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Dataset

 

MRF A773 EXPORT flight: Airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2006-12-10
Download Stats: last 12 months

Abstract

The primary objective of the European eXport of Precursors and Ozone by long-Range Transport (EXPORT) project is to characterise and quantify the photochemical air pollution both forming over Europe and being exported eastwards from Europe. The data held at BADC was collected during a co-ordinated 3 aircraft flying campaign in August 2000 based at Oberpfaffenhofen in Southern Germany. Measurements were made of many photochemical parameters including ozone, its precursors, other oxidants and both gas phase and particulate tracers in the air over Europe and that being transported eastwards out of Europe.

This dataset contains airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft flight A773 for the EXPORT project. The flight was over southern and eastern Germany.

Transport of Pollution through a Warm Conveyor Belt

From Oberpfaffenhofen the route was first to the far SW of Germany. However, in order to avoid the worst of the cloud (for the NOxy calibration) some retracing of our steps was required. Once at the south western waypoint, the plan was then to cross the front in a square wave pattern, travelling in a north eastern direction and increasing in altitude between runs. This was carried out successfully. We remained within the belt of cloud for much of the flight.

The flight appears to have been rather successful. Certainly transport of CO, HCHO, NOx and NOy (including PAN), out of the boundary layer, was very clear. The highest CO mixing ratios (ca. 150 ppb) were found at around 10:40 during a run at FL100. PAN at this time was estimated to be nearly 1 ppb. The following runs at FL120 and FL140 also showed elevated CO etc but CO maxima decreased with altitude. Whether all of the transport was due to the conveyor or if some of it was due to convection remains to be seen. The mixing ratio of ozone throughout the cloudy region was fairly constant (around 50 - 60 ppb); indicating that there had been limited photochemical processing.

Once clear of the northern edge of the cloud, the aircrew carried out a 50ft approach to an airfield in Leipzig. This allowed sampling of the boundary layer in the region and was quite a contrast to the rest of the flight. High SO2 readings (ca. 2 ppb) and high NOx readings (TECO NOx ca. 18 ppb) were observed but it should be noted that these were not concurrent: the maximum in NOx following that in SO2 by ca. 5 mins. During this time period the CN was off scale (the CO peaked at around 200 ppb and ozone was reduced to around 30ppb). The high concentrations of primary pollutants were unsurprising given the observation of large industrial chimneys etc in the area.

There were a fair number of instrument problems. The lower jNO2 and jO1D radiometers were found to go to full-scale for short periods. The HORACE TAS and TAT were clearly erroneous for a period of around half-an-hour starting at around 9:45 GMT. The flow in the PSAP instrument could not be maintained and missing 'O' rings needed replacing at the beginning of the flight. The FWVS was also found to drop down to -70.5°C fairly regularly. Early problems with the CO instrument (blown fuse) were soon rectified. All other chemistry equipment appeared to work well, despite the very wet conditions.

The Met Office midday analysis showed the surface cold front stretching from Northern France to the triple point at the Baltic Sea. The path across Germany was fairly closely matched by the flight plan.

Citable as:  EXPORT campaign participants; Met Office; Bandy, B.; Brough, N.; Carney, R.; Green, T.; Kent, J.; Lewis, A.C.; McQuaid, J.; Mills, G.; Oram, D.; Phillips, G.J.; Purvis, R.M.; Sturrock, G. (2006): MRF A773 EXPORT flight: Airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft. NCAS British Atmospheric Data Centre, date of citation. https://catalogue.ceda.ac.uk/uuid/a61e04ec5b3d480bbfdeb375b4f29f82
Abbreviation: Not defined
Keywords: EXPORT, C-130

Details

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Previously used record identifiers:
No related previous identifiers.
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Use of these data is covered by the following licence: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data collected by instruments on-board the MRF C-130 during flight A773. Data acquired by BADC for archiving during the EXPORT project.

Data Quality:
Unknown
File Format:
Data are NASA Ames formatted

Related Documents

No documents related to this record were found.

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Instrument/Platform pairings

