Discrete measurements of atmospheric reactive mercury at Amsterdam Island (L1)

L1 time series of active/discrete reactive mercury concentrations in ambient air at the Amsterdam (AMS) island district station (Pointe Benedicte atmospheric research station). Time-integrated samples were collected using polyethersulfone cation exchanges membranes and later analysed by cold vapour atomic fluorescence spectroscopy. **Amsterdam Island** is a small island (55km2) located in the southern Indian Ocean (37◦48 S, 77◦34 E), 3400km and 5000km downwind from the nearest lands, Madagascar and South Africa, respectively. Instrumentation dedicated to the study of atmospheric mercury is located at the Pointe Benedicte station, at the northwest end of the island, 70m above sea level and 2km west of the scientific base (30 residents at most).