1961—2016年祁连山区季节性干旱综合指数特征分析

doi:10.3969/j.issn.1673-503X.2019.01.012

气象与环境学报 ›› 2019, Vol. 35 ›› Issue (1): 88-93.doi: 10.3969/j.issn.1673-503X.2019.01.012

1961—2016年祁连山区季节性干旱综合指数特征分析

郭小芹¹, 罗永忠²

1. 武威市气象局, 甘肃武威 733000;
2. 甘肃农业大学林学院, 甘肃兰州 730030

收稿日期:2017-07-18 修回日期:2018-01-12 出版日期:2019-02-28 发布日期:2019-02-28
作者简介:郭小芹,女,1965年生,高级工程师,主要从事应用气象与生态研究工作,E-mail:gxq9179@126.com。
基金资助:
甘肃省气象局科研项目（2017-17）资助。

Study on characteristics of seasonal drought composite index in the Qilian Mountain area from 1961 to 2016

GUO Xiao-qin¹, LUO Yong-zhong²

1. Wuwei Meteorological Service, Wuwei 733000, China;
2. Forestry College of Gansu Agricultural University, Lanzhou 730070, China

Received:2017-07-18 Revised:2018-01-12 Online:2019-02-28 Published:2019-02-28

摘要/Abstract

摘要：

采用Z指数和熵权理论，构建了干旱综合指数作为干旱强度评价标准，对祁连山区季节性干旱特征及其空间分布规律进行了深入剖析。结果表明：1961-2016年季节性干旱强度普遍减弱，其中春秋两季显著减弱，夏季明显减弱；尽管20世纪60-70年代、90年代为季节性干旱频发与重发时段，但从2000年以来夏旱与冬旱却比较频繁，不容忽视。干旱强度由强到弱依次为冬季、夏季、春季和秋季，冬季干旱程度最强；在干旱波动性上秋季最强，冬季次之，春季最弱。春夏秋三季南侧比北侧干旱，冬季北侧比南侧干旱，其中冬季干旱范围最为广泛，尤以酒泉为中心的北侧区域最为显著。在研究时段内祁连山南北两侧干旱强度逐渐减弱，南侧明显减弱，枯草期干旱强度减弱程度尤为显著。本研究为祁连山区干旱评价提供了参考依据。

关键词: Z指数, 熵权赋值, 干旱综合指数, 季节性干旱

Abstract:

Based on Z index and entropy weight theory,the seasonal drought composite index was constructed to evaluate the drought intensity.Taken the Qilian Mountain area as an example,the characteristics and spatial distribution of seasonal drought were evaluated.The results show that drought intensity becomes weak from 1961 to 2016.The intensity of drought in spring and autumn is significantly weakened.The intensity of drought in summer is also weakened though it does not pass the significant test.In general,seasonal droughts are frequent and severe in the 1960s,1970s,and 1990s.However,the summer drought and winter drought become frequently since 2000,which should require to pay more attention.The drought intensity of four seasons sorted from severe to mild is winter,summer,spring,and autumn.In terms of drought variability,autumn is the strongest,followed by winter.Spring is the weakest.The south of the Qilian Mountains area is drier than the north in spring,summer and autumn,and vice versa in winter.Drought in winter is widespread,especially severe in the north of the Qilian Mountain area where Jiuquan is the center of this region.During the study period,the drought intensity becomes weak gradually in both north and south of the Qilian Mountain area.The drought intensity in the south becomes milder than that in the north.Drought intensity during the period of no-grass decreased significantly.This study provides a reference for the evaluation of drought in the Qilian Mountain area.

Key words: Z index, Entropy weight assignment, Drought composite index, Seasonal drought

中图分类号:

P467

郭小芹, 罗永忠. 1961—2016年祁连山区季节性干旱综合指数特征分析[J]. 气象与环境学报, 2019, 35(1): 88-93.

GUO Xiao-qin, LUO Yong-zhong. Study on characteristics of seasonal drought composite index in the Qilian Mountain area from 1961 to 2016[J]. Journal of Meteorology and Environment, 2019, 35(1): 88-93.

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1961—2016年祁连山区季节性干旱综合指数特征分析

Study on characteristics of seasonal drought composite index in the Qilian Mountain area from 1961 to 2016

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