Sensitivity of urban rainfall to anthropogenic heat flux: A numerical experiment
| Autor: | Christopher Claus Holst, Chi-Yung Tam, Johnny C. L. Chan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Convection
010504 meteorology & atmospheric sciences Turbulence Planetary boundary layer 0208 environmental biotechnology Magnitude (mathematics) 02 engineering and technology Forcing (mathematics) Atmospheric sciences Spatial distribution 01 natural sciences 020801 environmental engineering Geophysics Flux (metallurgy) Climatology General Earth and Planetary Sciences Environmental science Precipitation 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 43:2240-2248 |
| ISSN: | 0094-8276 |
| DOI: | 10.1002/2015gl067628 |
| Popis: | In this paper we investigate the sensitivity of local precipitation statistics to surface heat fluxes in an urban subdomain in the Pearl River Delta region, which is situated along the coast of south China. By conducting simulations of a past record-breaking rainfall event with a cloud-resolving model, we found that rainfall rates and the spatial distribution of accumulated rainfall are very sensitive to imposed urban surface heat fluxes. Diagnostics of the planetary boundary layer show increasing fluctuations of turbulence and buoyant turbulence production with increasing surface heat emission, causing increased near-surface mixing and convection. Heavy precipitation rates show a higher sensitivity than lighter rates. The extreme tail of the distribution is hence more affected. This study serves as an example of how sensitive the magnitude of local high impact weather phenomena can be to local forcing. |
| Databáze: | OpenAIRE |
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