2015/2016年冬季武汉MST雷达观测的异常中间层纬向风反转

IF 3.4 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Weifan Zhang, Li Chang, Yusong Qin, Xun Lu, Chao Qiu
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引用次数: 0

摘要

武汉MST雷达(29.51°N, 114.13°E)在2015/2016年冬季探测到一次与平流层突然变暖事件无关的纬向风反转。有趣的是,在风反转开始时捕获了平流层上层/中层下层(USLM)扰动。利用《现代回顾分析研究与应用》第2版再分析资料发现,纬向风异常逆转与PW2在中间层的活动增强有关。进一步的诊断分析表明,增强行星波(PWs)可能是在USLM期间由破碎的行星波发展而来。同时,30°-40°N的中间层包含与斜压/正压不稳定有关的附加波源。这些增强的PWs最终导致风的反转。此外,在逆风过程中,雷达处于恒定的负温度梯度和较冷区域,有利于逆风的持续。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Unusual Mesospheric Zonal Wind Reversal Observed by the Wuhan MST Radar During the Winter 2015/2016

Unusual Mesospheric Zonal Wind Reversal Observed by the Wuhan MST Radar During the Winter 2015/2016

An unusual zonal wind reversal unrelated to Sudden Stratospheric Warming events in the mesosphere is detected by the Wuhan MST radar (29.51°N, 114.13°E) during the winter of 2015/2016. Interestingly, an upper stratosphere/lower mesosphere (USLM) disturbance is captured at the beginning of the wind reversal. We find this abnormal zonal wind reversal is related to the enhanced activity of PW2 in the mesosphere by using Modern-Era Retrospective Analysis for Research and Applications version 2 reanalysis data. Further diagnostic analysis suggests that the enhanced planetary waves (PWs) may have developed from the broken PWs during the USLM. Simultaneously, the mesosphere of 30°–40°N contains additional wave sources associated with the baroclinic/barotropic instability. These enhanced PWs eventually cause the wind reversal. Additionally, during the wind reversal, the radar is in the position of constant negative temperature gradient and colder region, favoring the continuation of the wind reversal.

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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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