Nitrous oxide flux estimates for south-eastern Australia

被引:25
|
作者
Wilson, SR
Dick, AL
Fraser, PJ
Whittlestone, S
机构
[1] BUR METEOROL,CAPE GRIM BASELINE AIR POLLUT STN,SMITHTON,TAS 7330,AUSTRALIA
[2] CSIRO,DIV ATMOSPHER RES,ASPENDALE,VIC 3195,AUSTRALIA
[3] AUSTRALIAN NUCL SCI & TECHNOL ORG,MENAI,NSW 2234,AUSTRALIA
关键词
nitrous oxide (N2O); flux; Australia; radon; rainfall dependence;
D O I
10.1023/A:1005828617711
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nitrous oxide (N2O) fluxes for south-eastern Australia have been estimated using a combination of the in situ N2O and radon (Rn) measurements made at the Cape Grim Baseline Air Pollution Station, in north-west Tasmania. The average N2O fluxes from the south-eastern mainland of Australia and from Tasmania over the nine years of record analysed (1985-1993) have been found to be 130 +/- 30 kgN km(-2) yr(-1) and 160 +/- 45 kgN km(-2) yr(-1) respectively. These fluxes are larger than expected and a significant dependence of the flux on rainfall is observed, with greater fluxes in the spring (October-December) and during periods of positive Southern Oscillation Index. A large flux (1, 300 +/- 500 kgN km(-2) yr(-1)) from a nearby island (King Island) was also estimated from the data record, indicating a strong source, although the small size of the island means that it is not a significant source for Australia.
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页码:169 / 188
页数:20
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