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Journal Articles Global Biogeochemical Cycles Year : 2021

Anthropogenic Perturbations to the Atmospheric Molybdenum Cycle

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Michelle Y. Wong
  • Function : Author
Sagar D. Rathod
  • Function : Author
Roxanne Marino
  • Function : Author
Longlei Li
  • Function : Author
Robert W. Howarth
  • Function : Author
Andres Alastuey
  • Function : Author
Maria Grazia Alaimo
  • Function : Author
Francisco Barraza
  • Function : Author
Manuel Castro Carneiro
  • Function : Author
Shankararaman Chellam
  • Function : Author
Yu-Cheng Chen
  • Function : Author
David D. Cohen
  • Function : Author
David Connelly
  • Function : Author
Gaetano Dongarra
  • Function : Author
Darió Gómez
  • Function : Author
Jenny Hand
  • Function : Author
R. M. Harrison
  • Function : Author
Philip K. Hopke
  • Function : Author
Christoph Hueglin
  • Function : Author
Yuan-Wen Kuang
  • Function : Author
Fabrice Lambert
  • Function : Author
James Liang
  • Function : Author
Willy Maenhaut
  • Function : Author
Chad Milando
  • Function : Author
Maria Inês Couto Monteiro
  • Function : Author
Yasser Morera-Gómez
  • Function : Author
Xavier Querol
  • Function : Author
Sergio Rodríguez
  • Function : Author
Patricia Smichowski
  • Function : Author
Daniela Varrica
  • Function : Author
Yi-Hua Xiao
  • Function : Author
Natalie M. Mahowald
  • Function : Author

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%-75% from anthropogenic sources. We approximated that for the top meter of soil, Mo turnover times range between 1,000 and 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.
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insu-03590099 , version 1 (06-08-2022)

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Michelle Y. Wong, Sagar D. Rathod, Roxanne Marino, Longlei Li, Robert W. Howarth, et al.. Anthropogenic Perturbations to the Atmospheric Molybdenum Cycle. Global Biogeochemical Cycles, 2021, 35, p. 98-111. ⟨10.1029/2020GB006787⟩. ⟨insu-03590099⟩
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