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

DOI: 10.4236/ojms.2017.71013, PP. 169-190

Keywords: Thermohaline Intrusion, Double Diffusive Convection Salt Fingering, Persian Gulf Outflow

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Abstract:

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.

References

[1]  Reynolds, R.M. (1993) Physical Oceanography of the Gulf, Strait of Hormuz, and the Gulf of Oman—Results from the Mt Mitchell Expedition. Marine Pollution Bulletin, 27, 35-59.
https://www.researchgate.net/publication/223884087
https://doi.org/10.1016/0025-326X(93)90007-7
[2]  Ezam, M., Bidokhti, A.A. and Javid, A.H. (2010) Numerical Simulation of Spreading of the Persian Gulf Outflow in the Oman Sea. Ocean Science, 6, 887-900.
http://www.ocean-sci.net/6/887/2010/
https://doi.org/10.5194/os-6-887-2010
[3]  Pous, S.P., Carton, X. and Lazure, P. (2004) Hydrology and Circulation in the Strait of Hormuz and the Gulf of Oman—Results from the GOGP99 Experiment: 1. Strait of Hormuz. Journal of Geophysical Research, 109, 42-56.
http://onlinelibrary.wiley.com/doi/10.1029/2003JC002146/full
https://doi.org/10.1029/2003jc002145
[4]  Pous, S.P., Carton, X. and Lazure, P. (2004) Hydrology and Circulation in the Strait of Hormuz and the Gulf of Oman—Results from the GOGP99 Experiment: 2. Gulf of Oman. Journal of Geophysical Research, 109, 57-58.
https://www.researchgate.net/publication/233751515
https://doi.org/10.1029/2003jc002146
[5]  Sultan S.A.R. and Elghribi, N.M. (1996) Temperature Inversion in the Arabian Gulf and the Gulf of Oman. Continental Shelf Research, 16, 1521-1544.
https://doi.org/10.1016/0278-4343(95)00086-0
[6]  Ruddick, B. and Richards, K. (2003) Oceanic Thermohaline Intrusions: Observations. Progress in Oceanography, 56, 499-527.
http://adsabs.harvard.edu/abs/2003PrOce..56..499R
https://doi.org/10.1016/S0079-6611(03)00028-4
[7]  May, B. and Kelly, D. (2001) Growth and Steady State Stages of Thermohaline Intrusions in the Arctic Ocean. Journal of Geophysical Research, 106, 16783-16794.
http://onlinelibrary.wiley.com/doi/10.1029/2000JC000605/full
https://doi.org/10.1029/2000JC000605
[8]  Bidokhti, A.A. and Griffiths, R.W. (2001) The Role of Internal Waves in the Layering of out Flows from Semi-Enclosed Seas. Proceeding of 14th Australasian Fluid Mechanics Conference, Adelaide, 9-14 December 2001, 885-888.
[9]  Radko, T. (2013) Double-Diffusive Convection. Cambridge University Press, Cambridge, 344 p.
https://doi.org/10.1017/CBO9781139034173
[10]  Bidokhti, A.A. (2005) Shear Induced Splitting of a Plume Outflow in A Stratified Enclosed Basin. Indian Journal of Marine Sciences, 34, 192-211.
http://nopr.niscair.res.in/bitstream/123456789/1556/1/IJMS%2034(2)%20192-211.pdf
[11]  Ruddick, B.R. and Turner, J.S. (1979) The Vertical Length Scale of Double-Diffusive Intrusions. Deep-Sea Research Part A, 26, 903-913.
http://adsabs.harvard.edu/abs/1979DSRA...26..903R
https://doi.org/10.1016/0198-0149(79)90104-3
[12]  Shcherbina, A.Y., Gregg, M.C., Alford, M.H. and Harcourt, R.R. (2009) Characterizing Thermohaline Intrusions in the North Pacific Subtropical Frontal Zone. Journal of Physical Oceanography, 39, 2735-2756.
https://doi.org/10.1175/2009JPO4190.1
[13]  Kuzmina, N., Rudels, B., Zhurbas, V. and Stipa, T. (2011) On the Structure and Dynamical Features of Intrusive Layering in the Eurasian Basin in the Arctic Ocean, Journal of Geophysical Research, 116, C00D11.
https://doi.org/10.1029/2010JC006920
http://onlinelibrary.wiley.com/doi/10.1029/2010JC006920/full
[14]  Djoumna, G. and Holland, D. (2014) Spatial and Temporal Patterns of Fine Structure, and Vertical Mixing Processes in Greenland Fjords. Part I: Sermilik Ice Fjord, East Greenland. Journal of Geophysical Research, 10, 1029.
http://efdl.cims.nyu.edu/publications/refereed/jgr_mixing_part_2_2015.pdf
[15]  Azizpour, J., Chegini, V., Khosravi, M. and Einali, A. (2014) Study of the Physical Oceanographic Properties of the Persian Gulf, Strait of Hormuz and Gulf of Oman Based on PG-GOOS CTD Measurements. Journal of the Persian Gulf, 5, 37-48.
http://jpg.inio.ac.ir/article-1-324-en.html
[16]  Griffith, R.W. and Bidokhti, A.A. (2008) Interleaving Intrusions Produced by Internal Waves: A Laboratory Experiment. Journal of Fluid Mechanics, 602, 219-239.
https://doi.org/10.1017/s0022112008000839
[17]  Bower, A.S., Hunt, H.D. and Price, J.F. (2000) Character and Dynamics of the Red Sea and Persian Gulf Outflow. Journal of Geophysical Research, 105, 6387-6414.
http://onlinelibrary.wiley.com/doi/10.1029/1999JC900297/full
https://doi.org/10.1029/1999JC900297
[18]  Turner, J.S. (1973) Buoyancy Effects in Fluids. Cambridge University Press, Cambridge, 367 p.
https://doi.org/10.1017/CBO9780511608827
[19]  Ruddick, B.R. (1983) A Practical Indicator of the Stability of the Water Column to Double-Diffusive Activity. Deep-Sea Research, 30, 1105-1107.
https://doi.org/10.1016/0198-0149(83)90063-8
[20]  Senjyu, T., Ishimaru, T., Matsuyama, M. and Koike, Y. (1998) High Salinity Lens from the Strait of Hormuz. In: Otsuki, A., Abdulraheem, M.Y. and Reynolds, R.M., Eds., Offshore Environments of the ROPME after the War Related Oil-Spill, TERRAPUB, Tokyo, 35-48.
[21]  Wieczorek, G., Hagen, E. and Umlauf, L. (2008) Eastern Gotland Basin Case Study of Thermal Variability in the Wake of Deep Water Intrusions. Journal of Marine Systems, 74, S65-S79.
https://doi.org/10.1016/j.jmarsys.2008.07.008

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