Influence of Fog-Haze on Dew Condensation in Urban Areas
In recent years, fog-haze weather has frequently occurred in urban ecosystem, with accompanied dew condensation in the surface layer. Dew formation plays an important role in air purification, which takes fine aerosols in the atmosphere as the condensation nuclei. However, the influence of fog-haze...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
2018-01-01
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| Series: | Tehnički Vjesnik |
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| Online Access: | https://hrcak.srce.hr/file/298286 |
| _version_ | 1797207630148534272 |
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| author | Yingying Xu Hui Zhu Yuepeng Pan Jing Xie |
| author_facet | Yingying Xu Hui Zhu Yuepeng Pan Jing Xie |
| author_sort | Yingying Xu |
| collection | DOAJ |
| description | In recent years, fog-haze weather has frequently occurred in urban ecosystem, with accompanied dew condensation in the surface layer. Dew formation plays an important role in air purification, which takes fine aerosols in the atmosphere as the condensation nuclei. However, the influence of fog-haze on dew condensation remains unclear. Thus, this study aims to evaluate the influences of fog-haze days on the frequency, intensity, and duration of dew condensation, to reveal the factors relevant to dew condensation during weather pollution, and to improve the air quality in fog-haze days. The monitor-based direct weighing method was employed in this study to observe the vapour condensation in urban greenbelt under fog-haze and normal weather conditions during the frost-free season (April-October 2017) in Changchun, China. The differences in dew condensation intensity and frequency were discriminated under different weather conditions. Then, the influences of fog-haze days on the vapour condensation were analyzed by monitoring the velocity and duration of dew condensation in polluted weather. Finally, a program for improving air quality was proposed based on the analysis of major meteorological factors that affect the dew condensation during the fog-haze days. Results show that the dew condensation velocity decreases significantly (P < 0.01) from 0.0067 mm/h in normal weather to 0.0026 mm/h in a fog-haze day, whereas the condensation duration is prolonged. The dew condensation intensities are 0.064, 0.045, and 0.051 mm/d under fog, haze, and normal weather conditions, respectively, and the fog-haze weather has no significant effect on the frequency or intensity of dew condensation (P > 0.05). The particulate matter concentration, wind speed, air pressure, relative humidity, and solar radiation are the main factors that affect the vapour transport during the fog-haze days. Artificial increase of surface layer vapours can promote the particulates to absorb vapours fully and settle to the ground in the form of dew, thereby reducing the particulate matter concentration within the scope of human activities. The present study supplements the eigenvalues for dew condensation in urban areas during special pollution periods and reveals the influence of fog-haze on the night time vapour condensation in urban areas. Findings of this study provide theoretical basis for further developing the programs for controlling fog-haze weather and improving urban air quality. |
| first_indexed | 2024-04-24T09:25:58Z |
| format | Article |
| id | doaj.art-b4ab777c781442998ea73a58a10ba27d |
| institution | Directory Open Access Journal |
| issn | 1330-3651 1848-6339 |
| language | English |
| last_indexed | 2024-04-24T09:25:58Z |
| publishDate | 2018-01-01 |
| publisher | Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek |
| record_format | Article |
| series | Tehnički Vjesnik |
| spelling | doaj.art-b4ab777c781442998ea73a58a10ba27d2024-04-15T14:53:57ZengFaculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in OsijekTehnički Vjesnik1330-36511848-63392018-01-0125387688310.17559/TV-20180515175046Influence of Fog-Haze on Dew Condensation in Urban AreasYingying Xu0Hui Zhu1Yuepeng Pan2Jing Xie3Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Room E414, No. 5088 Xin Cheng Road, Changchun, 130118, Jilin Province, ChinaKey Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Room 405, No. 4888 Sheng Bei Road, Changchun, 130102, Jilin Province, ChinaState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Room 306, Beijing 100029, ChinaKey Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Room E304, No. 5088 Xin Cheng Road, Changchun, 130118, Jilin Province, ChinaIn recent years, fog-haze weather has frequently occurred in urban ecosystem, with accompanied dew condensation in the surface layer. Dew formation plays an important role in air purification, which takes fine aerosols in the atmosphere as the condensation nuclei. However, the influence of fog-haze on dew condensation remains unclear. Thus, this study aims to evaluate the influences of fog-haze days on the frequency, intensity, and duration of dew condensation, to reveal the factors relevant to dew condensation during weather pollution, and to improve the air quality in fog-haze days. The monitor-based direct weighing method was employed in this study to observe the vapour condensation in urban greenbelt under fog-haze and normal weather conditions during the frost-free season (April-October 2017) in Changchun, China. The differences in dew condensation intensity and frequency were discriminated under different weather conditions. Then, the influences of fog-haze days on the vapour condensation were analyzed by monitoring the velocity and duration of dew condensation in polluted weather. Finally, a program for improving air quality was proposed based on the analysis of major meteorological factors that affect the dew condensation during the fog-haze days. Results show that the dew condensation velocity decreases significantly (P < 0.01) from 0.0067 mm/h in normal weather to 0.0026 mm/h in a fog-haze day, whereas the condensation duration is prolonged. The dew condensation intensities are 0.064, 0.045, and 0.051 mm/d under fog, haze, and normal weather conditions, respectively, and the fog-haze weather has no significant effect on the frequency or intensity of dew condensation (P > 0.05). The particulate matter concentration, wind speed, air pressure, relative humidity, and solar radiation are the main factors that affect the vapour transport during the fog-haze days. Artificial increase of surface layer vapours can promote the particulates to absorb vapours fully and settle to the ground in the form of dew, thereby reducing the particulate matter concentration within the scope of human activities. The present study supplements the eigenvalues for dew condensation in urban areas during special pollution periods and reveals the influence of fog-haze on the night time vapour condensation in urban areas. Findings of this study provide theoretical basis for further developing the programs for controlling fog-haze weather and improving urban air quality.https://hrcak.srce.hr/file/298286condensation intensitycondensation perioddewfog-haze dayparticle |
| spellingShingle | Yingying Xu Hui Zhu Yuepeng Pan Jing Xie Influence of Fog-Haze on Dew Condensation in Urban Areas Tehnički Vjesnik condensation intensity condensation period dew fog-haze day particle |
| title | Influence of Fog-Haze on Dew Condensation in Urban Areas |
| title_full | Influence of Fog-Haze on Dew Condensation in Urban Areas |
| title_fullStr | Influence of Fog-Haze on Dew Condensation in Urban Areas |
| title_full_unstemmed | Influence of Fog-Haze on Dew Condensation in Urban Areas |
| title_short | Influence of Fog-Haze on Dew Condensation in Urban Areas |
| title_sort | influence of fog haze on dew condensation in urban areas |
| topic | condensation intensity condensation period dew fog-haze day particle |
| url | https://hrcak.srce.hr/file/298286 |
| work_keys_str_mv | AT yingyingxu influenceoffoghazeondewcondensationinurbanareas AT huizhu influenceoffoghazeondewcondensationinurbanareas AT yuepengpan influenceoffoghazeondewcondensationinurbanareas AT jingxie influenceoffoghazeondewcondensationinurbanareas |