Carbonate chemistry of an in-situ free-ocean CO2 enrichment experiment (antFOCE) in comparison to short term variation in Antarctic coastal waters
| Autor: | Glenn Johnstone, E. D. van Ooijen, Nicholas P. Roden, James Black, K. Berry, Mark Milnes, Steven Whiteside, Donna Roberts, Edward T. Peltzer, Jonathan S. Stark, William Kirkwood, K. Newbery, Scott C. Stark, Bronte Tilbrook |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
In situ Multidisciplinary 010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology Science Atmospheric sciences 01 natural sciences Salinity chemistry.chemical_compound chemistry Benthic zone Carbonate Medicine Marine ecosystem Diel vertical migration 0105 earth and related environmental sciences |
| Zdroj: | Scientific Reports, Vol 8, Iss 1, Pp 1-16 (2018) |
| ISSN: | 2045-2322 |
| Popis: | Free-ocean CO2 enrichment (FOCE) experiments have been deployed in marine ecosystems to manipulate carbonate system conditions to those predicted in future oceans. We investigated whether the pH/carbonate chemistry of extremely cold polar waters can be manipulated in an ecologically relevant way, to represent conditions under future atmospheric CO2 levels, in an in-situ FOCE experiment in Antarctica. We examined spatial and temporal variation in local ambient carbonate chemistry at hourly intervals at two sites between December and February and compared these with experimental conditions. We successfully maintained a mean pH offset in acidified benthic chambers of −0.38 (±0.07) from ambient for approximately 8 weeks. Local diel and seasonal fluctuations in ambient pH were duplicated in the FOCE system. Large temporal variability in acidified chambers resulted from system stoppages. The mean pH, Ωarag and fCO2 values in the acidified chambers were 7.688 ± 0.079, 0.62 ± 0.13 and 912 ± 150 µatm, respectively. Variation in ambient pH appeared to be mainly driven by salinity and biological production and ranged from 8.019 to 8.192 with significant spatio-temporal variation. This experiment demonstrates the utility of FOCE systems to create conditions expected in future oceans that represent ecologically relevant variation, even under polar conditions. |
| Databáze: | OpenAIRE |
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