You are in: Home » Science & Data » Standing Scientific Group on Physical Sciences » PACT
Polar Atmospheric Chemistry at the Tropopause (PACT) Action Group
A new Action Group, Polar Atmospheric Chemistry at the Tropopause (PACT), was formed by XXX SCAR in July 2008. Its aim is 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. PACT will produce a documented database consisting of the following information derived from existing high latitude ozonesonde measurements;
- High resolution profiles of ozone mixing ratio and partial pressure in the vicinity of the tropopause.
- The height of the chemical tropopause.
- Ten-day forward and backward trajectory information at selected potential temperature surfaces intersected by the ozonesonde profiles.
The specific information gathered by PACT will aid model studies of the UTLS region particularly validation of heating and cooling rates and trace gas transport fluxes. Data will be made available through the Australian Antarctic Data Centre and the International Global Radiosonde Archive (IGRA).
The group propose a timeline with production of data, a scientific publication and a report to SCAR to be completed by July 2010. The full proposal is available from SSG-PS.
For further information on the group, please visit the PACT Project website.
About Acrobat/PDF files