| 李博渊,赵江伟,李新豫.新疆北部暖季短时强降水的时空分布特征[J].沙漠与绿洲气象,2021,15(2):34~41 |
| 新疆北部暖季短时强降水的时空分布特征 |
| LI Boyuan 1,2, ZHAO Jiangwei 2,LI Xinyu2 |
| 投稿时间：2020-04-20 修订日期：2020-06-30 |
| DOI：10.12057/j.issn.1002-0799.2021.02.005 |
| 中文关键词: 新疆北部 短时强降水 时空分布 统计特征 |
| 英文关键词:Northern Xinjiang short-time heavy rainfall temporal and spatial distribution statistical characteristics |
| 基金项目:国家重点研发计划重点专项(2018YFC1507103)、中亚大气科学研究基金(CAAS201921)共同资助。 |
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| 中文摘要: |
| 基于新疆北部518个自动站2013～2019年暖季逐时降水资料，运用常规统计、归一化及其偏离程度、分区域统计及降水集中度（PCD）和集中期（PCP）等方法 ，研究该区短时强降水（flash heavy rain，FHR）时空分布和统计特征。结果表明：（1）近7a新疆北部FHR发生频次年变化大，2016年最多，2014年最少，前者是后者的3.9倍。（2）FHR集中发生在6～7月，6月下旬为峰值，且日变化呈明显的单峰型，峰值主要在17:00～19:00。（3）FHR发生频次集中在山脉的迎风坡和喇叭口地形附近。（4）FHR PCD 呈现由南向北、由西向东逐渐集中，以阿勒泰地区为最集中； PCP自伊犁河谷至天山北坡，从克拉玛依向西、向北逐渐推迟，阿勒泰地区最晚。(5) PCD伊犁河谷、天山北坡年变化呈增大的趋势，其它区域呈减小的趋势。PCP阿勒泰地区、博州、天山北坡年变化呈增大趋势，其它区域呈减小的趋势。 |
| 英文摘要: |
| Based on the hourly precipitation data of 518 automatic stations in the warm season from 2013 to 2019 in the north of Xinjiang. Using conventional statistics, normalization and its deviation degree, sub regional statistics and precipitation concentration degree(PCD) and concentration period(PCP)，and other methods.The spatial-temporal distribution and statistical characteristics of flash heavy rain(flash heavy rain，FHR) in this area are studied. The results show that: (1) In the past seven years, the annual frequency of FHR has changed greatly in Northern Xinjiang, with the most in 2016 and the least in 2014, and the former is 3.9 times higher than the latter. (2) FHR mainly occurs from June to July, it peaked in late June, and the daily variation is unimodal, the peak value was mainly from 17:00 to 19:00. (3) The frequency of FHR is concentrated near the windward slope and the bell mouth of the mountain. (4) FHR PCD is gradually concentrated from south to North and from west to East, Altay is the most concentrated; PCP is from Ili River Valley to the north slope of Tianshan Mountain, From Karamay to the West and North, it was gradually delayed, Altay is the latest. (5) Annual change of PCD in the valley of Ili and the north slope of Tianshan Mountain are increasing, other areas showed a decreasing trend. Annual change of PCD showed an increasing trend in Altay area, Bozhou, northern slope of Tianshan Mountain, other trends are decreasing. |
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