Tropospheric ORganic CHemistry Experiment (TORCH) was a Natural Environment Research Council (NERC) Polluted Troposphere Research Programme project (Round 1 - NER/T/S/2002/00145. Duration 2002 - 2005) led by A. Lewis, University of York. TORCH 1 took place in July and August 2003 at Writtle College, near Chelmsford, Essex. This dataset contains relative humidity measurements from the University of Leicester's Rotronic MP103A temperature sensor.

The THAW (Temperature, Humidity and Winds near the Tropopause) project was led by Prof. Geraint Vaghaun (NCAS, University of Manchester) utilising a combination of vertically pointing Doppler radar data from the MST radar near Aberystwyth and a series of radiosonde and research aircraft flights in the tropopause region. The project used the FAAM BAE 146 aircraft 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. The MST radar was operated in two modes during this period with higher vertical resolution measurements at 150 m resolution interspersed with the 300 m vertical resolution data - these are available in the standard MST radar version 3 dataset linked within this collection.

Tropospheric ORganic CHemistry Experiment (TORCH) was a Natural Environment Research Council (NERC) Polluted Troposphere Research Programme project (Round 1 - NER/T/S/2002/00145. Duration 2002 - 2005) led by A. Lewis, University of York. TORCH 2 took place in April and May 2004 at Weybourne Atmospheric Observatory, on the north Norfolk coast. This dataset contains temperature, relative humidity, wind speed and wind direction measurements taken using Campbell Scientific basic weather station.

Tropospheric ORganic CHemistry Experiment (TORCH) was a Natural Environment Research Council (NERC) Polluted Troposphere Research Programme project (Round 1 - NER/T/S/2002/00145. Duration 2002 - 2005) led by A. Lewis, University of York. TORCH 1 took place in July and August 2003 at Writtle College, near Chelmsford, Essex. This dataset contains temperature, relative humididty, wind speed and wind direction measurments taken using Campbell Scientific basic weather station