Gross oxygen production and microbial community respiration in the oligotrophic ocean

IF 3.8 1区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Pub Date : 2025-03-14 DOI:10.1002/lno.70023

Sara Ferrón, Karin M. Björkman, Matthew J. Church, David M. Karl

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Abstract

Uncertainties in the temporal and spatial patterns of marine primary production and respiration limit our understanding of the ocean carbon (C) cycle and our ability to predict its response to environmental changes. Here we present a comprehensive time‐series analysis of plankton metabolism at the Hawaii Ocean Time‐series program site, Station ALOHA, in the North Pacific Subtropical Gyre. Vertical profiles of gross oxygen production (GOP) and community respiration (CR) were quantified using the 18O‐labeled water method together with net changes in O2 to Ar ratios during dawn to dusk in situ incubations. Rates of 14C‐bicarbonate assimilation (14C‐based primary production [14C‐PP]) were also determined concurrently. During the observational period (April 2015 to July 2020), euphotic zone depth‐integrated (0–125 m) GOP and 14C‐PP ranged from 35 to 134 mmol O2 m−2 d−1 and 18 to 75 mmol C m−2 d−1, respectively, while CR ranged from 37 to 187 mmol O2 m−2 d−1. All biological rates varied with depth and season, with seasonality most pronounced in the lower portion of the euphotic zone (75–125 m). The mean annual ratio of GOP to 14C‐PP was 1.7 ± 0.1 mol O2 (mol C)−1. While previous studies have reported convergence of GOP and 14C‐PP with depth, we find a less pronounced vertical decline in the GOP to 14C‐PP ratios, with GOP exceeding 14C‐PP by 50% or more in the lower euphotic zone. Variability in CR was higher than for GOP, driving most of the variability in the balance between the two.

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寡营养海洋的氧气总产量和微生物群落呼吸作用

海洋初级生产和呼吸作用时空模式的不确定性限制了我们对海洋碳（C）循环的理解以及预测其对环境变化的反应的能力。在此，我们对北太平洋亚热带环流中的夏威夷海洋时间序列计划站点 ALOHA 站的浮游生物新陈代谢进行了全面的时间序列分析。在黎明到黄昏的原地培养过程中，我们采用 18O 标记水法对总产氧量（GOP）和群落呼吸量（CR）的垂直分布以及氧气与氩气比率的净变化进行了量化。同时还测定了 14C 碳酸氢盐同化速率（基于 14C 的初级生产 [14C-PP]）。在观测期间（2015 年 4 月至 2020 年 7 月），透光层深度整合（0-125 米）的 GOP 和 14C-PP 分别为 35 至 134 mmol O2 m-2 d-1 和 18 至 75 mmol C m-2 d-1，而 CR 为 37 至 187 mmol O2 m-2 d-1。所有生物速率都随深度和季节而变化，其中在透光层下部（75-125 米）的季节性最为明显。GOP 与 14C-PP 的年平均比率为 1.7 ± 0.1 mol O2 (mol C)-1。以往的研究表明，随着深度的增加，GOP 和 14C-PP 趋于一致，而我们发现 GOP 与 14C-PP 的比率在垂直方向上的下降并不那么明显，在较低的透光带，GOP 比 14C-PP 高出 50%或更多。CR 的变异性比 GOP 的变异性要高，这也是二者平衡变异性的主要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Limnology and Oceanography 地学-海洋学

CiteScore

8.80

自引率

6.70%

发文量

254

审稿时长

3 months

期刊介绍： Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.