Diurnal Variation of Precipitation and Moisture Transport by Local Circulations

当地环流降水和水汽输送的日变化

• 批准号: 08454128
• 负责人: KIMURA Fujio
• 金额: $ 3.33万
• 依托单位: UNIVERSITY OF TSUKUBA
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454128/
• 关键词: PRECIPITATION; DIURNAL VARIATION; LOCAL CIRCULATION; MOISTURE TRANSPORT; MOUNTAIN

This study reveals the relation of probability of precipitation and moisture transport by the local circulations, which are generated by the contrast of land /sea or mountain/valley. Field experiments, data analysis and numerical experiments are carried out. Precipitable water vapor obtained by GPS (Gloval Positioning System) are also used for the analysis.As the results, it was shown that the precipitation in the Kanto area on the calm clear days in summer has the following characteristics :1.Probability density of precipitation has clear diurnal variation with the maximum in late afternoon or early evening.2.Horizontal distribution of probability density of precipitation correlate well with orograpy.3.The orographic effects is lareger than the effect of the contrast of land and sea.4. Probability density of precipitation becomes large in the mountainous region in the afternoon, and then high probability density area extends toward the plain.These results show that the moisture transport by local circulations has strong relationship with convective precipitation developed over mountainous region in summer. For the prediction of these convective precipitation, i.e., thunder storms, observing precipitable water vapor is very important.

这项研究揭示了当地循环的降水和水分传输概率的关系，这些循环是由陆地 /海洋或山地 /山谷的对比产生的。进行现场实验，数据分析和数值实验。通过GPS（吊车定位系统）获得的沉淀水蒸气也用于分析。结果表明，在夏季平静的晴朗日期，Kanto区域的降水量具有以下特征：1。降水的繁殖密度明显，在下午或傍晚时期具有最大的危险性，而降水的效应均高于或降低的效果，或者均具有相关性的效果。土地和海的对比4。下午，山区降水的概率密度变得很大，然后较高的概率密度区域延伸到平原。这些结果表明，局部循环的水分传输与夏季在山区在山区发展的对流降水之间有着密切的关系。为了预测这些对流降水量，即雷暴，观察可降水的水蒸气非常重要。

项目成果

Kang,S.D.and F.Kimura: "Study of topographically induces disturbance with strong static instability on the formation on cloud streets in the lee of an isolated mountain near coast" Proceedings of 12th symposium of boundary layers and turbulence. July 28 -

Kang,S.D.和F.Kimura：“地形诱发强静态不稳定扰动的研究，对近海岸孤山背风云街的形成”，第12届边界层与湍流研讨会论文集。

Kang and Kimura: "Study of topographically induces disturbance with strong static instability on the formation on cloud streets in the lee of an isolated mountain near coast." Proc.of boundary layers and turbulence Vancouver,BC.Canada.(1997)

Kang和Kimura：“地形研究对靠近海岸的一座孤山背风处的云街地层的形成产生了强烈的静态不稳定性扰动。”

Kuwagata.T.and F.Kimura: "Daytime boundary layer evolutions in a deep valley, Part 11 : Numerical simulation of the cross-valley circulation." J.Appl.Meteor.36. 883-895 (1997)

Kuwagata.T. 和 F.Kimura：“深谷中的白天边界层演化，第 11 部分：跨谷环流的数值模拟。”

Kimura, F.: "Change in local wind system over Kanto Plain by Land Reclamation in Tokyo Bay." Proceedings of 13th International Clean Air and Envirnment Conference. 22-25 Septenber Adelaide, Australia.485-488 (1996)

Kimura, F.：“东京湾填海造地改变了关东平原的局部风力系统。”

Kang and Kimura: "A Numerical study on the mechanism of cloud-street formation in the lee of an isolated mountain near coast." J.Meteoro.Soc.Japan.75. 955-968 (1997)

Kang和Kimura：“关于海岸附近孤山背风处云街形成机制的数值研究”。