Dynamics of Anticyclogenesis

与阻挡事件相关的动态仍不清楚，目前的作战预测技能较低。PI将研究存在于中高纬度表面及其上方的反气旋的动力学。利用美国国家环境预测中心(NCEP)的再分析，PI和他的学生将研究(1)对流层高层冷空气平流在近地表反气旋的形成和加强中的相对重要性；(2)阻塞发展中的变形，围绕中层反气旋的东风流动；(3)非准地转过程在阻塞和中层反气旋的发展中的作用。反气旋的气候学将从NCEP再分析中汇编出来，并选择案例进行详细分析。使用准营养和非准地转高度趋势方程的诊断学将被用来检验所建议的过程在发展和维持这些反气旋方面的重要性。这个项目的结果有可能增加对阻塞事件发生的理解，并提高对阻塞事件的预测技能。本研究将为研究生提供良好的教育机会。

The dynamics associated with blocking events remain unclear and current operational predictions have low skill. The PI will study the dynamics of anticyclones that exist both at and above the surface over middle and high latitudes. Using reanalyses from the National Centers for Environmental Prediction (NCEP), the PI and his students will examine the relative importance of (1) upper tropospheric cold-air advection in the formation and intensification of anticyclones near the earth's surface; (2) deformation in the development of blocking, easterly flow around midtropospheric anticyclones; and (3) nonquasigeostrophic processes in the development of blocking and midtropospheric anticyclones. A climatology of the anticyclones will be compiled from NCEP reanalysis and cases chosen for detailed analysis. Diagnostics using the quasigeotrophic and nonquasigeostrophic height tendency equations will be applied to examine the importance of the suggested processes in developing and maintaining these anticyclones. Results from this project have the potential to increase the understanding of the onset of blocking events and increase the forecast skill of them. The research will provide good educational opportunities for graduate students.