{"title":"The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs","authors":"Hares Khan, R. Marcé, A. Laas, B. Obrador","doi":"10.23818/limn.41.02","DOIUrl":null,"url":null,"abstract":"The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs Calcite precipitation acts as a carbon sink in the sediments and a short-term source of carbon dioxide (CO2) to the atmosphere, as widely acknowledged in marine studies. However, pelagic calcite precipitation has received limited attention in lakes. Here we use the relationship between lake water alkalinity and reported calcification rates to provide the first global estimate of pelagic calcification in lakes. Global gross calcification rates amount to 0.03 Pg C yr-1 (0.01 – 0.07) comparable to rates of organic carbon burial, whereas its related CO2 release is largely buffered by the carbonate equilibria. Calcification occurs at water alkalinity above 1 meq/L corresponding to 57 % of global lake and reservoir surface area. Pelagic calcification therefore is a prevalent process in lakes and reservoirs at the global scale, with a potentially relevant role as a sedimentary inorganic carbon sink, comparable in magnitude to the total calcite accumulation rates in ocean sediments.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Limnetica","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.23818/limn.41.02","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 7
Abstract
The relevance of pelagic calcification in the global carbon budget of lakes and reservoirs Calcite precipitation acts as a carbon sink in the sediments and a short-term source of carbon dioxide (CO2) to the atmosphere, as widely acknowledged in marine studies. However, pelagic calcite precipitation has received limited attention in lakes. Here we use the relationship between lake water alkalinity and reported calcification rates to provide the first global estimate of pelagic calcification in lakes. Global gross calcification rates amount to 0.03 Pg C yr-1 (0.01 – 0.07) comparable to rates of organic carbon burial, whereas its related CO2 release is largely buffered by the carbonate equilibria. Calcification occurs at water alkalinity above 1 meq/L corresponding to 57 % of global lake and reservoir surface area. Pelagic calcification therefore is a prevalent process in lakes and reservoirs at the global scale, with a potentially relevant role as a sedimentary inorganic carbon sink, comparable in magnitude to the total calcite accumulation rates in ocean sediments.
远洋钙化在湖泊和水库全球碳收支中的相关性正如海洋研究中广泛承认的那样,方解石沉淀是沉积物中的碳汇和大气中二氧化碳的短期来源。然而,湖泊中的远洋方解石沉淀受到的关注有限。在这里,我们利用湖水碱度和报告的钙化率之间的关系,首次对湖泊中的浮游钙化进行了全球估计。全球总钙化率为0.03 Pg C yr-1(0.01–0.07),与有机碳埋藏率相当,而其相关的CO2释放在很大程度上受到碳酸盐平衡的缓冲。钙化发生在水碱度高于1meq/L时,相当于全球湖泊和水库表面积的57%。因此,远洋钙化是全球范围内湖泊和水库中普遍存在的过程,作为沉积无机碳汇具有潜在的相关作用,其规模与海洋沉积物中的总方解石积累率相当。
期刊介绍:
Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.