Title

新疆降水與環流場演變研究

Translated Titles

Study on the Change of Precipitation and General Circulation in Xinjiang

Authors

王嬌(Jiao Wang);任宜勇(Yi-Yong Ren)

Key Words

新疆 ; 降水量 ; 環流場 ; 氣候背景 ; Xinjiang ; precipitation ; change of general circulation ; composition analysis

PublicationName

乾旱區研究

Volume or Term/Year and Month of Publication

22卷3期(2005 / 09 / 01)

Page #

326 - 331

Content Language

簡體中文

Chinese Abstract

通過分析南、北疆地區近50a來的降水演變特徵,將南、北疆地區降水多寡典型年份對應的500hPa高度場和海平面氣壓場的距平進行合成,討論了多雨和少雨期大氣環流的氣候背景特徵。結果表明,近20多年南、北疆降水較20世紀60-70年代均有顯著增加。南、北疆夏季降水與大氣環流之間亦存在一定的聯繫,尤其是烏拉爾山高壓脊的增強明顯有利於南、北疆降水。

English Abstract

Located in the hinterland of Eurasia, Xinjiang is far away from oceans, it is surrounded by high mountains and is a well-known arid and semiarid region, and its precipitation is significantly less than that in other provinces and autonomous regions. According to the observation data, however, the climate change in Xinjiang has shifted from warming-drying type towards warming-wetting type since the late-1980s, which is reflected by the significant increase of precipitation, shrinkage of modem glaciers, increase of runoff volumes of the rivers, enlargement of water areas of the lakes, rise of groundwater level, and improvement of natural vegetation status. In this paper, the change of precipitation in south Xinjiang and north Xinjiang is analyzed, the anomalies of 500hPa and sea-level air-pressure fields about precipitation are composed, and the climatic background characteristics of general circulation are discussed. The results are as follows: (1) Precipitation in both south Xinjiang and north Xinjiang was slowly increased during the period of 1951-2000, and the increase trend has been more significantly since recent 20 years; (2) The monthly precipitation in south Xinjiang in February, May, November and December during the period of 1978-1998 was reduced than that during the period of 1956-1976, and the monthly precipitation in other months was increased, especially in June; the monthly precipitation in north Xinjiang in February, March April and August during the period of 1978-1998 was reduced than that during the period of 1956-1976, and the monthly precipitation in other months was increased, especially in October; (3) The enhancement of the Ural wedge is advantageous for the increase of precipitation in both south Xinjiang and north Xinjiang; (4) The increase of the sea-level air pressure in the regions near the Ural Mountains is advantageous for the increase of precipitation in both south Xinjiang and north Xinjiang.

Topic Category 基礎與應用科學 > 地球科學與地質學
生物農學 > 生物科學
生物農學 > 農業
生物農學 > 生物環境與多樣性