期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 33, 期 6, 页码 749-760出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GB006223
关键词
pteropods; carbonate chemistry; aragonite; decay; taphonomy; dissolution
资金
- Ellis L. Yochelson Award
- Hiroshi and Koya Ohmoto Graduate Student Fellowship
- Alley Family Graduate Scholarship
- Deike Research Fellowship
- NERC [bas0100035, bas0100030] Funding Source: UKRI
The potential for preservation of thecosome pteropods is thought to be largely governed by the chemical stability of their delicate aragonitic shells in seawater. However, sediment trap studies have found that significant carbonate dissolution can occur above the carbonate saturation horizon. Here we present the results from experiments conducted on two cruises to the Scotia Sea to directly test whether the breakdown of the organic pteropod body influences shell dissolution. We find that on the timescales of 3 to 13 days, the oxidation of organic matter within the shells of dead pteropods is a stronger driver of shell dissolution than thearagonite saturation state of seawater. Three to four days after death, shells became milky white and nanoscanning electron microscope images reveal smoothing of internal surface features and increased shell porosity, both indicative of aragonite dissolution. These findings have implications for the interpretation of the condition of pteropod shells from sediment traps and the fossil record, as well as for understanding the processes controlling particulate carbonate export from the surface ocean.
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