Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China
An urban canopy’s humidity significantly affects thermal comfort, public health, and building energy efficiency; however, it remains insufficiently understood. This study employed 3-year (2020–2022) fixed measurements from Guangzhou to investigate the temporal patterns of relative humidity (RH), vap...
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MDPI AG
2024-12-01
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| author | Xiao Tan Qi Zhang Yiqi Chen Junsong Wang Lihua Zhao Guang Chen |
| author_facet | Xiao Tan Qi Zhang Yiqi Chen Junsong Wang Lihua Zhao Guang Chen |
| author_sort | Xiao Tan |
| collection | DOAJ |
| description | An urban canopy’s humidity significantly affects thermal comfort, public health, and building energy efficiency; however, it remains insufficiently understood. This study employed 3-year (2020–2022) fixed measurements from Guangzhou to investigate the temporal patterns of relative humidity (RH), vapor pressure (Ea), and vapor pressure deficit (VPD) across eight local climatic zones (LCZs). Clear and distinct patterns in the humidity characteristics among the LCZs were revealed on multiple timescales. The <i>RH</i> and <i>VPD</i> of each zone were higher in summer than in winter, with peak RH observed in LCZ A (83.45%) and peak <i>VPD</i> in LCZ 3 (13.6 hPa). Furthermore, a significant daytime urban dry island (UDI) effect in the summer and a nighttime urban moisture island (UMI) effect in the winter were observed in terms of the Ea difference between urban and rural areas. The strongest UMI occurred during winter nights in LCZ 8, with a peak intensity of 0.8 hPa, while the UDI was more frequent during summer days in LCZ 1, with a maximum value of −1.2 hPa; meanwhile, compact areas had a slightly higher frequency of UDI than open areas. Finally, the effects of the urban heat island (UHI) and wind speed (<i>V</i>) on UMI were analyzed. During the daytime, a weak correlation was observed between the UHI and UMI. Wind enhanced the intensity of the nighttime UMI. This research offers further insights into the canopy humidity characteristics in low-latitude subtropical cities, thereby contributing to the establishment of a universal model to quantify the differences in moisture between urban and rural areas. |
| format | Article |
| id | doaj-art-d9521b1452df456ca43c68f0641488a2 |
| institution | Kabale University |
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| publishDate | 2024-12-01 |
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| spelling | doaj-art-d9521b1452df456ca43c68f0641488a22025-01-10T13:16:01ZengMDPI AGBuildings2075-53092024-12-011519510.3390/buildings15010095Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, ChinaXiao Tan0Qi Zhang1Yiqi Chen2Junsong Wang3Lihua Zhao4Guang Chen5School of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou 510090, ChinaSchool of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou 510090, ChinaSchool of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou 510090, ChinaSchool of Architecture, South China University of Technology, Guangzhou 510640, ChinaSchool of Architecture, South China University of Technology, Guangzhou 510640, ChinaSchool of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou 510090, ChinaAn urban canopy’s humidity significantly affects thermal comfort, public health, and building energy efficiency; however, it remains insufficiently understood. This study employed 3-year (2020–2022) fixed measurements from Guangzhou to investigate the temporal patterns of relative humidity (RH), vapor pressure (Ea), and vapor pressure deficit (VPD) across eight local climatic zones (LCZs). Clear and distinct patterns in the humidity characteristics among the LCZs were revealed on multiple timescales. The <i>RH</i> and <i>VPD</i> of each zone were higher in summer than in winter, with peak RH observed in LCZ A (83.45%) and peak <i>VPD</i> in LCZ 3 (13.6 hPa). Furthermore, a significant daytime urban dry island (UDI) effect in the summer and a nighttime urban moisture island (UMI) effect in the winter were observed in terms of the Ea difference between urban and rural areas. The strongest UMI occurred during winter nights in LCZ 8, with a peak intensity of 0.8 hPa, while the UDI was more frequent during summer days in LCZ 1, with a maximum value of −1.2 hPa; meanwhile, compact areas had a slightly higher frequency of UDI than open areas. Finally, the effects of the urban heat island (UHI) and wind speed (<i>V</i>) on UMI were analyzed. During the daytime, a weak correlation was observed between the UHI and UMI. Wind enhanced the intensity of the nighttime UMI. This research offers further insights into the canopy humidity characteristics in low-latitude subtropical cities, thereby contributing to the establishment of a universal model to quantify the differences in moisture between urban and rural areas.https://www.mdpi.com/2075-5309/15/1/95urban moisture islandcanopy humiditylocal climate zonefixed measurementtemporal characteristic |
| spellingShingle | Xiao Tan Qi Zhang Yiqi Chen Junsong Wang Lihua Zhao Guang Chen Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China Buildings urban moisture island canopy humidity local climate zone fixed measurement temporal characteristic |
| title | Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China |
| title_full | Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China |
| title_fullStr | Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China |
| title_full_unstemmed | Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China |
| title_short | Assessing the Air Humidity Characteristics of Local Climate Zones in Guangzhou, China |
| title_sort | assessing the air humidity characteristics of local climate zones in guangzhou china |
| topic | urban moisture island canopy humidity local climate zone fixed measurement temporal characteristic |
| url | https://www.mdpi.com/2075-5309/15/1/95 |
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