Biogeochemistry

, Volume 35, Issue 1, pp 27–73

Atmospheric deposition of nutrients to the North Atlantic Basin

  • J. M. Prospero
  • K. Barrett
  • T. Church
  • F. Dentener
  • R. A. Duce
  • J. N. Galloway
  • H. LevyII
  • J. Moody
  • P. Quinn
Article

DOI: 10.1007/BF02179824

Cite this article as:
Prospero, J.M., Barrett, K., Church, T. et al. Biogeochemistry (1996) 35: 27. doi:10.1007/BF02179824

Abstract

Atmospheric chemical models are used to estimate the deposition rate of various inorganic oxides of nitrogen (NOy), reduced nitrogen species (NHx) and mineral dust to the North Atlantic Ocean (NAO). The estimated deposition of NOy to the NAO (excluding the coastal ocean) and the Caribbean is 360 × 109 Moles-N m−2 yr−1 (5.0 Tg N); this is equivalent to about 13% of the estimated global emission rate (natural and anthropogenic) and a quarter of the emission rate from sources in North America and Europe. In the case of NHx, 258 Moles-N m−2 yr−1 (3.6 Tg N) are deposited to the NAO and the Caribbean; this is about 6% of the global continental emissions. There is relatively little data on the deposition rate of organic nitrogen species; nonetheless, this evidence suggests that concentrations and deposition rates are comparable to those for inorganic nitrogen.

Because of anthropogenic emissions, the present-day deposition rate of NOy to the NAO is about five times greater than pre-industrial times largely due to emissions from energy production and biomass burning. The present-day emissions of NHx from continental anthropogenic sources are about four-to-five times greater than natural sources, mostly due to the impact of emissions from animal wastes associated with food production. Indeed, present-day emissions of NHx from animal waste are estimated to be about 10 times greater than the pre-human era. The deposition rate of mineral dust to the NAO is about 170 Tg yr−1; deposited with the dust (assuming average crustal abundances) is about 6 Tg yr−1 of Fe and 0.2 Tg yr−1 of P. Dust deposition in the NAO is almost completely attributable to transport from North African sources; a substantial fraction of the dust over the NAO is probably mobilized as a consequence of land use practices in arid regions and, consequently, it should be regarded as a pollutant.

Key words

dust deposition iron models NHx NOy nutrients 

Abbreviations

AEROCE

Atmosphere/Ocean Chemistry Experiment

AOT

aerosol optical thickness

EMEP

Cooperative Program for Monitoring and Evaluation of Long Range; -Transmission of Air Pollution in Europe

GESAMP

A model used by the Group of Experts on the Scientific Aspects of Marine Pollution

GCM

General Circulation Model

GCTM

Global Chemical Transport Model

GFDL

Geophysical Fluid Dynamic Laboratory

MOGUNTIA

Model of the Global Universal Tracer Transport in the Atmosphere

MSC

Meteorological Synthesizing Centre

NAB

North Atlantic Basin

NAO

North Atlantic Ocean

NAS

National Academy of Sciences

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • J. M. Prospero
    • 1
  • K. Barrett
    • 2
  • T. Church
    • 3
  • F. Dentener
    • 4
  • R. A. Duce
    • 5
  • J. N. Galloway
    • 6
  • H. LevyII
    • 7
  • J. Moody
    • 8
  • P. Quinn
    • 9
  1. 1.University of Miami, RSMASMiami
  2. 2.Norwegian Meteorological InstituteOsloNorway
  3. 3.University of Delaware, College of Marine StudiesNewark
  4. 4.Department of Air QualityWageningen UniversityWageningenThe Netherlands
  5. 5.Texas A & M Univ., College of Geosciences & Maritime StudiesCollege Station
  6. 6.Dept. of Environmental SciencesUniversity of VirginiaCharlottesville
  7. 7.NOAA/GFDLPrinceton UniversityPrinceton
  8. 8.Dept. of Environmental SciencesUniversity of VirginiaCharlottesville
  9. 9.NOAA, Pacific Marine Environmental LaboratorySeattle

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