1973—2016年德令哈市平均风速的变化特征分析

Variation characteristic analysis of the average wind speed in Delingha during 1973 to 2016

基于1973—2016年德令哈市国家基本气象站的平均风速、大风和沙尘日数数据,运用统计法、气候倾向法,分析了平均风速的变化特征,以及大风对沙尘天气的影响。结果表明:近44a来,春、夏、秋和冬季平均风速均呈现明显的减小趋势,气候倾向率分别为-0.349、-0.404、-0.399、-0.255(m·s^-1)/10a和-0.320(m·s^-1)/10a;平均风速的月变化呈现单峰式特点,各月平均风速均呈现明显的减小趋势。沙尘暴、扬沙和浮尘日数与大风日数均呈现显著的正相关,大风日数的减少影响沙尘天气的日数或强度。

Based on the average wind speed,strong wind and dust days data of the national basic meteorological observing station in Delingha during 1973 to 2016 by statistics and climate tendency method,This article analyzed variation characteristic of the average wind speed,and the strong wind on the impact of dust weather.The results show that the average wind speed in year,spring,summer,autumn and winter was obvious decrease in recent 44 years,the climate tendency rate was-0.349 m·s^-1 per 10 years,-0.404 m·s^-1 per 10 years,-0.399 m·s^-1 per 10 years,-0.255 m·s^-1 per 10 years and-0.320 m·s^-1 per 10 years.Monthly variation characteristic of the average wind speed take on unimodal characteristic,the average wind speed was obvious decrease in each month.Sand storm,blowing sand and floating dust had obviously positive correlation with strong wind,the decrease of strong wind affected on strength or days of the dust weather.