青海瓦里关大气CO_2本底浓度的变化特征

Change characteristics of atmospheric CO_2 background concentration in Waliguan Qinghai.

对中国瓦里关大气本底基准观象台（全球基准站）1994年11月-2005年6月近10年来的大气CO2连续观测资料进行了统计分析．结果表明，瓦里关大气CO2本底浓度具有明显的季节变化，最高值出现在每年的4月末-5月初，最低值出现在夏季的7、8月份；CO2浓度的日变化幅度在夏季比较明显，其他季节的日变化则相对平稳；现场连续监测结果与美国海洋大气管理局，气候监测与诊断试验室（NOAA／CMDL）分析的气瓶采样资料有很好的一致性，并与全球大气CO2监测资料有很好的可比性；1995—2004年瓦里关地区大气CO2的平均增长率约为1．83μmol／（mol·a），其中以1998—1999年和2002—2003年最为明显．2003年我国内陆大气CO2年平均浓度增长率达到了2．70μmol／（mol·a），为近10年来的最大值，其年增长幅度略小于世界气象组织全球大气监测系统（WMO/GAW）中北半球近海的同类监测台站。但变化趋势基本一致，我国内陆大气CO2本底浓度的年平均值约增加了4．6％．

Statistical analyzes were made on the recent 10 years continuous observation data of atmospheric CO2 data of China Waliguan atmospheric baseline observatory （global observatoly）. The Waliguan CO2 background concentration possessed obvious seasonal change. Its highest value appeared at the end of April and the beginning of May and the lowest at July, August in summer; the daily CO2 concentration range was obvious, relatively distinctly in summer and stable relatively in other seasons; the results of continuous monitor data in-situ were very accordant with the analyzed data of NOAA/CMDL, U.S.A. and could compare very well with the global monitor data; 1995-2004, the CO2 mean concentration in Waliguan area was about 1.83μmol/（mol·a）, in which 1998-1999 and 2002-2003 were most obvious. In 2003 the CO2 mean annual concentration growth rate reached 2.70μmol/（mol·a） inland in our country, being the greatest value in recent 10 years; and the annual growth range was less a tittle than the other WMO/GAW stations, but the change trend was accordant basically. The annual average value of the atmospheric CO2 background concentration increased about 4.6% inland in our country.