1. Department of Atmospheric Sciences; University of Washington; Seattle Washington USA
2. Earth Sciences Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Interdisciplinary Arts and Sciences; University of Washington-Bothell; Bothell Washington USA
4. Goddard Earth Sciences and Technology Center; University of Maryland Baltimore County; Baltimore Maryland USA
5. Air Quality Research Division, Science and Technology Branch; Environment Canada; Toronto, Ontario Canada