nerc.ac.uk

Degradation of internal organic matter is the main control on pteropod shell dissolution after death

Oakes, R.L.; Peck, V.L. ORCID: https://orcid.org/0000-0002-7948-6853; Manno, C. ORCID: https://orcid.org/0000-0002-3337-6173; Bralower, T.J.. 2019 Degradation of internal organic matter is the main control on pteropod shell dissolution after death. Global Biogeochemical Cycles, 33. 749-760. 10.1029/2019GB006223

Before downloading, please read NORA policies.
[thumbnail of Oakes_et_al-2019-Global_Biogeochemical_Cycles.pdf]
Preview
Text
© 2019. American Geophysical Union. All Rights Reserved.
Oakes_et_al-2019-Global_Biogeochemical_Cycles.pdf - Published Version

Download (1MB) | Preview

Abstract/Summary

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 three to thirteen days, the oxidation of organic matter within the shells of dead pteropods is a stronger driver of shell dissolution than the saturation state of seawater. Three to four days after death, shells became milky white and nano‐SEM 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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2019GB006223
ISSN: 0886-6236
Additional Keywords: pteropods; carbonate chemistry; aragonite; decay; taphonomy; dissolution
Date made live: 14 May 2019 13:16 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/523332

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...