Global mapping of diapycnal mixing rates in the deep ocean for accurate modeling of the oceanic general circulation

本文利用三维数值模式，研究了北太平洋深水潮汐混合的内波能量分布。冬季，北太平洋中西部(30ﾟN-45ﾟN)的中纬度风暴激发出高能的近惯性波。因此，激发波向南传播到10ﾟN-15ﾟN，在那里频率变为局地惯性频率的两倍，从而使大量的波能通过参数亚谐不稳定机制向下扩散到耗散尺度。相比之下，低垂直波数的双惯性频率内波在以前的微尺度测量的时间和位置上很弱，因此观测到的-0.1 cm^2s^&1；-1的日扩散系数可能不具有代表性。

By using three-dimensional numerical models, the distribution of internal wave energy for diapycnalmixing in the deep waters of the North Pacific has been examined. During winter, energetic near-inertial waves are excited in response to the midlatitude storms in the western-central North Pacific (30ﾟN-45ﾟN). Thus excited waves propagate southward down to 10ﾟN-15ﾟN where the frequencies become double the local inertial frequencies so that large amount of wave energy cascades down to dissipation scales via Parametric Subharmonic Instability mechanism. The low-vertical-wavenumber double-inertial frequency internal waves are, in contrast, very weak at the times and locations of the previous microscale measurements so that the observed diapycnal diffusivity of-0.1 cm^2s^<-1> might not be representative.