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Polar Atmospheric Chemistry at the Tropopause (PACT)

Polar Atmospheric Chemistry at the Tropopause (PACT) aims to improve understanding of the distribution and variability of ozone in the polar upper troposphere – lower stratosphere (UTLS) region and the feedbacks of ozone changes to polar climate. 

Recently PACT work as focussed on finalising a database on tropopause region parameters that is being derived using all available ozonesonde measurements poleward of 50° latitude. The ozonesonde data have been obtained from the World Ozone and Ultraviolet Radiation Data Centre (WOUDC; http://www.woudc.org/), the Network for the Detection of Atmospheric Composition Change (NDACC; http://www.ndsc.ncep.noaa.gov/sites/) and the National Oceanic and Atmospheric Administration’s Earth System Research Laboratory (http://www.esrl.noaa.gov/gmd/ozwv/ozsondes/index.html). The earliest data currently used are from Syowa in Antarctica (1966), although the majority of information comes from the 1990s and later years.

Documentation and data are available from the PACT web site at the Australian Antarctic Data Centre Data Centre (http://data.aad.gov.au/aadc/pact/).

Further information may be obtained from the PACT website.

Terms of Reference

The goal of PACT is to provide a unique and convenient set of observational data and analyses derived from high-latitude ozonesonde measurements to help improve understanding of the distribution and variability of ozone in the extratropical tropopause region and the feedbacks of ozone change to polar climate.

For further information see the PACT website.