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Anthropogenic Perturbations to the Atmospheric Molybdenum Cycle
Title: Anthropogenic Perturbations to the Atmospheric Molybdenum Cycle
Authors: Wong, Michelle Y.Rathod, Sagar D.Marino, RoxanneLi, LongleiHowarth, Robert W.Alastuey, AndrésAlaimo, Maria GraziaBarraza, FranciscoCarneiro, Manuel CastroChellam, ShankararamanChen, Yu-ChengCohen, David D.Connelly, DavidDongarra, GaetanoGómez, DaríoHand, Jenny L.Harrison, Roy M.Hopke, Philip K.Hueglin, ChristophKuang, Yuan-WenLambert, FabriceLiang, JamesLosno, RemiMaenhaut, WillyMilando, ChadMonteiro, Maria Inês CoutoMorera-Gómez, YasserQuerol, XavierRodríguez González, Sergio ORCID RESEARCHERID Autor AEMETSmichowski, PatriciaVarrica, DanielaXiao, Yi-huaXu, YangjunjieMahowald, Natalie M.
Keywords: Particulate matter; Nitrogen fixation; Nitrogenase; Nutrient limitation; Aerosol deposition
Issue Date: 2021
Publisher: Wiley; American Geophysical Union
Citation: Global Biogeochemical Cycles. 2021, 35(2), e2020GB006787
Publisher version:
Abstract: Molybdenum (Mo) is a key cofactor in enzymes used for nitrogen (N) fixation and nitrate reduction, and the low availability of Mo can constrain N inputs, affecting ecosystem productivity. Natural atmospheric Mo aerosolization and deposition from sources such as desert dust, sea‐salt spray, and volcanoes can affect ecosystem function across long timescales, but anthropogenic activities such as combustion, motor vehicles, and agricultural dust have accelerated the natural Mo cycle. Here we combined a synthesis of global atmospheric concentration observations and modeling to identify and estimate anthropogenic sources of atmospheric Mo. To project the impact of atmospheric Mo on terrestrial ecosystems, we synthesized soil Mo data and estimated the global distribution of soil Mo using two approaches to calculate turnover times. We estimated global emissions of atmospheric Mo in aerosols (<10 μm in diameter) to be 23 Gg Mo yr‐1, with 40 to 75% from anthropogenic sources. We approximated that for the top meter of soil, Mo turnover times range between 1,000 to 1,000,000 years. In some industrialized regions, anthropogenic inputs have enhanced Mo deposition 100‐fold, lowering the soil Mo turnover time considerably. Our synthesis of global observational data, modeling, and a mass balance comparison with riverine Mo exports suggest that anthropogenic activity has greatly accelerated the Mo cycle, with potential to influence N‐limited ecosystems.
ISSN: 0886-6236
Appears in Collections:Artículos científicos 2019-2022

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