Aerosol, Cumulus Congestus, MJO Xiaowen Li GEST/UMBC Wei- Kuo Tao NASA/GSFC
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Transcript of Aerosol, Cumulus Congestus, MJO Xiaowen Li GEST/UMBC Wei- Kuo Tao NASA/GSFC
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Aerosol, Cumulus Congestus, MJO
Xiaowen LiGEST/UMBC
Wei-Kuo TaoNASA/GSFC
Aerocenter Annual Meeting April 2010
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Cumulus Congestus ~103 m
Making a connection….
Madden-Julian Oscillation ~107 m
aerosols~10-7 m
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TOGA COARE control Experiment with typical Maritime Aerosol concentrations (Jaenicke, 1988)
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TOGA COARE 10x control aerosol number concentrations
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Summary of TOGA COARE Simulation
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COARE
PRESTORMCEPEX
CEPEX
CEPEX
CEPEX
0
100
200
300
400
500
600
700
800
NM ConvCRYSTALFL Conv
TX ConvTX Conv
Med WinTX Conv
CRYSTALMed Win
TX ConvMed Win
Med Win
GATE
PRESTORM
NM Conv (4200)
-100-90-80-70-60-50-40-30-20-10
0
0 500 1000 1500 2000 2500 3000
Other Cloud Modeling Studies
∆P
(%)
∆N (cm-3)
GATELBA
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Why?
• TOGA COARE Thermodynamics;• Characteristics of Maritime aerosols;• Cloud microphysics and dynamics interactions;• Implications on large scale circulations.
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Average temperature profile from COARE IFA
Thermodynamics
Johnson (1999)
Tropical oceanic sounding is characterized by ample water vapor supply, weak instability, and two inversion layers: trade wind inversion and 0°C inversion.
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Higher concentrations at the large size tail but much lower concentration at smaller size
continenal
maritime
Maritime Aerosols
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High CCN
Low CCN
When there is large moisture supply, low CCN and less cloud drops resulted in less latent heat release.As a result, most clouds cannot pass the 0°C inversion level.
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TOGA COARE IFA heating profiles during MJO events. The tilting at the MJO onset indicates cumulus congestus heating, which is poorly simulated in GCMs.
(Lin et al. 2004)
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aerosol conccharacteristicsof convection
atmos heating
Tropical wave speed
intraseasonalvariations andgeneral circulation
A Simplified Theory
Aerosol cycle over clean tropical ocean needs to be considered in order to properly simulate convection intensity and MJO events.
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Multi-Scale Modeling System with Unified Physics
MMF: Multi-Scale Modeling FrameworkLIS: Land Information SystemGCE: Goddard Cumulus Ensemble Model
WRF: Weather Research Forecast Goddard Microphysical Package (5 options)& Goddard Long/Shortwave Radiative Transfer(including cloud-radiation interaction)
Satellite DataField CampaignsRe-analyses (MERRA)
TRMM Jan/99
MMF
GOCART
GCE - LBA (250 m, 30 sec)
WRF- Hurricane Katrina
(1.67 km, 2 min)
Tao, W.-K., D. Anderson, J. Chern, J. Estin, A. Hou, P. Houser, R. Kakar, S. Lang, W. Lau, C. Peters-Lidard, X. Li, T. Matsui, M. Rienecker, M. R. Schoeberl B.-W. Shen, J.-J. Shi, and X. Zeng, 2009: Goddard Multi-Scale Modeling Systems with Unified Physics, Annales Geophysics, 27, 3055-3064.
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Thank You!