| 摘要: |
| 近岸海域营养物质普遍充足，因此水文气象过程往往成为赤潮暴发最重要的控制因素。基于福建海洋预报台提供的模式数据，通过对比分析2011-2013年3-5月福建近岸的温度、盐度、环流和上升流结构，阐述了2012年春季福建近岸米氏凯伦藻赤潮暴发的特殊水文结构特征，并通过经验正交函数（empirical orthogonal function，EOF）分析方法探讨了此次赤潮暴发的主要水文原因。结果表明：（1）与其他年份相比，2012年3月福建近岸浙闽沿岸流偏强，海温偏低，不利于东海原甲藻的生长。（2）3月下旬福建近岸温度较其他年份升高迅速，与台湾暖流强度变化有关。（3）3月底-5月18日赤潮暴发前，福建近岸海域整体偏暖，持续的东北风带来稳定的水体向岸流动，水平和垂向上各项要素变化较弱，为米氏凯伦藻赤潮暴发提供了稳定、适宜的环境条件。（4）5月18日赤潮暴发后一周内，赤潮优势种由东海原甲藻转变为米氏凯伦藻以及米氏凯伦藻赤潮整体稍向东迁移的过程，与近岸水温上升至24℃，且东北风转为西南风引起较弱的水体离岸流动有一定关联性。 |
| 关键词: 福建沿岸 赤潮 米氏凯伦藻 经验正交函数(empirical orthogonal function,EOF) |
| DOI：10.11693/hyhz20180700178 |
| 分类号:P731 |
| 基金项目:*国家重点研发计划项目，2017YFC1404300号；“全球变化与海气相互作用”专项，GASI-IPOVAI-04号；卫星海洋环境动力学国家重点实验室自主项目，SOEDZZ1805号，SOEDZZ1803号 |
附件 |
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| COMPARISON IN TEMPERATURE, SALINITY AND CIRCULATION STRUCTURES DURING SPRING OF THE YEARS BEFORE AND AFTER KARENIA MIKIMOTOI BLOOM ALONG FUJIAN COAST IN 2012 |
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YANG Yun1,2, HUANG Hai-Long2, ZENG Yin-Dong3, GUAN Wei-Bing1,2, LI Xue-Ding3, GUO Min-Quan3
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1.Ocean College, Zhejiang University, Zhoushan 316021, China;2.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, MNR, Hangzhou 310012, China;3.Fujian Marine Forecasts, Fuzhou 350003, China
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| Abstract: |
| There is a general abundance of nutrients in the coastal waters, therefore hydrometeorological processes often become the most important controlling factor for the outbreaks of red tide. Based on numerical modeling results provided by the Fujian Marine Forecasts, China, we compared and analyzed the temperature, salinity, circulation and upwelling structures in the Fujian coast, Southeast China, from March to May in 2011-2013, which illustrated the special hydrological structures of Karenia mikimotoi bloom in 2012 along the Fujian coast, and further studied the main hydrological factors of the bloom event using EOF analysis. The results show that, compared with normal years, the Zhe-Min Coastal Current in 2012 was stronger at the beginning of March than that of normal years, resulting in colder sea temperature and lower salinity, which was not favorable for the growth of Prorocentrum donghaiense. The earlier and rapider increase of sea temperature in late March was related to the intensity change of the Taiwan Warm Current. From the end of March to May 18, the sea temperature of the overall coastal waters in the Fujian coast was warmer than that of normal years. The steady northeast wind drove the water flowing stably shoreward, and all the hydrological elements varied slightly in both horizontal and vertical directions, which provided stable and suitable hydrodynamic environmental conditions for the outbreak of Karenia mikimotoi red tide. One week after the red tide outbreak, the red tide dominant species changed from P. donghaiense to K. mikimotoi. Meanwhile, the K. mikimotoi red tide began moving slightly eastward. These processes were related to the warm inshore water (24℃) and to the change of wind direction from northeasterly to southwesterly, causing a weak offshore flow. |
| Key words: Fujian coast red tide Karenia mikimotoi EOF(empirical orthogonal function) |
