中尺度海陆风环流的动力学特征

本文利用Boussincsq流体的二维运动方程,讨论了类似于海陆风的中尺度环流的动力学特征。中尺度海陆风环流的发展包含适应和演变两种过程。非定常环流经过适应过程的调整,很快达到准定常状态,并且在大气斜压性与耗散相平衡的水平上缓慢演变。在具有弱耗散的非线性系统内,波-波相互作用可以激发中尺度环流的共振发展。耗散通过损失共振波组的总能量削弱共振波的发展。

DYNAMICAL PROPERTIES OF MESOSCALE CIRCULATON LIKE LAND-SEA BREEZE

In this paper a set of two-D Boussinesq fluid equations are used to study the mesoscal circulation like land sea breeze. The study suggestes that the development of the mesoscale land sea breeze contains two kinds of processes, i.e. adjustment and evolution. When the land or sea surface temperature is changed, the land sea breeze can quickly reach a new quasisteady state related to the new distribution of the surface temperature. The study also shows that in the nonlinear system with friction, wave-wave reactions may lead to a resonant development of the mesoseale circulation while the amplitudes of the resonant waves are reduced with time because of friction.