1. National Center for Atmospheric Research; Boulder Colorado USA
2. Now at Science Systems and Applications, Inc.; Lanham Maryland USA
3. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics; Chinese Academy of Sciences; Beijing China
4. Goddard Earth Sciences and Technology Center; University of Maryland Baltimore County; Baltimore Maryland USA
5. GRUAN Lead Center; Meteorologisches Observatorium; Lindenberg Germany