南海北部冬季和夏季逆风流机制初探──Ⅰ．季风逆风流诊断方程及其诊断判据

A PRIMARY STUDY OF WINTER AND SUMMER UPWIND FLOW MECHANISM IN THE NORTHERN PART OF SOUTH CHINA SEA──Ⅰ. MONSOON UPWIND FLOW DIAGNOSTIC EQUATIONS AND CRITERIONS

通过简化原始运动方程，得到南海北部季风逆风流诊断方程，对季风逆风流诊断方程进行必要的数学处理后，导出南海北部产生季风逆风流的必要条件和诊断判据；指出南海北部季风逆风流由风生直接逆风流与风生间接逆风流叠加而成，风生间接过风流由风生间接正压地转逆风流与风生间接斜压地转逆风流组成，还导出风致巴士海峡以东的黑潮水影响季风逆风流的判据，在合适的风向及适当的摩擦系数情况下，黑潮水可成为间接逆风流的热源。并首次提出风生直接逆风流、风生间接逆风流、正压逆风流、斜压逆风流、风生间接正压地转逆风流和风生间接斜压地转逆风流概念。

By simplifying primary motion equations, the diagnostic equations of monsoon upwind flow (DEMUF) in the northern part of South China Sea (SCS) are proposed. The necessary conditions and diagnostic criterions of monsoon upwind flow (MUF) are derived, after some necesary processing to the DEMUF. It is pointed out that MUF consists of direct upwind flow (DUF) and indirect upwind flow (IUF) caused by wind stress in SCS. IUF that is caused by wind stress consists of indirect barotopical geotrophic upwind flow (IBTGUF) and indirect baroclinic geotrophic upwind flow (IBCGUF) induced by wind stress. Driven under wind stress, the criterion of Kuroshio water in the east of Bashi Strait that effects MUF is derived also. Under the conditions of proper wind direction and bottom friction coefficient, the Kuroshio water in the east of Bashi Strait may become a heat source of IUF. The concepts of DUF, IUF, IBTGUF and IBCGUF that are caused by wind stress are proposed for the first time.