摘要
利用全国515站（1957~2000年）气象资料,修正计算帕默尔干旱指数,研究中国夏季区域干旱演变特征及其与东亚夏季风的关系。结果表明：除内蒙古高原区、华北北部及长白山脉区、黄土高原区、云贵高原区、东北平原区等5区域夏季干旱指数呈下降趋势外,南岭区、长江中下游区、黄淮区域、塔里木盆地区、天山北部区域、河西走廊及其沙漠戈壁区、青藏高原区等广大区域夏季干旱指数均呈上升趋势。中国夏季干旱指数大多存在5~8a的短周期年际周期变化,12~13 a、15~16 a的长周期年际周期变化存在于部分区域,个别区域还存在20~25 a长周期年际周期变化。西北和青藏高原夏季干旱指数与东亚夏季风指数呈负相关,中东部地区夏季干旱指数与东亚夏季风指数呈正相关。
By modifying Palmer drought severity index based on meteorological data of 515 stations from 1957 to 2000 over China, characteristics of regional drought evolution were analyzed in spring. The results show that the summer drought index takes on descendant trend in the Inner Mongolian plateau area, the north part of North China and Changbaishan Mountain area, the Loess Plateau area, the Yunnan - Guizhou Plateau area and the plain of Northeast China,but it takes on ascendant trend in the Nanling Mountain areas, the Yangtze River area, the Yellow River and Huaihe River area, the Hexi Corridor area, the north of Tianshan Mountain area, the Talimu Basin area and the Qinghai- Tibet Plateau area. It is proved that the drought index exists 5-8 a period in the most areas, it exists 12--13 a and 15--16 a period in some areas, it also exists 20--25 a period in specific area. The east Asia summer monsoon is contrary bound up with the summer drought severity index of Northwest China and Qinghai - Tibet Plateau,but it is identical bound up with with the summer drought severity index of the Middle and East China.
出处
《干旱地区农业研究》
CSCD
北大核心
2009年第1期248-253,264,共7页
Agricultural Research in the Arid Areas
基金
科技部科研院所社会公益研究专项项目(2004DIB5J192)
干旱气象科学研究基金项目(IAM200711)
关键词
帕默尔干旱指数
夏季干旱
区域特征
中国
palmer drought severity index
summer drought
regional characteristic
China
