摘要
利用1979-2018年辽宁省逐月风速资料和再分析资料,结合卫星遥感分类方法,并采用UMR(urban minus rural)方法和OMR(observation minus reanalysis)方法定量分析了城市化对辽宁省近地面风速的影响。研究表明:近40年辽宁省年和四季风速均呈减小趋势,城市站的减小速率明显快于乡村站,UMR值的变化趋势为-0.11 m·s^-1·(10 a)^-1,城市化影响贡献率为73.3%;空间分布上,辽宁中北部城市群减小趋势较明显,南部和东南部风速减小相对缓慢;UMR方法计算的城市化影响呈现自西向东逐渐增强的纬向分布形势。再分析资料的减小趋势与乡村站的减小趋势较接近,春季风速的减小速率最明显;OMR值的变化趋势为-0.10 m·s^-1·(10 a)^-1,对应的城市化影响贡献率为66.7%,利用两种方法计算得到的城市化影响和贡献率较一致,均能在一定程度上反映城市化对风速的影响。空间分布上,再分析资料显示渤海海峡风速呈微弱增加趋势,风速减小的高值区位于渤海北部和黄海北部。两种方法计算的城市化影响空间分布均呈现为西部和南部受城市化影响较小、中东部受城市化影响较大,一致性较好。
Using monthly wind speed data from 1979 to 2018 in Liaoning Province and reanalysis data,combined the UMR(urban minus rural)method and OMR(observation minus reanalysis)method combined with satellite remote sensing classification methods,this paper quantitatively analyzed the impact of urbanization of Liaoning Province on near-surface wind speed.The results show that in the past 40 years,the annual and four season wind speeds in Liaoning Province have shown a decreasing trend.The decreasing rate at urban stations is significantly faster than that at rural stations.The trend of UMR value(urban-rural anomaly)is-0.11 m·s^-1(10 a)^-1,and the contribution rate of urbanization impact is 73.3%.In spatial distribution,the decreasing trend of urban agglomerations in central and northern Liaoning is more obvious,and the wind speed decreases relatively slowly in the south and southeast.The urbanization impact calculated by UMR method shows increasing zonal distribution from west to east.The decreasing trend at the reanalysis data is closer to that of rural stations.The decreasing rate of wind speed in spring is the most obvious.The changing trend of OMR value is-0.10 m·s^-1·(10 a)^-1,and the corresponding urbanization impact contribution rate is 66.7%.The urbanization impact and contribution rate calculated by the two methods are relatively consistent,and both can reflect the impact of urbanization on wind speed to a certain extent.Reanalysis data show that the wind speed in the Bohai Strait has a slight increasing trend,and the high-value areas with reduced wind speed are located in the northern Bohai Sea and the northern Yellow Sea.In a word,the spatial distribution of the urbanization impact calculated by the two methods is that the western and southern regions are less affected by urbanization while the central and eastern regions are more affected and their consistency is better.
作者
敖雪
翟晴飞
崔妍
沈历都
周晓宇
赵春雨
朱玲
AO Xue;ZHAI Qingfei;CUI Yan;SHEN Lidu;ZHOU Xiaoyu;ZHAO Chunyu;ZHU Ling(Shenyang Regional Climate Center,Shenyang 110166;Liaoning Weather Modification Office,Shenyang 110166)
出处
《气象》
CSCD
北大核心
2020年第9期1153-1164,共12页
Meteorological Monthly
基金
2018年辽宁省气象局科研课题(BA201803)
辽宁省科学技术计划项目(2019-MZ-199和2019-ZD-0859)
中国气象局气候变化专项(CCSF202013)共同资助。
关键词
城市化
风速
气候变化
辽宁省
urbanization
wind speed
climate change
Liaoning Province
