Urban UV environment in a sub-tropical megacity – A measurement and modelling study
| Autor: | Peter K.N. Yu, Pok-Man Chan, Ka-Ming Wai |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
integumentary system
Meteorology General Physics and Astronomy 010501 environmental sciences Atmospheric sciences 01 natural sciences lcsh:QC1-999 Aerosol Ground level 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Megacity Environmental science lcsh:Physics 0105 earth and related environmental sciences |
| Zdroj: | Results in Physics, Vol 7, Iss, Pp 2705-2710 (2017) |
| ISSN: | 2211-3797 |
| DOI: | 10.1016/j.rinp.2017.07.055 |
| Popis: | The variations of solar total UV (UVA + UVB) exposure rates in a megacity featured with high-rise buildings during summer months were measured and relevant model predictions were evaluated. The maximum pedestrian-level total solar UV exposure rate was less than the un-obstructed exposure rate at any time, attributing to the prevailing reduction in the diffuse solar radiation due to the obstruction effects of distant buildings. Comparing with the measurements, our coupled model well captured the spatial and temporal variations of the reduction of UV exposure rates. By measurements, large reduction in the solar total UV exposure rate down to 12% of un-obstructed exposure rate due to the building obstruction effects was found, agreeing with our previous simulation results and results from an Australian megacity. On the other hand, building reflection from reflective curtain walls could reach 23% of the un-obstructed solar total UV exposure rate at the ground level. This implied improper building design creating additional harmful effects of solar UV radiation on the environment. The coupled model was also applied to predict the urban UV exposure rates during a tropical-cyclone induced aerosol episode. A well-evaluated urban solar UV model is an important tool for sustainable urban design. |
| Databáze: | OpenAIRE |
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