1. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
2. NOAA Aeronomy Laboratory; Boulder Colorado USA
3. Department of Ecology; Technical University of Munich; Freising-Weihenstephan Germany
4. NOAA Climate Monitoring and Diagnostics Laboratory; Boulder Colorado USA
5. Department of Environmental Sciences; University of Virginia; Charlottesville Virginia USA
6. NOAA Geophysical Fluid Dynamics Laboratory; Princeton New Jersey USA