Meteosat-7 and its predecessors were the first generation of earth observation dedicated geostationary satellites located at 36000 km above the intersection of the Equator and the Greenwich Meridian. Although superseded by MSG-1 (renamed Meteosat-8) in 2005, Meteosat-7 remained as back-up at 0o longitude until 14th June 2006. Meteosat-7 will be moved to 63oE longitude to continue coverage of the Indian Ocean and take over from Meteosat-5. Meteosat-7 was launched by the European Space Agency and operated by Eumetsat. This dataset contains visible images from Meteosat Geostationary Satellites First Generation satellites over full disc.

Meteosat-7 and its predecessors were the first generation of earth observation dedicated geostationary satellites located at 36000 km above the intersection of the Equator and the Greenwich Meridian. Although superseded by MSG-1 (renamed Meteosat-8) in 2005, Meteosat-7 remained as back-up at 0o longitude until 14th June 2006. Meteosat-7 will be moved to 63oE longitude to continue coverage of the Indian Ocean and take over from Meteosat-5. Meteosat-7 was launched by the European Space Agency and operated by Eumetsat. This dataset contains visible images from Meteosat Geostationary Satellites First Generation over Europe and the North Atlantic.

NERC-UTLS Ozone Thematic Program, 'Night-Time Chemistry of the Upper Troposphere and Lower Stratosphere' project measuring sunrise NO3 and sunset NO2 column densities above Aberystwyth. This dataset contains column density and profiles of NO3.

Meteosat-7 and its predecessors were the first generation of earth observation dedicated geostationary satellites located at 36000 km above the intersection of the Equator and the Greenwich Meridian. Although superseded by MSG-1 (renamed Meteosat-8) in 2005, Meteosat-7 remained as back-up at 0o longitude until 14th June 2006. Meteosat-7 will be moved to 63oE longitude to continue coverage of the Indian Ocean and take over from Meteosat-5. Meteosat-7 was launched by the European Space Agency and operated by Eumetsat. This dataset contains water vapour images from Meteosat Geostationary Satellites First Generation satellites over Europe and the North Atlantic.

Meteosat-7 and its predecessors were the first generation of earth observation dedicated geostationary satellites located at 36000 km above the intersection of the Equator and the Greenwich Meridian. Although superseded by MSG-1 (renamed Meteosat-8) in 2005, Meteosat-7 remained as back-up at 0o longitude until 14th June 2006. Meteosat-7 will be moved to 63oE longitude to continue coverage of the Indian Ocean and take over from Meteosat-5. Meteosat-7 was launched by the European Space Agency and operated by Eumetsat. This dataset contains visible images from Meteosat Geostationary Satellites First Generation North Atlantic.

The UTLS-Ozone THESEO (Third European Stratospheric Experiment on Ozone) project was joint activity between the Centre of Atmospheric Sciences at the University of Cambridge and the National Physical Laboratory. THESEO's overall scientific objective were to contribute to the understanding of middle latitude ozone loss by making measurements of a number of important tracers of atmospheric motion and photochemistry, and by interpreting these measurements with state-of-the-art models of atmospheric chemistry and transport. The particular aim of the proposal was to extend THESEO measurements of tracer and chemically active gases both spatially and temporally to provide more comprehensive coverage in the middle latitude low stratosphere and upper troposphere. The measurements were complement the similar EU funded measurements whose focus were primarily high and mid-latitudes in 1998/99. They were part of THESEO 2000 which was an extension of THESEO and which formed the basis of European collaboration with US SOLVE experiment which is studying Arctic ozone loss in the 1999/2000 winter. Together, these measurements provide a unique data set for the study of chemistry and transport processes at mid latitudes. They studied annual transport through the middle latitude lower stratosphere and the processes of mixing with tropical and polar air. Data were interpreted using 3D chemical transport models already developed at Cambridge. The large amount of data collected in polar middle and tropical latitudes during THESEO provided a unique opportunity for the new mid-latitude data to contribute to the understanding of middle latitude ozone decline and, in particular, to understanding the relative importance of in situ ozone loss and transport from other regions. Balloon flights were made from Esrange Kiruna station during the 1999/2000 winter, with balloon payloads incorporating the same UK and European instruments deployed during THESEO.

