Eutrophication and Geochemistry Drive Pelagic Calcite Precipitation in Lakes
| Autor: | Margot Sepp, Biel Obrador, Hares Khan, Rafael Marcé, Alo Laas |
|---|---|
| Přispěvatelé: | Centre for Limnology |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Ecologia dels llacs lcsh:Hydraulic engineering 010504 meteorology & atmospheric sciences Geography Planning and Development alkalinity Context (language use) Aquatic Science 01 natural sciences Biochemistry chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes calcite precipitation lcsh:TC1-978 Dissolved organic carbon medicine Ecosystem lake carbon budge calcite saturation 0105 earth and related environmental sciences Water Science and Technology geochemistry Calcite lcsh:TD201-500 010604 marine biology & hydrobiology Pelagic zone Eutrophication medicine.disease 6. Clean water Oceanography Geochemistry eutrophication chemistry Eutrofització 13. Climate action lake carbon budget articles Environmental science Geoquímica Saturation (chemistry) Lake ecology metabolism Calcification primary production |
| Zdroj: | Water Volume 13 Issue 5 Dipòsit Digital de la UB Universidad de Barcelona Water, Vol 13, Iss 597, p 597 (2021) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w13050597 |
| Popis: | Pelagic calcification shapes the carbon budget of lakes and the sensitivity of dissolved inorganic carbon (DIC) responses to lake metabolism. This process, being tightly linked to primary production, needs to be understood within the context of summer eutrophication which is increasing due to human stressors and global change. Most lake carbon budget models do not account for calcification because the conditions necessary for its occurrence are not well constrained. This study aims at identifying ratios between calcification and primary production and the drivers that control these ratios in freshwater. Using in situ incubations in several European freshwater lakes, we identify a strong relationship between calcite saturation and the ratio between calcification and net ecosystem production (NEP) (p-value < 0.001, R2 = 0.95). NEP-induced calcification is a short-term process that is potentiated by the increase in calcite saturation occurring at longer time scales, usually reaching the highest levels in summer. The resulting summer calcification event has effects on the DIC equilibria, causing deviations from the metabolic 1:1 stoichiometry between DIC and dissolved oxygen (DO). The strong dependency of the ratio between NEP and calcification on calcite saturation can be used to develop a suitable parameterization to account for calcification in lake carbon budgets. |
| Databáze: | OpenAIRE |
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