Two Madden-Julian Oscillation (MJO) events during the 2011 DYNAMO (Dynamics of the MJO) experiment over the Indian Ocean were associated with global-circumnavigating Kelvin waves. Prominent temperature anomalies associated with the Kelvin waves extending into the TTL had an impact on the cloud and precipitation features in the MJO. Near-tropopause cool anomalies led to the development of cirrus well in advance of the arrival of the MJO convectively active phase, contributing to a reduction in the net tropospheric radiative cooling. Descending warm anomalies led to a gradual descent in the tops of deep convection through the MJO active phase.

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*email: johnson@atmos.colostate.edu
*Preference: Oral