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Dataset

 

MRF A751 ACTO 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 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. "

Citable as:  Met Office; Barjat, H.; Brough, N.; Penkett, S.A.; Carney, R.; Lewis, A.C.; Methven, J.; McQuaid, J.; Phillips, G.J.; Purvis, R.M.; Reeves, C.E. (2006): MRF A751 ACTO 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/2f3b6b38b25d408db4cb8e6fd06d8aeb
Abbreviation: Not defined
Keywords: UTLS, ACTO, Chemistry, temperature, pressure, wind

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
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 A751. Data acquired by BADC for archiving during the ACTO project.

Data Quality:
unknown.
File Format:
Data are ASCII 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: Penny and Giles E23001 Deployed on: Met Office C-130 Hercules Aircraft
MRF: JNO2 radiometers Deployed on: Met Office C-130 Hercules Aircraft
MRF: Total Water Content (TWC) probe Deployed on: Met Office C-130 Hercules Aircraft
MRF: Condensation Nucleus Counter Model 3025A Deployed on: Met Office C-130 Hercules Aircraft
MRF: ROSEMOUNT 1201F Deployed on: Met Office C-130 Hercules Aircraft
MRF: NowStar XR5 GPS Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - De-iced (Rosemount 102BL) and non de-iced (Rosemount 102AL) temperature sensors Deployed on: Met Office C-130 Hercules Aircraft
MRF: TECO 49 UV photometric ozone instrument Deployed on: Met Office C-130 Hercules Aircraft
MRF: Cloud Physics Deployed on: Met Office C-130 Hercules Aircraft
MRF: In Cloud Temperature probe 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 - Aethalometer - Particle Soot AbsorptionPhotometer (PSAP) Deployed on: Met Office C-130 Hercules Aircraft
MRF - C-130 - Carbon Monoxide monitor (CO) instrument Deployed on: Met Office C-130 Hercules Aircraft
MRF: Johnson-Williams Liquid Water Content Meter 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 - C-130 - PAN gas chromatograph Deployed on: Met Office C-130 Hercules Aircraft
UEA: Peroxides instrument Deployed on: Met Office C-130 Hercules Aircraft
MRF- C-130 - Fast Forward Scattering Spectrometer Probe (FFSSP) Deployed on: Met Office C-130 Hercules Aircraft
MRF: Entech-GC-MS Deployed on: Met Office C-130 Hercules Aircraft
MRF: PTV-GC-FID Deployed on: Met Office C-130 Hercules Aircraft

Mobile platform operations

Mobile Platform Operation 1 MRF Flight C-130 A751
Output Description None

No variables found.

Coverage
Temporal Range
Start time:
2000-05-07T10:41:30
End time:
2000-05-07T15:00:00
Geographic Extent

 
55.5080°
 
-4.6142°
 
-1.8370°
 
50.7247°