Original scientific paper

https://doi.org/10.17559/TV-20170727025640

A Novel method for monitoring urban dew condensation and its application

Yingying Xu ; Room E414, Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, No. 5088 Xin Cheng Road , Changchun, 130118, Jilin Province, P. R. China
Hui Zhu ; Room 412, Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, No. 4888 Shengbei Street, Changchun, 130102, Jilin Province, P. R. China
Xuejing Sun ; Room A307, Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, No. 5088 Xin Cheng Road , Changchun, 130118, Jilin Province, P. R. China
Qingling Meng ; Room E414, Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, No. 5088 Xin Cheng Road , Changchun, 130118, Jilin Province, P. R. China

Abstract

Dew is crucial moisture input for the water balance of urban ecosystems. Dew, which is an important environmental factor of urban ecosystem, can be easily absorbed by plant leaves and provide nutrients (N, P, and K) to plants. Moreover, dew formation is important in air purification. However, few internationally accepted standard methods or instruments are currently available for measuring dew amount in urban ecosystems because of the small dew amount. In order to accurately measure the night water vapour condensation and evaluate the effects of surface hardening to near-surface water cycle, this study monitored dew condensation and combined dew with leaf area index, and a novel method was proposed for monitoring and calculating dew amount in different underlying surfaces in urban ecosystems. The Changchun City in China was considered as an example and the proposed method was used to observe dew condensation in different functional areas of the city during the frost-free period (April 2016 to October 2016). Finally, the main meteorological factors affecting dew condensation were analyzed by summarizing the rule of vapour condensation; moreover, dew intensity and annual dewfall of different landscapes were obtained. Results indicate that greenbelt landscapes are important sites for dew deposition. The landscapes of dew intensity, in descending order, are greenbelt landscape, bare landscape, and road landscape (P < 0.01). Relative humidity is the main factor affecting water vapour migration. Dewfall amounts in the greenbelt, road, and bare landscapes are 61.43, 0.56, and 1.23 mm, respectively. The annual dewfall is 22.98 mm in Changchun according to the proportion of each landscape. The dew-monitoring method system in urban area is improved and the wet deposition from vapour condensation of different surfaces underlying at night is added. The method provides theoretical reference for further research on revealing the near-surface water cycle.

Keywords

dew intensity; dewfall; landscape; urban ecosystem

Hrčak ID:

188247

URI

https://hrcak.srce.hr/188247

Publication date:

25.10.2017.

Article data in other languages: croatian

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