三峡库区夏季旱涝变化特征及成因

刘晓冉; 程炳岩; 李国平

三峡库区夏季旱涝变化特征及成因

1.
重庆市气候中心, 重庆 401147
2.
中国科学院大气物理研究所, 北京 100029
3.
中国科学院研究生院, 北京 100049
4.
成都信息工程学院大气科学学院, 成都 610225

资助项目:

灾害天气国家重点实验室2009开放课题 2009LASW-A01

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出版历程
- 收稿日期: 2009-11-12
- 修回日期: 2010-07-07
- 刊出日期: 2010-10-31

Variation Characteristics and Causes of the Flood and Drought in the Three Gorges Area in Summer

1.
Chongqing Climate Center, Chongqing 401147
2.
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
3.
Graduate University of Chinese Academy of Sciences, Beijing 100049
4.
Department of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225

摘要

摘要: 利用1951—2008年三峡库区范围内10个国家基本站的夏季降水资料，通过Z指数分析了三峡库区夏季旱涝的变化特征，确定出6个严重涝年（1954，1956，1980，1982，1983年和1998年）和6个严重旱年（1959，1966，1972，1976，2001年和2006年）。结合NCEP/NCAR的再分析资料以及NOAA的OLR资料，对严重旱涝年份的大气环流形势进行合成分析。结果表明：三峡库区夏季旱涝变化具有较好的一致性，1979年经历了由旱到涝的年代际转变；2001年后，三峡库区进入偏旱阶段。三峡库区夏季严重涝年和旱年环流形势存在显著差异，当100 hPa南亚高压异常强大，500 hPa高度距平场欧亚高纬度地区从自西向东呈"－+－"距平波列分布，乌拉尔山和鄂霍次克海地区有持续性阻塞高压发展，西太平洋暖池对流偏弱，西太平洋副热带高压位置易偏南，三峡库区以南的西南水汽输送增强，使得三峡库区的水汽辐合增强，这种环流形势配合有利于三峡库区洪涝的发生，严重旱年则相反。
- 三峡库区;
- 旱涝;
- 水汽输送;
- 异常
Abstract: The Three Gorges area is located in the East Asian monsoon region. Under the influence of the monsoon activity, the precipitation of the Three Gorges area mainly concentrates on the period from June to August with relatively high variability, which is prone to the occurrence of the flood and drought disaster. The flood and drought of the Three Gorges area not only has a great impact on the lives of local residents and social activities, but also directly determines the operation and power generation efficiency of the Three Gorges Hydropower complex Project. As a result, the study of the variation characteristics and the formation of the flood and drought of the Three Gorges area is of great significance, providing a scientific decision base to prevent the disaster of flood and drought.
The temporal evolution of the drought and flood of the Three Gorges area in summer and its circulation patterns in the anomalous years are analyzed, obtaining a consistent result. The droughts occur frequently in the Three Gorges area in summer from 1951 to 1978. Following, there is a decadal abrupt change from the droughts to the floods in 1979. Then the floods are popular in the Three Gorges area from 1979 to 2000. Severe droughts take place frequently in the Three Gorges area after 2001. The circulation patterns are obviously different between in severe flood years and in severe drought years of the Three Gorges area. As for the severe flood years of the Three Gorges area, the South Asia High strengthens in 100 hPa, and there is a "－+－" wave train from the west to the east of the Eurasia high latitude area in 500 hPa height anomaly, which reflects that there are continuing block highs in the Okhotsk and Ural regions. Furthermore, the weaker convections over the Western Pacific Warm Pool make the West Pacific Subtropical High to shift southward. In addition, there is strengthening southwest water vapor transport from the Three Gorges area to the Indo China peninsula, which enhances the water vapor convergence in the Three Gorges area. These circulation patterns are advantageous to the genesis of the floods in the Three Gorges area.
- the Three Gorges area;
- flood and drought;
- transportation of water vapor;
- anomalies

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图 1 1951—2008年三峡库区夏季旱涝指数演变 (a) 及其滑动t检验曲线 (b)

Fig. 1 The change (a) and its moving t-statistic curve (b) of the flood and drought indexes of the Three Gorges area in summer from 1951 to 2008

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图 2 1951—2008年三峡库区夏季旱涝等级演变

Fig. 2 The change of the flood and drought grades of the Three Gorges area in summer from 1951 to 2008

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图 3 三峡库区夏季严重涝年和旱年同期100 hPa高度距平合成场和差值场 (单位:gpm)

(阴影区为通过0.1显著性水平检验; 矩形框为三峡库区)(a) 严重涝年, (b) 严重旱年, (c) 严重涝年与旱年的差值场

Fig. 3 The composite anomaly fields of 100 hPa height in summer of the Three Gorges area (unit:gpm)

(shaded areas denote passing the test of 0.1 level; the square frame is the Three Gorges area) (a) severe flood years, (b) severe drought years, (c) difference between severe flood and drought years

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图 4 三峡库区夏季严重涝年和旱年同期500 hPa高度距平合成场和差值场 (单位:gpm)

(阴影区为通过0.1显著性水平检验; 矩形框为三峡库区)(a) 严重涝年, (b) 严重旱年, (c) 严重涝年与旱年的差值场

Fig. 4 The composite fields of 500 hPa height anomaly in summer of the Three Gorges area (unit:gpm)

(shaded areas denote passing the test of 0.1 level; the square frame is the Three Gorges area) (a) severe flood years, (b) severe drought years, (c) difference between severe flood and drought years

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图 5 三峡库区夏季严重涝年和旱年同期整层水汽通量距平流场的合成场和差值场

(阴影区为通过0.1显著性水平检验; 矩形框为三峡库区) (a) 严重涝年, (b) 严重旱年, (c) 严重涝年与旱年的差值场

Fig. 5 The composite anomaly fields of the water vapour flux of total layers stream vector in summer of the Three Gorges area

(shade dareas denote passing the test of 0.1 level; the square frame is the Three Gorges area) (a) severe flood years, (b) severe drought years, (c) difference between severe flood and drought years

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图 6 三峡库区夏季严重涝年和旱年同期整层水汽通量散度距平合成场和差值场 (单位:10^-6kg·m^-2·s^-1)

(阴影区为通过0.1显著性水平检验; 矩形框为三峡库区) (a) 严重涝年, (b) 严重旱年, (c) 严重涝年与旱年的差值场

Fig. 6 The composite anomaly fields of the water vapour flux divergence of total layers in summer of the Three Gorges area (unit:10^-6 kg·m^-2·s^-1)

(shaded areas denote passing the test of 0.1 level; the square frame is the Three Gorges area) (a) severef lood years, (b) severe drought years, (c) difference between severef lood and drought years

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图 7 三峡库区夏季旱涝指数与同期东亚地区OLR场的相关分布 (阴影区为通过0.05显著性水平检验; 矩形框为三峡库区)

Fig. 7 The correlation distribution between the flood, drought indexes of the Three Gorges area in summer and the OLR over East Asian in summer (shaded areas denote passing the test of 0.05 level; the square frame is the Three Gorges area)

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表 1 旱涝等级划分

Table 1 Grades of drought and flood

表 2 1951—2008年三峡地区10个台站夏季降水Z指数与区域平均降水Z指数之间的相关系数

Table 2 The correlations between Z index of each stationin the Three Gorges area and the mean of Z index in summer rainfall from 1951 to 2008

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