摘要
本研究基于青藏高原75个气象站点1970-2009年的地面气象观测数据,根据Penman-Monteith模型估算了高原参考蒸散发(ETref),分析了高原ETref的年、季节及月变化趋势,发现高原年和季节ETref呈明显下降趋势,年下降趋势为-0.6909mm/a;具有最大减少值的季节是4-6月,平均-0.1978mm/年,随后依次为7-9月,1-3月和10-12月.去趋势分析表明,风速的下降和净辐射的减少是ETref减少的主要原因;敏感性分析表明ETref对净辐射的变化最敏感,其次是相对湿度、风速和气温.
Based on the data of 75 meteorological stations on the Tibetan Plateau from year 1970-2009,we calculated reference evapotranspiration(ETref)by Penman-Monteith model and analyze the annual and seasonal as well as monthly ETreftrends.The results show that there is an obvious decrease trend in annual and seasonal ETrefchange.The annual decrease trend is-0.6909mm/a and the month with most apparent decrease trend is Apr.-Jun.,followed by Jul.-Sep.,Jan.-Mar.and Oct.-Dec..Detrended analysis suggest that the decline of wind speed and net radiation is the main reason of decrease in ETref.The sensitivity analysis show that ETrefis most sensitive to net radiation,followed by relative humidity,wind speed and temperature.
出处
《青海师范大学学报（自然科学版）》
2014年第4期52-59,共8页
Journal of Qinghai Normal University(Natural Science Edition)
基金
中国地震局兰州地震研究所基本科研业务(2013052)
国家自然科学基金资助项目(41302174)共同资助
关键词
气候变化
参考蒸散发
时空变化
风速下降
青藏高原
全球变暖
climate change
reference evapotranspiration
spatiotemporal change
decrease wind speed
Tibetan Plateau
global warming
