城市对台风 "勒基玛"(2019)行星边界层风结构的影响

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Gengjiao Ye , Hui Yu , Xiangyu Ao , Xu Zhang
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引用次数: 0

摘要

城市对登陆热带气旋(TC)行星边界层(PBL)风结构的影响很少被探讨。本研究对台风 "勒基玛"(2019)进行了多层建筑效应参数化(BEP)和城市土地覆盖的数值模拟,以研究城市对热带气旋行星边界层风结构的影响。与观测数据的对比验证表明,包含多层建筑效应参数和城市地表的模拟能更好地再现 "利奇马 "的路径、强度和 10 米风场。在对有无城市地表覆盖的模拟进行比较的基础上,分析了城市效应,并从湍流传输的角度研究了可能的机制。结果表明,城市表面总体上对 TC 风场有减速效应。这种减速效应在地表附近最为明显,随着距离地面 1 公里以下高度的增加而减弱。城市表面减少了近表层的切向风和径向流入,导致热气流强度略有下降。这主要归因于近地层切向动量向下传递和径向动量向上传递的增强,从而导致由亚网格尺度(SGS)动量通量发散引起的负切向风倾向和正径向风倾向的幅度增大。此外,在抬高的 PBL 高度之上,切向风和径向外流更强,这与附近地区切向风和径向风趋势的增强十分吻合。分析表明,湍流传输为了解城市表面如何影响热带气旋的 PBL 风结构提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The urban effects on the planetary boundary layer wind structures of Typhoon Lekima (2019)
The urban effects on the planetary boundary layer (PBL) wind structures of landfalling tropical cyclones (TCs) have rarely been explored. In this study, numerical simulations for Typhoon Lekima (2019), with and without multilayer building effect parameterization (BEP) and urban land cover, were executed to investigate the urban effects on TC PBL wind structures. Validations against observations demonstrate that the simulation incorporating BEP and urban surface replicates the track, intensity and 10-m wind field of Lekima better. Based on the comparison between the simulations with and without urban land cover, urban effects were analyzed, and the possible mechanisms were examined from the perspective of turbulent transport. Results show that urban surfaces have a deceleration effect on TC wind fields overall. This deceleration effect is most pronounced near the surface and decreases with height under 1 km above ground level. Urban surfaces reduce tangential winds and radial inflow in the near-surface layer, leading to a slight decrease in TC intensity. This is primarily attributed to the enhanced downward transfer of tangential momentum and upward transfer of radial momentum within the PBL, which results in larger magnitudes of negative tangential wind tendencies and positive radial wind tendencies induced by the divergence of subgrid-scale (SGS) momentum fluxes. Additionally, stronger tangential winds and radial outflow above the elevated PBL height correspond well to the increased tangential and radial wind tendencies in nearby areas. The analysis illustrates that turbulent transport provides insights into how urban surfaces affect the PBL wind structures of TCs.
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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