fa ردیابی توده های آب خلیج عدن با استفاده از ردیاب غیرفعال اقیانوس شناسی فیزیکی (فیزیک دریا) Physical Oceanography پژوهشي Research/ Original/ Regular Article <div dir="ltr" style="text-align: justify;">DOR: 98.1000/1562-1057.1397.9.49.0.35.1585.1604</div> <div style="text-align: justify;"><br> <span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در مطالعه حاضر توده&shy;های آب خلیج عدن با استفاده از یک ردیاب غیرفعال متمرکز با مدل</span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&nbsp;MITgcm </span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شناسایی شدند. حوزه مدل&shy;سازی در محدوده </span></span></span></span>^{<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&deg;</span></span></span></span>&nbsp;}<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">N</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">30-</span></span></span></span>^{<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&deg;</span></span></span></span>&nbsp;}<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">N</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">5/0 و </span></span></span></span>^{<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&deg;</span></span></span></span>&nbsp;}<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">E</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">77-</span></span></span></span>^{<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&deg;</span></span></span></span>&nbsp;}<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">E</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">44</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بود. داده&shy;های اولیه (دما، شوری، باد، شار گرمای خالص، تبخیر و بارش) به مدل معرفی گردیدند و مدل&shy;سـازی برای 20 سـال انجام شد. مقـایسه نتایج مدل بـا داده&shy;های اندازه&shy;گیری شده، توافق خوبی را نشان دادند. نتایج حاصل از مدل&shy;سازی، نشان&shy;دهنده وجود سه توده آب تا عمق 900 متری (عمق مدل&shy;سازی شده) در خلیج عدن بود. این توده&shy;ها شامل توده آب سطحی خلیج عدن تا عمق 200-100 متری با بیشینه شوری</span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&nbsp;psu </span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">37</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و چگالی </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">kg/m³</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;1023-1024، توده آب لایه&shy;های میانی خلیج عدن در عمق&shy;های 600-100 متری با شوری </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">psu</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;36-35</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و چگالی </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">kg/m³</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;1026-1024</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و توده آب عمق در عمق&shy;های 900-400 متری و پایین&shy;تر با شوری </span></span></span></span>&nbsp;<span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">psu</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;9/36-9/35</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و چگالی </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">kg/m³</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;5/1027-1026 بودند. در گرادیان چگالی افقی ناشی از تغییرات شوری بین آب شور عمق و آب کم شور خلیج عدن ناپایداری باروکلینیکی مشاهده گردید. نتایج حاصل از رهاسازی ردیاب متمرکز غیرفعال با غلظت 100% در خلیج عدن در سطح، عمق 200 متر و عمق 400 متر نیز وجود سه توده آب را تأیید نمود. پهنای بحرانی جریان آب عمیق برای جدایی از مرز ساحلی با استفاده از محاسبه شعاع تغییر شکل راسبی برای زمستان </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">&nbsp;km</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">25/30</span></span></span></span>&nbsp;<span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و در تابستان </span></span></span></span><span style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:times new roman,serif;"><span style="font-size:9.0pt;">km</span></span></span></span><span dir="RTL" style="position:relative;top:-2.0pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">&nbsp;4/50 محاسبه شد.</span></span></span></span></div> <div dir="ltr" style="text-align: justify;"></div> <div style="text-align: justify;">In the present study, the Aden Gulf water masses have been detected using a concentration passive tracer with the MITgcm model. The modeling domain is in the range 0.5&deg;N-30&deg;N, 44&deg;E-77&deg;E. The initial data (Temperature, salinity, wind, net heat flux, evaporation and precipitation) is appropriate to the model and modeling has been run for 20 years. Comparing the results of the model with the measured data shows a good agreement. The results of modeling indicate that there are three water masses up to 900 meters deep (modeled depth) in the Gulf of Aden. The Aden Gulf surface water mass is to the depth of 100-200 meters with a maximum salinity of 37 psu and density of 1023-1024 kg/m³. The water mass of the Aden Gulf&#39;s intermediate layers with the salinity of 35.9 to 36.9 psu and density of 1024-1026 kg/m³ at a depth of 100-600 m and deep water mass with salinity of 35.9-36.9 psu and density 1026-1027.5 kg/m³ located at depths of 400-900 meters and below. The horizontal density gradient due to salinity changes between the deep salty water and the low salty water of the Gulf of Aden leads to the creation of baroclinic instability. The calculation of the density ratio represents the establishment of a thermohaline convective regime between the Gulf of Aden water masses. The results of the release of passive tracer with a concentration of 100% in the Gulf of Aden from surface to depth also confirm the existence of three water masses. The surface plume spread to the length of the 46&deg;E after 270 days under the influence surface currents of the Gulf of Aden. The output of plume at depths of 200 and 400 meters in two northern and southern channels extended to 47&deg;E after 270 days in the Gulf of Aden. The critical width of the deep water flow for separation from the coastal boundary was calculated, by calculating the radius of Rossby deformation, as 30.25 km in the winter and 50.4 km in the summer.</div> ردیاب غیرفعال, MITgcm, توده آب سطحی, توده آب میانی, توده آب عمق, ناپایداری باروکلینیکی, درون آمیختگی, خلیج عدن. Passive tracer, MITgcm, Surface water mass, Intermediate, Deep water, Baroclinic instability, Entrainment, Gulf of Aden 49 60 http://joc.inio.ac.ir/browse.php?a_code=A-10-1317-3&slc_lang=fa&sid=1 Rahele Shafiee Sarvestani راحله شفیعی سروستانی rahele_shafiee@yahoo.com 10031947532846008675 10031947532846008675 No Khorramshahr Marine Science and Technology University دانشگاه علوم و فنون دریایی خرمشهر Masoud Sadrinasab مسعود صدری نسب masoud.sadri@gmail.com 10031947532846008676 10031947532846008676 Yes Tehran University دانشگاه تهران Mohammad Akbarinasab محمد اکبری نسب akbarinasbm@yahoo.com 10031947532846008677 10031947532846008677 No University of Mazandaran . 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