渤海湾西岸海陆风特征对城市热岛响应的观测分析  

Response of sea and land breeze characteristics to urban heat island over the west coast of Bohai Bay

作　　者：许启慧[1] 苗峻峰[1] 刘月琨 黄利萍 王蝶[1] 

机构地区：[1]南京信息工程大学大气科学学院,南京210044 [2]天津市气象局,天津300074 [3]亳州市气象局,安徽亳州236806

出　　处：《气象科学》2013年第4期408-417,共10页Journal of the Meteorological Sciences

基　　金：公益性行业(气象)科研专项经费项目(GYHY201306009);教育部留学回国人员科研启动基金项目(教外司留[2009]1590号)

摘　　要：利用2008年全年渤海湾西岸(天津)14个自动气象站逐小时资料和6 h一次的地面常规资料,采用统计分析的方法,研究了天津城市热岛效应对渤海湾西岸海陆风的影响。结果表明:在冷岛和强热岛条件下,渤海湾西岸海风的发生频率较低,强热岛阻碍了海风向内陆的传播;内陆站在弱热岛条件下出现最大海风的频次较高,但其海风强度与无热岛或冷岛状况下相比要小一些;城市热岛效应的出现,推迟了城市周围郊区站海风的开始时间,缩短了海风的持续时间;城市站的海风风速与热岛强度呈负相关关系,但热岛效应对陆风风速的影响较强,陆风风速在热岛强度小于2.6℃时,随着其值的增大而减小,反之则增加;当海风向内陆延伸时,热岛强度会在午后海风盛行时段内增强,并与传播到此处的海风环流叠加,导致近地层海风风速增强,并可西伸至城市中心。By using observation data from 14 automatic weather stations in Tianjin and conventional data from every 6 h surface meteorological stations, the effect of urban heat island （ UHI ） on sea-land breeze （SLB） over the west coast of Bohai Bay during 2008 is analyzed with statistical analysis method. The result shows that the frequency of SLB is very low in both weak and strong UHI conditions, reason is that the strong UHI blocks the penetration of the sea breeze. Among all ground stations, the highest fre- quency of maximum wind speed of sea breeze appears in Jinnan station, the probability of which is higher in weak heat island intensity. UHI delays the starting time of sea breeze appearance and shortens the du- ration. A negative correlation, exists between the UHI and sea breeze speed. When the heat island inten- sity is less than 2.6 ℃, the decrease of UHI intensity leads to the increase of land-breeze speed, and vice versa in urban station like Tianjin. Furthermore, when the sea breeze extends inland, the heat island intensity increases during the period of prevalent sea breeze and is overlaid with sea breeze ctrculation here, which leads to the increase of surface-layer wind flow and its westward spreading to the center of the city.

关 键 词：海陆风 城市热岛 统计分析 

分 类 号：P461.8[天文地球—大气科学及气象学]