Accession Number : ADA294156

Title :   Intra-Annual and Inter-Annual Rainfall Variability over East Asia, Southeast Asia, and South Asia,

Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

Personal Author(s) : Yang, Guangji ; Liu, Jiaming

PDF Url : ADA294156

Report Date : 25 APR 1995

Pagination or Media Count : 23

Abstract : This article applied average monthly precipitation data for April-September 1951-1981 and average ten-day data for April-September 1961-1970. It did research on inter-annual and intra-annual changes in precipitation for East Asia, South Asia, and Southeast Asia. It analyzed precipitation differences between eastern and western China as well as the characteristics of Yangtze valley drought and excessive rain. Results point out that there is a constant trend shown in a southwest-northeast direction in association with distributions of areas of large rainfall above 200mm from April to September in East Asia, South Asia, and Southeast Asia. It is closely in line with the direction of movement associated with southwest monsoons. In this belt of heavy rains, three different types of precipitation are included. Besides this, amounts of 10 day precipitation in China's Yangtze-Huai area from July to September harbor quasi periodic oscillation phenomena associated with periods of approximately 20 days. They are completely different from precipitation distributions associated with western China. Precipitation in south and central China has an inverse relationship to El Nino phenomena. Statistical results clearly show that there is only a 23% probability of producing sustained heavy rain and sustained scarce rain on the middle and lower reaches of the Yangtze River in summer. Most years have normal precipitation. Finally, we also discussed circulation factors influencing drought and excessive rain on the middle and lower reaches of the Yangtze River in summer. (AN)

Descriptors :   *SEASONAL VARIATIONS, *RAINFALL INTENSITY, SPATIAL DISTRIBUTION, COMPARISON, AIR FLOW, WIND, ATMOSPHERIC MOTION, METEOROLOGICAL DATA, RAIN, CLIMATE, TRANSLATIONS, RIVERS, FLOODS, BAROMETRIC PRESSURE, MOISTURE, AIR WATER INTERACTIONS, AREA COVERAGE, VALLEYS, SOUTHEAST ASIA, SUMMER, CHINA, DROUGHT, CHINESE LANGUAGE, MONSOONS, FAR EAST, SOUTH ASIA.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE