2f3b6b38b25d408db4cb8e6fd06d8aeb English 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 7ca95b35d9e378c10343f2730a880549 dataset NCAS British Atmospheric Data Centre (NCAS BADC) +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk pointOfContact 2026-05-06T02:11:35 UK GEMINI 2.3 WGS 84 MRF A751 ACTO flight: Airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft 2006-12-10T03:09:18 publication 2006-12-10T03:09:18 creation https://catalogue.ceda.ac.uk/uuid/2f3b6b38b25d408db4cb8e6fd06d8aeb 2f3b6b38b25d408db4cb8e6fd06d8aeb NCAS British Atmospheric Data Centre (NCAS BADC) The Meteorological Research Flight (MRF) was a Met Office facility, which flew a well-instrumented C-130 Hercules aircraft for atmospheric research purposes. This dataset contains airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft flight A751 for the Atmospheric Chemistry and Transport of Ozone in the upper troposphere-lower stratosphere (UTLS) (ACTO) campaign. The flight was a transit from Boscombe to Prestwick. The main purpose was to investigate a filament of air (with UTLS origins), which had been apparent on the PV forecasts from ECMWF (interpretation by John Methven). The flight was very successful. In particular, the filament of air was located with relative ease. The filament was initially traversed during the ascent to the first level run. The filament position was then confirmed from the water vapour image, details of which were sent to the aircraft via satcom. A rectangular flight plan was carried out at FL230, with legs approximately along the axis of the filament, across the filament and along the outside of the filament. A triangular pattern was flown at the subsequent level, with the final leg running at a slight angle across the filament, such that the edge of the filament was crossed slowly. The filament was apparent in many of the measurements: low humidity, low CN, high ozone (up to around 100ppb), higher PCASP aerosol and high NOy. Other features were apparent near the filament region including air parcels having some evidence of more recent pollution (higher NO and NO2). Hence, further investigation will be required to understand the origins of these parcels. A number of flask samples (37) were also collected for subsequent analysis, There were a few instrument errors prior to flight. The CO and the HCHO were both unserviceable and the FWVS was not fitted. It is hoped that some of the other parameters may be used as tropospheric tracers instead of CO (aerosols, Leeds GC hydrocarbons, bottle sample-hydrocarbons (including methane), bottle sample GC-MS analysis and possible bottle sample CO). Meteorology The meteorological situation was dominated by a large ridge of high pressure, stretching from the Azores to Scandinavia. A weak warm front was analysed on the midday Met. Office Chart, oriented from SW to NE, stretching from 50N, 15W to Scandinavia. There was little cloud associated with the front: mainly a line of stratocumulus with some embedded cumulus (the largest having tops at 25,000ft). The main features appeared to be marked by a gradient in humidity, which was apparent on the water vapour satellite image. " Met Office author 0370 900 0100 Met Office FitzRoy Road Exeter EX1 3PB enquiries@metoffice.gov.uk author Barjat, Hannah Unavailable author Unavailable author Brough, Neil Unavailable author Unavailable author Penkett, Stuart A. Unavailable author Unavailable author Carney, R. Unavailable author Unavailable author Lewis, Alastair C. Unavailable author Unavailable author Methven, John Unavailable author Unavailable author McQuaid, Jim Unavailable author Unavailable author Phillips, G.J. Unavailable author Unavailable author Purvis, Ruth Mary Unavailable author Unavailable author Reeves, Claire E. Unavailable author Unavailable author NCAS British Atmospheric Data Centre (NCAS BADC) custodian +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk custodian NCAS British Atmospheric Data Centre (NCAS BADC) distributor +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk distributor Penkett, Stuart A. Unavailable principal_investigator Unavailable principalInvestigator NCAS British Atmospheric Data Centre (NCAS BADC) point_of_contact +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk pointofContact NCAS British Atmospheric Data Centre (NCAS BADC) publisher +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk publisher notPlanned dataset UTLS ACTO Chemistry temperature pressure wind atmospheric conditions theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication otherRestrictions Access to these data is available to any registered CEDA user. Please Login or Register for a CEDA account to gain access. otherRestrictions Under the following licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/, appropriate use of these data may fall under any use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. grid English climatologyMeteorologyAtmosphere -4.6142 -1.837 50.7247 55.508 2000-05-07T10:41:30 2000-05-07T15:00:00 Data are ASCII formatted NCAS British Atmospheric Data Centre (NCAS BADC) Data Center Contact +44(0)1235 446432 British Atmospheric Data Centre STFC Rutherford Appleton Laboratory Harwell Oxford OX11 0QX UK badc@rl.ac.uk distributor https://catalogue.ceda.ac.uk/uuid/2f3b6b38b25d408db4cb8e6fd06d8aeb CEDA Data Catalogue Page Detail and access information for the resource information http://data.ceda.ac.uk/badc/ukmo-mrf/data/a751 DOWNLOAD Download Data download dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 Data collected by instruments on-board the MRF C-130 during flight A751. Data acquired by BADC for archiving during the ACTO project.