A New Intraseasonal Oscillation Index Based on Cloud-Sat Observed Cloud Regimes

Authors: Meng-Pai Hung*, Chinese Culture University, Wei-Ting Anne Chen, National Taiwan University, Chien-Ming Wu, National Taiwan University, Pei-Ning Feng, National Taiwan University
Topics: Climatology and Meteorology
Keywords: MJO, Cloud Regimes, ClousSat, Intraseasonal variability
Session Type: Poster
Day: 4/4/2019
Start / End Time: 8:00 AM / 9:40 AM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded

This study applies cloud regimes (CR) retrieved from the CloudSat observation to evaluate the tropical cloud populations associated with the Madden-Julian Oscillation (MJO) and their interaction with the large-scale environment from 2006 to 2017. Based on the characteristics of the CloudSat, the proposed index is established to identify the modulation of deep, high and low clouds and their evolution within MJO propagation over the tropical Indian Ocean, the Maritime Continent, and the Western Pacific. The results highlight the significance of CR index in cloud statistics given large-scale moisture distribution which provides guidelines for evaluating the bias in climate models in simulating the MJO associated with cloud processes.

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