Validation of CAMS reanalysis data with surface CH4 measurements in the high-latitude Arctic
M.A. Ezhikova, S.P. Smyshlayev
Russian State Hydrometeorological University, St. Petersburg, Russia
Keywords: methane, atmospheric composition, the Arctic, CAMS reanalysis
Abstract
Studying the spatial distribution and temporal variation in CH4 concentration as a greenhouse gas is a relevant but difficult scientific task in the Arctic. Reanalysis data can serve an additional source of information, but they require regular validation. This study presents the results of an assessment of the reproduction of surface CH4 concentration by CAMS global greenhouse gas reanalysis database version EGG4 in the Arctic region. Reanalysis data on the surface CH4 concentrations variations are compared with continuous measurements at the research station “Ice Base Cape Baranova" (79°16' N, 101°45' E) in 2016-2020 on different time scales (interannual, seasonal, daily). It is found that reanalysis data reflect the interannual variability of surface CH4 concentrations the worst. The seasonal variability of the CH4 concentration is well described by the reanalysis data, the model amplitudes of the seasonal cycle are slightly higher than the actual ones. The comparison of the model and actual values of surface temperature and wind speed and direction are also carried out. Such verification of the CAMS database is useful before its subsequent using in regional-scale numerical modeling and other applied problems.
|
