Oceanic contribution to the poleward heat flux in the climate system includes two components: the sensible heat flux and the latent heat flux. Although the latent heat flux has been classified as atmospheric heat flux...Oceanic contribution to the poleward heat flux in the climate system includes two components: the sensible heat flux and the latent heat flux. Although the latent heat flux has been classified as atmospheric heat flux exclusively, it is argued that oceanic control over this component of poleward heat flux should play a critically important role. The so-called swamp ocean model practice is analyzed in detail, and the critical role of oceanic circulation in the establishment of the meridional moisture transport is emphasized.展开更多
Using monthly gridded ocean pathfinder Sea Surface Temperature （SST） data with a spatial resolution of 4kin from AVHRR, variations of SST over the Kuroshio region northeast of Taiwan Is. during the past two decades ...Using monthly gridded ocean pathfinder Sea Surface Temperature （SST） data with a spatial resolution of 4kin from AVHRR, variations of SST over the Kuroshio region northeast of Taiwan Is. during the past two decades （1985-2003） are studied. Some interesting findings are as follows. （1） The climatological SST field shows an expected pattern with southwest-northeast orientated isotherms, and this pattern is mainly dominated by solar irradiance and regional circulation. However, the interannual variation of this pattern is very notable, in particular along Kuroshio path. The most dynamic region is located in the east coast of Taiwan, where cold upwelling is very energetic. （2） Seasonal variation of SST over this region is mainly controlled by see-saw variation of solar irradiance between two hemispheres, but the strong interannual fluctuation of SST is found to be locked to boreal winter （January, February, and last December）, and the energetic region is identified along Kuroshio path. This phenomenon seems to closely connect with El Nifio＇s phase locking characteristics. （3） SST anomalies over Kuroshio region have a positive correlation with El Nifio-Southem Oscillation （ENSO）, which is dramatic due to the weak （strong） North Equatorial Current （NEC） during El Nifio （La Nifia） events, and the weak （strong） NEC is supposed to induce a same polarity of SST variation along the Kuroshio path. How the interannual variation and seasonal variation interact each other and what is the mechanism between ENSO and the thermal and thermodynamic processes over this region deserve our further analyses.展开更多
In an atrocious ocean environment,the lateral propulsion hole could potentially be partly out of water and capture an air cavity.Bubbles would form when the captured air cavity escapes underwater and they may affect t...In an atrocious ocean environment,the lateral propulsion hole could potentially be partly out of water and capture an air cavity.Bubbles would form when the captured air cavity escapes underwater and they may affect the performance of the sonar.The common commercial computational fluid dynamics software CFX was adopted to calculate the ambient flow field around the lateral propulsion hole generated by a moving vessel.The oscillation of the spherical bubble was based on the Rayleigh-Plesset equation and its migration was modeled using the momentum equation.The radiated noise of the oscillating bubble was also studied.The aim is that the results from this paper would provide some insight into corresponding fluid and acoustic study.展开更多
文摘Oceanic contribution to the poleward heat flux in the climate system includes two components: the sensible heat flux and the latent heat flux. Although the latent heat flux has been classified as atmospheric heat flux exclusively, it is argued that oceanic control over this component of poleward heat flux should play a critically important role. The so-called swamp ocean model practice is analyzed in detail, and the critical role of oceanic circulation in the establishment of the meridional moisture transport is emphasized.
基金Cosponsored by the NSFC (No. 40545018) and the National Basic Research Program of China (No. 2005CB422308).
文摘Using monthly gridded ocean pathfinder Sea Surface Temperature （SST） data with a spatial resolution of 4kin from AVHRR, variations of SST over the Kuroshio region northeast of Taiwan Is. during the past two decades （1985-2003） are studied. Some interesting findings are as follows. （1） The climatological SST field shows an expected pattern with southwest-northeast orientated isotherms, and this pattern is mainly dominated by solar irradiance and regional circulation. However, the interannual variation of this pattern is very notable, in particular along Kuroshio path. The most dynamic region is located in the east coast of Taiwan, where cold upwelling is very energetic. （2） Seasonal variation of SST over this region is mainly controlled by see-saw variation of solar irradiance between two hemispheres, but the strong interannual fluctuation of SST is found to be locked to boreal winter （January, February, and last December）, and the energetic region is identified along Kuroshio path. This phenomenon seems to closely connect with El Nifio＇s phase locking characteristics. （3） SST anomalies over Kuroshio region have a positive correlation with El Nifio-Southem Oscillation （ENSO）, which is dramatic due to the weak （strong） North Equatorial Current （NEC） during El Nifio （La Nifia） events, and the weak （strong） NEC is supposed to induce a same polarity of SST variation along the Kuroshio path. How the interannual variation and seasonal variation interact each other and what is the mechanism between ENSO and the thermal and thermodynamic processes over this region deserve our further analyses.
基金Supported by the National Science Foundation of China （11002038）Key Project of National Natural Science Funds （50939002）+2 种基金National Defense Foundation Scientific Project （B2420110011）the National Science Foundation for Young Scientists of China （51009035）Natural Science Funds of Heilongjiang Province （E201047,A200901）
文摘In an atrocious ocean environment,the lateral propulsion hole could potentially be partly out of water and capture an air cavity.Bubbles would form when the captured air cavity escapes underwater and they may affect the performance of the sonar.The common commercial computational fluid dynamics software CFX was adopted to calculate the ambient flow field around the lateral propulsion hole generated by a moving vessel.The oscillation of the spherical bubble was based on the Rayleigh-Plesset equation and its migration was modeled using the momentum equation.The radiated noise of the oscillating bubble was also studied.The aim is that the results from this paper would provide some insight into corresponding fluid and acoustic study.
