[AAS06-P27] Ground-based FTIR Observations of HCFC-22, HCFC-142b and HFC-23
Keywords:FTIR, HCFCs, HFCs, Greenhouse Gas, Antarctic Syowa Station
In this study, we tried to retrieve the profiles of CHF2Cl (HCFC-22), CH3CClF2 (HCFC-142b) and CHF3 (HFC-23) from the atmospheric absorption spectra taken by ground-based FTIR at Syowa station for the period from 2007 to 2016. All profile retrievals for the target gases have been performed with the SFIT4 inversion program which is based on the optimal estimation method of Rodgers (Rodgers, 2000). For the line parameters of the target species, the Pseudo-Line-Lists (PLL) provided by G. C. Toon (NASA/JPL) are used (http://mark4sun.jpl.nasa.gov/pseudo.html). As a result, the analyzed total column trend for HCFC-142b between 2007 and 2011 is ∼6%/year, while since 2011 the abundance started to decline. The trends for HCFC-22 and HFC-23 for the period from 2007 to 2016 are ~4%/year and ~5%/year, respectively. We will also analyze the abundances of the target gases above Rikubetsu station in Japan (43.46°N, 143.77°E). In this presentation, the comparison of our measurements with data of the in-situ surface observations and flask sampling operated by NOAA/ESRL will be shown.
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