极地研究2017，Vol.29Issue(1)：56-65,10.DOI:10.13679/j.jdyj.2017.1.056
南极大气CO2、CH4和N2O本底趋势特征分析
BASELINE TRENDS OF ATMOSPHERIC CO2, CH4, AND N2O CONCENTRATIONS IN ANTARCTICA
摘要
Abstract
The long-term baseline trends of the atmospheric greenhouse gases (GHGs) CO2(including δ13C-CO2 and δ18O-CO2 abundances), CH4, and N2O in Antarctica were compared with those from other latitudinal bands. The results suggest that global concentrations of GHGs increase with latitude from south to north, with the lowest (highest) abundance in Antarctica. The overall long-term trends and annual growth rates of GHGs in Antarctica are consistent with the global values, although the trends or growth rates of a concrete gas in Antarctica may quantitatively differentiate from the global values. During 1958–2014, the average growth rate of CO2 concentration in Antarctica (1.43 ± 0.59) mg·L–1·a–1 was lower than that in the tropics (1.51 ± 0.72) mg·L–1·a–1. Conversely, the average growth rate of CO2 concentration in Antarctica during the periods 1980–2014 and 2000–2014 were higher than that in the Southern Hemisphere Middle (SHM) latitu-dinal band but lower than that inthe Northern Hemisphere (NH). The trends of δ13C-CO2and δ18O-CO2 ab-undance reflect the effects of fossil fuel combustion and global-scale processes on global CO2variations. During 1983–2014, the overall growth rate of CH4 concentration in Antarctica (1.43 ± 0.59) μg·L–1·a–1 was lower than that in the NH (6.5 ± 5.6) μg·L–1·a–1, but higher than that in the tropics (5.6 ± 5.3) μg·L–1·a–1 and the SHM (6.1 ± 4.9) μg·L–1·a–1. This confirmed the NH as the largest source of CH4, and the tropics and SHM as substantial CH4 sinks via OH oxidation. The overall average growth rate of atmospheric N2O in Antarctica was (0.87 ± 0.15) μg·L–1·a–1 during 2005–2013; lower (higher) than that in the NH (tropics) and very close to that in the SHM. The difference in the growth rate reflects anthropogenic emissions and the latitude-dependence of the vertical structure of the surface boundary layer, which has obvious influence on surface-level behavior of N2O.关键词
南极/温室气体(CO2、CH4、N2O)/年增速/比较分析Key words
Antarctica/greenhouse gases (GHGs,CO2,CH4,N2O)/annual growth rate/comparison analy-sis引用本文复制引用
孙述蒙,郑向东,卞林根..南极大气CO2、CH4和N2O本底趋势特征分析[J].极地研究,2017,29(1):56-65,10.基金项目
南北极环境综合考察与评估专项(CHINARE2015-04-01)资助 （CHINARE2015-04-01）
