Seasonal Modulation of Dissolved Oxygen in the Equatorial Pacific by Tropical Instability Vortices
Seasonal Modulation of Dissolved Oxygen in the Equatorial Pacific by Tropical Instability Vortices
复制标题
热带不稳定涡旋对赤道太平洋溶解氧的季节性调节
DOI：
10.1029/2021jc017567
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Merrifield, M. A.
中科院分区：
文献类型：
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作者：
Eddebbar, Y. A.;Subramanian, A. C.;Whitt, D. B.;Long, M. C.;Verdy, A.;Mazloff, M. R.;Merrifield, M. A.
热带不稳定涡对赤道太平洋的物理和生物地球化学具有重要影响。利用社区地球系统模型（CESM‐HR）的涡解析配置和拉格朗日粒子跟踪，我们研究了TIV对赤道太平洋上层水体中溶解氧（O2）三维结构和变异的影响。在CESM‐HR中，从北方夏季到冬季，模拟的tiv的产生和向西传播导致赤道北部太平洋上部的季节性氧合，表现为120°W以西缺氧深度的加深。TIV对赤道太平洋氧平衡的影响以涡流和混合为主，间接TIV对o2消耗的影响较小。这些平流效应反映了涡旋抽运对等压线的瞬时位移，以及涡旋捕获、搅拌和俯冲对氧的涡旋输送。tiv对赤道上太平洋o2分布和变率的影响对理解和模拟海洋生态系统动态和生境具有重要意义，在设计该地区的观测网络时应加以考虑。
Tropical instability vortices (TIVs) have a major influence on the physics and biogeochemistry of the equatorial Pacific. Using an eddy‐resolving configuration of the Community Earth System Model (CESM‐HR) and Lagrangian particle tracking, we examine TIV impacts on the three‐dimensional structure and variability of dissolved oxygen (O2) in the upper equatorial Pacific water column. In CESM‐HR, the simulated generation and westward propagation of TIVs from boreal summer through winter lead to the seasonal oxygenation of the upper northern equatorial Pacific, exhibited as a deepening of hypoxic depth west of 120°W. TIV effects on the equatorial Pacific oxygen balance are dominated by eddy‐advection and mixing, while indirect TIV effects on O2consumption play minor roles. These advective effects reflect the transient displacements of isopycnals by eddy pumping as well as vortex transport of oxygen by eddy trapping, stirring, and subduction. TIVs influence on the upper equatorial Pacific O2distribution and variability has important implications for understanding and modeling marine ecosystem dynamics and habitats, and should be taken into consideration in designing observation networks in this region.