Observed Decadal Transition in Trend of Autumn Rainfall over Central China in the Late 1990s
Observed Decadal Transition in Trend of Autumn Rainfall over Central China in the Late 1990s
复制标题
20世纪90年代末华中地区秋季降水趋势的年代际变迁观测
DOI：
10.1175/jcli-d-18-0112.1
复制
发表时间：
2019-01
影响因子：
4.9
通讯作者：
Zhou Botao
中科院分区：
文献类型：
--
作者：
Wang Zunya;Zhou Botao
本文研究了20世纪90年代后期中国中部秋季降水由减少趋势向增加趋势的年代际转换。这一制度转变的大气和海洋背景也得到了解决。伴随着上述年代际转变，中国中部地区平均水汽辐合和上升运动均由减弱趋势转向加强趋势。同时，90年代后期以后，亚洲海平面气压的下降和拉科鲁尼亚湖槽的加深，可能促使更多的高纬冷空气南下爆发。东亚低层南风的加强可以将更多的水汽从低纬度地区输送到北方。冷空气和暖湿气流在目标区域相遇增多，导致局地降水有增加的趋势。20世纪90年代后期以前的情况普遍逆转，这是秋季降雨量减少趋势的原因。东亚急流自南向北的移动也通过其对动力条件的影响而作出贡献。此外，20世纪90年代后期西印度洋和大西洋海表温度（SST）从变冷趋势到变暖趋势的变化通过对水汽输送和冷空气活动的调制发挥了重要作用。
This article presents a decadal transition from a decreasing trend to an increasing trend in the late 1990s for autumn rainfall in central China. The atmospheric and oceanic background underlying this regime shift is also addressed. Accompanying the above decadal transition, the moisture convergence and ascending motion averaged in central China both switch from a weakening trend to a strengthening trend. Meanwhile, after the late 1990s, the declining of the Asian sea level pressure (SLP) and the deepening of the Lake Balkhash trough may induce more cold air from high latitudes to break out southward. The strengthening of the low-level southerly in East Asia could transport more moisture northward from low latitudes. More cold air and more warm-moist airflow encountering in the targeted region contribute to the increasing trend of local rainfall. The situation before the late 1990s is generally reversed, which accounts for the decreasing trend of autumn rainfall. The movement of the East Asian jet (EAJ) from southward to northward also has a contribution via its influence on dynamic condition. Additionally, changes in the sea surface temperatures (SSTs) in the western Indian and Atlantic Oceans from a cooling trend to a warming trend in the late 1990s play significant roles through their modulations on moisture transport and cold-air activities.
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DOI：
--
发表时间：
2004
期刊：
Plateau Meteorology
影响因子：
--
作者：
Bai Hu-zhi
通讯作者：
Bai Hu-zhi
影响因子：
--
作者：
Ma ZhuGuo
通讯作者：
Ma ZhuGuo
影响因子：
5.8
作者：
Huijun Wang
通讯作者：
Huijun Wang
影响因子：
64.8
作者：
Saji, NH;Goswami, BN;Yamagata, T
通讯作者：
Yamagata, T
影响因子：
4.9
作者：
P. Zhao;Song Yang;Huijun Wang;Qiang Zhang
通讯作者：
P. Zhao;Song Yang;Huijun Wang;Qiang Zhang