Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans
© Author(s) 2017. This is an Open Access article distributed under the Creative Commons Attribution License CC BY 3.0 ( https://creativecommons.org/licenses/by/3.0/ ). Published by Copernicus Publications on behalf of the European Geosciences Union. Anthropogenic nitrogen (N) emissions to the atmosp...
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ftunivhertford:oai:uhra.herts.ac.uk:2299/19479 2024-05-19T07:45:26+00:00 Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans Rohekar, Shital Shirsat School of Physics, Astronomy and Mathematics 2017-07-05 22 10814532 http://hdl.handle.net/2299/19479 eng eng Atmospheric Chemistry and Physics Rohekar , S S 2017 , ' Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans ' , Atmospheric Chemistry and Physics , vol. 17 , pp. 8189-8210 . https://doi.org/10.5194/acp-17-8189-2017 1680-7316 http://hdl.handle.net/2299/19479 2017 ftunivhertford https://doi.org/10.5194/acp-17-8189-2017 2024-04-30T23:36:08Z © Author(s) 2017. This is an Open Access article distributed under the Creative Commons Attribution License CC BY 3.0 ( https://creativecommons.org/licenses/by/3.0/ ). Published by Copernicus Publications on behalf of the European Geosciences Union. Anthropogenic nitrogen (N) emissions to the atmosphere have increased significantly the deposition of nitrate (NO3−) and ammonium (NH4+) to the surface waters of the open ocean, with potential impacts on marine productivity and the global carbon cycle. Global-scale understanding of the impacts of N deposition to the oceans is reliant on our ability to produce and validate models of nitrogen emission, atmospheric chemistry, transport and deposition. In this work, ∼ 2900 observations of aerosol NO3− and NH4+ concentrations, acquired from sampling aboard ships in the period 1995–2012, are used to assess the performance of modelled N concentration and deposition fields over the remote ocean. Three ocean regions (the eastern tropical North Atlantic, the northern Indian Ocean and northwest Pacific) were selected, in which the density and distribution of observational data were considered sufficient to provide effective comparison to model products. All of these study regions are affected by transport and deposition of mineral dust, which alters the deposition of N, due to uptake of nitrogen oxides (NOx) on mineral surfaces. Assessment of the impacts of atmospheric N deposition on the ocean requires atmospheric chemical transport models to report deposition fluxes; however, these fluxes cannot be measured over the ocean. Modelling studies such as the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), which only report deposition flux, are therefore very difficult to validate for dry deposition. Here, the available observational data were averaged over a 5° × 5° grid and compared to ACCMIP dry deposition fluxes (ModDep) of oxidised N (NOy) and reduced N (NHx) and to the following parameters from the Tracer Model 4 of the Environmental Chemical ... Other/Unknown Material North Atlantic University of Hertfordshire: UH Research Archive Atmospheric Chemistry and Physics 17 13 8189 8210 |
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English |
description |
© Author(s) 2017. This is an Open Access article distributed under the Creative Commons Attribution License CC BY 3.0 ( https://creativecommons.org/licenses/by/3.0/ ). Published by Copernicus Publications on behalf of the European Geosciences Union. Anthropogenic nitrogen (N) emissions to the atmosphere have increased significantly the deposition of nitrate (NO3−) and ammonium (NH4+) to the surface waters of the open ocean, with potential impacts on marine productivity and the global carbon cycle. Global-scale understanding of the impacts of N deposition to the oceans is reliant on our ability to produce and validate models of nitrogen emission, atmospheric chemistry, transport and deposition. In this work, ∼ 2900 observations of aerosol NO3− and NH4+ concentrations, acquired from sampling aboard ships in the period 1995–2012, are used to assess the performance of modelled N concentration and deposition fields over the remote ocean. Three ocean regions (the eastern tropical North Atlantic, the northern Indian Ocean and northwest Pacific) were selected, in which the density and distribution of observational data were considered sufficient to provide effective comparison to model products. All of these study regions are affected by transport and deposition of mineral dust, which alters the deposition of N, due to uptake of nitrogen oxides (NOx) on mineral surfaces. Assessment of the impacts of atmospheric N deposition on the ocean requires atmospheric chemical transport models to report deposition fluxes; however, these fluxes cannot be measured over the ocean. Modelling studies such as the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP), which only report deposition flux, are therefore very difficult to validate for dry deposition. Here, the available observational data were averaged over a 5° × 5° grid and compared to ACCMIP dry deposition fluxes (ModDep) of oxidised N (NOy) and reduced N (NHx) and to the following parameters from the Tracer Model 4 of the Environmental Chemical ... |
author2 |
School of Physics, Astronomy and Mathematics |
author |
Rohekar, Shital Shirsat |
spellingShingle |
Rohekar, Shital Shirsat Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
author_facet |
Rohekar, Shital Shirsat |
author_sort |
Rohekar, Shital Shirsat |
title |
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
title_short |
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
title_full |
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
title_fullStr |
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
title_full_unstemmed |
Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans |
title_sort |
observation- and model-based estimates of particulate dry nitrogen deposition to the oceans |
publishDate |
2017 |
url |
http://hdl.handle.net/2299/19479 |
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North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Atmospheric Chemistry and Physics Rohekar , S S 2017 , ' Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans ' , Atmospheric Chemistry and Physics , vol. 17 , pp. 8189-8210 . https://doi.org/10.5194/acp-17-8189-2017 1680-7316 http://hdl.handle.net/2299/19479 |
op_doi |
https://doi.org/10.5194/acp-17-8189-2017 |
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Atmospheric Chemistry and Physics |
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17 |
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13 |
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8210 |
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