期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 24, 页码 9001-9008出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062501
关键词
ocean acidification; climate change; coral calcification; El Nino-Southern Oscillation
资金
- NOAA
Anthropogenic CO2 is causing warming and ocean acidification. Coral reefs are being severely impacted, yet confusion lingers regarding how reefs will respond to these stressors over this century. Since the 1982-1983 El Nino-Southern Oscillation warming event, the persistence of reefs around the Galapagos Islands has differed across an acidification gradient. Reefs disappeared where pH<8.0 and aragonite saturation state ((arag))3 and have not recovered, whereas one reef has persisted where pH>8.0 and (arag)>3. Where upwelling is greatest, calcification by massive Porites is higher than predicted by a published relationship with temperature despite high CO2, possibly due to elevated nutrients. However, skeletal P/Ca, a proxy for phosphate exposure, negatively correlates with density (R=-0.822, p<0.0001). We propose that elevated nutrients have the potential to exacerbate acidification by depressing coral skeletal densities and further increasing bioerosion already accelerated by low pH.
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