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| 1 | Evolution and breaking of a propagating internal wave in stratified ocean显示文摘The evolution and breaking of a propagating internal wave are directly numerically simulated using a pseudo-spectral method. The mechanism of PSI (parametric subharmonic instability) involved in the evolution is testified clearly. It dominates gradually in nonlinear resonant interactions. As a consequence,the energy cascades to a second plant wave packet which has lower frequencies and higher wavenumbers than that of the primary wave. With the growth of this wave packet,wave breaking occurs and causes strongly nonlinear regime,i.e. stratified turbulence. The strong mixing and intermittent of the turbulence can be learned from the evolution of the total energy and kurtosis of vorticity vs. time. Some statistic properties of the stratified turbulence are also analyzed,including the spectra of KE (kinetic energy) and PE (potential energy). The results show that the PE spectra display a wavenumber range scaling as 0.2 N4k-3y (N is the Brunt-Visl frequency,ky is the vertical wavenumber),which is called buoyancy sub-range. However,the KE spectra cannot satisfy the negative cubic law of vertical wavenumber,which have a much larger downtrend than that of the PE spectra,for the potential energy is transferred more efficiently toward small scales than the kinetic energy. The Cox number of diapycnal diffusivity is also calculated,and it shows a good consistency with the observations and deductions in the ocean interior,during the stage of the stratified turbulence maintaining a fairly active level. | LI Bingrui FAN Haimei TIAN Jiwei SUN Bo ZHANG Zhanhai | 2008 | Acta Oceanologica Sinica2008，27，1： | 3 |
| 2 | A new method for the estimation of oceanic mixed-layer depth using shipboard X-band radar images显示文摘Shipboard X-band radar images acquired on 24 June 2009 are used to study nonlinear internal wave characteristics in the northeastern South China Sea.The studied images show three nonlinear internal waves in a packet.A method based on the Radon Transform technique is introduced to calculate internal wave parameters such as the direction of propagation and internal wave velocity from backscatter images.Assuming that the ocean is a two-layer finite depth system,we can derive the mixed-layer depth by applying the internal wave velocity to the mixed-layer depth formula.Results show reasonably good agreement with in-situ thermistor chain and conductivity-temperature-depth data sets. | 吕海滨 何宜军 申辉 崔利民 窦长娥 | 2010 | Chinese Journal of Oceanology and Limnology2010，28，5： | 3 |
| 3 | Extraction of internal wave amplitude from nautical X-Band radar observations显示文摘One of the most important parameters for oceanic internal waves (IWs) is their amplitude. We have developed a method to retrieve the IW amplitude from nautical X-Band radar images based on the KdV equation for continuous stratified finite depth system. We have also tested the method of measuring the amplitude of IWs from X-Band radar backscatter image sequences acquired on June 2009 in the northeastern South China Sea. The method was applied in several radar images. Experiments show that the retrieval amplitudes are consistent with the in-situ observational amplitudes of IWs by using the towed thermistor chain and conductivity-temperature-depth (CTD) profile. The uncertainty of the method is also discussed. | 查国震 林明森 申辉 何宜军 吕海滨 | 2012 | Chinese Journal of Oceanology and Limnology2012，30，3： | 2 |
| 4 | 微波辐射计反演海表面温度和风场研究进展显示文摘海表面温度(SST)和海面风场是重要的海面气象水文参数,与海面的大部分物理过程关系密切。卫星遥感探测技术可以同时获得全球范围内的海表面温度和海面风场数据。其中,微波辐射计遥感海表面温度和风场具有不受云层遮挡的优势,本文就其发展过程作简要介绍。 | 朱恩泽 周俊浩 彭洋 | 2016 | 电子测试2016，27，6： | 1 |
| 5 | 地转及均匀背景流场对混合层深度SAR遥感反演的影响显示文摘以考虑了地转和均匀背景流场影响的两层流体界面内波频散关系模型为基础,得到新的利用SAR遥感图像计算混合层深度的方法。利用该方法对一幅南海北部SAR内波图像进行了实例研究,并且和时空同步的CTD资料进行了对比。结果表明,加入地转和均匀背景流场影响的模型更为合理,为更准确地反演混合层深度奠定了基础。 | 范聪慧 宋金宝 | 2007 | 海洋科学2007，31，4： | 0 |
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