Influence of Wave Action on Applications of Olivine-Based Ocean Alkalinity Enhancement on Sandy Beaches

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-04-24 DOI:10.1029/2025GL114922

Paige I. England, Lennart T. Bach

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Abstract

Ocean Alkalinity Enhancement (OAE) is an emerging carbon dioxide removal approach that aims to store additional atmospheric CO₂ as (bi)carbonate in seawater. OAE can be realized through a variety of pathways, one of which is the dispersal of alkaline mineral sand on beaches where wave energy shall accelerate alkalinity formation. Here, we built a “Beach-Machine” to simulate a gradient of wave energy and test its effect on alkalinity formation by olivine, a widely considered mineral for OAE. We find that wave energy strongly (linearly) increases alkalinity formation from olivine when energy input is beyond a certain threshold. However, when olivine is mixed with organic-poor sand, energy input also increases the loss of alkalinity possibly by promoting precipitation reactions thereby canceling out the benefits of waves on alkalinity formation. Our experiments show that the effects of wave energy on OAE efficiency are dependent on the sediment where olivine-based OAE is applied.

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波浪作用对橄榄石基海洋增碱剂在沙滩上应用的影响

海洋碱度增强（OAE）是一种新兴的二氧化碳去除方法，旨在将大气中额外的二氧化碳以（bi）碳酸盐的形式储存在海水中。OAE可以通过多种途径实现，其中一种途径是碱性矿砂在海滩上的扩散，波浪能会加速碱度的形成。在这里，我们建立了一个“海滩机器”来模拟波浪能量的梯度，并测试它对橄榄石（一种被广泛认为是OAE的矿物）形成碱度的影响。我们发现，当能量输入超过一定阈值时，波能强烈地（线性地）增加橄榄石的碱性形成。然而，当橄榄石与低有机质砂混合时，能量输入也增加了碱度的损失，可能是通过促进降水反应，从而抵消了波浪对碱度形成的好处。实验结果表明，波浪能量对声波发射效率的影响取决于应用橄榄石基声波发射的沉积物。

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

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.