1. Department of Applied Physics and Applied Mathematics; Columbia University; New York New York USA
2. Department of Applied Mathematics, School of Mathematics and Statistics; University of New South Wales; Sydney New South Wales Australia
3. Department of Earth and Environmental Sciences; Columbia University; New York New York USA
4. Department of Earth and Planetary Sciences; Johns Hopkins University; Baltimore Maryland USA
5. Goddard Earth Sciences Technology and Research; Universities Space Research Association; Columbia Maryland USA
6. Laboratory for Atmospheric Chemistry and Dynamics; NASA Goddard Space Flight Center; Greenbelt Maryland USA