National Weather Center Colloquium

Dynamics of the Madden-Julain oscillation

Dr. Adam Sobel
Columbia University

06 May 2014, 3:30 PM

National Weather Center, Room 1313
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

Reception at 3:30 PM

The Madden-Julian oscillation (MJO) is the dominant mode of variability in the tropics on the intra-seasonal time scale and one of the most important coherent, quasi-periodic modes of natural variability in the global climate system altogether. Though it was discovered over 40 years ago, we still do not understand the MJO in the sense of being able to state a simple mathematical model that explains its basic features as consequences of clear physical mechanisms. Evidence will be presented that the MJO is what some of us now call a "moisture mode", best analyzed through the budget of moist static energy or moist entropy. It will be argued that cloud-radiative feedbacks are important to the maintenance of the MJO, while horizontal advection of moisture is important to its eastward propagation. Evidence to this effect will be presented from observations, theory, general-circulation, and cloud-resolving models.

Speaker bio

For accommodations based on disability, or more details, please call 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.

National Weather Center Colloquium Seminar Series website