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Improved Intraseasonal Variability in the NASA GEOS AGCM with 2-moment Microphysics and a Shallow Cumulus Parameterization
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Author and Affiliation:
Arnold, Nathan(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Barahona, Donifan(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Achuthavarier, Deepthi(Universities Space Research Association, Greenbelt, MD, United States)
Abstract: Weather and climate models have long struggled to realistically simulate the Madden-Julian Oscillation (MJO). Here we present a significant improvement in MJO simulation in NASA's GEOS atmospheric model with the implementation of 2-moment microphysics and the UW shallow cumulus parameterization. Comparing ten-year runs (2007-2016) with the old (1mom) and updated (2mom+shlw) model physics, the updated model has increased intra-seasonal variance with increased coherence. Surface fluxes and OLR are found to vary more realistically with precipitation, and a moisture budget suggests that changes in rain reevaporation and the cloud longwave feedback help support heavy precipitation. Preliminary results also show improved MJO hindcast skill.
Publication Date: Dec 11, 2017
Document ID:
20170011698
(Acquired Dec 14, 2017)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: GSFC-E-DAA-TN50425
Document Type: Oral/Visual Presentation
Meeting Information: American Geophysical Union (AGU) 2017 Fall Meeting; 11-15 Dec. 2017; New Orleans, LA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Contract/Grant/Task Num: NNG11HP16A
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Public use permitted
NASA Terms: ATMOSPHERIC MODELS; CLIMATE MODELS; FEEDBACK; RAIN; HINDCASTING; MOISTURE; PRECIPITATION (METEOROLOGY); MADDEN-JULIAN OSCILLATION; SIMULATION; VARIABILITY; PARAMETERIZATION
Other Descriptors: MADDEN-JULIAN OSCILLATIO
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