珠江入海口高速路面温度的日变化特征

Characteristics of Diurnal Variation of Road Surface Temperature of an Expressway at the Estuary of Pearl River

利用南沙道路监测气象站2014年5月至2016年6月逐分钟气温、降水、路面温度等数据,分析了珠江入海口高速公路(莞佛高速)路面温度夏、冬半年日变化特征以及晴、雨天状况下的不同表现,结果表明:路面温度的日变化趋势基本与气温保持一致,但路面温度始终高于气温,白天路面最高温度可达57℃,比同期日最高气温高24. 5℃;路面温度极端最低为5℃。在夏半年,路面温度平均比冬半年高10℃。受海风及其带来的水汽影响,路面温度与气温的温差在白天和夜间有别于其他学者研究的高速路面温度的结论。晴雨天气时,路面温度在雨天变化缓慢,日较差在3. 2℃。

With minute-by-minute data of air temperature （AT） and rainfall and road surface temperature （RST） from roadside monitoring sites in Nansha District from May 2014 to June 2016, the winter-half and summer-half year characteristics of diurnal variation of RST for an expressway （from Dongguan to Fosban） at the estuary of Pearl River as well as their performance under fine-sky and rainy conditions are studied. The result is shown as follows. The diurnal variation of RST was generally consistent with that of AT but the RST was always higher than the AT, with the highest value of the RST as large as 57℃ during daytime,24.5℃ higher than maximum AT for the same period. The extreme minimum RST was 5℃. During the summer-half year, the RST was higher than in the winter-half year on average. Due to the effect of sea breeze and the water vapor it carried, differences between the RST and AT, in both daytime and nighttime, were different from the conclusions drawn by other researchers. The RST varied slowly during rainy clays with diurnal difference at 3.2℃.