Luftfremdstoffe / Umwelttechnik  
Immissionen / NABEL
Quellenzuordnung von Luftfremdstoffen
Atmosphärische Modellierung / Fernerkundung
Emissionen und Isotope
Laser Spektroskopie
Global Atmosphere Watch (GAW)
Klimagase

World Calibration Centre (WCC-Empa) for Surface Ozone, Carbon Monoxide, Methane and Carbon Dioxide

WCC-Empa was established in 1996, assuming worldwide responsibility for surface ozone, carbon monoxide and methane inter-comparisons at global GAW stations. In 2010, WCC-Empa was also assigned to extend its activities towards carbon dioxide.

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Mission statement for GAW activities at Empa

The goals of the WCC-Empa are

  • To ensure that measurements are fully traceable to the designated GAW reference
  • To assist stations with regards to instrument and/or measurement problems
  • To improve technical know-how at stations through on-site training
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Ozone, CO and CH4 traceability chain

through

  • Regular system and performance audits at global GAW stations including inter-comparison measurements with traveling standards.
  • Maintaining laboratory and traveling standards for surface ozone, carbon monoxide, methane and carbon dioxide.
  • Ensuring traceability of the WCC-Empa laboratory standards trough regular inter-comparisons with the corresponding GAW Central Calibration Laboratories.

 

WCC-Empa measurements are traceable to

  • NIST Standard Reference Photometer SRP#2 (surface ozone)
  • NOAA/ESRL WMO-2000 carbon monoxide scale
  • NOAA/ESRL NOAA04 methane scale
  • NOAA/ESRL WMO X2007 carbon dioxide scale

Achievements

Benefits of WCC-Empa audits include

  • Improved data quality
  • Increased data availability
  • Improved technical know-how of station operators
  • Increased awareness and acceptance of the GAW programme

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Global GAW stations audited by Empa-WCC

WCC-Empa Audits

Further Information
Please direct questions and/or comments about GAW activities of Empa to Brigitte Buchmann (Head of Departement), or Christoph Zellweger (WCC-Empa), or Martin Steinbacher (QA/SAC Switzerland).

 

more about...

Global Atmosphere Watch: Introduction

WCC-Empa (World Calibration Centre for Surface Ozone, Carbon Monoxide, Methane and Carbon Dioxide)

QA/SAC Switzerland (Quality Assurance/Scientific Activity Centre)

CATCOS webpage @ Empa

links

WMO

MeteoSwiss

GAWSIS (GAW Station Information System)

CATCOS Webpage @ MeteoSwiss

downloads

Questionnaire: Audit Gases

SOP: Audit Gases

GAW Report No. 213: 17th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques (GGMT-2013)

GAW Report No. 209: Guidelines for Continuous Measurements of Ozone in the Troposphere

GAW Report No. 192: Guidelines for the Measurement of Atmospheric Carbon Monoxide

GAW Report No. 172: Strategy for the Implementation of the Global Atmosphere Watch Programme, 2008-2015

GAW Report No. 166: Joint WMO-GAW / ACCENT Workshop on the Global Tropospheric Carbon Monoxide Observations Systems, Quality Assurance and Applications, EMPA, Dübendorf, Switzerland, 24-26 October 2005.  Editor: Jörg Klausen (WMO TD No. 1335)

GAW Report No. 143: Global Atmosphere Watch Measurements Guide

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