We want to estimate the contribution of marine aerosols from oceans to the concentration of PM10 in a Caribbean city. Undoubtedly the Na+ is a chemical species to consider. What other elements can we consider?
In my previous work (in Sfax, Tunisia located in the Southern Mediterranean Sea area) and regarding to other works (in Mediterranean basin), the chlorine has been used as tracer of marine source.
So I will attach you my work and other references which could help you in your research and you could contact me if you need any help in this way.
In W/C-Europe the range is even further: at Duisburg (Kuhlbusch and John) and Melpitz (Spindler, Konrad Mueller) rather high Na and Cl are found in PM2.5-10 with winds from the NW-sector