Variations in Amplitudes and Wave Energy along the Energy Dispersion Paths for Rossby Waves in the Quasigeostrophic Barotropic Model  

作　　者：Yaokun LI Jiping CHAO Yanyan KANG 

机构地区：[1]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China [2]National Marine Environmental Forecasting Center,Beijing 100081,China [3]Beijing Meteorological Observatory,Beijing 100089,China

出　　处：《Advances in Atmospheric Sciences》2022年第6期876-888,共13页大气科学进展（英文版）

基　　金：This study was jointly funded by the National Natural Science Foundation of China(Grant Nos.41805041 and 41505042);the National Program on Global Change and Air-Sea Interaction(GASI-IPOVAI-03);the National Basis Research Program of China(2015CB953601 and 2014CB953903);the Fundamental Research Funds for the Central Universities.

摘　　要：Variations in wave energy and amplitude for Rossby waves are investigated by solving the wave energy equation for the quasigeostrophic barotropic potential vorticity model.The results suggest that compared with rays in the nondivergent barotropic model,rays in the divergent model can have enhanced meridional and zonal propagation,accompanied by a more dramatic variability in both wave energy and amplitude,which is caused by introducing the divergence effect of the free surface in the quasigeostrophic model.For rays propagating in a region enclosed by a turning latitude and a critical latitude,the wave energy approaches the maximum value inside the region,while the amplitude approaches the maximum at the turning latitude.Waves can develop when both the wave energy and amplitude increase.For rays propagating in a region enclosed by two turning latitudes,the wave energy approaches the minimum value at one turning latitude and the maximum value at the other latitude,while the total wavenumber approaches the maximum value inside the region.The resulting amplitude increases if the total wavenumber decreases or the wave energy increases more significantly and decreases if the total wavenumber increases or the wave energy decreases more significantly.The matched roles of the energy from the basic flow and the divergence of the group velocity contribute to the slightly oscillating wave energy,which causes a slightly oscillating amplitude as well as the slightly oscillating total wavenumber.

关 键 词：Rossby waves quasigeostrophic barotropic model energy dispersion wave energy AMPLITUDE 

分 类 号：P412[天文地球—大气科学及气象学]