REGIONAL AND TEMPORAL VARIATIONS IN PRECIPITATION IN THE EASTERN PART OF THE HIMALAYAS

喜马拉雅山脉东部降水的区域和时间变化

• 批准号: 07680187
• 负责人: EGUCHI Takashi
• 金额: $ 1.28万
• 依托单位: KOCHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680187/
• 关键词: Bhutan Himalaya; Monsoon; Intraseasonal variation; Mountain and valley circulation; Precipitation intensity; Heavy rain; Cyclone; 降水量; 気流系; 降水の年変化; 降水量強度; モンスーン循環; 山谷風循環

The purpose of this study is to clarify the regional characteristics of intraseasonal variation in precipitation in the eastern part of the Himalayas and its relationship with the Indian summer monsoon. The daily precipitation is analyzed mainly in the Bhutan Himalaya and the results are as follows ;1.The difference in precipitation between the southern foothills and the intramontane basin in the Bhutan Himalaya depends mainly on the intensity of daily precipitation, and the difference in the intensity of precipitation is considered to be related to two air circulation systems with a different spatial scale. One is the monsoon circulation system on a synoptic scale and the other is the mountain and valley circulation system on a local scale.2.The precipitation in the Bhutan and Nepal Himalayas is considered to increase (decrease) during the break (active) phase of the Indian summer monsoon in June and July. However, from mid August, the relationship between precipitation in the Bhutan and Nepal Himalayas and the activity of summer monsoon is not clear.3.The cause of heavy rains in 1989 is the cyclones passing near the Bhutan Himalaya around 18th May and 15th June. The cyclone brings relatively widespread heavy rains in the Bhutan Himalaya and, in the intramontane basin, they have much precipitation.Based on above results, it is shown that the relationship between the activity of Indian summer monsoon and the precipitation in the Himalayas changes from July to August. Moreover, it should be careful of the damages caused by the cyclone, especially in the intramontane basin of the Bhutan Himalaya.

本文旨在阐明喜马拉雅东部降水季节内变化的区域特征及其与印度夏季风的关系。主要对不丹喜马拉雅地区的日降水量进行了分析，结果如下：1.不丹喜马拉雅山脉南麓与山内盆地的降水差异主要取决于日降水强度，认为降水强度的差异与两个不同空间尺度的大气环流系统有关。一个是天气尺度上的季风环流系统，另一个是局地尺度上的山地和山谷环流系统。2.不丹和尼泊尔喜马拉雅地区的降水在6、7月份印度夏季风的间歇(活跃)阶段被认为是增加(减少)的。然而，从8月中旬开始，不丹和尼泊尔喜马拉雅地区的降水与夏季风活动的关系尚不清楚。3.1989年暴雨的原因是5月18日至6月15日前后在不丹喜马拉雅附近经过的气旋。结果表明，印度夏季风活动与喜马拉雅地区降水的关系在7-8月发生变化。此外，它还应注意气旋造成的破坏，特别是在不丹喜马拉雅山脉内盆地。

项目成果

Eguchi, T.: "Regional characteristics of the summer monsoon onset in the Indochina Peninsula" Research Reports of Kochi University, 45 (Humanities). (In Printing).

Eguchi, T.：“中南半岛夏季风爆发的区域特征”高知大学研究报告，45（人文）。

Eguchi,T.: "Regional Classification of the western Part of the Indochina Peninsula based on annual variation in precipitation" Research Reports of Department of Humanities,Faculty of Humanities and Economics.Kochi University. 4. 1-9 (1996)

Eguchi,T.：“基于降水量年变化的中南半岛西部地区分类”高知大学人文经济学院人文系研究报告。

Eguchi,T.: "Regional Characteristics of the summer monsoon onset in the Indochina Peninsula." Reserch Report of Kochi University. 45(印刷中).

Eguchi, T.：“印度支那半岛夏季季风爆发的区域特征”，高知大学研究报告 45（出版中）。

Kawamura,K,Yanase,A.,Eguchi,T.,Mikami,T.,and Barrie,A.: "Enhanced at mospherio transport of soil derived organic matler in spring over the high Arctic." Geophysical Research Letter. 23. 3735-3738 (1996)

Kawamura,K、Yanase,A.、Eguchi,T.、Mikami,T. 和 Barrie,A.：“增强北极高地春季土壤衍生有机物质的 mospherio 运输。”

Eguchi,T.: "Regional Characteristics of the summer monsoon ons et in the Indochina Peninsula" Research Reports of Kochi University. 45(印刷中).

Eguchi, T.：“中南半岛夏季风的区域特征”高知大学研究报告45（出版中）。