Meteosat-7 and its predecessors were the first generation of earth observation dedicated geostationary satellites located at 36000 km above the intersection of the Equator and the Greenwich Meridian. Although superseded by MSG-1 (renamed Meteosat-8) in 2005, Meteosat-7 remained as back-up at 0o longitude until 14th June 2006. Meteosat-7 will be moved to 63oE longitude to continue coverage of the Indian Ocean and take over from Meteosat-5. Meteosat-7 was launched by the European Space Agency and operated by Eumetsat. This dataset collection contains visible, water vapour, thermal and infra-red images of the North Atlantic Ocean, Europe and North Africa from the Meteosat geostationary satellite. Images are archived from 11th November 1999 to June 2006. These images are public. Data were collected every half hour in three wavelength channels for visible, infra-red and water vapour images.

The African Easterly Jet (AEJ) is part of a climatic system which is of critical importance to African and global weather and climate, but is poorly observed and not well represented in model analyses. For the JET2000 project the Met Office Met Research flight (MRF) aircraft performed four flights, involving transects along and across the jet and the baroclinic zone, to make observations of unprecedented resolution for this part of the world. 110 dropsondes were dropped along the fight path. The Objectives were: 1. African Easterly Jet: To provide detailed synoptic observations of the basic state over mainland West Africa. This will focus on the AEJ and its associated temperature, humidity and PV contrasts. 2. African Easterly Waves: To provide detailed synoptic observations of the AEWs over mainland tropical West Africa. 3. Operational analyses and Forecasts: To assess the impact on operational analyses and forecasts of having extra observations over mainland West Africa for the period of the experiment. The data includes detailed synoptic observations of the basic state over mainland West Africa, and detailed synoptic observations of the African Easterly Waves (AEW) over mainland tropical West Africa.

Infrared radiances from the Limb Infrared Monitor of the Stratosphere (LIMS) instrument, mounted on the Nimbus-7 satellite, were stored on a Radiance Archive Tape (RAT). RAT data was used to derive a series of products, two of which are held here. Firstly, the LIMS Inverted Profile Archival Tape (LAIPAT). This dataset contains radiances (from RAT), which are used to derive daily inverted profiles of temperature, and mixing ratios, water vapour, nitric acid, and nitrogen dioxide. Profiles are geolocated. Secondly, the LIMS Map Archival Tape (LAMAT). This dataset is processed to create daily maps in the form of Fourier coefficients for each parameter at 18 pressure levels (from 0.05 to 100 mbar). Data are organised into 38 4 deg. latitude bands. Data for the daily maps are interpolated to the two synoptic time (0000 GMT for night and 1200 GMT for day). Also included is the day/night combined (averaged) data. This dataset is public. Please note that a major reprocessing of the Nimbus 7 LIMS data has recently been completed. The purpose of this activity is to take advantage of the changes in the spectral line parameters that have occurred since the original archived version was created and to generate a data version that is compatible with the UARS data sets. Improvements in the algorithm have also been made. More information is available from the LIMS homepage at http://lims.gats-inc.com/ and version 6 data can be downloaded from GES DAAC.

The 'Measurement of H2O Absorption Cross-Sections for the Exploitation of GOME’ project is a European Space Agency (ESA) funded study. The GOME and SCIAMACHY instruments are downward-viewing satellite-borne spectrometers that observe back-scattered solar radiation from the Earth's atmosphere. Global data on the distributions and vertical profiles of a large number of chemical species present in the atmosphere can be determined from the observations. Ozone distributions are a key measurement, but many other atmospheric gases and vapours involved in ozone chemistry and global climate change are also measured. Water vapour is of particular significance because it dominates the energy balance of the atmosphere. Also the spectrum of water vapour must be adequately understood and accounted for when deriving the concentration or distribution of trace atmospheric species. The dataset contains distributions and vertical profiles of atmospheric chemical species (in particular ozone) as well as the distribution of trace atmospheric species. This dataset is public.