A simple model for K and Ca enrichment interpretation in Antarctic snow

The presence of surface active fluorescent organic matter (SAFOM) in Antarc tic snow, similar to the marine matter, suggests that micro components pres ent at the sea surface, capable of interacting with SAFOM, may be transport ed via marine aerosol. Experimental evidence is given by the enrichment of SAFOM in the smallest marine aerosol particles and by the interaction of K and Ca with SAFOM. The surfactant concentration at the sea surface during l arge whitecaps coverage is also studied. A hypothesis for the K and Ca exce ss, evidenced in Antarctic snow at high altitudes, is proposed by means of a spray drop adsorption layer model (SDALM). This model is the result of an improved analysis of the breaking wave process, and of additional experime ntal findings. It seems to justify the excess concentration of K and Ca wit h respect to that expected for marine water compositions in high altitude s now in Antarctica. It may also constitute a more general basis for the inte rpretation of the fine fraction aerosol composition in remote marine areas.