Validation of ENVISAT/SCIAMACHY columnar methane by solar FTIR spectrometry at the Ground-Truthing Station Zugspitze

摘要

Methane total-vertical column retrievals from ground-based solar FTIRmeasurements at the Permanent Ground-Truthing Station Zugspitze (47.42° N,10.98° E, 2964m a.s.l.), Germany are used to validate column averagedmethane retrieved from ENVISAT/SCIAMACHY spectra by WFM-DOAS (WFMD) version0.4 and 0.41 for 153 days in 2003. Smoothing errors are estimated to bebelow 0.10% for FTIR and 0.14% for SCIAMACHY-WFMD retrievals and canbe neglected for the assessment of observed bias and day-to-day-scatter. Inorder to minimize the altitude-difference effect, dry-air column averagedmixing ratios (XCH₄) have been utilized. From the FTIR-time series ofXCH₄ an atmospheric day-to-day variability of 1% was found, and asinusoidal annual cycle with a ≈1.6% amplitude. To obtain theWFMD bias, a polynomial fitted to the FTIR series was used as a reference.The result is WFMD v0.4/FTIR=1.008±0.019 and WFMD v0.41/FTIR=1.058±0.008.WFMD v0.41 was significantly improved by atime-dependent bias correction. It can still not capture the naturalday-to-day variability, i.e., the standard deviation calculated from thedaily-mean values is 2.4% using averages within a 2000-km radius, and2.7% for a 1000-km radius. These numbers are dominated by a residualtime-dependent bias in the order of 3%/month. The latter can bereduced, e.g., from 2.4% to 1.6% as shown by an empiricaltime-dependent bias correction. Standard deviations of the daily means,calculated from the individual measurements of each day, are excludingtime-dependent biases, thus showing the potential precision of WFMD dailymeans, i.e., 0.3% for a 2000-km selection radius, and 0.6% for a1000-km selection radius. Therefore, the annual cycle as well as possibly the day-to-dayvariability could be captured under the prerequisite of further advanced time-dependentbias corrections, or the use of other channels, where the icing issue is less prominent.