Cloud Field and in Cloud Air Motion Variations Associated with Madden Julian Oscillation (MJO) Observed by ARM Cloud Radars during the AMIE/DYNAMO/CINDY Project

The MJO is an intraseasonal fluctuation in the global tropics with a cycle of 30-60 days (Madden and Julian 1971, 1972). It is characterized by eastward propagation of regions of enhanced and suppressed tropical rainfall, associated with distinct patterns of lower and upper atmospheric circulation anomalies in the tropics. The AMIE-Gan campaign is associated with the CINDY/DYNAMO project to fully characterize the ensemble of convection associated with MJO initiation in the Indian Ocean with ARM instruments. The new ARM Ka zenith pointing radar and scanning X- and Ka -band radar provide high temporally and vertically resolved data, which is preferable for light precipitation and high anvil cloud observation. In this study, we study the daily variations of cloud and precipitation associated with MJO phases. Besides the morphology of cloud systems such as structure and organization of cloud ensembles, the microphysical properties of anvil cloud and their internal air motion retrieved from Doppler moments are also investigated.