气候变化领域集成服务门户(CCPortal): Marine N2O emissions during a Younger Dryas-like event: The role of meridional overturning, tropical thermocline ventilation, and biological productivity

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DOI	10.1088/1748-9326/ab2353
	Marine N2O emissions during a Younger Dryas-like event: The role of meridional overturning, tropical thermocline ventilation, and biological productivity
	Joos F.; Battaglia G.; Fischer H.; Jeltsch-Thömmes A.; Schmitt J.
发表日期	2019
ISSN	17489318
卷号	14 期号:7
英文摘要	Past variations in atmospheric nitrous oxide (N2O) allow important insight into abrupt climate events. Here, we investigate marine N2O emissions by forcing the Bern3D Earth System Model of Intermediate Complexity with freshwater into the North Atlantic. The model simulates a decrease in marine N2O emissions of about 0.8 TgN yr-1 followed by a recovery, in reasonable agreement regarding timing and magnitude with isotope-based reconstructions of marine emissions for the Younger Dryas Northern Hemisphere cold event. In the model the freshwater forcing causes a transient near-collapse of the Atlantic Meridional Overturning Circulation (AMOC) leading to a fast adjustment in thermocline ventilation and an increase in O2 in tropical eastern boundary systems and in the tropical Indian Ocean. In turn, net production by nitrification and denitrification and N2O emissions decrease in these regions. The decrease in organic matter export, mainly in the North Atlantic where ventilation and nutrient supply is suppressed, explains the remaining emission reduction. Modeled global marine N2O production and emission changes are delayed, initially by up to 300 years, relative to the AMOC decrease, but by less than 50 years at peak decline. The N2O perturbation is recovering only slowly and the lag between the recovery in AMOC and the recovery in N2O emissions and atmospheric concentrations exceeds 400 years. Thus, our results suggest a century-scale lag between ocean circulation and marine N2O emissions, and a tight coupling between changes in AMOC and tropical thermocline ventilation. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	freshwater hosing experiment; marine nitrous oxide emissions; Nitrous oxide; Younger Dryas
语种	英语
scopus关键词	Atmospheric chemistry; Emission control; Nitrogen oxides; Recovery; Stream flow; Tropics; Ventilation; Water; Atlantic meridional overturning circulations; Atmospheric concentration; Atmospheric nitrous oxide; Earth system model of intermediate complexity; Nitrification and denitrification; Nitrous oxide; Nitrous oxide emissions; Younger Dryas; Oceanography
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154508
作者单位	Climate and Environmental Physics, Physics Institute, University of Bern, Bern, 3012, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland
推荐引用方式 GB/T 7714	Joos F.,Battaglia G.,Fischer H.,et al. Marine N2O emissions during a Younger Dryas-like event: The role of meridional overturning, tropical thermocline ventilation, and biological productivity[J],2019,14(7).
APA	Joos F.,Battaglia G.,Fischer H.,Jeltsch-Thömmes A.,&Schmitt J..(2019).Marine N2O emissions during a Younger Dryas-like event: The role of meridional overturning, tropical thermocline ventilation, and biological productivity.Environmental Research Letters,14(7).
MLA	Joos F.,et al."Marine N2O emissions during a Younger Dryas-like event: The role of meridional overturning, tropical thermocline ventilation, and biological productivity".Environmental Research Letters 14.7(2019).