High and dry: water vapor dynamics in the Chilean Andes and Sierra Nevada, California
Dr. Joseph Galewsky
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque
05 November 2013, 4:00 PM
National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Refreshments at 3:30 PM
Advances in instrumentation and supercomputing provide new opportunities to advance our understanding of large-scale water vapor dynamics and their links with the solid Earth. In this talk, an overview will be presented of two ongoing research projects, one focusing on subtropical water vapor dynamics in the subtropics and another on the impact of high topography on air parcel trajectories and precipitation processes in Sierra Nevada, California.
Cavity ringdown spectroscopy of water vapor isotopic composition from the subtropics (Hawaii’s Mauna Loa and Chile’s Chajnantor Plateau) provide new constraints on the relative roles of large-scale mixing and convection in controlling subtropical humidity and on ice supersaturation processes in the upper troposphere. Long-term monitoring of water vapor isotopic composition at these sites may help to constrain the processes associated with the projected moistening of the subtropics under global warming.
The geological evolution of the Sierra Nevada remains subject to debate due to the lack of consensus on the paleo-elevation history of the range. Abundant geological evidence indicates that the range underwent a pulse of uplift about 5 million years ago, but studies of the isotopic composition of paleo-precipitation proxies dispute these interpretations. New analysis of air parcel trajectories and precipitation over high terrain takes advantage of modern, idealized atmospheric modeling techniques and suggests that leeside proxies likely would not record the proposed late-stage uplift of the Sierras in any case and that other interpretations of paleo-precipitation proxies must account for terrain blocking effects.
For accommodations based on disability, or more details, please contact the School of Meteorology at 325-6561. All visitors without NOAA or University of Oklahoma identification must register at the registration desk on arrival. Visitor parking is available for all University visitors. However, faculty/staff/students must have a current multi-purpose parking permit. Additional parking is available at the Lloyd Noble Center (LNC) for those individuals who do not have a parking permit. You do not need a permit to park in one of 1,200 spaces reserved for CART bus riders, although you must ride the CART shuttle to park in the reserved area. This area is on the north central side of the Lloyd Noble Center. Elsewhere at the LNC, permits are required. The University of Oklahoma is a smoke-free / tobacco-free campus.