GOME NRT Total Ozone and Profiles
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Please note that these maps are small versions and that each map is clickable. A new window will appear with the normalsized jpg-version of the map. You should use a browser with activated JavaScript. Otherwise go to the Archive section down below, where a data page for each day is available. A brief introduction can also be found further down below. The results on this page are preliminary!
Archive
IntroductionGOME NRT ozone profiles are produced at the Institute of Environmental Physics and Remote Sensing, University of Bremen using the FURM algorithm on GOME NRT Level-1 radiances and irradiances. FURM (FUll Retrieval Method) is an advanced Optimal Estimation inversion scheme to derive ozone profiles from the UV spectra. FURM consists of two major parts: (a) a forward model: the pseudo-spherical multiple scattering radiative transfer model (RTM) GOMETRAN++, calculating the top of atmosphere (TOA) radiance for a given state of the atmosphere, and (b) an iterative inversion scheme, that adjusts this state to match the calculated with the measured TOA radiance, utilizing the so-called weighting functions also provided by GOMETRAN. Because this inversion problem is under-constrained, an optimal estimation approach was chosen, which combines the information from the measurement with statistical a-priori information from a climatology. For good results, reliable information about the meteorological conditions, e.g. temperature and pressure profile are needed. We usually use UKMO - UARS assimilated data for this purpose, because data are available up to about 55km. For NRT profile retrieval, this is not possible, because the UKMO data are not available until the next day. Instead, we use the 24hour forecast provided by ECMWF. Because these data reach only up to 30km altitude, the profiles are extended by UKMO data of the previous day. FURM profile retrieval is currently limited to solar zenith angles less then 75 degree, thus the most nothern GOME pixel are not usable.
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Responsible: Klaus Bramstedt / Kai-Uwe Eichmann / Last Change. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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