THAW - Temperature, Humidity and Winds near the Tropopause
THAW is a proposal for flights in the tropopause region, its scientific objectives are to:
• Measure fine-scale vertical temperature structure in the vicinity of the tropopause, to test a model for VHF radar
reflection being developed at Manchester.
• Compare wind and turbulence measurements with the MST radar, to better enable quantitative derivation of turbulence parameters from
the radar echo spectra.
• Characterise the performance of the Buck research CR-2 hygrometer in the upper troposphere, with special emphasis on measuring supersaturation in the vicinity of the cirrus clouds.
Availability of data
Data from THAW will be stored and available through the THAW archive directory. This will include links to the
relevant FAAM flights stored in the FAAM archive and links to appropriate MST data in the MST archive, as well as any data collected by other instruments.
The data can be be viewed and downloaded by authorised users (see below). FAAM data includes both core and non-core data (for a definition of
core data, see the document on
Access to THAW FAAM data is determined by the THAW Conditions of Use,
- processed core data is publicly available upon ageement with the FAAM Data Protocol (online application required).
- non-core data collected on board the FAAM aircraft will be restricted to THAW participants for 18 months 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, and NERC and the Met Office in any publication based on THAW data.
If you are an THAW participant and wish to access the THAW FAAM data whilst it is restricted, please follow the guidelines below.
- 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 firstname.lastname@example.org;
for access to the THAW data you will be asked to abide
by the THAW Conditions of Use and the FAAM Conditions of Use
Whilst convenient links are provided to the MST data associated with the THAW flights, the standard MST conditions of use apply and applications should be made
in the usual way. Please see the MST radar web page for more details and
APPLY for access to MST radar data.
Data format, File names and Instructions to data providers
THAW data are stored in either
NASA Ames format.
File names follow the BADC
file name convention.
Data file submission.
Data providers are kindly requested to follow the BADC
file name convention and to format your data in
using the CF metadata conventions.
NASA Ames formatted files are also
If you wish to check that files are correctly formatted before uploading them
please use the
NetCDF format checker or the BADC
It is important that the data be well documented.
Please follow the BADC guidelines regarding the submission of
- Core data and Met Office-non-core instrument data will be submitted though the usual upload routes.
- Other non-core data can be submitted by FTP to ftp.badc.rl.ac.uk directory incoming/thaw.
You will need your BADC user name and password and have applied and been granted access to THAW data as directed above.
Links to further information
FAAM, UK Meteorological Office, Natural Environment Research Council,[Forster P.]. FAAM - Temperature, Humidity and Winds near the Tropopause (THAW), [Internet]. British Atmospheric Data Centre, 2009-, Date of citation. Available from http://badc.nerc.ac.uk/data/thaw/.
Who to contact