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Physical Properties of Persian Gulf Outflow Thermohaline Intrusion in the Oman Sea

Open Journal of Marine Science 2017年第1期7卷 169-190页

作者： Eram Ghazi Abbasali Aliakbari Bidokhti Mojtaba Ezam Masoud Torabi Azad smaeyl hassanzadeh Department of Marine Science and Technology Science and Research Branch Islamic Azad University Tehran Iran Institute of Geophysics University of Tehran Tehran Iran Department of Marine Science and Technology Islamic Azad University Tehran North Branch Tehran Iran Institute of Physics University of Isfahan Isfahan Iran

Various CTD data obtained in the Oman Sea are analyzed to explain structural features of intrusive layering. Special attention is compensated to thermohaline intrusions observed in layers (depth ranges of 150 m to 450 m, 150 m to 350 m, 100 m to 350 m and 150 m and 400 m in the winter, spring, summer and autumn, respectively). The temperature and salinity profiles in thermohaline intrusion have sawtooth structure in all stations, while they have step structure in density field. Based on interpretations, detailed estimates of thickness are about 10 to 20 meters. The T-S diagrams show the positions of the outflow intrusion with different thicknesses and depths for all seasons in the Oman Sea. Vertical profiles of temperature and salinity show two boundaries in the upper and lower layers. They are prone to double diffusive convection. Salt fingering and diffusive convection can be seen in both the upper and lower boundaries, and salt fingering is stronger at the lower boundary. Diffusive convection also is visible from the surface to the mid-depth of the plume outflow, and the diffusive intrusion is more severe at the upper boundary than the surface and deep. The intensity of double diffusion in the bottom border is greater than the upper boundary. At the deeper parts, the stratification is completely stable. Variations of the positions of greatest salinities in different diagrams are due to changing water masses for different locations and depths and paths of intrusive flow.

关键词： Thermohaline Intrusion Double Diffusive Convection Salt Fingering Persian Gulf Outflow

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