气候变化领域集成服务门户(CCPortal): High-Frequency Variability of Small-Particle Carbon Export Flux in the Northeast Atlantic

CCPortal

DOI	10.1029/2018GB005963
	High-Frequency Variability of Small-Particle Carbon Export Flux in the Northeast Atlantic
	Bol R.; Henson S.A.; Rumyantseva A.; Briggs N.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1803
结束页码	1814
卷号	32 期号:12
英文摘要	The biological carbon pump exports carbon fixed by photosynthesis out of the surface ocean and transfers it to the deep, mostly in the form of sinking particles. Despite the importance of the pump in regulating the air-sea CO 2 balance, the magnitude of global carbon export remains unclear, as do its controlling mechanisms. A possible sinking flux of carbon to the mesopelagic zone may be via the mixed-layer pump: a seasonal net detrainment of particulate organic carbon (POC)-rich surface waters, caused by sequential deepening and shoaling of the mixed layer. In this study, we present a full year of daily small-particle POC concentrations derived from glider optical backscatter data, to study export variability at the Porcupine Abyssal Plain (PAP) sustained observatory in the Northeast Atlantic. We observe a strong seasonality in small-particle transfer efficiency, with a maximum in winter and early spring. By calculating daily POC export driven by mixed-layer variations, we find that the mixed-layer pump supplies an annual flux of at least 3.0 ± 0.9 g POC·m −2 ·year −1 to the mesopelagic zone, contributing between 5% and 25% of the total annual export flux and likely contributing to closing a gap in the mesopelagic carbon budget found by other studies. These are, to our best knowledge, the first high-frequency observations of export variability over the course of a full year. Our results support the deployment of bio-optical sensors on gliders to improve our understanding of the ocean carbon cycle on temporal scales from daily to annual. ©2018. The Authors.
英文关键词	carbon export; gliders; mixed-layer pump; optical backscatter; transfer efficiency
语种	英语
scopus关键词	air-sea interaction; backscatter; biological pump; carbon balance; carbon fixation; carbon flux; carbon sink; frequency analysis; instrumentation; mesopelagic zone; mixed layer; particulate organic carbon; photosynthesis; transfer function; Atlantic Ocean; Atlantic Ocean (Northeast); Porcupine Abyssal Plain
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/129767
作者单位	School of Ocean and Earth Sciences, University of Southampton, Southampton, United Kingdom; Now at NIOZ Royal Netherlands Institute for Sea Research, Texel, Netherlands; Now at Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; National Oceanography Centre, Southampton, United Kingdom
推荐引用方式 GB/T 7714	Bol R.,Henson S.A.,Rumyantseva A.,et al. High-Frequency Variability of Small-Particle Carbon Export Flux in the Northeast Atlantic[J],2018,32(12).
APA	Bol R.,Henson S.A.,Rumyantseva A.,&Briggs N..(2018).High-Frequency Variability of Small-Particle Carbon Export Flux in the Northeast Atlantic.Global Biogeochemical Cycles,32(12).
MLA	Bol R.,et al."High-Frequency Variability of Small-Particle Carbon Export Flux in the Northeast Atlantic".Global Biogeochemical Cycles 32.12(2018).