The dynamics of eastward shifting cyclonic vortices are investigated in terms of a barotropic primitive equation model, and six experiments are performed. Both the interaction of a cyclonic vortex with vorticity lumps...The dynamics of eastward shifting cyclonic vortices are investigated in terms of a barotropic primitive equation model, and six experiments are performed. Both the interaction of a cyclonic vortex with vorticity lumps and the interaction of the vortex with the shearing basic flow may induce the strengthening of the vortex in a short period, however, the vortex intensity still shows a general decreasing tendency over the whole integration time period. The interaction among the shearing basic flow, cyclonic vortex, and multiple vorticity lumps can change the tendency. The merging of the cyclonic vortex with vorticity lumps in the shearing basic flow of positive vorticity is directly responsible for the maintenance and development of the cyclonic vortex.展开更多
The period of strategic opportunities for China’s development, in terms of international environment, means the environment, opportunities, conditions and the time limits provided by the period of strategic opportuni...The period of strategic opportunities for China’s development, in terms of international environment, means the environment, opportunities, conditions and the time limits provided by the period of strategic opportunities. Since the U.S. eastward shift of its strategic focus, the changing China-U.S. relations and major powers games will exert tremendous impacts on the period of strategic opportunities and lead to three new characteristics featuring a more complicated and changeable strategic posture, controllable crisis management and universal values.展开更多
基金the National Natural Science Foundation under Grant No.49775263the project of the Tibetan Plateau Experiment(TIPEX)of Atmospheric Science and the 973 Project onheavy rain in China.
文摘The dynamics of eastward shifting cyclonic vortices are investigated in terms of a barotropic primitive equation model, and six experiments are performed. Both the interaction of a cyclonic vortex with vorticity lumps and the interaction of the vortex with the shearing basic flow may induce the strengthening of the vortex in a short period, however, the vortex intensity still shows a general decreasing tendency over the whole integration time period. The interaction among the shearing basic flow, cyclonic vortex, and multiple vorticity lumps can change the tendency. The merging of the cyclonic vortex with vorticity lumps in the shearing basic flow of positive vorticity is directly responsible for the maintenance and development of the cyclonic vortex.
文摘The period of strategic opportunities for China’s development, in terms of international environment, means the environment, opportunities, conditions and the time limits provided by the period of strategic opportunities. Since the U.S. eastward shift of its strategic focus, the changing China-U.S. relations and major powers games will exert tremendous impacts on the period of strategic opportunities and lead to three new characteristics featuring a more complicated and changeable strategic posture, controllable crisis management and universal values.
