| 摘要: |
| 中尺度涡是影响西北太黑潮延伸体南北海域叶绿素分布的重要因子。通过对2012—2018年NOAA遥感水色卫星数据和法国COPERNICUS流场资料的统计分析，发现中尺度涡对表层叶绿素浓度的影响具有明显的季节性特征。在春季有17%的气旋涡导致中心叶绿素高值结构且多数向西传播，而其余季节对叶绿素浓度影响较弱。反气旋涡导致环状叶绿素高值结构，在春、秋两季常有发生，在冬夏出现频次少。中尺度涡影响叶绿素能力的季节差异可能与营养盐背景场、光限制、等密线等季节性变化有关，不能只考虑风和流场的垂向输运机制。叶绿素浓度在一定程度上反映浮游植物生物量，对黑潮延伸体海域有重要生态意义。因此，该区域服务渔业的中尺度涡研究应该考虑这种季节特征。 |
| 关键词: 黑潮延伸体 中尺度涡 叶绿素 生态系统动力学 |
| DOI：10.11693/hyhz20191100234 |
| 分类号:P731 |
| 基金项目:国家重点研发计划，2019YFD0901404号；国家自然基金面上项目，NSFC41876141号；上海海洋大学“淞航号”前沿科学共享航次项目，A1-3201-19-30046号。 |
附件 |
|
| SEASONAL CHARACTERISTICS OF CHLOROPHYLL A CONCENTRATION IN KUROSHIO EXTENSION AND INFLUENCES OF MESOSCALE EDDIES |
|
HU Song1,2,3, LI Min-Hua1, LIU Bi-Lin1,2, ZHOU Xiang-Qian1, YU Wei1,2
|
|
1.College of Marin Sciences, Shanghai Ocean University, Shanghai 201306, China;2.National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;3.Shanghai Engineering Research Center for Estuarine and Oceanographic Mapping, Shanghai 201306, China
|
| Abstract: |
| The mesoscale eddy is one of the most important factors influencing the distribution of chlorophyll a (chl a) in the Kuroshio extension of the Northwest Pacific. Based on statistical analysis on the weekly remote-sensing ocean surface chl a concentration data from NOAA, and geostrophic current data from Copernicus for the period of 2012—2018, we found that the influence of mesoscale eddy on the surface chl a concentration showed significant seasonal characteristics. About 17% of the cyclonic eddies in spring had high chl a concentration in the center and propagate westward. However, the cyclonic eddies in other seasons have a little effect on chl a concentration. The anticyclonic eddies generate a high chl a ring in both spring and autumn, with a little effect on chl a concentration in summer and winter. The seasonal characteristics of chl a in mesoscale eddies may relate to seasonal nutrient-limitation, light-limitation or the change of pycnocline, indicating that wind- and flow-induced vertical nutrient transport is not the only factor to be considered. The chl a concentration can represent phytoplankton biomass to some extents, which is important for the regional ecosystem. Thus, the effect of seasonal feature of mesoscale eddy should be considered in the studies for fisheries. |
| Key words: Kuroshio extension mesoscale eddy chlorophyll a ecosystem dynamics |
