Formation and circulation of dense water in the Persian/Arabian Gulf
Formation and circulation of dense water in the Persian/Arabian Gulf
复制标题
波斯/阿拉伯湾稠水的形成和循环
DOI：
10.1029/2002jc001360
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发表时间：
2003
影响因子：
--
通讯作者：
A. Bower
中科院分区：
文献类型：
--
作者：
S. Swift;A. Bower
[1] 通过检查历史水文观测数据库，对波斯/阿拉伯湾（以下简称海湾）水团的性质和循环进行了调查。最稠密的水在冬季形成于海湾北端，而不是温暖的南部和西部海岸。除了直接位于海底上方的少量水外，从海湾流出的大部分水都会穿过密度前沿混合，该密度前沿将海湾内的海湾深水与印度洋表层水（IOSW）分开。与之前的推论相反，IOSW 对海湾的季节性变化入侵在春末达到顶峰。这个时间可能是由于蒸发率变化引起的海面坡度的季节性变化。为了解释其他地方发表的系泊结果显示霍尔木兹海峡（以下简称海峡）体积通量的季节性变化相对较小，我们认为这种通量是由盆地内部的海湾深水与海湾外可比深度的水密度之间的差异驱动的。这种密度差异在一年中变化小于 15%。由于岛屿和浅滩对潮汐流的地形收缩，海峡的垂直混合率高，向西延伸约 200 公里。
[1] The nature and circulation of water masses in the Persian/Arabian Gulf (hereinafter referred to as the Gulf) is investigated by examination of a historic database of hydrographic observations. The densest water forms in winter at the northern end of the Gulf rather than along the warmer southern and western coasts. With the exception of small amounts of water directly above the seafloor, most water flowing out of the Gulf mixes across a density front that separates Gulf Deep Water within the Gulf from the Indian Ocean Surface Water (IOSW). Contrary to previous inferences, the seasonally variable incursion of IOSW into the Gulf peaks in late spring. This timing may be due to seasonal changes in sea surface slope driven by variations in evaporation rate. In order to explain mooring results published elsewhere that show relatively small seasonal changes in the volume flux through the Strait of Hormuz (hereinafter referred to as the Strait), we suggest that this flux is driven by the difference between the density of Gulf Deep Water in the interior of the basin and water at comparable depths outside the Gulf. This density difference varies less than 15% during the year. High rates of vertical mixing in the Strait extend about 200 km westward in response to topographic constriction of tidal flows by islands and shoals.