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CO, CH4, N2O and CO2 were retrieved from high resolutionsolar absorption spectra obtained during a ship cruise from Capetown toBremerhaven in January/February 2003 by Fourier Transform Infrared (FTIR)spectroscopy. Precisions of better than 0.5% for the column averagedvolume mixing ratios (VMR) of CH4 and CO2 are achieved using ofO2 as a reference gas. Shipborne FTIR-measurements of CO and data fromSCIAMACHY/ENVISAT retrieved by the Weighting Function Modified DifferentialOptical Absorption Spectroscopy (WFM-DOAS) retrieval algorithm showqualitatively the same latitudinal variations. WFM-DOAS data of CH4,N2O and CO2 measured over sea exhibit a great spread. The spreadis significantly reduced for satellite measurements over land and areasonable agreement can be obtained if the shipborne data are compared withthe closest SCIAMACHY measurements over land. The number of comparisons istoo small to draw conclusions. However, by including only WFM-DOAS data withsmall errors the shipborne and WFM-DOAS data compare within 5% forCH4 and CO2 and within 30% for N2O

atmospheric chemistry and physics

Shipborne solar absorption measurements of CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;, N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O and CO and comparison with SCIAMACHY WFM-DOAS retrievals