Monitoring the concentration of N2O in the Fildes Peninsula, maritime Antarctica

Gases in the marine boundary layer in Fildes Peninsula, maritime Antarctica were sampled and analyzed for the first time. Sampling sites included area s covered by moss and lichen growth, penguin colonies and an area where sci entific research stations are located. A total of 211 samples were analyzed for N2O concentrations, with an average of (321.33+/-3.07) nL/L. This is a bove the global average value of 314 nL/L. it is found that the N2O concent rations evidently increase during the summer months. Concentrations around the research stations are higher than at remote areas, indicating a potenti al source from human activities on the island, N2O concentrations at a larg e penguin colony on Barton Peninsula are the highest among the sampled area s. This may explain why N2O concentrations in Fildes Peninsula are higher t han the global average. Our preliminary conclusions are that human activiti es and emissions from penguin dropping-amended soil and vegetation soil con stitute the major sources of N2O in the maritime Antarctic atmosphere.