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1961~2010年河北省地面风变化特征及成因探讨 预览 被引量:6

Change Characteristic and Its Forming Cause of Wind Speed in Hebei Province During 1961-2010
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摘要 利用1961~2010年河北省73个地面气象站风观测资料,结合NCEP/NCAR(2.5°×2.5°)月平均再分析资料和国家气候中心下发的环流指数,采用线性趋势拟合方法,分析地面风速的空间分布以及风速和最大主风向风频的时间变化特征,并对风速减小的成因进行探讨。结果表明:空间上风速呈东北西南向带状分布,依次有大、小、大3个风速带。年平均风速呈减小趋势,减小速率为0.207 m·s-1/10 a;3.0 m/s以下的风速日数呈明显增加趋势,8.0 m/s以上的日数呈显著减小趋势,3.0~8.0 m/s风速的日数没有明显变化趋势。代表站最大主风向为偏南风,最大主风向风频平均每年增加0.54 d。风速的减小与1980年代以后影响我国的环流经向度减小、西风指数增加有关,也与城市化效应的影响有关。 Based on wind speed observed data of 73 meteorological stations from 1961 to 2010 in Hebei Province,and combined monthly mean Northern Hemisphere circulation index data issued by National Climate Center and NCEP / NCAR monthly mean reanalysis data,the temporal and spatial distribution of surface wind speed and maximum prevailing wind direction frequency variation as well as the formation cause for wind speed decrease were discussed by using linear trend fitting method. The results show that,the maximum wind speed appeared in the northeast region of Hebei,the second largest wind speed appeared in the east coast and southeast area,and the smaller wind speed appeared in the middle region of Hebei Province. The annual mean wind speed presented descending trend from1961 to 2010 with a rate of 0. 212 m / s each decade. The days with wind speed less than 3. 0 m / s increased,but windy days with wind speed greater than 8. 0 m / s decreased,and when wind speed ranged from 3. 0 to 8. 0 m / s,there was no significant variation tendency for windy days. The maximum prevailing wind direction of representative stations was southwest or south,the southerly wind frequency increased by 0. 54 day every year on average. The decrease of wind speed in Hebei was mainly related to circulation factors such as westerly index increase,and influence of the urbanization effect.
作者 付桂琴 赵春生 张杏敏 谷永利 曹根华 FU Guiqin,ZHAO Chunsheng,ZHANG Xingmin,GU Yongli,CAO Genhua(1. Hebei Provincial Meteorological Service Center, Shifiazhuang 050021, China; 2. Department of Atmospheric Sciences, Peking University, Be~iing 100871, China; 3. Key Laboratory for Meteorology and Ecological Environment of Hebei Province, Shijiazhnang 050021, China; 4. Hebei Provincial Meteorology Information Center, Shijiazhttang 050021, China)
出处 《干旱气象》 2015年第5期815-821,共7页 Arid Meteorology
基金 公益性行业专项“华北地区大气水循环及空中水资源的潜势研究”(GYHY200906025) 国家973计划“气溶胶-云-辐射反馈过程及亚洲季风相互作用的研究”(2011出版03400)共同资助
关键词 地面风 时空分布 变化特征 成因探讨 wind speed temporal-spatial distribution change tendency formation cause
作者简介 付桂琴(1968-),女,高级工程师,主要从事环境等应用气象预报服务技术研究.E—mail:fgq84@tom.com
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