| 与华北地区春季降水量异常关联的大气环流异常 |
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| 引用本文： | 陆日宇.与华北地区春季降水量异常关联的大气环流异常[J].气候与环境研究,2001,6(4):400-408. |
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| 作者姓名： | 陆日宇 |
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| 作者单位： | {{each article.affiliations aff i}}
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| 基金项目： | 中国科学院"九五"重大应用基础研究项目"中国华北地区水资源变化及其调配研究"第二课题(编号:ZK951-A1-203-02)以及中国科学院重点研究项目"ENSO对东亚气候异常的影响及其物理过程的研究"(编号:ZK952-S1-404) |
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| 摘 要： | 华北地区的春旱极大地影响着农作物的播种和生长.因此,尽管华北地区的春季1降水量没有夏季降水量那么多,但它的变化规律及其原因也是一个非常值得研究的问题.在本文中,我们指出,相对平均值而言,华北地区春季降水量的年际变化相当大.早年降水量的变化幅度相对较小,而降水多的年份之间降水量却有相当大的变化.进而,我们分析了在年际变化时间尺度上,与华北地区春季降水异常相关联的大尺度大气环流异常.发现在华北春季降水多时,东亚地区上空在整个对流层中存在一反气旋式环流异常,即与季节演变特征相符,而在热带地区存在与季节演变相反的环流异常.东亚地区上空这种反气旋式环流使得东亚大槽偏东、偏弱,并使得在我国东部地区出现南风异常,这种南风异常一直达到华北地区,为华北地区的降水提供有利条件.此外,反气旋式异常随高度向西斜,也为扰动的发展提供了有利的环流背景.本文对对流层高层经向风的分析结果表明,与华北春季降水密切相关的东亚地区反气旋式环流异常和南北风异常与出现在北半球中纬地区的波列有关系,但关于该波列产生的原因却有待进一步的研究.
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| 关 键 词： | 华北 降水量 大气环流异常 年际变化 |
| 修稿时间： | 2000年2月25日 |
Atmospheric Circulation Anomaly Associated with the Spring Rainfall Anomaly in North China |
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| Lu Riyu.Atmospheric Circulation Anomaly Associated with the Spring Rainfall Anomaly in North China[J].Climatic and Environmental Research,2001,6(4):400-408. |
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| Authors: | Lu Riyu |
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| Abstract: | The spring droughts in North China greatly effect the sowing and growing of crops. Thus, the variation of spring rainfall in North China and its reason should be studied, although the rainfall in spring is less than that in summer in North China. This study shows that the interannual variation of spring rainfall in North China is great, comparing with the mean. The variation amplitude of precipita-tion is smaller among drought years, while is larger among flood years. Furthermore, we analyzed the large-scale atmospheric circulation anomaly associated with the spring rainfall anomaly in North China on the interannual timescale. It is found that there is an anticyclonic circulation anomaly at the whole troposphere over East Asia in flood spring, i.e., being consistent with the seasonal tendency. In the trop-ics, however, the associated circulation anomaly is contrast to the seasonal tendency. The anticyclonic anomaly over East Asia is related to eastward shifted and weaker East Asian trough, and related to southerly anomaly over eastern China that extends poleward into North China and is favorable to rain-fall in North China. In addition, the anticyclonic anomaly exhibits a westward tilt with height, which is favorable to the development of disturbances. The analysis on the meridional velecity at upper troposphere shows that the associated anticyclonic anomaly and southerly anomaly is related to a wave train in the Northern Hemisphere middle latitudes. The mechanism for the wave train, however, is unknown and need to be studied further. |
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| Keywords: | North China precipitation atmospheric circulation anomaly interannual variation |
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