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Register a new userSpatial -Temporal variations of the carbon dioxide system in the surface seawater of Tartous city
دراسة التغيرات الزمانية و المكانية لنظام ثنائي أكسيد الكربون في المياه السطحية البحرية المقابلة لمدينة طرطوس
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حسام الدين لايقة( باحث )
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تركز هذا البحث على تحديد التغيرات الزمانية و المكانية لنظام ثنائي أكسيد الكربون في المياه البحرية لمدينة طرطوس في فصلي ربيع و صيف 2015، و مدى تأثره ببعض العوامل الهيدرولوجية للمياه (درجة حرارة و ملوحة) و أثر كل ذلك في قيم pH المياه البحرية . بينت النتائج انخفاض قيم الضغط الجزئي لغاز ثنائي أكسيد الكربون في المياه البحرية (PCO2sea) في فصل الصيف مقارنة مع فصل الربيع، الأمر الذي انعكس على قيم التدفق (FCO2)، حيث انطلق غاز CO2 من المياه باتجاه الهواء في الصيف و العكس في فصل الربيع (0.0632mmol/m²/day و-0.0715mmol/m²/day على التوالي). ساهم انخفاض درجة حرارة وملوحة المياه في فصل الربيع(C 22.707-22.727 و 37.605-37.765 على التوالي)، بالإضافة إلى زيادة النشاط البيولوجي في زيادة امتصاص CO2 من المياه مما يؤدي إلى تناقص PCO2sea(409.0- 429.5µatm) مترافقة مع انخفاض تراكيز كل من إجمالي الكربون اللاعضوي (2229.5-2242.5µmol/kg) و القلوية (2588.873-2590.9µmol/kg)، و بالنتيجة تصبح المياه البحرية مستودع لتخزين غاز ثنائي أكسيد الكربون الجوي. أما في فصل الصيف فإن ارتفاع درجة حرارة و ملوحة المياه (C28.85-29.60 و 38.60 38.15- على التوالي) و تناقص النشاط البيولوجي كل ذلك ساهم في انخفاض قيم CO2 المنحل و في ارتفاعPCO2sea(437.5 - 453.5µatm) مترافقة مع زيادة تراكيز كل من إجمالي الكربون اللاعضوي (2267.9 – 2296.0µmol/kg) و القلوية (2739.6 –2741.2µmol/kg)، و بهذا الشكل تكون المياه البحرية مصدر لغاز ثنائي أكسيد الكربون إلى الغلاف الجوي.
This research focuses on identifying spatial and temporal variationsof the carbon dioxide system in the surface seawater of Tartouscityduring the period betweenspring and summer 2015.In Addition to the extent influenced by some hydrological properties of water (temperature and salinity) and the impact all of this on the pH of marine water values. The results showed low partial pressure of the carbon dioxide in seawaters (PCO2 sea) in the summercompared with spring, which is reflected on the air-sea flux values (FCO2), where CO2 released from surface seawater to the air in summer and incontradiction of that in the spring (0.0632mmol /m²/ day and -0.0715 mmol /m²/day, respectively). In spring, low temperature and salinity of the water (22.707-22.727C and 37.605-37.765‰ respectively), in addition to increased biological activity contributed in increasing the absorption of CO2 from the water.These leading to a decrease PCO2 sea (409.0- 429.5μatm) associated with low concentrations of all of the total inorganic carbon (2229.5- 2242.5μmol/kg) and total alkalinity (2588.873-2590.9μmol/kg). and as a result the surface sea waters become a reservoir of dioxide carbon atmospheric. In the summer, the rise in temperature and salinity of surface seawater (28.85- 29.60Cand38.15-38.60‰, respectively) and reduced biological activity all contributed to the decrease dissolved CO2 values and increase of PCO2 sea(437.5 - 453.5μatm) associated with increasing concentrations of each of the total inorganic carbon (2267.9 - 2296.0μmol/kg) and total alkalinity (2739.6 -2741.2μmol/kg).In this way the surface sea water is source of carbon dioxide to the atmosphere.
References used
AÏT-AMEUR, N. AND GOYET, C. Distribution and transport of natural and anthropogenic CO2 in the Gulf of Càdiz. Deep-sea Research II 2006.VOL. 53, 1329-1343
ALVAREZ, M., PEREZ, F. F., SHOOSMITH, D. R, BRYDEN, H. L. Unaccounted role of Mediterranean water in the drawdown of anthropogenic carbon. Journal Geophysical Research. 2005. VOL. 110, 1-18
BAES, C.F. Ocean chemistry and biology, in Carbon Dioxide Review edited by W.C. Clark, Clarendon Press, Oxford, 1982. 187-211
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