The Role of Dry Dynamics in the MJO

Friday, 22 April 2016: 12:15 PM
Miramar 1 & 2 (The Condado Hilton Plaza)
Stefan N. Tulich, CIRES/Univ. of Colorado and NOAA/ESRL, Boulder, CO

Most recent theoretical studies of the MJO have argued that moisture-convection feedbacks are essential to explaining the existence of this planetary-scale phenomenon (e.g., the "moisture-mode" hypothesis). However, it is well known from observations that signals of the disturbance in circulation are not always coupled to convection, even over the Indo-Pacific warm pool region. While some might argue that these "dry" MJOs should be regarded as the convectively forced remnants of previous "moist" MJOs, I will present evidence in this talk to suggest a crucial role of dry planetary wave dynamics.
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