Atmospheric Deposition of Reactive Nitrogen Derived from Global Model Simulations and from Satellite Observations

Abstract : Reactive nitrogen is a key nutrient and its availability in the environment, together with other nutrients’ availability, is controlling ecosystem productivity. The latter is linked to carbon dioxide removal from the atmosphere by the marine and terrestrial ecosystems and to food production. Atmospheric deposition of reactive nitrogen compounds has positive and negative impacts to ecosystems leading to fertilization or acidification and accumulation of excess nutrients, respectively. Several areas of the globe are estimated to be subject to high fluxes of deposited reactive nitrogen. However, model estimates are associated with high uncertainties. The present study aims to reduce these uncertainties and increase the robustness of nitrogen atmospheric deposition flux estimates. Knowledge on the global present-day atmospheric deposition fluxes of reactive nitrogen is here summarized, accounting both for the oxygenated and reduced species as well as for the organic fraction of reactive nitrogen that has been, until recently, neglected. The global 3-dimensional atmospheric chemistry transport model TM4-ECPL that accounts for multiphase chemistry, all major aerosol components and a very comprehensive atmospheric nitrogen cycle including organic nitrogen (Kanakidou et al., 2016) is here used in conjunction with satellite observations. The meteorology in this off-line model is taken from European Centre for Medium-Range Weather Forecasts ERA-interim reanalysis products. The simulated nitrogen deposition fluxes have been successfully evaluated against surface observations. For the present study, satellite observations of NO2 and NH3 from the GOME-2, TROPOMI and IASI instruments are further used to evaluate model results. Atmospheric deposition fluxes derived from the satellite observations are compared with the simulated fluxes. Regions where significant improvements are achieved by reconciling model results and satellite observations are highlighted. The implications of the findings for the marine ecosystem functioning (Kanakidou et al., 2018) are discussed and put in perspective based on recent ocean biogeochemical modeling of the response of the oceans with regard to carbon sequestration and nitrous oxide emissions to the atmospheric inputs of nitrogen (Jickells et al., 2017). Kanakidou M., et al, Past, Present and Future Atmospheric Nitrogen Deposition, Journal of the Atmospheric Sciences (JAS-D-15-0278) 73, 2039-2047, 2016. Kanakidou M., et al., Aerosols in atmospheric chemistry and biogeochemical cycles of nutrients, Environ. Res. Lett. 13, 063004, doi.org/10.1088/1748-9326/aabcdb , 2018. Jickells, T. D., et al., A reevaluation of the magnitude and impacts of anthropogenic atmospheric nitrogen inputs on the ocean, Global Biogeochem. Cycles, 31, doi:10.1002/2016GB005586, 2017.
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Poster communications
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Submitted on : Friday, August 9, 2019 - 6:48:55 PM
Last modification on : Sunday, August 11, 2019 - 1:09:32 AM

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  • HAL Id : insu-02265497, version 1

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Maria Kanakidou, Nikos Daskalakis, Andreas Hilboll, Andreas Richter, Stelios Myriokefalitakis, et al.. Atmospheric Deposition of Reactive Nitrogen Derived from Global Model Simulations and from Satellite Observations. Living Planet Symposium 2019, May 2019, Milan, Italy. ⟨insu-02265497⟩

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