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Laboratory Analogue of the Quasi-Biennial Oscillation

准两年一次振荡的实验室模拟

基本信息

批准号：
2598736
负责人：
金额：
--
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2598736
关键词：
Laboratory Analogue Quasi Biennial Oscillation

项目摘要

In the equatorial stratosphere. between 5-100 hPa and 15 N-15 S, the dominant source of variability is an alternating pattern of descending eastward and westward wind regimes known as the Quasi-Biennial Oscillation (QBO). These zonal winds alternate with a period that varies between 22 and 34 months, averaging 28 months. The QBO is of significant interest to long term forecasting due to its direct and indirect influence on a wide range of phenomena including the stratospheric polar vortex (Baldwin et al., 2021), subtropical and midlatitude jet (Kidston et al., 2015), and tropical convection including the MJO (Son et al., 2017). Generally, an easterly QBO increases the chances of a weak midlatitude jet, sudden stratospheric warmings, and cold winters in the UK, while a westerly QBO increases the chances of a stronger jet and milder but stormier UK winters. Kelvin, Rossby-gravity, and shorter-length interval gravity waves produced at the equatorial tropopause propagate upwards through the stratosphere, and the associated wave-mean flow interaction generates the oscillating pattern. There is much existing theoretical framework for understanding these fundamental mechanisms, but there are many outstanding problems in current outstanding. The behaviour of the QBO and its underlying mechanisms is also relevant to the atmosphere of other planets. Similar oscillations (which pose similar questions) are observed on Jupiter (Li and Read, 2000) and Saturn (Fouchet et al., 2008).

在赤道平流层。在5-100 hPa和15 N-15 S之间，变率的主要来源是被称为准两年振荡（QBO）的东向和向西风态下降的交替模式。这些纬向风的交替周期在22至34个月之间，平均为28个月。由于QBO对包括平流层极涡（Baldwin et al.，2021），亚热带和中纬度急流（Kidston等人，2015），以及包括MJO在内的热带对流（Son et al.，2017年）。一般来说，东风QBO增加了英国出现弱中纬度急流、平流层突然变暖和寒冷冬季的机会，而西风QBO增加了英国出现较强急流和温和但多风暴冬季的机会。在赤道对流层顶产生的Kelvin、Rossby重力波和较短间隔的重力波向上传播通过平流层，相关的波-平均流相互作用产生振荡模式。现有的理论框架对这些基本机制的理解很多，但目前还存在许多悬而未决的问题。QBO的行为及其潜在机制也与其他行星的大气有关。在木星（Li和Read，2000年）和土星（Fouchet等人，2008年）。