可以区分对流和层状降雨类型。结果表明，该地区降水的变化具有以下特点：1）苏门答腊岛陆地地区主要为对流降水，其峰值在1500 ~ 2000 LT之间，而周围海域主要为清晨降水，其降水类型基本上由层状降水和对流降水组成。2)白天的降雨高峰和夜间的降雨高峰随着时间的推移从该岛的西南海岸线分别迁移到内陆和近海地区。每个降雨峰值迁移距离海岸线最远可达400 km，平均迁移速度约为10 m s（-1）。3)利用TRMM PR、强探空、静止气象卫星（GMS）资料、高分辨率雷达资料和高分辨率雷达资料，分析了陆-海降水峰值迁移的机制，并对降水峰值迁移的原因进行了探讨。客观再分析和地面观测数据。最后，一个关键的差异，在白天和夜间的近海地区的内陆地区的降雨峰值迁移机制建议。
The diurnal cycle of rainfall and its regional variation over Sumatera Island, Indonesian Maritime Continent, are examined using Tropical Rainfall Measuring Mission (TRMM) satellite precipitation radar (PR) and intensive rawinsonde sounding data. The TRMM PR sensor can detect raindrops directly, regardless of ground and cloud conditions, and can distinguish between convective and stratiform types of rainfall. Rainfall variation over this area was found to have the following characteristics: 1) convective rainfall with a broad peak between 1500 and 2000 LT predominates over the land region of Sumatera Island, whereas rainfall in the early morning, composed almost equally of stratiform and convective types, is predominant over the surrounding sea region. 2) A rainfall peak in the daytime and one in the nighttime migrate with time starting from the southwestern coastline of the island into the inland and offshore regions, respectively. The distance of each rainfall peak migration from the coastline is up to 400 km, and the average speed of migration is approximately 10 m s(-1). 3) Using intensive rawinsonde sounding data, it was also found that remarkable diurnal variations of wind, humidity, and stability appear in the lower troposphere corresponding to the migrating rainfall peaks over both the inland and the coastal sea regions.The mechanism of the diurnal land-sea rainfall peak migration is discussed comprehensively using TRMM PR, intensive rawinsonde soundings, Geostationary Meteorological Satellite (GMS) data, objective reanalysis, and ground-based observation data. Finally, a crucial difference in rainfall peak migrating mechanisms is suggested between those toward the inland region in the daytime and the offshore region in the nighttime.