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Methane Removal
Grantee Project

Chlorine Enhancement by Mineral Dust and its Effect on Methane: A Natural Experiment at the Cape Verde Observatory

Observational study quantifying the effect of mineral dust on methane oxidation

Lucy Carpenter

June 2025

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May 2027

Project Summary

A quantitative understanding of atmospheric Cl and of the Mineral Dust-Sea spray Aerosols (MDSA) mechanism is however inhibited by a lack of field observations.

Key goals:

  • Quantitatively evaluate the drivers of Cl production through field observations of speciated chlorine at the Cape Verde Observatory (CVO)
  • Robustly evaluate indirect field evidence for Cl enhancement
  • Determine whether the natural Cl sink of methane via the MDSA mechanism is effective
  • Improve knowledge of the potential impact of enhanced Cl levels from MDSA chemistry on methane, climate and air quality

The impact of mineral dust on methane oxidation has been modeled and there is early evidence of the mechanism from indirect measurements. This research will further explore the mechanism using a suite of measurements to explore its occurrence under different conditions and its impacts on local atmospheric chemistry.

Team

Lucy Carpenter is professor of physical chemistry at the University of York and director of the Cape Verde Atmospheric Observatory (CVAO). Her group studies the complex interaction between the oceans and the atmosphere, in particular the chemistry of reactive halogens, organic carbon, and reactive nitrogen. Her work on oceanic and atmospheric halogens has established this chemistry as an important component of tropospheric ozone cycling and makes use of gas chromatography–mass spectrometry (GCMS).

She helped establish the Cape Verde Atmospheric Observatory, one of a few dozen World Meteorological Organization (WMO) Global Atmosphere Watch (GAW) stations worldwide which monitor climate and air quality gases over long time scales, and was a lead chapter author of the WMO/United Nations Environment Programme (UNEP) 2014 scientific assessment of ozone depletion.

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Publications

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