A multiple time scale perturbation method is used to discuss the Lagrangian residual current and residual transport on the basis of a weakly nonlinear dynamic model of shallow seas. The governing equations for the lon...A multiple time scale perturbation method is used to discuss the Lagrangian residual current and residual transport on the basis of a weakly nonlinear dynamic model of shallow seas. The governing equations for the long-term variation of zero order " apparent concentration " (which is a linear combination of salinity , temperature of seawater and the concentration of any tracer which is conservative and passive ) and its mean value over tidal cycles are obtained for the system with single tidal constituent . and for the one with multi-constituents, winds and thermohaline. The equations for the two cases are in the same form and show this long-term variation resulted from the cumulative effect of residual convection and turbulent diffusion .The multiple time scale variation of current is caused by tides, winds, and the thermohaline and the nonlinear effects of the system. The derived set of governing field equations of the Lagrangian current for this multiple time scale system is also in the same form展开更多
Five sets of model sensitivity experiments are conducted to investigate the influence of tropical cyclone （TC） genesis location and atmospheric circulation on interannual variability of TC intensity in the western N...Five sets of model sensitivity experiments are conducted to investigate the influence of tropical cyclone （TC） genesis location and atmospheric circulation on interannual variability of TC intensity in the western North Pacific （WNP）. In each experiment, bogus TCs are placed at different initial locations, and simulations are conducted with identical initial and boundary conditions. In the first three experiments, the specified atmospheric and SST conditions represent the mean conditions of E1 Nifio, La Nifia, and neutral years. The other two experiments are conducted with the specified atmospheric conditions of E1 Nifio and La Nifia years but with SSTs exchanged. The model results suggest that TCs generated in the southeastern WNP incurred more favorable environmental conditions for development than TCs generated elsewhere. The different TC intensities between E1 Nifio and La Nifia years are caused by difference in TC genesis location and low-level vorticity （VOR）. VOR plays a significant role in the intensities of TCs with the same genesis locations between E1 Nifio and La Nina years.展开更多
In a tidally dominant coastal ocean, bay, or estuary it has been proposed that the problem of circulation should be described by the Lagrangian mean velocity, not the Eulerian mean velocity used traditionally. The fir...In a tidally dominant coastal ocean, bay, or estuary it has been proposed that the problem of circulation should be described by the Lagrangian mean velocity, not the Eulerian mean velocity used traditionally. The first-order Lagrangian mean velocity of a weakly nonlinear coastal ocean system, or the mass-transport velocity has been used to body the velocity field of steady circulation as the lowest order coastal circulation, and a set of field equations for it has been derived. It should be pointed out that in the set of field equations just mentioned the eddy viscosity has been supposed to be a展开更多
文摘A multiple time scale perturbation method is used to discuss the Lagrangian residual current and residual transport on the basis of a weakly nonlinear dynamic model of shallow seas. The governing equations for the long-term variation of zero order " apparent concentration " (which is a linear combination of salinity , temperature of seawater and the concentration of any tracer which is conservative and passive ) and its mean value over tidal cycles are obtained for the system with single tidal constituent . and for the one with multi-constituents, winds and thermohaline. The equations for the two cases are in the same form and show this long-term variation resulted from the cumulative effect of residual convection and turbulent diffusion .The multiple time scale variation of current is caused by tides, winds, and the thermohaline and the nonlinear effects of the system. The derived set of governing field equations of the Lagrangian current for this multiple time scale system is also in the same form
基金support from the National Natural Science Foundation of China (NSFC: Grant No. 41175090 and 41175086)support from the NSFC (Grant No. 40975040)+1 种基金the Fundamental Research Funds for the Central Universities (Grant No. 1116020701)"A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions"
文摘Five sets of model sensitivity experiments are conducted to investigate the influence of tropical cyclone （TC） genesis location and atmospheric circulation on interannual variability of TC intensity in the western North Pacific （WNP）. In each experiment, bogus TCs are placed at different initial locations, and simulations are conducted with identical initial and boundary conditions. In the first three experiments, the specified atmospheric and SST conditions represent the mean conditions of E1 Nifio, La Nifia, and neutral years. The other two experiments are conducted with the specified atmospheric conditions of E1 Nifio and La Nifia years but with SSTs exchanged. The model results suggest that TCs generated in the southeastern WNP incurred more favorable environmental conditions for development than TCs generated elsewhere. The different TC intensities between E1 Nifio and La Nifia years are caused by difference in TC genesis location and low-level vorticity （VOR）. VOR plays a significant role in the intensities of TCs with the same genesis locations between E1 Nifio and La Nina years.
文摘In a tidally dominant coastal ocean, bay, or estuary it has been proposed that the problem of circulation should be described by the Lagrangian mean velocity, not the Eulerian mean velocity used traditionally. The first-order Lagrangian mean velocity of a weakly nonlinear coastal ocean system, or the mass-transport velocity has been used to body the velocity field of steady circulation as the lowest order coastal circulation, and a set of field equations for it has been derived. It should be pointed out that in the set of field equations just mentioned the eddy viscosity has been supposed to be a
