| LIU Zenghong,XU Jianping,SUN Chaohui,WU Xiaofen. 2014. An upper ocean response to Typhoon Bolaven analyzed with Argo profiling floats. Acta Oceanologica Sinica, 33(11):90－101 |
| An upper ocean response to Typhoon Bolaven analyzed with Argo profiling floats |
| 利用Argo剖面浮标分析上层海洋对台风“布拉万”的响应 |
| Received:October 29, 2012 Revised:July 29, 2014 |
| DOI：10.1007/s13131-014-0558-7 |
| Key words:Typhoon Bolaven Argo profiling floats upper ocean response ocean heat content |
| 中文关键词: 台风“布拉万” Argo剖面浮标 上层海洋响应 海洋热含量 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Zenghong | 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, China | liuzenghong@139.com | | XU Jianping | 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, China | | | SUN Chaohui | State Key Laboratory Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | WU Xiaofen | 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. |
| 中文摘要: |
| 本文利用2012年8月20－29日期间西北太平洋台风“布拉万” (Bolaven)经过海区的Argo剖面浮标观测资料, 并结合卫星遥感SST和降水资料, 分析了海洋上层对该台风的响应。结果表明, 台风过后混合层内的响应主要体现在混合层深度(MLD) 加深、混合层温度(MLT) 下降等；混合层盐度(MLS)变化受到降水、蒸发、湍流混合和跃层抬升等过程的影响, 盐度的增、降幅度大体相当。MLD加深及MLT下降具有明显的右偏特征, 而MLS的变化在台风左侧下降、右侧增加。由铱星Argo剖面浮标的加密观测发现, 在台风“布拉万”(发展阶段)左侧、台风最大风速半径以外区域的海温分布呈近表层降温而次表层增暖的趋势, 且在混合层底部及温跃层顶部盐度明显增加；在台风路径右侧(成熟阶段)、台风中心附近海域200×104 Pa以上(温跃层顶部除外) 海水温度明显下降。受台风中心附近强上升流的影响, 使得次表层高盐水进入近表层, 盐度明显增加。由下降流引起的从混合层至温跃层的“热泵” 作用, 以及由正风应力旋度引起的上升流, 是台风路径两侧出现不同温、盐度变化过程的主要原因。次表层海水的异常变化似乎比混合层内的需要更多的时间才能恢复到台风前的状态。 |
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