All scientific data collected by the Australian Antarctic program (AAp) are eventually described in the Catalogue of Australian Antarctic and Subantarctic Metadata (CAASM). CAASM can be used to search through AAp data descriptions, and it also provides links to access publicly available datasets, which can either be immediately downloaded or obtained from the Australian Antarctic Data Centre (AADC).
PACT is a scientific research Action Group project of the Scientific Committee on Antarctic Research (SCAR; http://www.scar.org/), conducted under the Standing Scientific Group on Physical Sciences (SSG-PS; http://www.scar.org/researchgroups/physicalscience/ ). It is a specialised project for scientific workers in the fields of atmospheric and climate research.
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
PACT will produce a documented database consisting of the following information derived from existing high latitude ozonesonde measurements;
1. High resolution profiles of ozone mixing ratio and partial pressure in the vicinity of the tropopause.
2. The height of the chemical tropopause.
3. Ten-day forward and backward trajectory information at selected potential temperature surfaces intersected by the ozonesonde profiles.
4. Other relevant diagnostic information derived from radiosonde measurements and data assimilations (including lapse rate tropopause location, and interpolated potential vorticity and potential temperature associated with the ozonesonde measurements).
The specific information gathered by PACT is aimed to help model studies of the UTLS region particularly the validation of heating and cooling rates and the transport fluxes of trace gases. Data will be made available through the Australian Antarctic Division (AAD) and the Integrated Global Radiosonde Archive (IGRA; https://www.ncdc.noaa.gov/data-access/weather-balloon/integrated-global-radiosonde-archive).
PACT data may be useful in the following studies:
Radiative and chemical processes in the tropopause region.
Trace gas transport and exchange between the troposphere and stratosphere.
Long-term changes and variability in the structure and composition of the lower atmosphere.
Feedbacks of climate change.
Validation of coupled chemistry-climate models and atmospheric measurements.
Copies of documentation supporting the project are available for download from the provided URL. Data are not yet available.
This data set conforms to the CCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=PACT when using these data.