Thresholds Determination and Characteristics Analysis of Short-time Heavy Rainfall in the Northeast Side of Qinghai Tibet Plateau

Journal of Arid Meteorology ›› 2021, Vol. 39 ›› Issue (4): 563-568.

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Thresholds Determination and Characteristics Analysis of Short-time Heavy Rainfall in the Northeast Side of Qinghai Tibet Plateau

YANG Zhenxin1, QI Ping2, SUN Lei2,CUI Xiaoping3, ZHAO Yuelan1

(1. Hezheng Meteorological Station of Gansu Province, Hezheng 731200, Gansu, China;
2. Linxia Meteorological Bureau of Gansu Province, Linxia 731100, Gansu, China;
3. Yongjing Meteorological Station of Gansu Province, Yongjing 731600, Gansu, China)

Online:2021-08-31 Published:2021-09-13

青藏高原东北侧短时强降水阈值确定及特征分析

杨振鑫1，祁萍2，孙磊2，崔小平3，赵月兰1#br#

(1.甘肃省和政县气象局，甘肃和政731200；2.甘肃省临夏回族自治州气象局，
甘肃临夏731100；3.甘肃省永靖县气象局，甘肃永靖731600）

通讯作者: 祁萍（1990— ），女，工程师，主要从事灾害性天气预报预警服务工作. Email: qp_lxqxt@163.com。
作者简介:杨振鑫（1983— ），男，工程师，主要从事县级综合气象业务和服务管理工作. Email: yzx12121@126.com。
基金资助:
甘肃省气象局气象科研项目人才专项（GSMArc2019-29）资助

Abstract

Key words: 青藏高原东北侧, 短时强降水, 阈值确定, 特征分析

摘要： 基于临夏州2006—2018年4—9月自动气象站逐日小时降水量，在传统降水百分位法、Z指数法和平方根变换法3种方法中，确定了短时强降水阈值的最佳计算方法，在此基础上分析临夏州短时强降水的时空分布特征。平方根变换法确定的临夏州短时强降水阈值为14.6 mm·h-1。临夏州短时强降水空间分布表现为自中南部分别向西北和东南减少，短时强降水年平均出现次数为7.3次，2018年出现次数最多；7—8月短时强降水出现频次最多，占短时强降水总频次的81.1%，8月达到最高峰，占总频次的55.8%；短时强降水日变化呈4峰分布，短时强降水主要出现在18：00—23：00，占短时强降水总频次的55.8%；小时最大降水量为55.8 mm，出现在22：00；短时强降水持续时间为1 h的占90.5%，同一时次出现1站次短时强降水的占93.3%，临夏州短时强降水多为阵发性，且空间分布多为孤立零散。

关键词: 青藏高原东北侧, 短时强降水, 阈值确定, 特征分析

CLC Number:

P481

YANG Zhenxin, QI Ping, SUN Lei, CUI Xiaoping, ZHAO Yuelan. Thresholds Determination and Characteristics Analysis of Short-time Heavy Rainfall in the Northeast Side of Qinghai Tibet Plateau[J]. Journal of Arid Meteorology, 2021, 39(4): 563-568.

杨振鑫, 祁萍, 孙磊, 崔小平, 赵月兰. 青藏高原东北侧短时强降水阈值确定及特征分析[J]. 干旱气象, 2021, 39(4): 563-568.

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Thresholds Determination and Characteristics Analysis of Short-time Heavy Rainfall in the Northeast Side of Qinghai Tibet Plateau

青藏高原东北侧短时强降水阈值确定及特征分析

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