PostDoctoral Research Fellowship

博士后研究奖学金

• 批准号: 1019302
• 负责人: Steven Cavallo
• 金额: $ 14.4万
• 依托单位: Cavallo, Steven M
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1019302&HistoricalAwards=false
• 关键词: PostDoctoral; Research; Fellowship

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.

PI过去的研究已经确定了有利于北极对流层顶极涡（TPV）发展的气象条件。 这些大气特征可以是广泛的（（o）10^3公里）和持续的（几天到几个月），从而可能影响大规模的环流和海冰运动。 涡旋强度与大气水蒸气含量和潜热可用性有关，在变暖的无冰北极地区，预计这两个因素会显著增加。 将利用天气研究和预报模式进行几项敏感性研究，以调查表面条件对涡旋增强的影响，包括不同的海冰覆盖率、海面温度、湍流通量和动力情景。 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的变化，与TPV有关，使用WRF模型结合预测海冰减少产生的CAM强迫。 建模活动的组合将提供一个自下而上和自上而下的视图，这些常见的，但在很大程度上未经探索，对流层上部的功能和海冰的复杂运动之间的联系。 理想化的变暖情景将为这些涡旋的潜在加剧提供进一步的见解。