Compound Tropical Cyclone Heat (TC-Heat) Hazard in Hong Kong: Amplifying Urban Heat Extremes With Storm Position-Driven Peripheral Warming and Urban Footprint

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Geophysical Research: Atmospheres Pub Date : 2024-11-03 DOI:10.1029/2024JD041037
Jeffrey Man-Hei Chang, Yun Fat Lam, Yat-Chun Wong, Kai Kwong Hon
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Abstract

Compound hazards involving tropical cyclones and extreme heat (“TC-heat”) have rarely been examined in prior research. Peripheral subsidence associated with cyclones can warm an area to varying degrees, depending on the cyclone's strength and position. Meanwhile, the peripheral airflow also overwhelmed the land-sea breeze circulation system in coastal cities and favored downwind urbanized heat advection on the Southern China coastline. Here, we systematically applied ERA5 global reanalysis data, local surface-level observations, MODIS-based land-cover data and HYSPLIT backward trajectories to evaluate how the position of distant TCs may divert the monsoon system and foster the surface heat advection from upwind urban agglomerate amplifying air temperature in downwind coastline. The analysis suggests when a distant TC is situated in a favorable area (the vicinity of Taiwan and Luzon Strait) at roughly 500–1,250 km to the east of Hong Kong, it forms a unique meteorological condition which allows the surface heat transport from the Greater Bay Area to Hong Kong, reflecting that regional build-up of heat could be an important mechanism for producing local heat extremes.

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香港的复合热带气旋热(TC-Heat)危害:利用风暴位置驱动的外围暖化和城市足迹放大城市极端热量
以往的研究很少对涉及热带气旋和极端高温("TC-heat")的复合危害进行研究。与气旋相关的外围下沉会根据气旋的强度和位置对一个地区造成不同程度的增温。同时,外围气流也会压迫沿海城市的海陆风环流系统,有利于华南沿岸城市化热量的下沉。在此,我们系统地应用了ERA5全球再分析资料、本地地表观测资料、基于MODIS的陆地覆盖资料和HYSPLIT后向轨迹,评估了远距离TC的位置可能如何使季风系统转向,并促进上风城市群的地表热量平流放大下风海岸线的气温。分析结果显示,当远处的热带气旋位于香港以东约 500 至 1,250 公里的有利地区(台湾和吕宋海峡附近)时,会形成一个独特的气象条件,让大湾区的地表热量输送到香港,反映区域性的热量积聚可能是产生本地极端高温的重要机制。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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