Dynamics of Anticyclogenesis

与阻塞事件相关的动态仍然不清楚，目前的业务预测水平很低。PI将研究中高纬度地区地表和地表以上存在的反气旋的动力学。利用国家环境预报中心（NCEP）的再分析，PI和他的学生将研究（1）对流层上部冷空气平流在近地表反气旋形成和加强中的相对重要性;（2）对流层中部反气旋周围阻塞东风流发展中的变形;阻塞和对流层中部反气旋发展过程中的非准地转过程。反气旋的气候学将根据NCEP的再分析和选择的案例进行详细分析。诊断使用准地转和nonquasigeostrophic高度趋势方程将被应用到研究的重要性，建议的过程中发展和维持这些反气旋。该项目的结果有可能增加对阻塞事件发生的理解，并提高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.