عرض بسيط للتسجيلة

المؤلفAl-Ansari, Ebrahim M.A.S.
المؤلفRowe, G.
المؤلفAbdel-Moati, M.A.R.
المؤلفYigiterhan, O.
المؤلفAl-Maslamani, I.
المؤلفAl-Yafei, M.A.
المؤلفAl-Shaikh, I.
المؤلفUpstill-Goddard, R.
تاريخ الإتاحة2017-05-22T08:40:47Z
تاريخ النشر2015-06-20
اسم المنشورEstuarine, Coastal and Shelf Scienceen_US
المعرّفhttp://dx.doi.org/10.1016/j.ecss.2015.03.022
الاقتباسAl-Ansari, Ebrahim M.A.S. , Rowe, G... et al. "Hypoxia in the central Arabian Gulf Exclusive Economic Zone (EEZ) of Qatar during summer season",Estuarine, Coastal and Shelf Science, Vol. 159, 2015
الرقم المعياري الدولي للكتاب02727714
معرّف المصادر الموحدhttp://www.sciencedirect.com/science/article/pii/S0272771415001006
معرّف المصادر الموحدhttp://hdl.handle.net/10576/5519
الملخصAbstract One of the most fascinating and unexpected discoveries during the Qatar University Marine Expeditions to the marine Exclusive Economic Zone (EEZ) of Qatar in 2000–2001, was the detection of a hypoxic water layer in the central region of the Arabian Gulf in waters deeper than 50 m. Hypoxia was defined as the region where the concentration of dissolved oxygen was less than 2 mg L−1. This article presents the discovery of hypoxia in the Arabian Gulf, based on samples collected (mainly during evening or night time) from vertical profiles along transects of the EEZ of Qatar and analyzed for physico-chemical properties, nutrients and chlorophyll-a. Hypoxia occurred in the summer months caused by an interaction between physical stratification of the water column that prevents oxygen replenishment, and biological respiration that consumes oxygen. Strong south-westerly winds (the SW monsoon) from June to September drive the relatively low-salinity nutrient-rich surface water from the Arabian Sea/Arabian Gulf (Sea of Oman) through the Strait of Hormuz into the central-Arabian Gulf, and this surface current penetration fertilizes the deep central-Arabian Gulf during the summer period. A strong seasonal pycnocline is formed between deeper waters at an ambient temperature of 20.9 °C and surface waters at 31.9 °C. This prevents the mixing of supersaturated O2 (>100–130%) water from the upper layer that would otherwise raise concentrations of dissolved oxygen below the thermocline, thus resulting in deep water hypoxia, i.e. dissolved oxygen levels of less than 0.86 ml L−1 at 17.3% saturation. These are the lowest values ever recorded for the Arabian Gulf.The calculated area of hypoxia is around 7220 square kilometers, and occurs in a layer about ≥15 m thick above the sea floor which extends toward the deep part of the Qatar Exclusive Economic Zone (EEZ). The biological consequences of this hypoxia on the sea floor are yet to be investigated.
اللغةen
الناشرElsevier
الموضوعhypoxia
الموضوعnutrients
الموضوعapparent oxygen utilization
الموضوعredfield ratio
الموضوعhydrography of Arabian Gulf
الموضوعEEZ of Qatar
العنوانHypoxia in the central Arabian Gulf Exclusive Economic Zone (EEZ) of Qatar during summer season
النوعArticle
الصفحات60-68
رقم المجلد159


الملفات في هذه التسجيلة

الملفاتالحجمالصيغةالعرض

لا توجد ملفات لها صلة بهذه التسجيلة.

هذه التسجيلة تظهر في المجموعات التالية

عرض بسيط للتسجيلة