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 al...

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Detalles Bibliográficos
Autores: Khan, Hares, Marcé, Rafael, Laas, Alo, Obrador Sala, Biel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/178698
Acceso en línea:https://hdl.handle.net/2445/178698
Access Level:acceso abierto
Palabra clave:Calcificació
Ecologia dels llacs
Cicle del carboni (Biogeoquímica)
Calcification
Lake ecology
Carbon cycle (Biogeochemistry)
Descripción
Sumario: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.