Simulating urban heat islands and local winds in the Dhaka metropolitan area, Bangladesh

IF 6 2区 工程技术 Q1 ENVIRONMENTAL SCIENCES
Abeda Tabassum, Seong-Ho Hong, Kyeongjoo Park, Jong-Jin Baik
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引用次数: 0

Abstract

Weather and climate changes due to urbanization are of great concern. This study examines urban effects on thermal and wind environments in the Dhaka metropolitan area, Bangladesh. For this, simulations for a case of hot days with weak synoptic forcing are performed using the Weather Research and Forecasting (WRF) model. The differences between the urban and no-urban simulations are analyzed. In the urban simulation, the daytime sensible (latent) heat flux is considerably increased (reduced) and convective activities are enhanced. The nighttime (0000–0500 LST) urban heat island (UHI) is much stronger than the daytime (1200–1700 LST) UHI. In the daytime, the UHI effect on local winds is more important than the urban surface roughness effect. In the nighttime, the relative importance of the UHI and urban surface roughness effects differs depending on the region for given prevailing winds. Impacts of increases in anthropogenic heat and urban size are examined. As the anthropogenic heat increases, the UHI and the UHI effect on local winds strengthen. As the urban size increases, the UHI and the UHI effect on local winds strengthen and the surface roughness effect appears in wider areas. This study provides further insights into urban effects on local winds.
模拟孟加拉达卡大都市区的城市热岛和当地风
城市化导致的天气和气候变化令人非常担忧。本研究考察了城市对孟加拉国达卡大都市区热环境和风环境的影响。为此,使用天气研究与预报(WRF)模式对一个天气强迫较弱的炎热天气进行了模拟。分析了城市和非城市模拟的差异。在城市模拟中,白天感(潜热)热通量明显增加(减少),对流活动增强。夜间(0000 ~ 0500 LST)城市热岛比白天(1200 ~ 1700 LST)城市热岛强得多。在白天,热岛对局地风的影响比城市地面粗糙度的影响更重要。在夜间,城市热岛效应和城市地表粗糙度效应的相对重要性因给定盛行风的区域而异。研究了人为热量增加和城市规模增加的影响。随着人为热量的增加,热岛效应和热岛效应对局地风的影响增强。随着城市规模的增大,热岛效应和热岛效应对局地风的影响增强,地表粗糙度效应在更大范围内出现。这项研究为城市对当地风的影响提供了进一步的见解。
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来源期刊
Urban Climate
Urban Climate Social Sciences-Urban Studies
CiteScore
9.70
自引率
9.40%
发文量
286
期刊介绍: Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]
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