globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025535
论文题名:
Multiday evolution of convective bursts during western North Pacific tropical cyclone development and nondevelopment using geostationary satellite measurements
作者: Chang M.; Ho C.-H.; Park M.-S.; Kim J.; Ahn M.-H.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期:3
起始页码: 1635
结束页码: 1649
语种: 英语
英文关键词: MERRA ; MTSAT-1R ; multiday diurnal convective burst ; tropical cyclone ; tropical disturbance ; western North Pacific
Scopus关键词: atmospheric convection ; diurnal variation ; environmental disturbance ; latent heat flux ; MTSAT ; satellite data ; tropical cyclone ; troposphere ; vorticity ; Pacific Ocean ; Pacific Ocean (Northwest)
英文摘要: Tropical cyclones (TCs) develop through latent heating from a series of deep convection. To investigate the evolution of diurnal convective burst (CB) activities prior to TC formation, we analyzed 463 tropical disturbances that developed (80) or not developed (383) into TCs over the western North Pacific during the 2007–2009 period. Geostationary satellite data allowed defining deep convection where infrared (IR) brightness temperature is lower than that of water vapor (WV). Diurnal expansions from time series of IR minus WV < 0 areas near disturbance vortex centers for 5 days are defined as CB events. Combined analysis with the Modern Era Retrospective-Analysis shows that the multiday convective-environmental evolution for TC formation is entirely different from nonformation processes in terms of the occurrence of two consecutive diurnal CB events. Multiday CBs (mCB) are observed in 67.5% of the 80 TC formation cases and in 13.8% of the 383 nonformation cases. Intensities of the middle-to-low tropospheric relative vorticity of these two groups are comparable on 4 to 5 days prior to TC formation. However, vorticity intensification is weak for nondeveloping disturbances in environments of strong vertical wind shear; these disturbances eventually decay. The vorticity of developing disturbances continuously intensifies to TC strengths. The remaining 32.5% of the TC cases without mCB show weaker initial vorticity, but rapid intensification over 3 day periods before TC formation. The present results reveal that mCB is a common feature in pre-TC stages, and large-scale environments of weak vertical wind shear are critical for the formation of TC-strength circulations. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62704
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology, Ansan, South Korea; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Department of Atmospheric Science and Engineering, Ewha Womans University, Seoul, South Korea

Recommended Citation:
Chang M.,Ho C.-H.,Park M.-S.,et al. Multiday evolution of convective bursts during western North Pacific tropical cyclone development and nondevelopment using geostationary satellite measurements[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)
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