DOI: 10.1029/2019GB006223
论文题名: Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death
作者: Oakes R.L. ; Peck V.L. ; Manno C. ; Bralower T.J.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 6 语种: 英语
英文关键词: aragonite
; biogeochemistry
; carbonate system
; degradation
; dissolution
; fossil record
; gastropod
; organic matter
; shell
; taphonomy
; Pteropoda
学科: aragonite
; carbonate chemistry
; decay
; dissolution
; pteropods
; taphonomy
中文摘要: 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 the aragonite saturation state of seawater. Three to four days after death, shells became milky white and nano scanning 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. ©2019. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160122
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, Pennsylvania State University, University Park, PA, United States; Academy of Natural Sciences of Drexel University, Philadelphia, PA, United States; British Antarctic Survey, Cambridge, United Kingdom
Recommended Citation:
Oakes R.L.,Peck V.L.,Manno C.,et al. Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death[J]. Global Biogeochemical Cycles,2019-01-01,33(6)