Modeling sea-salt aerosols in the atmosphere: 2. Atmospheric concentrations and fluxes

Gong, S. L.; Barrie, L. A.; Prospero, J. M.; Savoie, D. L.; Ayers, G. P.; Blanchet, J.-P. et Spacek, L. (1997). « Modeling sea-salt aerosols in the atmosphere: 2. Atmospheric concentrations and fluxes ». Journal of Geophysical Research: Atmospheres, 102(D3), pp. 3819-3830.

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Atmospheric sea-salt aerosol concentrations are studied using both long-term observations and model simulations of Na+ at seven stations around the globe. Good agreement is achieved between observations and model predictions in the northern hemisphere. A stronger seasonal variation occurs in the high-latitude North Atlantic than in regions close to the equator and in high-latitude southern hemisphere. Generally, concentrations are higher for both boreal and austral winters. With the model, the production flux and removal flux at the atmosphere-ocean interface was calculated and used to estimate the global sea-salt budget. The flux also shows seasonal variation similar to that of sea-salt concentration. Depending on the geographic location, the model predicts that dry deposition accounts for 60–70% of the total sea-salt removed from the atmosphere while in-cloud and below-cloud precipitation scavenging accounts for about 1% and 28–39% of the remainder, respectively. The total amount of sea-salt aerosols emitted from the world oceans to the atmosphere is estimated to be in the vicinity of 1.17×1016 g yr−1. Approximately 99% of the sea-salt aerosol mass generated by wind falls back to the sea with about 1–2% remaining in the atmosphere to be exported from the original grid square (300×300 km). Only a small portion of that exported (∼4%) is associated with submicron particles that are likely to undergo long-range transport.

Type: Article de revue scientifique
Mots-clés ou Sujets: Aerosol, atmospheric model, concentration, flux, salt particles, sea salt
Unité d'appartenance: Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par: Jean-Pierre Blanchet
Date de dépôt: 22 avr. 2016 14:53
Dernière modification: 25 avr. 2016 15:45
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