Usability of optical spectrum analyzer in measuring atmospheric CO2and CH4 column densities: inspection with FTS and aircraft profiles in situ

[摘要] The practical usefulness of a desktop optical spectrum analyzer (OSA) formeasuring atmospheric CO₂ and CH₄ column densities at surfacesites was examined in two separate measurement campaigns. The firstcomparison involved operating the OSA in parallel with a high resolutionFourier transform spectroscopy (FTS) situated at the University ofWollongong in Australia. Scale factors for the OSA were assigned for thecolumn average volume mixing ratios of xCO₂ and xCH₄ by comparingwith the well-studied FTS. The second method is a calibration againstaircraft CO₂ profiles in situ over Tsukuba in Japan obtained during aGOSAT validation campaign carried out from 28 January to 7 February 2011.The xCO₂ values in the campaign, deduced by use of a derived OSA scalefactor, were in excellent agreement with the integrated aircraft profiles.

[学科分类] 几何与拓扑