Workshop on “Solving the Mystery of Carbon Tetrachloride” in Zurich, 5-6 Oct 2015

Abstract submission deadline: 27 July 2015, Registration deadline: 24 Aug 2015


Carbon tetrachloride (CCl4 or CTC) is a major ozone-depleting substance and greenhouse gas. However, estimated CTC sources and sinks are inconsistent with abundance observations. Recent work suggests that there is a large unknown CTC source of about 39 Gg yr-1 and a 35-year lifetime. This workshop’s purpose is to bring together science, industry, and technology experts to exchange information and to coordinate research activities across disciplines for fully closing the CTC budget.
This workshop will involve solicited and submitted presentations related to all aspects
of the CTC problem.


1. Emissions or Sources:

  • CTC consumption and production for both historic and current usage
  • CTC feedstock usage, and potential fugitive emissions
  • Legacy emissions from brown-field sites
  • Top-down global and regional emissions estimate for CTC

2. Loss Processes: Photochemical, ocean, and soil losses of CTC

3. Observations: CTC measurements from ground stations, aircraft, balloon, satellite,
and ships to constrain the CTC budget

4. Modeling: Reconciling the emission and loss processes of CTC with observations in a global modeling perspective

The outcome of the workshop will be summarized in the SPARC newsletter. We will strongly encourage all participants to reformulate their presentations into written papers. From these presentation and papers, we plan to organize a peer-reviewed special issue on all aspects of the CTC problem.


27 July 2015: Abstract Deadline.

24 August 2015: Registration Deadline.

5-6 October 2015: Workshop

Organizing Committee:

Stefan Reimann (Empa, Switzerland), Paul Newman (NASA, USA),
Qing Liang (USRA/NASA, USA)

For more information on this SPARC activity, please visit the following link at: