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

大气块是对流层上层准静止的大尺度反气旋环流模式，它中断了中纬度地区的西风急流。由于阻塞气流的寿命相对较长，可长达数周，因此能够使沿着西风急流迁移的天气系统在同一地区停滞，有时会导致极端事件，如热浪，干旱和洪水。这个项目，建立在私家侦探的博士学位上。在论文研究中，研究了热带外块与Madden-Julian振荡（MJO）的联系，MJO是热带大气中一种显著的季节内（30-60天）变化形式。一个线性逆模型（LIM）的方法是用来识别热带非绝热加热异常与MJO，可以演变成阻塞流的extratropics。该研究可以通过展示特定区域的阻塞事件如何可以追溯到热带的MJO事件，从而对阻塞事件及其影响进行提前预警，从而对区域决策者有益。此外，该项目还为一名刚开始从事科学工作的博士后研究员提供支助，从而为该领域未来的科学工作者提供资金。

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.