Diurnal Cycle of Convective Instability around the Central Mountains in Japan during the Warm Season.
Diurnal Cycle of Convective Instability around the Central Mountains in Japan during the Warm Season.
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DOI：
10.1175/jas3423.1
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发表时间：
2005-05
影响因子：
3.1
通讯作者：
Tomonori Sato;F. Kimura
中科院分区：
文献类型：
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作者：
Tomonori Sato;F. Kimura
摘要对流降雨往往表现出明显的日周期。夜间对流活动的高峰在世界山脉附近的各个地区普遍存在。利用数值模式和观测资料，研究了水汽和对流不稳定对夜间降水的影响。GPS气象学的最新发展允许以高时间分辨率估计可降水量。在日本建立了一个密集的网络。2000年8月的GPS分析结果表明：傍晚，由于低层水汽的辐合，在山区上空形成一个高GPS-PWV区，并在午夜前逐渐向邻近平原传播。一个对流区同时向东传播到平原。降水频率与GPS-PWV有较好的相关性，且在平原地区夜间达到最大值。该模式还提供了类似的特征，在降雨和降水的日周期。
Abstract Convective rainfall often shows a clear diurnal cycle. The nighttime peak of convective activity prevails in various regions near the world's mountains. The influence of the water vapor and convective instability upon nocturnal precipitation is investigated using a numerical model and observed data. Recent developments in GPS meteorology allow the estimation of precipitable water vapor (PWV) with a high temporal resolution. A dense network has been established in Japan. The GPS analysis in August 2000 provides the following results: In the early evening, a high-GPS-PWV region forms over mountainous areas because of the convergence of low-level moisture, which gradually propagates toward the adjacent plain before midnight. A region of convection propagates simultaneously eastward into the plain. The precipitating frequency correlates fairly well with the GPS-PWV and attains a maximum value at night over the plain. The model also provides similar characteristics in the diurnal cycles of rainfall an...