摘要
香港天文台近年的研究显示,香港的气温上升是由温室效应增强所导致的全球变暖及本地高密度城市发展的共同影响。除温度外,香港因受城市化影响,相对湿度在城市与郊区之间亦有很明显的差异。选取1989—2006年较能代表香港市区与郊区情况的气象站每小时气温和相对湿度数据,初步比较了香港市郊温度和相对湿度差异的日变化和季节变化,并试图分析这些差异变化与城市化影响的关系。结果显示郊区的气温变化幅度比市区大、变化也较突然,市区晚间至清晨气温较郊区为高;日间情况大致逆转,但气温差别幅度不及晚间。一年之中,城市化效应在冬季最为显著,春季则最不明显。市郊相对湿度的差异同样很明显。晚间至清晨市区相对湿度较郊区为低,日间相反。
Recent studies carried out by the Hong Kong Observatory show that the rising trends of air temperature in Hong Kong are influenced by both the global warming due to enhanced greenhouse effect and the high density urban development in Hong Kong.Apart from temperature,urbanization also brings about obvious differences between the urban and rural areas in respect of relative humidity.The scope of the present study includes the selection of representative urban and rural meteorological stations in Hong Kong so that the temperature difference between those chosen urban and rural stations can be utilized to quantify the effect of urbanization.By making use of some 20 years＇ hourly temperatures and relative humidity data,this study preliminarily compared the diurnal variations and seasonal variations of the differences in temperatures and relative humidity between urban and rural stations,and try to analyze the relationship between these differences and urbanization.
出处
《气象》
CSCD
北大核心
2009年第2期71-79,共9页
Meteorological Monthly
关键词
城市化效应
气温
相对湿度
urbanization effect air temperature relative humidity
