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Monomethylamine (MA), dimethylamine (DMA) and diethylamine (DEA) weredetected at non-negligible concentrations in sub-micrometer particles atthe Cap Verde Atmospheric Observatory (CVAO) located on the island ofSão Vicente in Cape Verde during algal blooms in 2007. Theconcentrations of these amines in five stage impactor samples ranged from 0–30 pg m−3 for MA, 130–360 pg m−3for DMA and 5–110 pg m−3 for DEA during the spring bloom in May 2007 and 2–520 pg m−3 for MA, 100–1400 pg m−3 forDMA and 90–760 pg m−3 for DEA during an unexpected winter algal bloom inDecember 2007. Anomalously high Saharan dust deposition and intensive oceanlayer deepening were found at the Atmospheric Observatory and the associatedOcean Observatory during algal bloom periods. The highest amineconcentrations in fine particles (impactor stage 2, 0.14–0.42 μm)indicate that amines are likely taken up from the gas phase into the acidicsub-micrometer particles. The contribution of amines to the organiccarbon (OC) content ranged from 0.2–2.5% C in the winter months,indicating the importance of this class of compounds to the carbon cycle inthe marine environment. Furthermore, aliphatic amines originating frommarine biological sources likely contribute significantly to the nitrogencontent in the marine atmosphere. The average contribution of the amines tothe detected nitrogen species in sub-micrometer particles can benon-negligible, especially in the winter months (0.1% N–1.5% N in thesum of nitrate, ammonium and amines). This indicates that these smalleraliphatic amines can be important for the carbon and the nitrogen cycles inthe remote marine environment

Seasonal variation of aliphatic amines in marine sub-micrometer particles at the Cape Verde islands