Monitoring atmospheric nitrous oxide background concentrations at Zhongshan Station, east Antarctica.
At present, continuous observation data for atmospheric nitrous oxide (N2O) concentrations are still lacking, especially in east Antarctica. In this paper, nitrous oxide background concentrations were measured at Zhongshan Station (69°22'25″S, 76°22'14″E), east Antarctica during the period of 2008-2012, and their interannual and seasonal characteristics were analyzed and discussed. The mean N2O concentration was 321.9nL/L with the range of 320.5-324.8nL/L during the five years, and it has been increasing at a rate of 0.29% year(-1). Atmospheric N2O concentrations showed a strong seasonal fluctuation during these five years. The concentrations appeared to follow a downtrend from spring to autumn, and then increased in winter. Generally the highest concentrations occurred in spring. This trend was very similar to that observed at other global observation sites. The overall N2O concentration at the selected global sites showed an increasing annual trend, and the mean N2O concentration in the Northern Hemisphere was slightly higher than that in the Southern Hemisphere. Our result could be representative of atmospheric N2O background levels at the global scale. This study provided valuable data for atmospheric N2O concentrations in east Antarctica, which is important to study on the relationships between N2O emissions and climate change.
Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China.
Wenjuan
W
Ye
Chinese Academy of Meteorological Sciences, Beijing, 100081, China. Electronic address: blg@cams.cma.gov.cn.
Lingen
L
Bian
Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China.
Can
C
Wang
Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China. Electronic address: zhurb@ustc.edu.cn.
Renbin
R
Zhu
Chinese Academy of Meteorological Sciences, Beijing, 100081, China.
Xiangdong
X
Zheng
Chinese Academy of Meteorological Sciences, Beijing, 100081, China.
Minghu
M
Ding
D000393:Air Pollutants / Q000032:analysis*; D000864:Antarctic Regions; D057231:Climate Change; D004784:Environmental Monitoring; D009609:Nitrous Oxide / Q000032:analysis*
D000393:Air Pollutants; D009609:Nitrous Oxide
Antarctica; Greenhouse Gases; N(2)O background concentration; N(2)O characteristics; Zhongshan station