The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends

The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends
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氧气需求和供应对历史海洋氧气趋势的区域重要性

DOI:
10.1029/2021gl094797
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发表时间:
2021
影响因子:
5.2
通讯作者:
Buchanan P
Buchanan P
中科院分区:
地球科学1区
文献类型:
--
作者:
Buchanan P

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海洋脱氧是海洋生态系统的一种新危害,也是人为变化的一个特征。内部海洋氧气浓度会对供应氧气的通风变化和消耗氧气的生物地球化学过程的需求做出反应。更好地了解其区域重要性将提高对地球系统模型预测的信心,从而支撑生态系统风险和脆弱性评估。通过事后再分析模拟,我们发现 1975 年至 2014 年东部边缘低氧区域的氧气趋势受到改变需氧量的生物地球化学过程的强烈影响,而公海的富氧区域则受到通风变化的驱动。 CMIP6 地球系统模型中也出现了类似的区域区别。因此,虽然生物地球化学功能是低纬度、低氧地区不确定性的重要来源,但全球趋势的不确定性是由于地球系统模型中物理供应变化不足造成的,这一点通过南部中纬度地区的重复水文剖面数据得到证实。
Ocean deoxygenation is an emerging hazard for marine ecosystems and a fingerprint of anthropogenic change. Interior ocean oxygen concentrations respond to changes in ventilation that supply oxygen and the demand of biogeochemical processes that consume oxygen. A better understanding of their regional importance would improve confidence in Earth System Model projections, which underpin ecosystem risk and vulnerability assessments. Using a hindcast reanalysis simulation, we find that oxygen trends between 1975 and 2014 in low‐oxygen zones along eastern margins are strongly affected by biogeochemical processes that alter oxygen demand, while oxygen‐rich regions of the open ocean are driven by ventilation changes. A similar regional distinction emerges among CMIP6 Earth System Models. Therefore, while biogeochemical functioning is an important source of uncertainty in low‐latitude, low‐oxygen regions, uncertainty in global trends is due to insufficient physical supply changes in Earth System Models, which is confirmed using repeat hydrographic section data in the southern mid‐latitudes.
DOI: 10.1029/2020gl089688
发表时间: 2020-09-16
影响因子: 5.2
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