Interactions of North Pacific Tropical, Midlatitude, and Polar Disturbances Resulting in Linked Extreme Weather Events over North America in October 2007
Interactions of North Pacific Tropical, Midlatitude, and Polar Disturbances Resulting in Linked Extreme Weather Events over North America in October 2007
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北太平洋热带、中纬度和极地扰动的相互作用导致 2007 年 10 月北美上空发生相关的极端天气事件
DOI：
10.1175/mwr-d-16-0230.1
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发表时间：
2017
影响因子：
3.2
通讯作者：
Archambault, Heather M.
中科院分区：
文献类型：
--
作者：
Bosart, Lance F.;Moore, Benjamin J.;Cordeira, Jason M.;Archambault, Heather M.
本研究利用观测和模式再分析，以研究多尺度过程与四个高影响的极端天气事件（EWEs）在北美2007年10月下旬。EWEs包括加州的风力野火，墨西哥与两次寒潮有关的长期异常寒冷条件，美国东部的暴雨以及墨西哥南部的严重洪水暴雨。EWEs涉及一个明显的大规模流动重新配置整个北太平洋和北美结合形成的高振幅Rossby波列。气流重构涉及到与极地、中纬度和热带扰动相关的北太平洋急流扰动，包括三个起源于东北亚的对流层极地扰动、短暂的热带气旋、非绝热罗斯比涡旋和西北太平洋热带气旋嘉治。欧拉和拉格朗日诊断表明，脊放大波列内加强与潜热释放沿着温暖的传送带植根于北太平洋的热带和亚热带。两个反气旋罗斯贝波打破事件在北美建立天气尺度的条件，支持EWE。结果突出了大尺度和天气尺度流如何演变，以促进多个地理上分离，但动态连接的EWE。根据结果，它是假设，在秋季北太平洋急流可能是特别有利于大规模的流量放大，可能导致EWE，在响应与热带，中纬度和极地扰动扰动。
This study uses observations and model reanalyses to examine the multiscale processes associated with four high-impact extreme weather events (EWEs) over North America during late October 2007. The EWEs consisted of wind-driven wildfires in California, prolonged anomalous cold conditions in Mexico linked to two cold surges, heavy rainfall in the eastern United States, and severe flood-producing heavy rainfall in southern Mexico. The EWEs involved a pronounced large-scale flow reconfiguration across the North Pacific and North America in conjunction with the formation of a high-amplitude Rossby wave train. The flow reconfiguration involved perturbations to the North Pacific jet stream linked to polar, midlatitude, and tropical disturbances, including three tropopause-level polar disturbances originating over northeastern Asia, transient extratropical cyclones, a diabatic Rossby vortex, and western North Pacific Tropical Cyclone Kajiki. Eulerian and Lagrangian diagnostics indicate that ridge amplification within the wave train was enhanced in connection with latent heat release along warm conveyor belts rooted in the tropics and subtropics over the North Pacific. Two anticyclonic Rossby wave breaking events over North America established synoptic-scale conditions that supported the EWEs. The results highlight how the large- and synoptic-scale flow can evolve to facilitate multiple geographically separated but dynamically linked EWEs. Based on the results, it is posited that during autumn the North Pacific jet stream may be particularly conducive to large-scale flow amplification, possibly resulting in EWEs, in response to perturbations associated with tropical, midlatitude, and polar disturbances.
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影响因子：
3.2
作者：
J. Keller;S. Jones;P. Harr
通讯作者：
J. Keller;S. Jones;P. Harr
影响因子：
8.9
作者：
C. Grams;H. Wernli;M. Böttcher;J. Čampa;U. Corsmeier;S. Jones;J. Keller;C. Lenz;L. Wiegand-
通讯作者：
C. Grams;H. Wernli;M. Böttcher;J. Čampa;U. Corsmeier;S. Jones;J. Keller;C. Lenz;L. Wiegand-
理想化三维非绝热罗斯贝涡旋的分析：潮湿斜压大气的相干结构
影响因子：
3.1
作者：
R. Moore;M. Montgomery
通讯作者：
M. Montgomery
巴西东南部的冷潮事件——潜在涡度的视角
DOI：
10.1002/joc.3618
发表时间：
2013
期刊：
International Journal of Climatology
影响因子：
--
作者：
M. Sprenger;O. Martius;J. Arnold
通讯作者：
J. Arnold
影响因子：
5.2
作者：
C. Grams;S. Lang;J. Keller
通讯作者：
C. Grams;S. Lang;J. Keller