On the dynamic of the atmospheric input of copper and manganese into the Western Mediterranean Sea - Laboratoire interuniversitaire des systèmes atmosphériques Accéder directement au contenu
Article Dans Une Revue Atmospheric Environment Année : 1991

On the dynamic of the atmospheric input of copper and manganese into the Western Mediterranean Sea

Résumé

Daily 24-h aerosol samples have been collected at a coastal location in northwestern Corsica, between February 1985 and March 1988. Total deposition has been sampled between February 1985 and October 1987 with a time span of about 15 days. Three-dimensional air-mass trajectory analysis indicates that atmospheric Cu and Mn over the western Mediterranean are long-range transported from continental source regions. We show that the scavenging of atmospheric Cu and Mn by rain generates a seasonal cycle with high aerosol concentrations during the dry season and lower aerosol concentrations during the wet season. Sporadic but intense Saharan dust transport events are responsible for the highest atmospheric concentrations of Mn. The ratios between the atmospheric deposition of Cu and Mn and the corresponding mean daily precipitation rate reach a maximum during the Mediterranean summer. We attribute this behaviour to the wet scavenging of a more loaded atmosphere during the dry season than during the wet season. The precipitation frequency (Fp) is a major factor influencing the seasonal variability of the atmospheric Cu deposition and, this is in agreement with what we observe for the atmospheric Pb deposition. Our results also suggest that the relationship between the seasonal variability of Mn deposition and the Fp is less direct. This is due to the occurrence of Saharan dust transport events which strongly influence the variability of the Mn total deposition.

Dates et versions

hal-02328205 , version 1 (24-10-2019)

Identifiants

Citer

E Remoudaki, G. Bergametti, Rémi Losno. On the dynamic of the atmospheric input of copper and manganese into the Western Mediterranean Sea. Atmospheric Environment, 1991, 25 (3-4), pp.733-744. ⟨10.1016/0960-1686(91)90072-F⟩. ⟨hal-02328205⟩
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