| 利用Argo剖面浮标分析上层海洋对台风“布拉万”的响应 |
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| 引用本文： | 刘增宏,许建平,孙朝辉,吴晓芬.利用Argo剖面浮标分析上层海洋对台风“布拉万”的响应[J].海洋学报(英文版),2014,33(11):90-101. |
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| 作者姓名： | 刘增宏 许建平 孙朝辉 吴晓芬 |
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| 作者单位： | 卫星海洋环境动力学国家重点实验室, 浙江杭州 310012;国家海洋局第二海洋研究所, 浙江杭州 310012;卫星海洋环境动力学国家重点实验室, 浙江杭州 310012;国家海洋局第二海洋研究所, 浙江杭州 310012;卫星海洋环境动力学国家重点实验室, 浙江杭州 310012;卫星海洋环境动力学国家重点实验室, 浙江杭州 310012 |
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| 基金项目： | The National Basic Research Program (973 Program) of China under contract No.2013CB430301，the National Natural Science Foundation of China under contract No.41206022，the Ministry of Science and Technology of China under contract No.2012FY112300 |
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| 摘 要： | In situ observations from Argo profiling floats combined with satellite retrieved SST and rain rate are used to investigate an upper ocean response to Typhoon Bolaven from 20 through 29 August 2012. After the passage of Typhoon Bolaven, the deepening of mixed layer depth(MLD), and the cooling of mixed layer temperature(MLT) were observed. The changes in mixed layer salinity(MLS) showed an equivalent number of increasing and decreasing because the typhoon-induced salinity changes in the mixed layer were influenced by precipitation, evaporation, turbulent mixing and upwelling of thermocline water. The deepening of the MLD and the cooling of the MLT indicated a significant rightward bias, whereas the MLS was freshened to the left side of the typhoon track and increased on the other side. Intensive temperature and salinity profiles observed by Iridium floats make it possible to view response processes in the upper ocean after the passage of a typhoon. The cooling in the near-surface and the warming in the subsurface were observed by two Iridium floats located to the left side of the cyclonic track during the development stage of the storm, beyond the radius of maximum winds relative to the typhoon center. Water salinity increases at the base of the mixed layer and the top of the thermocline were the most obvious change observed by those two floats. On the right side of the track and near the typhoon center when the typhoon was intensified, the significant cooling from sea surface to a depth of 200×104 Pa, with the exception of the water at the top of the thermocline, was observed by the other Iridium float. Owing to the enhanced upwelling near the typhoon center, the water salinity in the near-surface increased noticeably. The heat pumping from the mixed layer into the thermocline induced by downwelling and the upwelling induced by the positive wind stress curl are the main causes for the different temperature and salinity variations on the different sides of the track. It seems that more time is required for the anomalies in the subsurface to be restored to pretyphoon conditions than for the anomalies in the mixed layer.
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| 关 键 词： | 台风中心 剖面浮标 上层海洋 Argo 混合层深度 盐度变化 万用 最大风速半径 |
| 收稿时间： | 2012/10/29 0:00:00 |
| 修稿时间： | 2014/7/29 0:00:00 |
An upper ocean response to Typhoon Bolaven analyzed with Argo profiling floats |
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| LIU Zenghong,XU Jianping,SUN Chaohui and WU Xiaofen.An upper ocean response to Typhoon Bolaven analyzed with Argo profiling floats[J].Acta Oceanologica Sinica,2014,33(11):90-101. |
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| Authors: | LIU Zenghong XU Jianping SUN Chaohui and WU Xiaofen |
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| Institution: | 1.State Key Laboratory Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China2.State Key Laboratory Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | In situ observations from Argo profiling floats combined with satellite retrieved SST and rain rate are used to investigate an upper ocean response to Typhoon Bolaven from 20 through 29 August 2012. After the passage of Typhoon Bolaven, the deepening of mixed layer depth (MLD), and the cooling of mixed layer temperature (MLT) were observed. The changes in mixed layer salinity (MLS) showed an equivalent number of increasing and decreasing because the typhoon-induced salinity changes in the mixed layer were influenced by precipitation, evaporation, turbulent mixing and upwelling of thermocline water. The deepening of the MLD and the cooling of the MLT indicated a significant rightward bias, whereas the MLS was freshened to the left side of the typhoon track and increased on the other side. Intensive temperature and salinity profiles observed by Iridium floats make it possible to view response processes in the upper ocean after the passage of a typhoon. The cooling in the near-surface and the warming in the subsurface were observed by two Iridium floats located to the left side of the cyclonic track during the development stage of the storm, beyond the radius of maximum winds relative to the typhoon center. Water salinity increases at the base of the mixed layer and the top of the thermocline were the most obvious change observed by those two floats. On the right side of the track and near the typhoon center when the typhoon was intensified, the significant cooling from sea surface to a depth of 200×104 Pa, with the exception of the water at the top of the thermocline, was observed by the other Iridium float. Owing to the enhanced upwelling near the typhoon center, the water salinity in the near-surface increased noticeably. The heat pumping from the mixed layer into the thermocline induced by downwelling and the upwelling induced by the positive wind stress curl are the main causes for the different temperature and salinity variations on the different sides of the track. It seems that more time is required for the anomalies in the subsurface to be restored to pretyphoon conditions than for the anomalies in the mixed layer. |
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| Keywords: | Typhoon Bolaven Argo profiling floats upper ocean response ocean heat content |
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