气候变化领域集成服务门户(CCPortal): Evolution of a Subducted Carbon-Rich Filament on the Edge of the North Atlantic Gyre

CCPortal

DOI	10.1029/2020JC016685
	Evolution of a Subducted Carbon-Rich Filament on the Edge of the North Atlantic Gyre
	Johnson A.R.; Omand M.M.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	The oceanic biological carbon pump encompasses a variety of mechanisms by which CO2, fixed into organic form by phytoplankton, is transported from the sunlit surface layers to the interior ocean. Here, we investigate submesoscale and mixed layer subduction, estimated to represent ∼20% of global particulate organic carbon (POC) export. Seven Biogeochemical (BGC) Argo profiling floats were analyzed for evidence of subduction of POC in the North Atlantic Ocean, revealing a pattern in the seasonality. Although vertical processes that give rise to subduction are enhanced during late winter and spring, the bio-optical evidence for intrusions—namely a deep local maxima in POC, co-located with a temperature and salinity anomaly—were more commonly observed in the summer. We hypothesize that these deep intrusions can be long-lived, having been subducted months earlier and persisting at depth throughout the warm season. We present a case study of a notable anomaly, observed in 10 consecutive BGC Argo profiles on the northeastern edge of the subtropical gyre. Analysis of the profiles, complemented by remote sensing and HYCOM model output, provides insight into the history and subsequent fate of the subducted water. © 2021. The Authors.
英文关键词	Biogeochemical Argo; North Atlantic spring bloom; particulate organic carbon; physical subduction; sequestration
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/186483
作者单位	Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, United States
推荐引用方式 GB/T 7714	Johnson A.R.,Omand M.M.. Evolution of a Subducted Carbon-Rich Filament on the Edge of the North Atlantic Gyre[J],2021,126(2).
APA	Johnson A.R.,&Omand M.M..(2021).Evolution of a Subducted Carbon-Rich Filament on the Edge of the North Atlantic Gyre.Journal of Geophysical Research: Oceans,126(2).
MLA	Johnson A.R.,et al."Evolution of a Subducted Carbon-Rich Filament on the Edge of the North Atlantic Gyre".Journal of Geophysical Research: Oceans 126.2(2021).