[A-CG37_28AM2] 熱帯におけるマルチスケール大気海洋相互作用現象

[ACG37-03] Observed moisture variations associated with shallow convection

*BELLENGER Hugo¹、KATSUMATA Masaki¹、YONEYAMA Kunio¹、NISHIZAWA Tomoaki²、YASUNAGA Kazuaki³、SHIROOKA Ryuichi¹ (1.JAMSTEC、2.NIES、3.University of Toyama)

キーワード：Convection, moisture, MJO, CINDY/DYNAMO, preconditionning, observation

The variability of tropospheric moisture is a key feature of tropical climate. In particular, the importanceof moisture variations due to convective transport is still to be quantified on a variety of spatial andtemporal scales. For instance, there is a debate on the importance of moisture convective transport inpreconditioning the atmosphere prior to deep convection development associated with the Madden--Julian Oscillation (MJO). We use here high frequency observations of humidity and convection in theIndian Ocean by lidars and radars on board the R/V Mirai during the CINDY/DYNAMO campaign.Significant moisture variations on the scale of few hours are observed within the first first kilometers ofthe atmosphere in association with shallow convective and congestus clouds. We then compare theselocal tendencies with large--scale ones and discuss the potential importance of convective transport byconvection in the moisture budget during the transition from convectively suppressed to convectivelyactive periods.