Nitrous Oxide Flux Estimates for South-Eastern Australia |
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| Authors: | S R WILSON A L DICK P J FRASER S WHITTLESTONE |
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| Institution: | (1) Department of Chemistry, University of Wollongong, NSW, 2522, Australia;(2) Cape Grim Baseline Air Pollution Station, Bureau of Meteorology, Smithton, Tasmania, 7330, Australia;(3) Division of Atmospheric Research, Commonwealth Scientific and Industrial Research Organisation, Private Bag 1, Aspendale, Victoria, 3195, Australia;(4) Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, NSW, 2234, Australia |
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| Abstract: | Nitrous oxide (N2O) fluxes for south-easternAustralia have been estimated using a combination ofthe in situ N2O and radon (Rn) measurementsmade at the Cape Grim Baseline Air Pollution Station,in north-west Tasmania. The average N2O fluxesfrom the south-eastern mainland of Australia and fromTasmania over the nine years of record analysed (1985–1993) have beenfound to be 130 ± 30 kgN km-2yr-1 and 160 ± 45 kgN km-2yr-1respectively. These fluxes are larger than expectedand a significant dependence of the flux on rainfallis observed, with greater fluxes in the spring (October–December) andduring periods of positive SouthernOscillation Index. A large flux (1,300 ± 500kgN km-2 yr-1) from a nearby island (KingIsland) was also estimated from the data record,indicating a strong source, although the small size ofthe island means that it is not a significant sourcefor Australia. |
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| Keywords: | nitrous oxide (N2O flux Australia radon rainfall dependence |
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