AGS-PRF: Atmospheric Blocking Variability Associated with the Madden-Julian Oscillation in Present and Future Climates

AGS-PRF：当前和未来气候中与马登-朱利安振荡相关的大气阻塞变化

• 批准号: 1624831
• 负责人: Stephanie Henderson
• 金额: $ 8.6万
• 依托单位: Henderson, Stephanie A
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-04-15 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1624831&HistoricalAwards=false
• 关键词: AGS; PRF; Atmospheric; Blocking; Variability

Atmospheric blocks are quasi-stationary large-scale anti-cyclonic circulation patterns in the upper troposphere that interrupt the westerly jet steam circulating in mid-latitudes. Due to their relatively long lifetimes of up to several weeks, blocking flows are capable of making weather systems that migrate along the westerly jet become stagnant over the same regions, sometimes causing extreme events such as heat waves, droughts, and floods. This project, building on the PI's Ph.D. dissertation research, investigates the connection of extratropical blocks to the Madden-Julian oscillation (MJO), a prominent intra-seasonal (30-60 days) form of variability in the tropical atmosphere. A linear inverse modelling (LIM) approach is used to identify tropical diabatic heating anomalies associated with MJO that can evolve into blocking flows in the extratropics. The research could be beneficial to regional decision makers by demonstrating how blocking events in a given region can be traced back to MJO events in the tropics, thus enabling advanced warning of blocking events and their impacts. In addition, the project supports a postdoctoral researcher who is at the beginning of her scientific career, thereby providing for the future scientific workforce in this area.

大气块是对流层上层准静止的大规模反气旋环流模式，中断了中纬度地区的西风急流蒸汽循环。由于其相对较长的生命周期（长达数周），阻塞流能够使沿着西风急流迁移的天气系统在同一地区停滞，有时会导致热浪、干旱和洪水等极端事件。该项目以 PI 的博士学位为基础。论文研究调查了温带地块与马登-朱利安振荡 (MJO) 的联系，马登-朱利安振荡是热带大气中一种重要的季节内（30-60 天）变化形式。线性逆建模 (LIM) 方法用于识别与 MJO 相关的热带非绝热加热异常，这种异常可能演变成温带阻塞流。该研究展示了如何将特定区域的阻塞事件追溯到热带地区的 MJO 事件，从而对阻塞事件及其影响进行提前预警，这可能对区域决策者有益。此外，该项目还为一名正处于科学职业生涯初期的博士后研究员提供支持，从而为该领域未来的科学劳动力提供支持。

项目成果

The Critical Role of Non-Normality in Partitioning Tropical and Extratropical Contributions to PNA Growth

• DOI: 10.1175/jcli-d-19-0555.1
• 发表时间: 2020-07
• 期刊: Journal of Climate
• 影响因子: 4.9
• 作者: S. A. Henderson;D. Vimont;M. Newman

The Impact of the Madden–Julian Oscillation on High-Latitude Winter Blocking during El Niño–Southern Oscillation Events

马登朱利安涛动对厄尔尼诺南方涛动期间高纬度冬季阻塞的影响

• DOI: 10.1175/jcli-d-17-0721.1
• 发表时间: 2018
• 期刊: Journal of Climate
• 影响因子: 4.9
• 作者: Henderson, Stephanie A.;Maloney, Eric D.
• 通讯作者: Maloney, Eric D.