Review on the Role of Terrestrial Aquatic Photosynthesis in the Global Carbon Cycle
| Autor: | Zaihua Liu |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Total organic carbon
DIC fertilization Ecology Aquatic ecosystem Global warming Carbon fixation Atmospheric carbon cycle Earth and Planetary Sciences(all) Carbon sink Rock weathering General Medicine Water-rock- gas-organism interaction Terrestrial aquatic photosynthesis Carbon cycle Global carbon cycle Environmental chemistry Dissolved organic carbon Environmental science Autochthonous organic carbon burial |
| Zdroj: | Procedia Earth and Planetary Science. 7:513-516 |
| ISSN: | 1878-5220 |
| DOI: | 10.1016/j.proeps.2013.03.003 |
| Popis: | Approximately 50% of the photosynthesis on Earth each year occurs in aquatic environments. Therefore, aquatic carbon fixation is particularly relevant in the regulation of the global climate. However, previous work concentrated mainly on the role of ocean aquatic photosynthesis in the uptake of CO 2 and/or HCO − . Here, it is shown that the role of terrestrial aquatic photosynthesis in the CO 2 uptake, which utilizes dissolved inorganic carbon (DIC) by rock weathering to form the autochthonous organic carbon, and thus decreases the CO 2 release to atmosphere from terrestrial aquatic systems, should not be neglected in global budgeting in the carbon cycle. The magnitude of this carbon sink may account for a few hundred million tons of carbon per year, and might increase with the rise in DIC caused by global warming and anthropogenic activities. The finding that terrestrial aquatic photosynthesis results in the storage of significant amounts of DIC (CO 2 ) has broad implications. It indicates that the rock weathering-related carbon sink is largely underestimated if only the DIC concentrations at river mouths are considered, and transformation of DIC to autochthonous TOC is neglected. It also indicates that the atmospheric CO 2 sink due to carbonate weathering might be significant in also controlling long-term climate changes, due to the substantial production and burial of autochthonous organic carbon. This challenges the traditional point of view that only the chemical weathering of Ca–silicate rocks might potentially control long-term climate change. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|