| 西南地区干旱的变化特征及其与大气环流的关系 |
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| 引用本文： | 谢清霞,谷晓平,万雪丽,李刚,刘彦华,张艳梅,吴磊.西南地区干旱的变化特征及其与大气环流的关系[J].干旱区地理,2020,43(1):79-86. |
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| 作者姓名： | 谢清霞 谷晓平 万雪丽 李刚 刘彦华 张艳梅 吴磊 |
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| 作者单位： | 1.贵州省气象台，贵州贵阳550002；2 贵州省山地气候与资源重点实验室，贵州贵阳550002 |
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| 基金项目： | 中国气象局预报员专项(CMAYBY2016-065)；贵州省气象局开放基金黔气科合(KF(2016)11) |
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| 摘 要： | 选用1962—2017年（10月~次年5月）西南地区（四川、贵州、云南和重庆市）90 个地面气象观测台站的逐日降水和日平均气温实测气象要素资料,运用综合气象干旱指数WTBX](CI)WTBZ]统计出西南地区累计干旱日数和频次，并分析两者近56 a来的时空变化特征，再挑选其高、低值年进行大气环流形势讨论，最后制作差值图（均为高值年减低值年）与相关场构造的图进行比较。研究结果表明：累计干旱日数和频次均呈逐渐降低的趋势；两者的年代距平在20世纪60年代~80年代同为正，而在20世纪90年代同为负，其后21世纪初两者距平则相反；累计干旱日数具有5 a和9 a的年际周期变化，12 a的年代际周期，干旱频次具有8
a左右的年际周期和20 a的年代际周期；两者均在四川西部地区和云南中北部为大值中心，云南西部、重庆和贵州中东部为小值中心；高、中和低层的环流形势也缺少水汽和系统抬升等配置关系。
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| 关 键 词： | 综合气象干旱指数(CI) 时空分布 大气环流 |
| 收稿时间： | 2019-03-29 |
Characteristics of drought variation and its relationship with general circulation of southwest China |
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| XIE Qing-xia,GU Xiao-ping,WAN Xue-li,LI Gang,LIU Yan-hua,ZHANG Yan-mei,WU Lei.Characteristics of drought variation and its relationship with general circulation of southwest China[J].Arid Land Geography,2020,43(1):79-86. |
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| Authors: | XIE Qing-xia GU Xiao-ping WAN Xue-li LI Gang LIU Yan-hua ZHANG Yan-mei WU Lei |
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| Institution: | 1
The Meteorological Observatory in Guizhou Province,Guiyang
550002,Guizhou,China;
2 Key Laboratory of
Mountain Climate and Resources in Guizhou Province,Guiyang 550002,Guizhou,China |
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| Abstract: | The cumulative dry days and
the drought frequency are calculated using the meteorological drought composite
index (CI) based on the data
about daily precipitation and daily average temperature
collected from 90 meteorological stations in Southwest China (Sichuan, Yunnan, Guizhou Province and
Chongqing City) during the time period from 1962 to 2017.Using the wavelet
analysis and linear trend, the temporal and
spatial variation of cumulative dry days and frequency in the span of 56 years
are analyzed in detail. In addition, the atmospheric circulation profiles of the years with
lower and higher value are investigated too using correlation and composition
analysis. The conclusions are
summarized as follows: (1) The overall trend of cumulative dry days and frequency
are gradually decreased, the decade anomaly
between the two is positive correlated from 1960s to 1980s, negative correlated in 1990s and positive correlated
again at the beginning of the 21st century. (2) The duration (the
accumulative dry days) has an inter-annual variation period of 5 years and 9 years, and a decade-wise variation period of 12 years. The drought frequency has an inter-annual variation period of 8 years and a decade-wise variation period of 20 years. (3) The duration
and frequency have the same center area with higher values including the west
Sichuan and the middle and north Yunnan, and the same center area with lower values including
the west of Yunnan, the middle and east
of Guizhou and Chongqing. (4) The relevant circulation analysis indicated it is
to the disadvantage of precipitation in the region if without water vapor and
the uplift dynamics in each of the high, middle and low layers atmospheric circulation. |
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| Keywords: | meteorological drought composite index (CI) temporal and spatial distribution atmospheric circulation |
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