期刊
PALEOCEANOGRAPHY
卷 29, 期 5, 页码 357-369出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014PA002621
关键词
-
资金
- US National Science Foundation [OCE-0903014, OCE09-02869, OCE12-20602, OCE12-20554]
- Directorate For Geosciences [1220615] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1220554, 1220602] Funding Source: National Science Foundation
- Division Of Ocean Sciences [1220615] Funding Source: National Science Foundation
The Paleocene-Eocene Thermal Maximum (PETM) has been associated with the release of several thousands of petagrams of carbon (Pg C) as methane and/or carbon dioxide into the ocean-atmosphere system within similar to 10 kyr, on the basis of the co-occurrence of a carbon isotope excursion (CIE), widespread dissolution of deep sea carbonates, and global warming. In theory, this rapid carbon release should have severely acidified the surface ocean, though no geochemical evidence has yet been presented. Using boron-based proxies for surface ocean carbonate chemistry, we present the first observational evidence for a drop in the pH of surface and thermocline seawater during the PETM. Planktic foraminifers from a drill site in the North Pacific (Ocean Drilling Program Site 1209) show a similar to 0.8% decrease in boron isotopic composition (delta B-11) at the onset of the event, along with a 30-40% reduction in shell B/Ca. Similar trends in delta B-11 are present in two lower-resolution records from the South Atlantic and Equatorial Pacific. These observations are consistent with significant, global acidification of the surface ocean lasting at least 70 kyr and requiring sustained carbon release. The anomalies in the B records are consistent with an initial surface pH drop of similar to 0.3 units, at the upper range of model-based estimates of acidification.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据