干旱区研究

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2021 , Vol. 38 >Issue 3: 724 - 732

DOI: https://doi.org/10.13866/j.azr.2021.03.14

天气与气候

西藏地区潜在蒸散量时空格局特征及影响因素研究

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  • 1.西藏自治区气候中心,西藏 拉萨850000
    2.西藏自治区气象信息网络中心,西藏 拉萨850000
    3.中国气象局气象干部培训学院,北京100081
史继清（1988-）,女,工程师,硕士研究生,从事农业气象灾害与遥感方面的研究. E-mail: 549923050@qq.com

收稿日期: 2020-03-12

  修回日期: 2020-05-16

  网络出版日期: 2021-06-17

基金资助

第二次青藏高原综合科学考察研究项目(2019QZKK0105);第二次青藏高原综合科学考察研究项目(2019QZKK0106);西藏自治区自然科学基金(XZ202001ZR0033G);西藏自治区科技计划项目(XZ202001ZY0023N)

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Temporal and spatial pattern characteristics of potential evapotranspiration in Tibet and its influencing factors

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  • 1. Tibet Climate Center, Lhasa 850000, Tibet, China
    2. Information and Internet Center of Tibet Meteorological Bureau, Lhasa 850000, Tibet, China
    3. China Meteorological Administration Training Centre, Beijing 100081, China

Received date: 2020-03-12

  Revised date: 2020-05-16

  Online published: 2021-06-17

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摘要

利用1981—2018年西藏地区38个气象站点的逐日气象观测资料,采用联合国粮农组织Food and Agriculture Organization of the United Nations（FAO）推荐的Penman-Monteith公式估算了各站点的潜在蒸散量（ET0）,分别从趋势性、突变性以及周期性分析了ET0的时空变化格局及其影响因素。结果表明：在时间尺度上,西藏地区ET0均表现出先“下降”后“升高”的趋势,其中“下降”阶段ET0整体呈显著的降低趋势（除冬季外）,“升高”阶段呈显著的增加趋势（除春、夏季）。在空间尺度上,春、夏季表现出减少和秋冬季、年际表现出增加的趋势。发生突变的站点主要分布在中南部和东北部区域,时间集中在20世纪80年代;年均ET0变化的第一主周期为33 a（2013年）。此外,平均风速和相对湿度是影响年及季节ET0的主要因素,同时平均风速、相对湿度和最高温度对ET0的影响趋势具有很强的一致性。

关键词： 西藏; 潜在蒸散量; 趋势性; 偏相关; 影响因素

本文引用格式

史继清,豆永丽,杨霏云,戴睿,胡军 . 西藏地区潜在蒸散量时空格局特征及影响因素研究[J]. 干旱区研究, 2021 , 38(3) : 724 -732 . DOI: 10.13866/j.azr.2021.03.14

Abstract

This study estimated potential evapotranspiration (ET0) from 38 meteorological stations in Tibet. We collected the data from daily observations from 1981 to 2018 and analyzed it using the FAO’s Penman-Monteith formula. The temporal and spatial patterns of ET0 and its influencing factors were analyzed separately from trend, sudden change, and periodicity. This study showed that within the time frame, ET0 in Tibet decreased and then increased, and there was a significant decrease (except winter) and increase (except spring and summer). Spatially, there was a significant decrease during spring and summer, while in autumn, winter, and interannual, there was a significant increase. The mutation sites were mainly in the South-Central and North Eastern regions, and the time concentration was in the 1980s. The first major cycle of annual average ET0 change may be 33 a(2013 year). Also, average wind speed and relative humidity were the dominant ET0 factors in the years and seasons. Simultaneously, the influence trend of average wind speed, relative humidity, and maximum temperature on ET0 was consistent.

Key words： Tibet; potential evapotranspiration; tendency; partial correlation; influencing factors

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