[1] NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA
[2] PENN STATE UNIV, DEPT METEOROL, UNIVERSITY PK, PA 16802 USA
[3] HARVARD UNIV, DEPT CHEM, CAMBRIDGE, MA 02138 USA
[4] HARVARD UNIV, DEPT EARTH & PLANETARY SCI, CAMBRIDGE, MA 02138 USA
[5] COMPUTAT PHYS INC, ANNANDALE, VA USA
[6] UNIV COLORADO, NOAA, COOPERAT INST RES ENVIRONM SCI, BOULDER, CO 80309 USA