›› 2004, Vol. 12 ›› Issue (2): 145-149.DOI: 10.11733/j.issn.1007-0435.2004.02.015

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Atomosphere CO2 Concentration and Its Variation Characters Above Inner Mongolia Grassland In Grass Growing Season

WANG Gengchen, KONG Qin-xin, DU Rui, WAN Xiao-wei   

  1. Institute of Atmospheric Physics, CAS, Beijing 100029, China
  • Received:2003-05-10 Revised:2004-01-10 Online:2004-05-15 Published:2004-05-15

内蒙古草原生长季节大气中CO2浓度及其变化特征研究

王庚辰, 孔琴心, 杜睿, 万小伟   

  1. 中国科学院大气物理研究所, 北京, 100029
  • 作者简介:王庚辰(1940- ),男,河北灵寿人,研究员,主要从事大气环境研究工作
  • 基金资助:
    国家自然科学基金项目(49790025,40075028)资助

Abstract: A four-year survey (1999-2002) was conducted of the atmosphere CO2 concentration above the Inner Mongolia grassland and its variations during the grass growing season. The result shows that the grass growing season witnessed significant changes of both CO2 concentration at large,and CO2 concentration above the grassland surface in vertical gradient,within a day and one day from another, The 4-year daily mean CO2 concentration in the atmosphere averaged 361.6 μL/L;and the annual variation fluctuated around 13.5 μL/L. The daily CO2 concentration above the grassland could be diagrammed in the shape of a saddle,oscillating between 27-37 μL/L,with some particular days reaching as high as 80 μL/L. During the grass growing season,the Iarther the vertical distance away from the ground surface,the thinner the atmosphere CO2 concentration becomes,with a decreasing rate of 0.94 μL/L per meter.

Key words: Inner-Mongolia grassland, CO2 concentration, CO2 gradient, diurnal variation

摘要: 1999~2002年对内蒙古草原生长季节近地面层大气中的CO2浓度及其变化进行观测研究。结果表明:CO2浓度及CO2在近地层的浓度梯度在生长季节均有明显的日变化和逐日变化;观测期间,大气中CO2浓度四年平均日均值为361.6 μL/L,其年变化幅度约为13.5 μL/L;草原上空CO2的日变化通常呈马鞍型,平均日变化幅度为27~37 μL/L,个别日期可达80 μL/L;生长季节草原上空近地大气层中CO2浓度随着高度的增加而递减,平均递减率为0.94 (μL/L)/m。

关键词: 草原学, 内蒙古草原, CO2浓度, CO2梯度, 日变化

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