西北太平洋台风对冷涡及叶绿素浓度的影响Research on Cold Core Eddy Change and Phytoplankton Bloom Induced by Typhoons: Case Studies in Northwest Pacific Ocean
王同宇;张书文;蒋晨;刘潇;曾伟强;李韬;
摘要(Abstract):
【目的】研究2007—2017年间西北太平洋过境冷涡的11个台风导致浮游植物生长和冷涡(CCE)变化现象。【方法】统计并计算出可能影响叶绿素(Chl-a)浓度变化的因素:台风性质(强度、移动速度、强迫时间)、台风前混合层厚度(MLD)、降雨量、海表面温度(SST)、埃克曼抽吸速率(EPV)和两层约化重力模式下的涡动能(EKE),其中EPV和EKE分别代表上升流和湍流混合强弱。【结果与结论】通过线性回归分析发现,除台风强度、SST与Chl-a浓度相关性不显著(P>0.05),移动速度Uh、强迫时间、降雨和MLD、EPV、EKE与Chl-a均有显著相关性(P<0.05),并建立了冷涡背景条件下的多元线性回归模型:?=0.006-0.038 x_1+0.0257x_2+0.023 8 x_3。浮游植物生长主要取决于上升流和湍流混合对营养盐的输送作用,慢而尺度大台风意味着受台风强迫时间长,足以超过地球自转调整的时间则会引起强上升流(EPV)以及湍流混合输送营养盐,促进Chl-a浓度大幅度增加,强湍流混合同时也需要降雨抑制,避免破坏浮游植物光合作用,台风前CCE区域MLD(<25m)与Chl-a呈现出正相关。
关键词(KeyWords): 西北太平洋;台风;冷涡;浮游植物生长;多元线性回归
基金项目(Foundation): 国家重点研发计划重点专项(2016YFC1401403);; 国家自然科学基金面上项目(41676008和41876005);; 国际合作项目(GASI-IPOVI-04);; 广东省自然科学基金(2016A030312004)
作者(Authors): 王同宇;张书文;蒋晨;刘潇;曾伟强;李韬;
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