气候变化领域集成服务门户(CCPortal): A Detailed View on the Seasonality of Stable Carbon Isotopes Across the North Atlantic

CCPortal

DOI	10.1029/2018GB005905
	A Detailed View on the Seasonality of Stable Carbon Isotopes Across the North Atlantic
	Becker M.; Steinhoff T.; Körtzinger A.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1406
结束页码	1419
卷号	32 期号:9
英文摘要	The North Atlantic Ocean plays a major role in climate change not the least due to its importance in CO2 uptake and thus natural carbon sequestration. The CO2 concentration in its surface waters, which determines the ocean's CO2 sink/source function, varies on seasonal and interannual time scales and is mainly driven by air-sea gas exchange, temperature variability, and biological production/respiration. The variability in stable carbon isotope signatures can provide further insight and help to improve the understanding of the controls of the surface ocean carbon system. In this work, a cavity ringdown spectrometer was coupled to a classical, equilibrator-based pCO2 system on a voluntary observing ship line that regularly sails across the subpolar North Atlantic between North America and Europe. From 2012 to 2014, a 3-year time series of underway surface δ13C(CO2) data was obtained along with continuous measurements of temperature, salinity, and fCO2. We perform a decomposition of thermal and nonthermal drivers of fCO2 and δ13C(CO2). The direct measurement of the surface ocean δ13C(CO2) allows us to estimate the mass flux and also the stable carbon isotope fractionation during air-sea gas exchange. While the CO2 mass flow was in the range of 1–2 mol CO2·m−2·year−1 on the shelves and 2.5–3.5 mol CO2·m−2·year−1 in the open ocean, the isotope signature of this CO2 flux with respect to the sea surface ranged from −2.6 ± 1.4‰ on the shelves to −6.6 ± 0.9‰ in the western and −4.5 ± 0.9‰ in the eastern part of the open ocean section. ©2018. The Authors.
英文关键词	air-sea gas exchange; carbon dioxide; cavity ringdown spectroscopy; North Atlantic Ocean; seasonal variability; stable carbon isotopes
语种	英语
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/129793
作者单位	Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; GEOMAR Helmholtz Centre for Ocean Research Kiel, Chemical Oceanography, Kiel, Germany; Christian Albrecht University, Sektion Chemie, Kiel, Germany
推荐引用方式 GB/T 7714	Becker M.,Steinhoff T.,Körtzinger A.. A Detailed View on the Seasonality of Stable Carbon Isotopes Across the North Atlantic[J],2018,32(9).
APA	Becker M.,Steinhoff T.,&Körtzinger A..(2018).A Detailed View on the Seasonality of Stable Carbon Isotopes Across the North Atlantic.Global Biogeochemical Cycles,32(9).
MLA	Becker M.,et al."A Detailed View on the Seasonality of Stable Carbon Isotopes Across the North Atlantic".Global Biogeochemical Cycles 32.9(2018).