Abstract: The balloon-borne Aircore campaign was conducted in Inner Mongolia, China, on June 13 and 14 2018, which detected carbon dioxide (CO2) and carbon monoxide (CO) profiles from surface to 24 km, showing strong positive and negative correlations between 8 km and 10 km on 13 and 14 June, respectively. Backward trajectories, meteorological analyses, and CO2 horizontal distributions were combined to interpret this phenomenon. The results indicated that the source region experienced a stratospheric intrusion and exhibited a large horizontal CO2 gradient; namely, lower CO concentrations corresponded to higher CO2 concentrations and vice versa. The laminar structure with multiple origins resulted in the highly negative correlation between CO2 and CO in the upper troposphere on 14 June. The contribution of stratospheric air mass to the upper troposphere and that of tropospheric air mass to the lower stratosphere were 26.7% and 24.3%, respectively, based on a mass balance approach. Another interesting phenomenon is that CO2 and CO concentrations increased substantially at approximately 8 km on 13 June. An analysis based on the backward trajectory implied that the air mass possibly came from anthropogenic sources. The slope of CO2/CO representing the anthropogenic sources was 87.3 ppm ppm？1. In addition, the CO2 profile showed that there was a large CO2 gradient of 4 ppm km？1 within the boundary layer on 13 June, and this gradient disappeared on 14 June.
摘要: 2018年6月13日和14日，在内蒙古锡林浩特开展了长管下投采样实验。在实验中，探测到在6月13日和14日的二氧化碳（CO2）廓线和一氧化碳（CO）廓线在8公里到10公里高度分别呈现高度正相关和负相关。利用后向轨迹、气象资料以及CO2水平分布来理解这个现象。结果显示6月14日锡林浩特地区的气流来源于西北部的贝加尔湖地区附近，该地区在垂直方向上出现了平流层入侵现象，水平方向上CO2呈现较大梯度，即平流层入侵造成的CO低值的区域是CO2的高值区，反之亦然。多层片状结构导致了6月14日在8公里到10公里之间的CO2和CO的正相关。根据质量平衡方法，平流层气团对对流层的贡献和对流层气团对平流层的贡献分别为26.7%和24.3%。6月13日，CO2和CO在8公里高度处显著增加。根据后向轨迹可知该气团来源于人为污染地区。代表人为污染源的CO2/CO的斜率为87.3 ppm ppm？1。除此之外，CO2廓线在边界层中存在4 ppm km？1的较大梯度，而这个梯度在14日的边界层中消失。
全文下载链接：Direct Observations of Atmospheric Transport and Stratosphere-Troposphere Exchange from High-Precision Carbon Dioxide and Carbon Monoxide Profile Meas.pdf