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Retrieval of tropospheric column-averaged CH<sub>4</sub> mole fraction by solar absorption FTIR-spectrometry using N<sub>2</sub>O as a proxy

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Fig. 1. Correlations between the stratospheric mole fractions of N 2 O (right) and HF (left) with CH 4 on a global scale
Fig. 2. Comparison between constant a derived from original and scaled GFIT a priori, ACE- ACE-FTS satellite data at Spitsbergen.
Fig. 3. The averaging kernels of HF, N 2 O and CH 4 at Bialystok for all spectra from 2010
Fig. 4. Comparison results of two methods at Spitsbergen. The red points correspond to the tropospheric column-averaged CH 4 mole fraction derived from N 2 O and explicitly using tropopause pressure, the blue to those derived from N 2 O and implicitly usin
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