{"title":"Calcium carbonate cycling in the Southern Ocean: insights from dissolved calcium and potential alkalinity tracers","authors":"Yaojia Sun, Michael J. Ellwood","doi":"10.1002/lol2.10457","DOIUrl":null,"url":null,"abstract":"The cycling of calcium carbonate (CaCO<jats:sub>3</jats:sub>) plays a significant role in deep‐water carbon sequestration and affects the buffer capacity of the upper ocean for absorbing atmospheric CO<jats:sub>2</jats:sub>. This study investigates the role of dissolved calcium (Ca) and potential alkalinity (PA) as tracers for CaCO<jats:sub>3</jats:sub> cycling in the Southern Ocean. The correlation between PA and Ca concentrations in subantarctic and polar waters supports their use as effective tracers of the process of CaCO<jats:sub>3</jats:sub> dissolution and precipitation. Estimates of particulate inorganic carbon export flux based on Ca concentration reveals substantial contributions in the Southern Ocean, with higher values in the subantarctic waters. These findings highlight the value of Ca and PA as tracers for understanding CaCO<jats:sub>3</jats:sub> cycling and its role in carbon sequestration and buffering atmospheric CO<jats:sub>2</jats:sub>.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"17 1","pages":""},"PeriodicalIF":5.1000,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Limnology and Oceanography Letters","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1002/lol2.10457","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The cycling of calcium carbonate (CaCO3) plays a significant role in deep‐water carbon sequestration and affects the buffer capacity of the upper ocean for absorbing atmospheric CO2. This study investigates the role of dissolved calcium (Ca) and potential alkalinity (PA) as tracers for CaCO3 cycling in the Southern Ocean. The correlation between PA and Ca concentrations in subantarctic and polar waters supports their use as effective tracers of the process of CaCO3 dissolution and precipitation. Estimates of particulate inorganic carbon export flux based on Ca concentration reveals substantial contributions in the Southern Ocean, with higher values in the subantarctic waters. These findings highlight the value of Ca and PA as tracers for understanding CaCO3 cycling and its role in carbon sequestration and buffering atmospheric CO2.
期刊介绍：
Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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