19 October 2012 Remote sensing and buoy based effect analysis of typhoon on hypoxia off the Changjiang (Yangtze) Estuary
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Abstract
The variations of Dissolved Oxygen (DO) in the near-bottom waters off the Changjiang (Yangtze River) Estuary before and after the passage of typhoons are investigated using both remotely sensed and in situ data sets. The Ekman pumping velocity during and after Typhoon was calculated. From buoys observation, typhoon passed by cause the water exchange between upper and lower layer. The mixture made the Dissolved Oxygen (DO) level changed to high level in short time. The level of DO at 50 m increased from 3.2 to 6.2 during the period of strong winds (< 30 knots) of Typhoon Muifa. The mixing process occurred in a short time, about 1-2 hours. The raise and resume result also has been verified from cruise observations. Typhoon effects hypoxia in many aspects. Typhoon can affect hypoxia in many ways. SST decreases as typhoon passes directly over the water. The concentrations of surface Chl a increase gradually due to mixing triggered by the typhoon. The affected area and time of change of hypoxia depend on the wind speed and the movement of the typhoon as well as the water depth.
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Jianyu Chen, Jianyu Chen, Xiaobo Ni, Xiaobo Ni, Zhihua Mao, Zhihua Mao, Yifan Wang, Yifan Wang, Lijin Liang, Lijin Liang, Fang Gong, Fang Gong, "Remote sensing and buoy based effect analysis of typhoon on hypoxia off the Changjiang (Yangtze) Estuary", Proc. SPIE 8532, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012, 853211 (19 October 2012); doi: 10.1117/12.974398; https://doi.org/10.1117/12.974398
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