1. Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering; Washington State University; Pullman Washington USA
2. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences; Lanzhou University; Lanzhou China
3. Bayreuth Center of Ecology and Environmental Research; University of Bayreuth; Bayreuth Germany
4. National Center for Atmospheric Research/EOL; Boulder Colorado USA