气候变化领域集成服务门户(CCPortal): Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death

CCPortal

DOI	10.1029/2019GB006223
	Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death
	Oakes R.L.; Peck V.L.; Manno C.; Bralower T.J.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	749
结束页码	760
卷号	33 期号:6
英文摘要	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.
英文关键词	aragonite; carbonate chemistry; decay; dissolution; pteropods; taphonomy
语种	英语
scopus关键词	aragonite; biogeochemistry; carbonate system; degradation; dissolution; fossil record; gastropod; organic matter; shell; taphonomy; Pteropoda
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129727
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
推荐引用方式 GB/T 7714	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],2019,33(6).
APA	Oakes R.L.,Peck V.L.,Manno C.,&Bralower T.J..(2019).Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death.Global Biogeochemical Cycles,33(6).
MLA	Oakes R.L.,et al."Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death".Global Biogeochemical Cycles 33.6(2019).