CAJ | 학술논문

利用杭州20个自动气象站逐时数据计算2006年四季各站平均热岛强度,用薄盘样条函数法研究杭州城市热岛的空间变化,发现:夏秋季时较强,而春冬季强度较弱;总体趋势是杭州市丰体城区最大,向外辐散,逐渐减弱.利用2006年2月～2007年2月逐时气象数据,结合Morlet小波变换方法分析了杭州热岛周期变化特征,发现:其在频域上具有多尺度的周期振荡,尺度主要是24 h(日)、168 h(周)和1 490 h(2月).以日为周期的热岛强度与局地气候系统、地面长波辐射、近地层热量交换、人为热的日周期变化有关;而以周为周期的热岛强度变化成因主要与人类活动及城市大气污染物排放的"周末效应"有显著的关系;以2个月为周期的变化特征与一些较大尺度的自然变化相关.结果表明,杭州城市热岛时空变化是天气系统、地面长波辐射、下垫面、大气污染、人为热、人类活动、近地层热量交换等共同作用的结果.
이용항주20개자동기상참축시수거계산2006년사계각참평균열도강도,용박반양조함수법연구항주성시열도적공간변화,발현:하추계시교강,이춘동계강도교약;총체추세시항주시봉체성구최대,향외복산,축점감약.이용2006년2월～2007년2월축시기상수거,결합Morlet소파변환방법분석료항주열도주기변화특정,발현:기재빈역상구유다척도적주기진탕,척도주요시24 h(일)、168 h(주)화1 490 h(2월).이일위주기적열도강도여국지기후계통、지면장파복사、근지층열량교환、인위열적일주기변화유관;이이주위주기적열도강도변화성인주요여인류활동급성시대기오염물배방적"주말효응"유현저적관계;이2개월위주기적변화특정여일사교대척도적자연변화상관.결과표명,항주성시열도시공변화시천기계통、지면장파복사、하점면、대기오염、인위열、인류활동、근지층열량교환등공동작용적결과.
The purpose of this research is to analyze the spatial and temporal variations of urban heat island in Hangzhou. The data for the research was based on the hour-by-hour data from Feb, 2002 to Feb, 2007, and was collected from 20 automatic weather sites of Hangzhou. In the first step, the data was processed with partial thin plate smoothing splines. In the second step, the Morlet wavelet analysis was used to analyze the periodic variations of urban heat island in Hangzhou. It is found that the heat island intensity in Hangzhou was greater in the summer and autumn than in the other seasons. The intensity peaked in the center of Hangzhou, and declined gradually away from the city center. The major time scales were daily, weekly, and bimonthly periods. The daily period was influenced by the diurnal variations in local climate system, long-wave radiation, the surface heat exchanges, and anthropogenic heating; the weekly period was affected by the weekend effect of the human activities and urban air pollutant emissions; the bimonthly period was affected by large scale natural variation, such as solar radiation and weather system.In summary, the temporal-spatial variation if Hangzhou urban heat island was greatly affected by the coactions of weather system, long-wave radiation, underlying surface, atmospheric pollutant, anthropogenic heating, and heat exchanges on earth surface.