PostDoctoral Research Fellowship

PI过去的研究已经确定了有利于北极对流层顶极地涡旋(TPV)发展的气象条件。这些大气特征可以是广泛的(10^3公里)和持续的(几天到几个月)，因此可能会影响大范围的环流和海冰运动。涡旋强度与大气水蒸气含量和潜热可获得性有关，在气候变暖、无冰的北极，这两项预计将显著增加。利用天气研究和预报(WRF)模式，将进行几项敏感性研究，以调查地表条件，包括变化的海冰覆盖、海表面温度、湍流通量和动力情景对涡旋增强的影响。第二组实验将侧重于了解社区大气模式(CAM)预测的近地表大气环流与热带气旋相关的变化，使用WRF模式与CAM强迫相结合，预计海冰将减少。这套组合的模拟活动将提供一个自下而上和自上而下的视角，了解这些常见但基本上未被探索的对流层上层特征与海冰复杂运动之间的联系。理想化的变暖情景将提供对这些涡旋潜在加剧的进一步洞察。

Past research by the PI has identified meteorological conditions favorable to the development of tropopause polar vortices (TPV) in the Arctic. These atmospheric features can be broad ((o) 10^3km) and persistent (days to months), thus potentially influencing large-scale circulation and sea ice movement. Vortex intensity is linked to atmospheric water vapor content and latent heat availability, which, in a warming, ice-free Arctic, are predicted to increase significantly. Using the Weather Research and Forecasting (WRF) model, several sensitivity studies will be run to investigate the influence of surface conditions, including varied sea ice cover, sea surface temperature, turbulent flux, and dynamical scenarios, on vortex intensification. A second set of experiments will focus on understanding the changes in near-surface atmospheric circulation, predicted by the Community Atmosphere Model (CAM), in relation to TPVs, using the WRF model in combination with CAM forcings resulting from projected reductions in sea ice. The combined set of modeling activities will provide a bottom-up and top-down view of the connection between these common, but largely unexplored, upper tropospheric features and the complex motion of sea ice. Idealized warming scenarios will provide further insight into the potential intensification of these vortices.