Mesoscale and submesoscale contributions to high sea surface chlorophyll in subtropical gyres
Mesoscale and submesoscale contributions to high sea surface chlorophyll in subtropical gyres
复制标题
副热带环流中尺度和亚尺度对高海表面叶绿素的贡献
DOI：
10.1029/2019gl085278
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Huijie Xue
中科院分区：
文献类型：
--
作者：
Mingxian Guo;Peng Xiu;Fei Chai;Huijie Xue
众所周知，海洋中尺度涡旋可以改变营养供应，刺激浮游植物生长，并显著影响碳固定。与中尺度涡旋相关的亚中尺度过程被认为会诱发更强的浮游植物动力学变异性；然而，它们对全球海洋的大规模影响尚未得到定量评估。通过结合多个卫星产品来解决中尺度和亚中尺度的动力机制，我们评估了它们对高海面叶绿素的贡献。我们的研究结果表明，不同环流中与高叶绿素相关的主导动力学并不相同，并且在中尺度和亚中尺度之间存在差异。在全球副热带环流中，中尺度涡旋周围的亚中尺度结构对高叶绿素的贡献与中尺度涡旋相当（34.1%比30.8%）。这些结果扩展了我们目前对涡旋对生物地球化学过程影响的理解，并可能对全球碳循环具有重要意义。
Mesoscale eddies in the oceans are known to modify the nutrient supply, stimulate phytoplankton growth, and significantly affect carbon fixation. Submesoscale processes associated with mesoscale eddies have been suggested to induce even stronger variability in phytoplankton dynamics; however, their large‐scale impact has not been quantitatively evaluated in the global ocean. By combining multiple satellite products to resolve both mesoscale and submesoscale dynamic regimes, we evaluated their contributions to high sea surface chlorophyll. Our results reveal that the dominant dynamics associated with high chlorophyll in different gyres are not the same and can vary from the mesoscale to the submesoscale. In subtropical gyres worldwide, the contribution of submesoscale structures around mesoscale eddies to high chlorophyll is comparable to that of mesoscale eddies (34.1% versus 30.8%). These results extend our current understanding of the impacts of eddies on biogeochemical processes and may have important implications for the global carbon cycle.