Characteristics of Diurnal Variations in Convection and Precipitation over the Southern Tibetan Plateau during Summer
Characteristics of Diurnal Variations in Convection and Precipitation over the Southern Tibetan Plateau during Summer
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DOI：
10.2151/sola.2005-014
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发表时间：
2005-01-01
期刊：
影响因子：
1.9
通讯作者：
Yasunari, Tetsuzo
中科院分区：
文献类型：
--
作者：
Fujinami, Hatsuki;Nomura, Shigeyuki;Yasunari, Tetsuzo
研究了青藏高原南部复杂山谷地形夏季风成熟期对流和降水的日变化特征。在沿着北纬28.5度和北纬30.2度的山脉上，高云的云覆盖频率（CCF）在13 LST（07 UTC）之后增加，在18 LST（12 UTC）附近达到最大值。高CCF地区随后沿沿着29.3度向山谷地区移动;相对较高的CCF持续到清晨。热带降雨测量使命任务（TRMM）PR数据显示降雨频率的变化几乎相同。对流型云的形成和发展以及日周期中的相位差受地形的强烈影响。文中还讨论了青藏高原南部对流增强的可能机制。
This study investigated diurnal cycles in convection and precipitation over the complex mountain-valley terrain of the southern Tibetan Plateau (TP) during the mature phase of the summer monsoon. Cloud-cover frequency (CCF) for high cloud increased after 13 LST (07 UTC) over the mountain ranges along 28.5 degrees N and 30.2 degrees N, reaching a maximum near 18 LST (12 UTC). Areas of high CCF subsequently moved towards the valley area along 29.3 degrees N; relatively high CCF persisted there until early morning. Tropical Rainfall Measuring Mission (TRMM) PR data show a nearly identical variation in rainfall frequency. Formation and development of convective-type clouds and phase differences in the diurnal cycle were strongly affected by TP topography. Possible mechanisms for convective enhancement over the southern TP are also discussed.