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Dataset Collection

 
Facility for Airborne Atmospheric Measurements (FAAM) Logo

Facility for Airborne Atmospheric Measurements (FAAM) Aircraft Data for the Continuum Absorption in the Visible and Infrared and its Atmospheric Relevance (CAVIAR) project

Status: Not defined
Publication State: published

Abstract

The Continuum Absorption in the Visible and Infrared and its Atmospheric Relevance (CAVIAR) campaign will use instruments on board the Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft to determine the strength and temperature dependence of the water vapour continuum over a range of wavelengths. In doing so, the aim is to determine whether water vapour dimers, or the far wings of monomer lines, or a combination of both, are responsible for the continuum absorption, and put the continuum on a more secure theoretical footing.

Citable as:Facility for Airborne Atmospheric Measurements; Met Office; Natural Environment Research Council; Taylor, J.; Shine, K.P. (2008): Facility for Airborne Atmospheric Measurements (FAAM) Aircraft Data for the Continuum Absorption in the Visible and Infrared and its Atmospheric Relevance (CAVIAR) project. NCAS British Atmospheric Data Centre, date of citation. http://catalogue.ceda.ac.uk/uuid/6278b0a406d541ec7c2fb04654f37386
Abbreviation: caviar
Keywords: Not defined

Details

Previous Info: No news update for this record
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More Information (under review)


Introduction

The FAAM (Facility for Airborne Atmospheric Measurements) puts at the scientists' disposal a large atmospheric research aircraft (the BAE-146-301 aircraft) through a scheme of project selection and combined funding. It is run jointly by NERC and by the UK Met Office, and is one of the NERC Centres for Atmospheric Science (NCAS). The BADC is the FAAM designated data centre.

The CAVIAR campaign will use instruments on board the FAAM BAe-146 aircraft to determine the strength and temperature dependence of the water vapour continuum over a range of wavelengths. In doing so, the aim is to determine whether water vapour dimers, or the far wings of monomer lines, or a combination of both, are responsible for the continuum absorption, and put the continuum on a more secure theoretical footing.

The measurements will be co-ordinated with infrared ground-based sun-pointing Fourier Transform Spectrometer (FTS) observations by the National Physical Laboratory at Camborne (UK) and Jungfraujoch (Switzerland). The choice of locations has been made to enable this ground-based instrumentation to observe under very different conditions of total column water vapour, as this will allow study of different parts of the infrared spectrum.

The campaign will be part of a large consortium which includes theoretical studies of the water dimer, FTS and Cavity Ring Down measurements of continuum absorption in the laboratory and modelling studies of the impact of the continuum on the Earth's radiation budget for present day and possible future climates.


Access Restrictions

As stated in the CAVIAR Conditions of Use, access to the BAe-146 data is restricted to CAVIAR participants and to Met Office aircraft group members:

  • processed core data is restricted for one year after measurement and also ruled by the FAAM Data Protocol.
  • non-core data collected on board the FAAM aircraft will be restricted to CAVIAR participants and to Met Office aircraft group members for 2 years after measurement, after which the data will be released to the public domain.
  • Access to the BAe-146 raw-core data is restricted to FAAM staff.

All users are requested to acknowledge the data providers in any publication based on CAVIAR data.

If you are an CAVIAR participant and wish to access the CAVIAR data whilst it is restricted, please follow the guidelines below.
  1. register as a BADC user — if you are already a registered BADC user, skip this step; if you have forgotten your BADC user ID and/or password, please contact the BADC helpdesk at badc@rl.ac.uk;
  2. apply for access to the CAVIAR data — you will be asked to abide by the CAVIAR Conditions of Use and the FAAM Conditions of Use

If you are a member of the Met Office Aircraft users group you will already have access to this data and need not apply above.

For more details on FAAM data restrictions, please see the FAAM Data Access Rules.


Data availability and file format

BADC will store data from the FAAM BAe-146 aircraft supplied by the CAVIAR project team in the BADC FAAM archive, from where they can be viewed and downloaded by authorised users (see below). These data include both core and non-core data (for a definition of core data, see the document on FAAM Instruments).

FAAM processed core data are stored in NetCDF. Processed non-core data are stored in NetCDF or NASA Ames. Raw core data are stored in zipped VMS files. Some software to read, manipulate and convert these formats into each other are provided by the BADC (software directory in the FAAM archive) or other agencies.

CAVIAR data are stored in either NetCDF or NASA Ames format.

File names follow the BADC file name convention and (for FAAM data) the FAAM file name convention.


Services to CAVIAR Campaign participants

  • A secure project workspace, accessible by FTP, has been set up for use by CAVIAR participants to facilitate the exchange of documents and preliminary data files. Please note this is separate from the data archive and validated, formatted data files should be subsequently be submitted to the ARCHIVE in the normal way.

    To gain access the FTP-project-space you will need to be registered with BADC (See 1 above) and

    The workspace can then be accessed by FTP to proj-ftp.ceda.ac.uk directory project_spaces/caviar_ps. For help with FTP see the BADC FTP guide. Access to view and download files may be obtained via your web browser using the URL ftp://username@proj-ftp.ceda.ac.uk (you will be prompted for your password) however to upload files you will need an FTP client.

  • CAVIAR Data Providers Guide to submit data to the BADC Archive.
  • BADC NASA-Ames file checker
  • BADC NetCDF file checker

Documentation

Links to further information

References

A list of publications is available from the CAVIAR Project Homepage.

Who to contact

Coverage
Temporal Range
Start time:
2008-08-13T07:32:50
End time:
2012-08-10T13:39:29
Geographic Extent

 
53.4156°
 
-7.6254°
 
8.5790°
 
43.9365°