基于压差的二氧化碳垂直采样分析技术  

A balloon-borne sampler system based on the pressure gradient for vertical profile measurements of CO2

作　　者：梁苗 方双喜[1] 刘毅[2] 姚波[1] 王勇[2] 马千里 易游 郭敏锐 LIANG Miao;FANG Shuang-xi;LIU Yi;YAO Bo;WANG Yong;MA Qian-li;YI You;GUO Min-rui(Meteorological Observation Centre,China Meteorological Administration,Beijing 100081,China;Key Laboratory for Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;Zhejiang Lin’an Regional Atmosphere Watch Station,Lin’an 311307,China;College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China)

机构地区：[1]中国气象局气象探测中心,北京100081 [2]中国科学院大气物理研究所,北京100029 [3]中国气象局浙江临安大气本底站,浙江临安311307 [4]北京师范大学全球变化与地球系统科学研究院,北京100875

出　　处：《中国环境科学》2019年第10期4117-4124,共8页China Environmental Science

基　　金：科技部国家重点研发计划项目(2017YFB0504000);国家自然科学基金资助项目(41805129&41730103)

摘　　要：本研究开发了一套基于直接采样技术的二氧化碳(CO2)垂直廓线采样分析系统,分析近地面至25km高空CO2浓度的垂直分布.系统通过压差实现垂直方向连续采样,利用CRDS高精度分析技术对不同高度样品进行定量分析,计算得到采样区域CO2浓度廓线.于2018年6月13~14日,在内蒙古锡林浩特国家气候观象台利用平流层探空气球平台进行了观测实验.实验室测试显示,CO2分析准确度优于0.06×10-6,精度优于0.08×10-6.外场实验获得区域近地面至25km高空CO2浓度的高分辨率垂直廓线,显示CO2在不同高度的分层结构.考虑不同高度样品扩散作用,系统垂直分辨率在10km高度以下优于580m,在10~20km高度优于3.3km.研究表明:分析系统可搭载在合适探空平台上进行CO2垂直观测,获取浓度廓线,可为传输模式提供数据,并为碳卫星遥感数据提供实测数据校验.A balloon-borne sampling system for vertical profile of atmospheric CO2 from the surface to 25 km was developed and field-tested.The sampler is deployed on a stratospheric balloon and relies on passively collecting air using the atmospheric pressure gradient during descent.The atmospheric sample through continuous sampling is measured by a cavity ring-down spectrometer(CRDS)for CO2 upon recovery.Field campaigns were conducted for the first time on June 13th and 14th,2018 at Xilinhaote Observatory.Measurements of CO2 mole fractions in laboratory tests indicated a repeatability of 0.08×10-6 and bias to better than 0.06×10-6(1σ)for CO2 under various conditions.The vertical resolution with our configuration was determined to be 580m up to 10km and better than 2.0km up to 20km respectively according to the molecular diffusion of the sample.The system provides an in situ method of greenhouse gas measurements for validation of satellite data and estimation of regional flux.

关 键 词：垂直采样 二氧化碳 浓度廓线 垂直分辨率 平流层 

分 类 号：X830.2[环境科学与工程—环境工程]