globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005106
Scopus记录号: 2-s2.0-84941876663
论文题名:
Global oceanic emission of ammonia: Constraints from seawater and atmospheric observations
作者: Paulot F; , Jacob D; J; , Johnson M; T; , Bell T; G; , Baker A; R; , Keene W; C; , Lima I; D; , Doney S; C; , Stock C; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期:8
起始页码: 1165
结束页码: 1178
语种: 英语
英文关键词: ammonia ; natural ; nitrogen ; ocean
Scopus关键词: ammonia ; biogeochemical cycle ; emission inventory ; global change ; nitrification ; nitrogen ; Northern Hemisphere ; plankton ; remineralization ; seawater ; Pacific Ocean ; Pacific Ocean (Equatorial)
英文摘要: Current global inventories of ammonia emissions identify the ocean as the largest natural source. This source depends on seawater pH, temperature, and the concentration of total seawater ammonia (NHx(sw)), which reflects a balance between remineralization of organic matter, uptake by plankton, and nitrification. Here we compare [NHx(sw)] from two global ocean biogeochemical models (BEC and COBALT) against extensive ocean observations. Simulated [NHx(sw)] are generally biased high. Improved simulation can be achieved in COBALT by increasing the plankton affinity for NHx within observed ranges. The resulting global ocean emissions is 2.5 TgN a-1, much lower than current literature values (7-23 TgN a-1), including the widely used Global Emissions InitiAtive (GEIA) inventory (8 TgN a-1). Such a weak ocean source implies that continental sources contribute more than half of atmospheric NHx over most of the ocean in the Northern Hemisphere. Ammonia emitted from oceanic sources is insufficient to neutralize sulfate aerosol acidity, consistent with observations. There is evidence over the Equatorial Pacific for a missing source of atmospheric ammonia that could be due to photolysis of marine organic nitrogen at the ocean surface or in the atmosphere. Accommodating this possible missing source yields a global ocean emission of ammonia in the range 2-5 TgN a-1, comparable in magnitude to other natural sources from open fires and soils. ©2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77944
Appears in Collections:气候变化事实与影响

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作者单位: Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Centre for Ocean and Atmospheric Science, University of East Anglia, Norwich, United Kingdom; Center for Environment, Fisheries, and Aquaculture Science, Lowestoft, United Kingdom; Plymouth Marine Laboratory, Plymouth, United Kingdom; School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States

Recommended Citation:
Paulot F,, Jacob D,J,et al. Global oceanic emission of ammonia: Constraints from seawater and atmospheric observations[J]. Global Biogeochemical Cycles,2015-01-01,29(8)
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