气候变化领域集成服务门户(CCPortal): Ocean Ammonia Outgassing: Modulation by CO2 and Anthropogenic Nitrogen Deposition

CCPortal

DOI	10.1029/2019MS002026
	Ocean Ammonia Outgassing: Modulation by CO2 and Anthropogenic Nitrogen Deposition
	Paulot F.; Stock C.; John J.G.; Zadeh N.; Horowitz L.W.
发表日期	2020
ISSN	19422466
卷号	12 期号:10
英文摘要	The imprint of anthropogenic activities on the marine nitrogen (N) cycle remains challenging to represent in global models, in part because of uncertainties regarding the source of marine N to the atmosphere. While N inputs of terrestrial origin present a truly external perturbation, a significant fraction of N deposition over the ocean arises from oceanic ammonia (NH3) outgassing that is subsequently deposited in other ocean regions. Here, we describe advances in the Geophysical Fluid Dynamics Laboratory's (GFDL) Earth System Model 4 (ESM4.1) aimed at improving the representation of the exchange of N between atmosphere and ocean and its response to changes in ocean acidity and N deposition. We find that the simulated present-day NH3 outgassing (3.1 TgN yr−1) is 7% lower than under preindustrial conditions, which reflects the compensating effects of increasing CO2 (−16%) and N enrichment of ocean waters (+9%). This change is spatially heterogeneous, with decreases in the open ocean (−13%) and increases in coastal regions (+15%) dominated by coastal N enrichment. The ocean outgassing of ammonia is shown to increase the transport of N from N-rich to N-poor ocean regions, where carbon export at 100 m increases by 0.5%. The implications of the strong response of NH3 ocean outgassing to CO2 for the budget of NH3 in the remote marine atmosphere and its imprint in ice cores are discussed. © 2020. The Authors.
英文关键词	acidification; ammonia; Earth system; nitrogen cycle; nitrogen deposition
语种	英语
scopus关键词	Ammonia; Budget control; Carbon dioxide; Earth atmosphere; Nitrogen; Anthropogenic activity; Coastal regions; Earth system model; External perturbations; Geophysical fluid dynamics laboratories; Marine atmosphere; Nitrogen deposition; Pre-industrial conditions; Oceanography; acidity; air-water interaction; ammonia; anthropogenic effect; atmospheric deposition; carbon dioxide; climate modeling; human activity; nitrogen cycle; open ocean
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156606
作者单位	Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United States; Science Applications International Corporation (SAIC), Reston, VA, United States
推荐引用方式 GB/T 7714	Paulot F.,Stock C.,John J.G.,et al. Ocean Ammonia Outgassing: Modulation by CO2 and Anthropogenic Nitrogen Deposition[J],2020,12(10).
APA	Paulot F.,Stock C.,John J.G.,Zadeh N.,&Horowitz L.W..(2020).Ocean Ammonia Outgassing: Modulation by CO2 and Anthropogenic Nitrogen Deposition.Journal of Advances in Modeling Earth Systems,12(10).
MLA	Paulot F.,et al."Ocean Ammonia Outgassing: Modulation by CO2 and Anthropogenic Nitrogen Deposition".Journal of Advances in Modeling Earth Systems 12.10(2020).