气候变化领域集成服务门户(CCPortal): Transient Enhancement and Decoupling of Carbon and Opal Export in Cyclonic Eddies

CCPortal

DOI	10.1029/2020JC016372
	Transient Enhancement and Decoupling of Carbon and Opal Export in Cyclonic Eddies
	Zhou K.; Dai M.; Xiu P.; Wang L.; Hu J.; Benitez-Nelson C.R.
发表日期	2020
ISSN	21699275
卷号	125 期号:9
英文摘要	Given their ephemeral nature, eddies have proven difficult to study, with contrary results from field observations that typically sample at the center during a specific stage of an eddy lifespan. Using the natural occurring radionuclide 234Th, we examined particle fluxes within two cyclonic eddies (CEs) at different evolutionary stages (mature stage eddy, C2, and a decay stage eddy, C1) in the oligotrophic western South China Sea (SCS). Using a 1-D steady state model, 234Th derived particulate organic carbon (POC) and opal fluxes at 100 m were determined. Both POC and opal fluxes were significantly higher at the eddy edges relative to the eddy cores, with integrated eddy POC and opal fluxes of 6.2 (2.1) mmol C m−2 day−1 and 1.5 (0.28) mmol Si m−2 day−1 in C2 (C1). When compared to non-eddy regimes, both POC (by 2.6-fold) and opal fluxes (by 7.5-fold) in C2 were enhanced; they were reduced and decoupled (0.9-fold and 1.4-fold) in C1. The difference in enhancement of particle fluxes and the coupling/decoupling between POC and opal flux likely reflects changes in phytoplankton community structures resulting from eddy evolution. Scaling these results to the entire SCS basin suggests that CEs contribute <4% of the net POC flux but >15% of the opal flux. Therefore, CEs may regulate the biogeochemical cycling of silica to a much greater extent than carbon in the ocean. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	234Th; cyclonic eddies; opal; particle flux; particulate organic carbon; South China Sea
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186684
作者单位	State Key Laboratory of Marine Environmental Science & College of Ocean and Earth Science, Xiamen University, Xiamen, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Guangzhou, China; School of the Earth, Ocean, and Environment, University of South Carolina, Columbia, SC, United States
推荐引用方式 GB/T 7714	Zhou K.,Dai M.,Xiu P.,et al. Transient Enhancement and Decoupling of Carbon and Opal Export in Cyclonic Eddies[J],2020,125(9).
APA	Zhou K.,Dai M.,Xiu P.,Wang L.,Hu J.,&Benitez-Nelson C.R..(2020).Transient Enhancement and Decoupling of Carbon and Opal Export in Cyclonic Eddies.Journal of Geophysical Research: Oceans,125(9).
MLA	Zhou K.,et al."Transient Enhancement and Decoupling of Carbon and Opal Export in Cyclonic Eddies".Journal of Geophysical Research: Oceans 125.9(2020).