Hydrographic data collected from Gulf of Aden since 1920 have been compiled to identify and refine the definitions of water masses in the Gulf of Aden (GA) and to describe their spatio-temporal variability. Four water masses have been identified based on their θ-S characteristics. The Red Sea Water (RSW) that flows from the Red Sea is the most prominent water in the GA; this occupies about 37% of the total volume of Gulf of Aden. The Gulf of Aden Surface Water (～3%) forms as a mixture of local water and the water from western Arabian Sea during winter and Red Sea surface water during summer. The intermediate water, identified as Gulf of Aden Intermediate Water (GAIW), occupies about 9% of the total volume of GA; a characteristic salinity minimum is associated with it at σθ=26.50 kg m?3. The northward spread of sub-tropical subsurface water from the south appears to be the major source of GAIW. The bottom water, named Gulf of Aden Bottom Water, showed the least variability. It was formed due to the mixing of Red Sea Water and water of southern origin. Mixing triangles have been used to analyze the composition of water in the GA.
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机译：自1920年以来从亚丁湾收集的水文数据已被汇编，以识别和完善亚丁湾（GA）水质的定义，并描述其时空变化。基于它们的θ-S特性，已经确定了四个水团。从红海流出的红海水（RSW）是通用航空中最突出的水;它约占亚丁湾总量的37％。亚丁湾地表水（〜3％）由当地水和冬季的阿拉伯海西部的水，夏季的红海地表水混合而成。被称为亚丁湾中级水（GAIW）的中级水约占通用航空总体积的9％。 σθ= 26.50 kg m？3时，具有最小的盐度特征。亚热带地下水从南部向北的扩散似乎是GAIW的主要来源。名为亚丁湾底水湾的底水变化最小。它是由于红海水和南部来源的水混合而成的。混合三角形已用于分析GA中水的成分。
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