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هفتمین همایش بین المللی سواحل، بنادر و سازه های دریایی
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  • seasonal sea level changes and thermal expansion in the persian gulf

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    • تاریخ ارائه: 1385/01/01
    • تاریخ انتشار در تی پی بین: 1385/01/01
    • تعداد بازدید: 775
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a climate signal in sea-level can be expected for two reasons: firstly, the ocean volume changes whenever a change in the heat content of ocean water takes place, and secondly, ocean mass changes due to a change in the mass flow between the ocean and other reservoirs of the hydrological cycle. monitoring ocean temperature is not a simple matter, however. while sea surface temperatures are relatively well measured, deep ocean thermal structure remains unconstrained. even the thermal structure of the mixed layer is not well monitored, although some efforts are being made toward that end. in an attempt to understand the causes of seasonal cycle of sea level in the persian gulf, we relate sea level data from eleven stations to atmospheric pressure and thermosteric level. the sea level varies slightly from one station to another and are significantly are correlated to each other the thermosteric sea level variability produced by the temparature in the persian gulf is estimated from temperature profile at each grid point. the contour maps of thermosteric level show that height due to the thermal expansion is high in summer and autumn, and low during winter and spring. the monthly mean thermostric height ranges from +2,2 cm in july to -2,1 cm in february. the dominant influence on the seasonal cycle of sea level is associated with atmospheric pressure but the thermosteric sea level adjustment in the multivariate analysis increases the proportion of the variance explained to 78,1-90,7 %. seasonal cycle of the flow exchange through the strait of hormuz is related to the seasonal sea level changes.

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