My research focuses on the fluid dynamics of Earth’s tropical atmosphere. One emphasis is monsoon circulations, which deliver water to billions of people in socially vulnerable, agricultural economies. Despite the importance of monsoon rainfall, there is no established theory that explains the observed variability of monsoons, and climate models make disparate predictions for next-century changes in monsoon rainfall. In my work, I pay particular attention to the treatment of phase changes of water that result in precipitation, as the interaction between precipitation and planetary-scale flow is one of the central unresolved problems of tropical meteorology. To this end, I combine theory, observational analyses, and numerical models, frequently using computationally intensive, high resolution simulations to explicitly represent precipitating atmospheric convection.
Ph.D. in Atmospheric Science, 2008
M.Sc. in Geosystems, 2002
B.S. in Physics, B.A. in Math, 1997
I’m thinking about my carbon footprint and trying to minimize travel, though I do undertake trips that are important for my mission of trying to improve the understanding and prediction of precipitation in tropical, developing countries. I post my travel plans here in hopes that future trips might be combined to minimize air travel. One cross-country, round-trip U.S. flight emits about 1000 kg of CO2, while one long-haul international round trip emits about 2000 kg of CO2. In comparison, all of the electricity, natural gas, and municipal water used by my 2-person household are estimated to generate about 4500 kg of CO2 per year.
Peking University, 90th anniversary of the Department of Atmospheric and Oceanic Sciences, May 25-29, 2019
Current courses at UC Berkeley:
WorldMonsoons.org, a website with educational pages and recent news about monsoons
Somali jet index, a measure of the strength of the South Asian monsoon circulation, and of roughly 30 percent of the global cross-equatorial flow
South Asian vertical shear index, the strength of the vertical shear of the zonal wind over South Asian. This was developed by Webster and Yang (1992, QJRMS) as a measure of the strength of the South Asian monsoon circulation.
I am pleased to announce a new, multi-institutional partnership to improve understanding and prediction of monsoon rainfall. As part of this new effort, my group is actively seeking two postdoctoral scientists and a software developer/programmer. We additionally expect to admit one or two new Ph.D. students to start in Fall 2019.