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Southern Ocean Atmospheric Photochemistry Experiment 2 (SOAPEX-2): Atmospheric Constituents Concentration Measurements from Cape Grim, Tasmania

Southern Ocean Atmospheric Photochemistry Experiment 2 (SOAPEX-2) is primarily an experiment to study atmospheric cleansing by free radicals in extremely clean and slightly perturbed tropospheric air and focuses on a field campaign carried out at Cape Grim, Tasmania in January-February 1999. The dataset contains concentrations of atmospheric constituents such as halocarbons, hydrocarbons, methane, nitric oxide, and carbon monoxide. This dataset is public.

Oxidation of almost all trace gases released into the atmosphere is initiated by hydroxyl (OH) radicals, produced mainly from the action of near-UV light on ozone in the presence of water vapour. Increasing evidence suggests that the oxidative capacity of the troposphere has been perturbed in recent years due to the emission of gases such as methane, carbon monoxide, non-methane hydrocarbons and nitrogen oxides from man-made sources. These perturbations may be causing changes in the natural atmospheric composition, for instance increasing tropospheric levels of the greenhouse gas ozone, which has important consequences for climate and human health. It is also possible that the rates of oxidation of gases such as methane, and production of sulphate aerosols from the oxidation of sulphur dioxide, have been modified. Taken together a change in the oxidative capacity of the atmosphere has many consequences for the long-term stability of the Earth's climate.

SOAPEX-2 builds upon the success of the original SOAPEX-I experiment conducted at Cape Grim in January/February 1995 which resulted in the publication of several papers to the literature on the relationship between concentrations of peroxy radicals and uv light levels in different NOx concentration regimes, and the consequences for ozone production and loss in the marine boundary layer. SOAPEX-2 is a more complete experiment with the addition of atmospheric measurements of key new species including hydroxyl, hydroperoxyl, halogen oxide and nitrate radicals, non methane hydrocarbons, speciated aldehydes, PAN and halocarbons.

SOAPEX-2 involves four groups of tropospheric scientists from the UK and Australia, namely the Universities of East Anglia, Leeds and Leicester along with CSIRO (Commonwealth Scientific Research Organisation), Melbourne.

The clean air photochemistry experiment is an essential prerequisite for experiments carried out in more polluted atmospheres. The data obtained is allowing rigorous testing of basic mechanisms which describe the behaviour of free radical concentrations at differing light levels, water vapour and nitrogen oxide concentrations, etc. The measurements performed in this project are expected to yield valuable information on chemical changes that are affecting the oxidative capacity of the global troposphere and, therefore, the rate at which the global atmosphere can cleanse itself of pollutants. The measurements are also highly relevant to the situation in more polluted atmospheres, where increased levels of confidence in our understanding of atmospheric chemistry is an essential prerequisite to any legislation designed to reduce regional and global pollution.

The specific objectives of SOAPEX-2 are:

* To quantitatively test fast photochemical theory in clean air.

* To examine perturbations from the baseline situation in polluted continental air containing more complex mixtures of free radical sources and sinks

* Investigation of the balance between tropospheric O3 production and destruction in differing NOx regimes

* A test of instrumental performance

* Testing of models used to simulate chemical processes in the lower atmosphere which are deficient in their description of boundary layer processes

Simple

Date (Publication)
1987-12-10T02:20:33
Date (Creation)
1987-12-10T02:20:33
Identifier
https://catalogue.ceda.ac.uk/uuid/a266f328ead407624dde4bb5c9e2e6a2
Identifier
NCAS British Atmospheric Data Centre (NCAS BADC) / a266f328ead407624dde4bb5c9e2e6a2
Author
  Unavailable - Allan, Beverly ( author )
Author
  Unavailable - Ayers, G. ( author )
Author
  Unavailable - Baker, Jon ( author )
Author
  Unavailable - Brough, N. ( author )
Author
  Unavailable - Carpenter, Lucy Jane ( author )
Author
  Unavailable - Creasey, David J. ( author )
Author
  Unavailable - Fraser, P. ( author )
Author
  Unavailable - Galbally, Ian ( author )
Author
  Unavailable - Gillett, R. ( author )
Author
  Unavailable - Heard, Dwayne E. ( author )
Author
  Unavailable - Kivlighon, Loretta ( author )
Author
  Unavailable - Kochhar, M. ( author )
Author
  Unavailable - Krummel, P. ( author )
Author
  Unavailable - Lee, James D. ( author )
Author
  Unavailable - Lewis, Alastair C. ( author )
Author
  Unavailable - Meyer, M. ( author )
Author
  Unavailable - Mills, Graham ( author )
Author
  Unavailable - Monks, Paul S. ( author )
Author
  Unavailable - Pilling, Michael J. ( author )
Author
  Unavailable - Salisbury, Gavin ( author )
Author
  Unavailable - Steele, P. ( author )
Author
  Unavailable - Sturrock, Georgina ( author )
Author
  Unavailable - Weeks, Ian ( author )
Custodian
  NCAS British Atmospheric Data Centre (NCAS BADC) - custodian
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
Distributor
  NCAS British Atmospheric Data Centre (NCAS BADC) - distributor
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
pointofContact
  NCAS British Atmospheric Data Centre (NCAS BADC) - point_of_contact
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
Publisher
  NCAS British Atmospheric Data Centre (NCAS BADC) - publisher
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
Maintenance and update frequency
unknown Unknown
Update scope
series Series
Keywords
  • SOAPEX-2
  • air pollution
  • in-situ
  • airborne
  • ship
  • balloon
GEMET - INSPIRE themes, version 1.0
  • atmospheric conditions
Access constraints
otherRestrictions Other restrictions
Other constraints
Please contact the data centre for assistance on accessing data from this dataset collection.
Use constraints
otherRestrictions Other restrictions
Other constraints
Under the following licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/, appropriate use of these data may fall under any use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Spatial representation type
grid Grid
Metadata language
EnglishEnglish
Topic category
  • Climatology, meteorology, atmosphere
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Begin date
1999-01-01T00:00:00
End date
1999-02-28T00:00:00
Unique resource identifier
WGS 84
Distribution format
  • Contact data centre for format details. ()

Distributor
  NCAS British Atmospheric Data Centre (NCAS BADC) - Data Center Contact
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
OnLine resource
CEDA Data Catalogue Page

Detail and access information for the resource

OnLine resource
Methodology and Approach

No further details.

OnLine resource
BADC Doc: SOAPEX Photo Gallery

No further details.

OnLine resource
Taking the air CSIRO Publication on SOAPEX

No further details.

Hierarchy level
series Series

Conformance result

Date (Publication)
2010-12-08
Statement
Please see data lineage statements for each dataset within this collection for data lineage details.
File identifier
a266f328ead407624dde4bb5c9e2e6a2 XML
Metadata language
EnglishEnglish
Character set
8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 UTF8
Hierarchy level
series Series
Hierarchy level name
series
Date stamp
2025-11-15T03:26:30
Metadata standard name
UK GEMINI
Metadata standard version
2.3
Point of contact
  NCAS British Atmospheric Data Centre (NCAS BADC)
British Atmospheric Data Centre , STFC Rutherford Appleton Laboratory , Harwell Oxford , OX11 0QX , UK
+44(0)1235 446432
 
 

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Spatial extent

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Keywords

GEMET - INSPIRE themes, version 1.0
atmospheric conditions

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