The role of water masses in shaping the distribution of redox active compounds in the Eastern Tropical North Pacific oxygen deficient zone and influencing low oxygen concentrations in the eastern Pacific Ocean
The role of water masses in shaping the distribution of redox active compounds in the Eastern Tropical North Pacific oxygen deficient zone and influencing low oxygen concentrations in the eastern Pacific Ocean
复制标题
水团在塑造东部热带北太平洋缺氧区氧化还原活性化合物分布和影响东太平洋低氧浓度中的作用
DOI：
10.1002/lno.11412
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发表时间：
2020
影响因子：
4.5
通讯作者：
Moffett, James W.
中科院分区：
文献类型：
--
作者：
Evans, Natalya;Boles, Elisabeth;Kwiecinski, Jarek V.;Mullen, Susan;Wolf, Martin;Devol, Allan H.;Moriyasu, Rintaro;Nam, SungHyun;Babbin, Andrew R.;Moffett, James W.
海洋缺氧区以各种方式影响全球生物地球化学循环，最显著的是作为固定氮的汇（Codispoti等人，2001年）。对热带北太平洋东部（ETNP）两个航次的数据进行了最佳多参数分析，以建立该区域大ODZ的水团分析。该分析表明，最明显的缺氧条件是在13°C水（13 CW）质量内，其通过次表面中尺度特征分布，例如从加州暗流分支的涡流。亚硝酸盐在这些漩涡中积累，略低于13 CW的核心。水团分析还表明，13 CW和较深的北方赤道太平洋中层水（NEPIW）是加州海流系统的两个太平洋赤道沃茨。赤道次表层水和亚热带次表层水是13 CW的同义词，本研究根据其历史将该水团称为13 CW。由于13 CW已被发现主导了东热带南太平洋臭氧破坏区和秘鲁-智利暗流内最明显的缺氧条件，13 CW和NEPIW定义了整个东太平洋氧气最低条件的边界。
Oceanic oxygen deficient zones (ODZs) influence global biogeochemical cycles in a variety of ways, most notably by acting as a sink for fixed nitrogen (Codispoti et al. 2001). Optimum multiparameter analysis of data from two cruises in the Eastern Tropical North Pacific (ETNP) was implemented to develop a water mass analysis for the large ODZ in this region. This analysis reveals that the most pronounced oxygen deficient conditions are within the 13°C water (13CW) mass, which is distributed via subsurface mesoscale features such as eddies branching from the California Undercurrent. Nitrite accumulates within these eddies and slightly below the core of the 13CW. This water mass analysis also reveals that the 13CW and deeper Northern Equatorial Pacific Intermediate Water (NEPIW) act as the two Pacific Equatorial source waters to the California Current System. The Equatorial Subsurface Water and Subtropical Subsurface Water are synonymous with the 13CW and this study refers to this water mass as the 13CW based on its history. Since the 13CW has been found to dominate the most pronounced oxygen deficient conditions within the Eastern Tropical South Pacific ODZ and the Peru‐Chile Undercurrent, the 13CW and the NEPIW define boundaries for oxygen minimum conditions across the entire eastern Pacific Ocean.
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