| 摘要: |
| 浙江省南部沿海地区是赤潮灾害事件频发的海区之一。本研究通过现场调查以及利用搭载在极地轨道环境遥感卫星Aqua上的中等分辨率成像光谱仪（Moderate Resolution Imaging Spectro Radiometer，MODIS）传感器数据，研究了2016年5月浙江南部洞头和南麂列岛附近海域东海原甲藻（Prorocentrum donghaiense）主导、夜光藻（Noctiluca scintillans）伴生的混合甲藻赤潮生消特征。结果表明：现场水采浮游植物第一优势种东海原甲藻和网采浮游植物第一优势种夜光藻细胞密度在绝大部分站位超过1.0×107 个/m3 和1.0×105 个/m3、优势度达到0.82和0.34、出现频率则分别为82.46 %和98.25 %。本次东海原甲藻赤潮具有较为完整的生消周期（生长、维持和消亡阶段），而夜光藻每天细胞密度的变化幅度相对较小，因此难以划分明显的生消阶段。另外，基于MODIS影像，根据赤潮指数（RI>2.8）和硅甲藻赤潮水体分类（干净水体、高浑浊水体、混合水体、东海原甲藻赤潮水体、硅藻赤潮水体），在更宏观的角度显示了本次东海原甲藻为主混合赤潮的生消特征。本次赤潮从洞头海域的东北部开始，其中在5月13日结合现场调查数据，发现东海原甲藻赤潮高峰出现在洞头列岛与南麂列岛附近海域，而后逐步向西南海域近岸发展。因此，在现场调查确定赤潮优势种的基础上结合遥感影像可以为赤潮监测提供更加科学合理的结果。 |
| 关键词: 海洋生物学 东海原甲藻 夜光藻 MODIS 赤潮生消 赤潮水体分类 |
| DOI：10.3969/J.ISSN.2095-4972.2021.03.0010 |
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| 基金项目:国家自然科学基金青年基金资助项目（41506194）；浙江省“水产”一流学科开放课题资助项目（20190000） |
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| Occurrence of Prorocentrum donghaiense dominated bloom based on the field investigation and MODIS image study |
| CHEN Lichan,YANG Mengmeng,XU Yongjiu,SHEN Anglü |
| (College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China;Division for LandOcean Ecosystem Research, Institute for SpaceEarth Environmental Research, Nagoya University, Nagoya, Aichi 4648601, Japan;School of Fishery, Zhejiang Ocean University, Zhoushan 316022, China) |
| Abstract: |
| The southern coastal area of Zhejiang Province is one of the popular areas with frequent red tide disa sters. In this paper, the growth and dissipation characteristics of mixed dinoflagellate red tide in the sea area near Dongtou and Nanji Islands in May 2016 were studied by field investigation and using the satellite Aqua data from Moderate Resolution Imaging Spectro Radiometer (MODIS). The results of field investigation showed that the densities of the first dominant species Prorocentrum donghaiense were higher than 1.0×107 cells/m3 and of Noctiluca scintillansby net sample were higher than 1.0×105 cells/m3, the dominance indexes were 0.82 and 0.34, and the frequencies of occurrence were 82.46% and 98.25%, respectively. The occurrence of P. donghaiense bloom could be divided into growth, maintenance and dissipation phases based on the cell abundance. However, the density variations of cell densities of N. scintillans in the whole day was relatively small, and thus it was difficult to distinguished the phases of this bloom. Furthermore, based on MODIS images, according to the red tide index (RI>2.8) and the classification of the different waters (clean water, TSM water, mixed water,P. donghaiensis bloom water, and diatom bloom water), we can better understand the bloom occurrence from a larger space-time scale. This P. donghaiensedominated bloom started from the northeast of Dongtou Islands, combined with the field survey data on May 13, it was found that the bloom peak appeared in the sea area between Dongtou and Nanji Islands, and then gradually developed to the southwest coastal area. Therefore, the combination of field investigation and satellite remote sensing can provide more scientific and reasonable results for red tide monitoring. |
| Key words: marine biology Prorocentrum donghaiense Noctiluca scintillans MODIS algal bloom water classification of red tide |
