近50多年河西地区干热风事件时空变化特征

doi:10.13866/j.azr.2019.02.16

摘要/Abstract

摘要： 为探究全球变化背景下河西地区干热风事件的变化趋势和影响范围,根据河西地区春小麦国家气象行业标准,基于河西地区13个气象站1960—2017年6、7月的逐日最高气温和14:00相对湿度,分析干热风事件时空变化特征。结果表明:① 除海拔较高地区没有干热风事件发生外,其余地区均呈现增加趋势,且增长幅度有明显差异。在2000年之后重度干热风增加更为显著,干热风发生强度迅速增强。各年代干热风发生高值区未发生明显变动,发生天数却有明显变化。② 河西地区干热风空间分布为西多东少,北多南少。较低海拔地区达到干热风年型标准的年份较多。③ 一次干热风过程所波及的站点和持续时间增多和延长,干热风发生范围进一步扩大到更高纬度和更高海拔地区。

关键词: 干热风, 时空变化, 气候变化, 年型等级, 河西地区

Abstract: In this study, the spatiotemporal distribution and evolution of dry-hot wind events were analyzed. The purpose of the study was to explore the trends and impacts of dry-hot wind events in the Hexi region under the background of global change based on the national meteorological industry standards for spring wheat and the daily maximum temperature and relative humidity data from 13 meteorological stations in the Hexi region at 14:00 in June and July from 1960 to 2017. The results showed that: ① Dry-hot wind events were mainly in an increase trend except in the areas with high altitude, and their increase rates were significantly different. After 2000, the intensity of dry-hot wind increased rapidly, especially the heavy dry-hot wind. There was no obvious change in the areas with high occurring frequency in different decades, but the days of occurring dry-hot wind changed significantly; ② Dry-hot wind frequency was higher in the west and north than that in the east and south, and it was also high in the areas with low elevation; ③ The extent of occurring a dry-hot wind event was enlarged, its duration was prolonged, and dry-hot wind tended to the regions with higher latitudes and higher altitudes.

Key words: dry-hot wind, spatiotemporal variation, climate change, annul type grade, Hexi Region

候启, 张勃, 何航, 马彬,马尚谦. 近50多年河西地区干热风事件时空变化特征[J]. 干旱区研究, 2019, 36(2): 403-411.

HOU Qi, ZHANG Bo, HE Hang, MA Bin, MA Shang-qian. Spatiotemporal Variation of Dry-Hot Wind Events in the Hexi Region in Recent 50 Years[J]. Arid Zone Research, 2019, 36(2): 403-411.

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