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​Multi-Scale Climate Processes and Rainfall Variability in the Maritime Continent

Published on: 06-Sep-2019

Event Type: Seminar
Event Date: 6 September 2019 - 4:00pm to 5:00pm
Venue: ASE 3D Viz Laboratory Room (N2-B1c-16c)
Speaker: Dr. Jian-Hua Qian (Joshua)

About the speaker:

Jian-Hua (Joshua) Qian got his Ph.D. in atmospheric science from the North Carolina State University in USA in 1996. Then he did his postdoc in the Climate and Global Dynamics Division of the National Center for Atmospheric Research (NCAR) in Boulder Colorado. Then he briefly worked at the NASA Goddard Space Flight Center on mesoscale atmospheric modelling. After that he was a research scientist (promoted to the tenured level in 2007) at the International Research Institute for Climate and Society (IRI) of Columbia University, and an associate professor in atmospheric and climate sciences at the University of Massachusetts Lowell. Since 2018, he joined the Centre for Climate Research Singapore (CCRS) as a Principal Research Scientist and the Head of the Climate Modelling and Prediction Section. He has broad research and teaching experiences in global and regional climate models, multi-scale climate processes, and the linkage between day-to-day weather regimes and long-term climate variability and change.


About the event:

Observed and climate modelling data are used to analyse multi-scale climate processes of the inter-annual El Nino-Southern Oscillation (ENSO), the annual cycle of the Asian-Australian monsoon, the eastward propagating intra-seasonal Madden-Julian Oscillation (MJO), the day-to-day synoptic weather regimes and the diurnal cycle of land-sea breezes in the Maritime Continent. These weather and climate processes will be briefly described and explained in the talk. Two new mechanisms were proposed to interpret the rainfall variability associated with ENSO in the Maritime Continent: 1) the monsoonal damping effect in which strong ambient winds disrupt the thermally driven diurnal cycle over narrow islands such as Java (Qian et al. 2010), and 2) the wake effect in which both the enhanced sea-breeze convergence and the downwind rainfall propagation act to increase the rainfall on the wake- or lee-side of wide islands such as Borneo (Qian et al. 2013). I will show you that these two mechanisms can also be used to interpret the early signals of rainfall anomalies in the Maritime Continent (the so called vanguard pattern) associated with the MJO. Lastly, I‘d also like to share with you some preliminary results of analysing  the  decadal variability and change in the rain gauge data at the MacRitchie reservoir in Singapore (1879-present) in the global context.

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