Impact of interactive A/O feedback on Multi-decadal Variability of East Asian and West African Summer Monsoon in the CFSv2 Simulation
Abstract
It is well known that monsoonal features have long-term variability but it is still challenging to reproduce their accurate variance at different scales in the recent climate modeling. Here we focused on East Asian Summer Monsoon (EASM) and West Africa monsoon (WAM) using the National Center for Environmental Prediction (NCEP)'s Climate Forecast System version 2 (CFSv2) but with implementing Simplified Simple Biosphere model version 2 (SSIB2) as its land surface model to examine how a model captures its long-term variance and to identify dominant factors for the inter-decadal variability, especially how interactive atmosphere-ocean coupling affecting the climate variability. We have created multi decadal simulation (60 years from 1949 to 2008). To diagnose importance of air-sea interaction two different simulations were conducted: one employed fully coupled CFSv2 model system which allows interactions between atmosphere and ocean components, while the other employed only atmospheric modeling component of CFSv2 with prescribed sea-surface temperature (SST) forcing. Analysis has endeavored through observed and simulated EASM's climatology, time correlation, variance range, monsoon index, and Empirical Orthogonal Function (EOF) patterns and decadal variability is one of our major focuses. The preliminary results indicate that freely conducted atmosphere-ocean interaction is crucial to reproduce inter-decadal variability of EASM and WAM, rather than feeding prescribed so accurate time-varying SST without interaction. Further detailed analysis will be discussed in the presentation.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.A23G0298L
- Keywords:
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- 3305 Climate change and variability;
- ATMOSPHERIC PROCESSESDE: 0402 Agricultural systems;
- BIOGEOSCIENCESDE: 1622 Earth system modeling;
- GLOBAL CHANGEDE: 4215 Climate and interannual variability;
- OCEANOGRAPHY: GENERAL