MRF - C-130 aircraft in-situ Instrumentation Deployed on: Met Office C-130 Hercules Aircraft
University of Leeds: GC-FID Deployed on: Met Office C-130 Hercules Aircraft
UEA: PEroxy Radical Chemical Amplification (PERCA) technique Deployed on: Met Office C-130 Hercules Aircraft
Leicester: Spectral Radiometer j(O1D) Deployed on: Met Office C-130 Hercules Aircraft
Met Office - Lyman-Alpha Hygrometer Deployed on: Met Office C-130 Hercules Aircraft
FAAM/BAE systems or other aircraft: Flight log Deployed on: Met Office C-130 Hercules Aircraft
UEA: Peroxides instrument Deployed on: Met Office C-130 Hercules Aircraft
FAAM/BAE systems or other aircraft: Flight summary Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - 2D-C instrument Deployed on: Met Office C-130 Hercules Aircraft
MRF: In Cloud Temperature probe Deployed on: Met Office C-130 Hercules Aircraft
MRF: Condensation Nucleus Counter Model 3025A Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - PAN gas chromatograph Deployed on: Met Office C-130 Hercules Aircraft
MRF: Johnson-Williams Liquid Water Content Meter Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - Passive Cavity Aerosol Spectrometer Probe (PCASP) Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - UV Absorption instrument Deployed on: Met Office C-130 Hercules Aircraft
Fast Forward Scattering Spectrometer Probe (PMS canister instrument) Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - Aethalometer - Particle Soot AbsorptionPhotometer (PSAP) Deployed on: Met Office C-130 Hercules Aircraft
UEA: NOxy 4 channel NO, NO2, NOy, NOy* chemiluminescence analyser Deployed on: Met Office C-130 Hercules Aircraft
MRF: Fluorescence water vapour sensor Deployed on: Met Office C-130 Hercules Aircraft
UEA: Formaldehyde (HCHO) instrument or Fluorometric Deployed on: Met Office C-130 Hercules Aircraft

Mobile platform operations

Mobile Platform Operation 1 MRF Flight C-130 A773
Output Description None
  • long_name: Air Temperature
  • gcmd_keyword: Air Temperature
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0027
  • names: Air Temperature, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0027
  • long_name: Carbon And Hydrocarbon Compounds
  • names: Carbon And Hydrocarbon Compounds
  • long_name: Carbon Monoxide
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0112
  • gcmd_keyword: Carbon Monoxide
  • names: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0112, Carbon Monoxide
  • gcmd_keyword: Deiced Temperature
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0201
  • long_name: Deiced Temperature
  • names: Deiced Temperature, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0201
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0210
  • gcmd_keyword: Dew Point Temperature
  • long_name: Dew Point Temperature
  • names: Dew Point Temperature, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0210
  • long_name: Geopotential Height
  • gcmd_keyword: Geopotential Height
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0341
  • names: Geopotential Height, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0341
  • long_name: Height From Radar Data
  • names: Height From Radar Data
  • gcmd_keyword: EARTH SCIENCE > Atmosphere > Atmospheric Water Vapor > Humidity
  • long_name: Humidity
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G239
  • names: http://vocab.ndg.nerc.ac.uk/term/P041/4/G239, EARTH SCIENCE > Atmosphere > Atmospheric Water Vapor > Humidity
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0391
  • gcmd_keyword: Hydrostatic Pressure
  • long_name: Hydrostatic Pressure
  • names: Hydrostatic Pressure, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0391
  • long_name: J(NO2)
  • alt_names: ['Reaction rate of NO2']
  • names: Reaction rate of NO2
  • long_name: J(O1D)
  • alt_names: ['Reaction rate of O1D']
  • names: Reaction rate of O1D
  • long_name: Methane
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G138
  • gcmd_keyword: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Methane
  • names: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Methane, http://vocab.ndg.nerc.ac.uk/term/P041/4/G138
  • gcmd_keyword: Non-methane Hydrocarbons
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0563
  • long_name: Non-methane Hydrocarbons
  • names: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0563, Non-methane Hydrocarbons
  • long_name: Oxygen Compounds
  • names: Oxygen Compounds
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G164
  • gcmd_keyword: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Oxygen Compounds > Ozone
  • long_name: Ozone
  • names: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Oxygen Compounds > Ozone, http://vocab.ndg.nerc.ac.uk/term/P041/4/G164
  • long_name: Peroxide
  • names: Peroxide
  • long_name: Peroxy Radicals
  • names: Peroxy Radicals
  • long_name: Peroxyacetyl Nitrate (PAN)
  • names: Peroxyacetyl Nitrate (PAN)
  • gcmd_keyword: Photolysis Rates
  • long_name: Photolysis Rates
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0625
  • names: Photolysis Rates, http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0625
  • long_name: Trace Gases
  • names: Trace Gases
  • long_name: Trace Species
  • names: Trace Species
  • gcmd_keyword: Volatile Organic Compounds
  • long_name: Volatile Organic Compounds
  • gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0928
  • names: http://vocab.ndg.nerc.ac.uk/term/P141/4/GVAR0928, Volatile Organic Compounds

Co-ordinate Variables

Coverage
Temporal Range
Start time:
2000-08-02T07:27:45
End time:
2000-08-02T13:30:55
Geographic Extent

 
50.0000°
 
6.0000°
 
13.0000°
 
48.0000°