Nitrous Oxide Distributions in the Oxygenated Water Column of the Sargasso Sea

IF 1.6 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmosphere-Ocean Pub Date : 2022-12-15 DOI:10.1080/07055900.2022.2153325

Annaliese C. S. Meyer, J. Cullen, D. Grundle

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引用次数: 0

Abstract

ABSTRACT This study presents dissolved nitrous oxide (N2O) concentrations in the water column at the Bermuda Atlantic Time-series Study (BATS) station and uses a subset of these measurements to estimate air-to-sea flux for four specific time points between September 2018 and June 2019. N2O concentrations at BATS were in the range of 4.0 nmol L−1–16.9 nmol L−1, with vertical profiles which were the mirror inverse of dissolved oxygen. Regardless of season, N2O concentration maxima were found within the oxygen minimum zone (OMZ). The highest maximum N2O values were observed in November and lowest in October. As the water column at BATS remains consistently at dissolved oxygen concentrations greater than 140 µmol L−1, and therefore aerobic, we assume that the bulk of N2O production occurs through nitrification. A nitrification source is supported by a correlation between excess N2O (ΔN2O) below the mixed layer, apparent oxygen utilization (AOU) and nitrate concentrations. We estimate a pooled average yield of 0.027% to 0.038% N2O from nitrification at BATS. Finally, estimates of air–sea exchange of N2O using regional average monthly wind speeds indicated that this region acts as a weak source or a sink of atmospheric N2O, and varies between months.

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马尾藻海含氧水柱中氧化亚氮的分布

本研究展示了百慕大大西洋时间序列研究(BATS)站水柱中溶解的一氧化二氮(N2O)浓度，并使用这些测量数据的一个子集来估计2018年9月至2019年6月四个特定时间点的海气通量。N2O浓度在4.0 nmol L−1 ~ 16.9 nmol L−1之间，垂直分布与溶解氧相反。无论季节如何，N2O浓度最大值均出现在氧最小带(OMZ)内。N2O最大值在11月最高，10月最低。由于BATS的水柱始终保持溶解氧浓度大于140µmol L−1，因此是好氧的，我们假设大部分N2O的产生是通过硝化作用发生的。混合层下过量N2O (ΔN2O)、表观氧利用率(AOU)和硝酸盐浓度之间的相关性支持硝化源。我们估计BATS的硝化反应的合计平均N2O产量为0.027%至0.038%。最后，利用区域月平均风速估算的N2O海气交换表明，该区域是大气N2O的弱源或汇，且在月份之间存在差异。

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

Atmosphere-Ocean 地学-海洋学

CiteScore

2.50

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed: climate and climatology; observation technology, remote sensing; forecasting, modelling, numerical methods; physics, dynamics, chemistry, biogeochemistry; boundary layers, pollution, aerosols; circulation, cloud physics, hydrology, air-sea interactions; waves, ice, energy exchange and related environmental topics.