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The Fourier transform spectrometer MIPAS (Michelson Interferometer for Passive Atmospheric Sound- ing) on Envisat measures infrared emission of the Earth's atmosphere in a limb viewing mode. High spectral resolu- tion measurements of MIPAS are sensitive to formaldehyde from the upper troposphere to the stratopause. Single profile retrievals of formaldehyde are dominated by a 60% noise er- ror; however zonal mean values for 30 days of data during 8 September 2003 and 1 December 2003 reduces this error by a factor of 20 or more. The number of degrees of freedom for single profile retrieval ranges from 2 to 4.5 depending on lati- tude and number of cloud-free tangent altitudes. In the upper tropical troposphere zonal mean values of about 70 parts per trillion by volume (pptv) were found, which have been at- tributed to biomass burning emissions. In the stratosphere, formaldehyde values are determined by photochemical reac- tions. In the upper tropical stratosphere, formaldehyde zonal mean maximum values can reach 130 pptv. Diurnal varia- tions in this region can be up to 50 pptv. Comparisons with other satellite instruments show generally good agreement in the region of upper troposphere and lower stratosphere as well as in the upper stratosphere.

atmospheric chemistry and physics

Retrieval of global upper tropospheric and stratospheric formaldehyde (H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;CO) distributions from high-resolution MIPAS-Envisat spectra