Sensitivity of the midlatitude waveguide to the dynamics and observations of Arctic tropopause-based vortices

GSTDTAP

项目编号	1461838
	Sensitivity of the midlatitude waveguide to the dynamics and observations of Arctic tropopause-based vortices
	Steven Cavallo
主持机构	University of Oklahoma Norman Campus
项目开始年	2015
	2015-08-01
项目结束日期	2018-07-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	298112(USD)
国家	美国
语种	英语
英文摘要	Heating due to infrared radiation is a great source of uncertainty in weather and climate prediction models, and high impact weather events are often strongly influenced by sub-synoptic-scale features that affect such heating. This proposal will closely examine specific processes active within tropopause polar vortices (TPVs) before they encounter the jet stream. Improved knowledge gained through detailed analysis of the processes, and their interactions with the jet stream, will lead to improvements in weather and climate prediction by improving their representation in numerical models. TPVs are unique because they can exist for long periods of time before affecting the jet stream, and are therefore a key feature to observe and accurately represent. The principal investigator will develop human capacity and teach students how to advance science through the entire spectrum of research. Quality-controlled datasets, developed during the course of the research, will be made openly available to the research community for use as a long-term tool for predictability studies. The proposed work would test the hypothesis: diabatic heating from radiation, coupled with weak deformation, is required to maintain the structure of tropopause polar vortices (TPVs) as they encounter increasing vertical shear associated with the waveguide. The project will use three approaches: (1) analyzing the statistical characteristics of TPVs based upon downstream impact, (2) isolating and identifying important physical processes important for TPV development and maintaining TPV intensity as they approach the waveguide through controlled numerical modeling experiments, and (3) diagnosing key uncertainties to identify specific methods of improving process representation in numerical models. Experiments will be conducted using the atmospheric version of the Model for Prediction Across Scales (MPAS) and parallel simulations using the Advanced Weather Research and Forecasting (ARW) model with the Data Assimilation Research Testbed (DART).
来源学科分类	Geosciences - Polar Programs
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68370
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Steven Cavallo.Sensitivity of the midlatitude waveguide to the dynamics and observations of Arctic tropopause-based vortices.2015.