我国瓦里关山、兴隆温室气体CO_2、CH_4和N_2O的背景浓度

BACKGROUND CONCENTRATION OF ATMOSPHERIC CO_2,CH_4 AND N_2O AT MT. WALIGUAN AND XINGLONG IN CHINA

为了研究中国大陆温室性气体CO2 、CH4和N2 O大气浓度的区域分布和变化特征以及与人类活动的关系 ,从 1 995～ 2 0 0 0年 ,先后在青海瓦里关山全球大气基准站 (3 6°1 8′N ,1 0 0°5 4′E ,3 81 0m)及河北中国科学院兴隆天文台 (4 0°2 4′N ,1 1 7°3 0′E ,940m) ,利用不锈钢瓶取样和气相色谱法分析 ,观测了两地大气中温室气体CO2 、CH4和N2 O的浓度及其变化情况。结果表明 :兴隆和瓦里关山站CO2 、CH4和N2 O的同期年平均浓度分别为 3 76.7× 1 0 -6和3 73 .5× 1 0 -6,1 886× 1 0 -9和 1 83 1× 1 0 -9,3 1 6.7× 1 0 -9和 3 1 4.9× 1 0 -9。从 1 995～ 2 0 0 0年 ,兴隆站CO2 、CH4和N2 O的年增长率分别为 1 .95× 1 0 -6,9.0 2× 1 0 -9和 0 .75× 1 0 -9。而瓦里关山站从 1 997～ 2 0 0 0年 ,CO2 、CH4和N2 O的年增长率分别为 1 .41× 1 0 -6,9.95× 1 0 -9和 0 .82× 1 0 -9。两地大气中三种气体的浓度与年增长率与全球同类台站的观测结果接近。

In order to study the characteristics of regional distribution and variation of greenhouse gases, including CO 2, CH 4 and N 2O on the China continent and th eir relationships with human activities, the variations of atmospheric concentra tions of CO 2, CH 4 and N 2O were measured at China Atmosphere Watch Baseline Observatory at Mt. Waliguan (36°18′N, 100°54′E, 3810 m) and at Astronomical Observatory at Xinglong (40°24′N, 117°30′E, 940 m) during the period of 199 5 to 2000 with stainless steel sampling canisters by means of the gas chromatog raphic method. The results show that the average atmospheric concentrations of C O 2, CH 4 and N 2O at both Xinglong and Mt. Waliguan are 376.7×10 -6 an d 373.5×10 -6,1886×10 -9 and 1831×10 -9, 316.7×10 -9 a nd 314.9×10 -9, respectively. From 1995 to 2000,the average annual increm ents of CO 2, CH 4 and N 2O at Xinglong are 1.95×10 -6 mol/mol, 9.02×1 0 -9 mol/mol, and 0.75×10 -9 mol/mol, respectively. The average annua l increments of CO 2, CH 4 and N 2O at Mt. Waliguan are 1.41×10 -6 mol/ mol, 9.95×10 -9 mol/mol and 0.82×10 -9 mol/mol respectively. The a tmospheric concentrations of CO 2, CH 4 and N 2O and the average annual growt h rates are closed to the monitoring results from the similar global observatori es. On the other hand, the results reveal the difference of the environmental ba ckground between Xinglong and Mt. Waliguan to some extent.