Daily Profil Study of the Atmospheric DMS Concentration Near to an Intense Coastal Source at the “Pointe De Penmarc’H”
During a campaign for the study of the chemistry occurring in the oceanic air masses reaching the Western Europe at the “Pointe de Penmarc’h” at July 1988, we have measured the atmospheric DMS concentrations in proximity of an important coastal algae field. The measurements were carried out at two levels (5m and 47m) over the ocean surface with a sampling step of 2 hours.
For thhis study we have used the sampling and analysis developed by our laboratory and already applied in the field studies on the Polarstern in September 1988. The range of the measured concentrations varies between 180 ng(DMS)m-3 and 1500 ng(DMS)m-3 at the low level (5m )and between 35 (DMS)m-3 and 135 ng(DMS)m-3 at the high level. Our mesurements indicate a very strong vertical gradient, which depends on the speed of local wind due to the intensity of the local DMS source.
Finally the dependence of the emission flux in comparison with certain parameters (as low tide, high tide, sunshine) has been proved clearly.
KeywordsHigh Tide Vertical Gradient Methanesulfonic Acid Effect Coast Vertical Dispersion
Unable to display preview. Download preview PDF.
- 1.P.Carlier Synthetic presentation of the european project OCEANONOX. COST 611 WP III workshop, 3–4 may 1988, Villefranche sur mer, -in “field measurements and their interpretation” , S Beilke ,J Morelli, G Angeletti ed. C.E.E. Air Pollution Research No 14, 1988, p 55Google Scholar
- 2.. S. Pashalidis, P. Carlier, G. Mouvier DMS distribution study over the Atlantic ocean during the Polarstern crossing from Bremerhaven to Rio Grande do Sul (lb in dem)Google Scholar
- 3.. R.J. Charlson, J.E. Lovelock, M.O. Andreae, S. Waren Oceanic phytop 1ankton, atmospheric sulphur,cloud albedo and climate Nature, 326, 655, 1987Google Scholar
- . C. Luce These, Université Paris 7, 1984Google Scholar