CMP6 – Improving the analysis of methane sources and sinks over the last decade and preparing for future monitoring

This Component contributes to the development of the global observing system of methane and provides a synthesis of the global methane cycle. Various streams of data will be brought together including in-situ concentration and flux measurements, and remote sensing derived soil moisture, flooded area and methane concentrations. The information from these measurements will be integrated using 2 independent data assimilation systems and land surface models of wetland CH4 emissions. Special emphasis will be on the use of CH4 measurements from satellite instruments. An assessment will be made of how to optimally combine remote sensing and in-situ measurements in an internally consistent data assimilation framework.

From the results of our global CH4 data assimilation system a synthesis of the global methane cycle will be derived for the last decade, including an assessment of uncertainties at different levels of the data processing chain. The performance of the global methane observing system will be evaluated and recommendations will be made for the future.

The specific objectives of this Component are:

  • Development of the global observing system of methane.
  • Integration and synthesis of the available measurements and emissions estimates, with special focus on emissions from natural wetlands.
  • Assessment of global methane sources and sinks and their variations in recent years.
  • Assessment of the added value of CH4 measurements from the current generation of satellite instruments.
  • Uncertainty assessment, focusing on the uncertainty of atmospheric transport models and process-based models of methane emissions from natural wetlands.
  • Strength-weakness analysis of the current observing system and identification of needs and directions for future development.

All these objectives will be linked and embedded in the frame of the GEO 2012-2015 Work Plan.