On September 29, 2021, Cyclone Shaheen attained significant development in the Arabian Sea. It proceeded to cross the Gulf of Oman on October 3, causing substantial economic damage and casualties due to the heavy rain and high waves it generated. Using meteorological and satellite data, measuring the physical and chemical properties of the water column by CTD a few days before and after the cyclone, and coastal observations, we analyzed the impact of Cyclone Shaheen on the northern shelf of the Gulf of Oman, Iran. High sea surface temperature in the Arabian Sea favored to strengthen the cyclone toward the Gulf of Oman. Strong winds over 20ms caused a dust storm on the Iranian Makran coast followed by heavy rains of 72mm during a day with extensive flooding. Before the passage of cyclone Shaheen, the surface water temperature in the northern shelf of the Gulf of Oman was about 32C and the dissolved oxygen concentration was 6mgl, which reached the hypoxia threshold at a depth of about 60m. The cyclone intensified the vertical mixing in the upper layer, leading to a decrease in surface water temperature by approximately 2-5 °C. Additionally, it pushed the hypoxia boundary down to a depth of 110m, thereby causing the oxygenated upper layer to become thicker. The current research demonstrates that the Gulf of Oman stratified waters above the oxygen minimum zone could benefit from the passage of the tropical cyclone during the warm season in terms of temperature, dissolved oxygen, and probably dissolved nutrients.

中文翻译：

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阿曼湾北部陆架水域对热带气旋沙欣（2021）通过的响应

2021 年 9 月 29 日，气旋“沙欣”在阿拉伯海获得显着发展。10月3日，它横渡阿曼湾，引发暴雨和巨浪，造成重大经济损失和人员伤亡。利用气象和卫星数据，利用CTD测量气旋前后几天水柱的物理和化学特性，以及沿海观测，我们分析了气旋沙欣对伊朗阿曼湾北部陆架的影响。阿拉伯海海面温度较高，有利于加强向阿曼湾方向的气旋。超过20毫秒的强风在伊朗莫克兰海岸引发沙尘暴，随后全天降雨量达72毫米，并引发大面积洪水。气旋沙欣通过前，阿曼湾北部陆架表层水温约为32℃，溶解氧浓度为6mgl，在60m左右深度达到缺氧阈值。旋风分离器加强了上层的垂直混合，导致地表水温下降约2-5℃。此外，它将缺氧边界推低至110m的深度，从而导致氧化的上层变得更厚。目前的研究表明，在温暖季节热带气旋的通过中，阿曼湾最低含氧区以上的分层水域可能会在温度、溶解氧和可能溶解的营养物质方面受益。