Mapping the global variation in the efficiency of ocean alkalinity enhancement for carbon dioxide removal

IF 4 2区 化学 Q1 BIOCHEMICAL RESEARCH METHODS
Mengyang Zhou, Michael D. Tyka, David T. Ho, Elizabeth Yankovsky, Scott Bachman, Thomas Nicholas, Alicia R. Karspeck, Matthew C. Long
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引用次数: 0

Abstract

To limit global warming to below 2 °C by 2100, CO2 removal from the atmosphere will be necessary. One promising method for achieving CO2 removal at scale is ocean alkalinity enhancement (OAE), but there are challenges with incomplete air–sea CO2 equilibration, which reduces the efficiency of carbon removal. Here, we present global maps of OAE efficiency, and assess the seasonal variation in efficiency. We find that the equilibration kinetics have two characteristic timescales: rapid surface equilibration followed by a slower second phase, which represents the re-emergence of excess alkalinity that was initially subducted. These kinetics vary considerably with latitude and the season of alkalinity release, which are critical factors for determining the placement of potential OAE deployments. Additionally, we quantify the spatial and temporal scales of the induced CO2 uptake, which helps identify the requirements for modelling OAE in regional ocean models.

Abstract Image

绘制海洋碱度提升去除二氧化碳效率的全球变化图
要在 2100 年前将全球变暖控制在 2 °C 以下,就必须从大气中去除二氧化碳。海洋碱度增强(OAE)是实现大规模二氧化碳去除的一种可行方法,但由于海气二氧化碳平衡不完全,降低了碳去除的效率。在这里,我们展示了全球 OAE 效率图,并评估了效率的季节性变化。我们发现,平衡动力学有两个特征时间尺度:快速的表面平衡,随后是较慢的第二阶段,这代表了最初潜入的过量碱度的重新出现。这些动力学随纬度和碱度释放季节的不同而有很大差异,这是确定潜在 OAE 部署位置的关键因素。此外,我们还量化了诱导二氧化碳吸收的空间和时间尺度,这有助于确定在区域海洋模式中模拟 OAE 的要求。
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来源期刊
CiteScore
9.00
自引率
2.10%
发文量
236
审稿时长
1.4 months
期刊介绍: Bioconjugate Chemistry invites original contributions on all research at the interface between man-made and biological materials. The mission of the journal is to communicate to advances in fields including therapeutic delivery, imaging, bionanotechnology, and synthetic biology. Bioconjugate Chemistry is intended to provide a forum for presentation of research relevant to all aspects of bioconjugates, including the preparation, properties and applications of biomolecular conjugates.
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