Dew amounts and its correlations with meteorological factors in urban landscapes of Guangzhou, China
Dew amounts and its correlations with meteorological factors in urban landscapes of Guangzhou, China
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DOI：
10.1016/j.atmosres.2007.03.001
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发表时间：
2007-10
影响因子：
5.5
通讯作者：
You-hua Ye;K. Zhou;Liying Song;Jianhua Jin;S. Peng
中科院分区：
文献类型：
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作者：
You-hua Ye;K. Zhou;Liying Song;Jianhua Jin;S. Peng
中国，这项研究的目的是调查广州不同城市景观中的露量，并研究露量与气象因素的关系。结果表明，不同景观的晴夜露量不同。森林景观与居住景观(森林景观与商业景观、工业景观与居住景观)的平均露量差异显著。城市平均露量最高的是森林景观(0.034 mm夜间−1)，其次是工业景观(0.022 mm夜间−1)、商业景观(0.013 mm夜间−1)和居住景观(0.009 mm夜间−1)。对于最大露量，城市测量景观中的平均露量也存在类似的关系，其值依次为0.104 mm、0.08 mm、0.03 mm和0.109 mm。城市景观平均夜间露量−1和最大露量均显著低于农村(平均值0.077 mm，最大值0.224 mm)。平均露量与平均相对湿度呈正相关，与日蒸发量和城市热岛呈负相关。因此，城市森林景观是露水沉积的重要场所，城市环境不利于露水凝结，相对湿度、日蒸发量和城市热岛可能是影响城市露水量的3个最重要的气象因子。
The aim of this study was to investigate dew amounts in different urban landscapes and to examine the correlations between dew amounts and meteorological factors in Guangzhou, China. Results indicated that the dew amounts at fine night were different from landscapes to landscapes. A significant difference was found in average dew amounts between forest landscape and residential landscape (forest landscape and commercial landscape, industrial landscape and residential landscape). The highest mean dew amounts in urban area were observed in forest landscape (0.034 mm night−1), followed by industrial landscape (0.022 mm night−1), commercial landscape (0.013 mm night−1) and residential landscape (0.009 mm night−1), respectively. For maximum dew amounts, a similar relationship like the mean dew mounts was found in urban measured landscapes, whose values in turn were 0.104 mm, 0.08 mm, 0.03 mm and 0.109 mm, respectively. Both the mean dew amounts night−1and maximum dew amounts in urban landscapes were significantly less than those (0.077 mm in mean value and 0.224 mm in maximum value) in their countryside. The mean dew amounts correlated positively with mean relative humidity; meanwhile it correlated negatively with daily evaporation and urban heat island, respectively. It was therefore concluded that urban forest landscape was an important site for dew deposit, urban environment was not favorable for dew condensation, and relative humidity, daily evaporation and urban heat island might be the most important three meteorological factors responsible for the dew amounts in urban area.