Dynamics of Anticyclogenesis

与阻塞事件相关的动力学仍然不清楚，目前的操作预测技能较低。该项目将研究存在于中高纬度地区地表和地表以上的反气旋动力学。利用国家环境预测中心（NCEP）的重新分析，PI和他的学生将检验(1)对流层上层冷空气平流在地球表面附近反气旋的形成和加强中的相对重要性；(2)对流层中反气旋周围的阻塞、偏东气流发展过程中的形变；(3)阻塞和对流层中反气旋发展中的非准地转过程。本文将根据NCEP再分析整理出反气旋气候学资料，并选取个案作详细分析。使用准地变和非地变高度趋势方程的诊断将被应用于检查所建议的过程在发展和维持这些反气旋中的重要性。这个项目的结果有可能增加对阻塞事件发生的理解，并提高它们的预测技能。这项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.