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MISU Research Seminar | Cheng You

Response of the Sea Breeze to Urbanization in Pearl River Delta

by Cheng You
PhD student at the Department of Meteorology (MISU)

Time: 1 November 2018, 14h15–15h15
Venue: Rossbysalen C609, Arrhenius Laboratory, 6th floor

Abstract
The Pearl River Delta (PRD) region has undergone rapid urbanization since the 1980s, which has had significant effects on the sea-breeze circulation in this region. Because the sea-breeze plays an important role in pollutant transportation and convective initiation in the PRD region, it is meaningful to study the effects of urbanization on the sea-breeze.
In this study, three numerical experiments were conducted from 2 June to 31 August 2010 with land-use data from 1988, 1999, and 2010. For each simulation, characteristics of the sea-breeze such as the start time, end time, intensity, height, pumping ability, and inland penetration distance were quantified. By comparing the characteristics of the sea-breeze in these simulations, its response to urbanization was quantified. The results show that urbanization enhances the duration, height, and intensity of the sea-breeze but blocks its inland penetration.
One physical mechanism is proposed to dynamically elucidate the response of the sea-breeze to urbanization. Because the urban area in the PRD region is concentrated near the coast, urbanization imposes a positive heating gradient on the coastal region and a negative heating gradient on the region further inland. The positive heating gradient may intensify the sea-breeze, and the negative heating gradient may prevent the sea-breeze from propagating further inland.

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