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Sensitivity of Cloud and Precipitation to Aerosol, Surface and
Thermodynamics in Amazonas
Luiz A. T. Machado, Manfred Wendisch, Wagner Lima, Alan Calheiros, Rachel Albrecht, Meinrat Andreae, Paulo Artaxo, Thiago Biscaro, Micael A. Cecchini, Fan Mei, Scott Giangrande, Scot Martin, Uli Poeschl, Daniel Rosenfeld
and Courtney Schumacher.
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Outcome
• Rainfall and Cloud Characteristics for each IOP;
• Rainfall and Cloud as Function of Orography;
• Rainfall and Cloud Microphysics as Function of Vegetation type;
• Rainfall and Cloud Microphysics as Function of Aerosol.
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Rainfall and Clouds Characteristics for each IOP
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CAPE – Convective Available Potential Energy
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Rain Rate Distribution as Function of the IOPs
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CAPE vs Rainfall and Cloud Cover
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Droplet Size Distribution As Function of IOPs
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Median 75 km Diameter – 1,5 Hours Life Time – Cloud (Tir < 235 K)
Cloud and Rainfall Space-Time ScaleAmazonian Typical Convective Cloud
Median 7,5 km Diameter – 0,6 Hours Life Time – Rainfall (Ref>20 dBZ)
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CLOUD RAINFALL
Cloud and Rainfall Organization – Space ScaleIOP1 and IOP2
IOP2 –Proportionally has more small Systems
IOP2–Proportionally has more rain cell sizes 7-30 km
IOP1 –Proportionally has more large Systems
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CFAD – Contour Frequency by Altitude DiagramsIOP1 IOP2
Average Behavior - Typical Stratiform Average Behavior - Typical Convective
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Cloud and Rainfall OrganizationIOPs Difference (Wet and Dry Season)
IOP1 IOP2
Life Time of clouds and rain cells Tiop1 > Tiop2
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Rainfall as Function of Orography
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Rainfall as Function of Orography
20
15
10
5
Ra
in R
ate
(m
m/h
r)
14012010080604020
Topography Elevation (m)
IOP1 25% Percentiles
IOP1 75% Percentiles
IOP1 95% Percentiles
IOP2 25% Percentiles
IOP2 75% Percentiles
IOP2 95% Percentiles
S Band Radar Rain Rate as Function of Orography
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Rainfall, Cloud Microphysics and Thermodynamics as Function of
Vegetation type
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Rainfall and Surface Cover
Forest (73%)
Urban (~1%)
Deforested (8%)
Hydrology (18%)
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Rainfall and Surface Cover
Average area covered (%) by Rain Rate
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Rainfall and Surface Cover
Rain Rate - Intensity
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HALO – ACRIDICON CHUVA - AC17
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Halo Flight – Forest and Deforested 1500 UTC
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Cloud Liquid Water Distribution for Forest and Pasture
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Cloud Droplets Distribution for Forest and Pasture
2P* 2P*25 253 3
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Cloud Liquid Water and Concentration for Forest and Pasture
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Vertical Velocity and Cloud Droplets for Forest and Pasture2P*
2P*
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Rainfall - DSD - IOP1 Clean and Plume
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IOP1 - CFAD– Contour Frequency by Altitude DiagramsCLEAN PLUME
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IOP1 – Wet Season – Plume and Rainfall
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Conclusions
• Very different thermodynamic and rainfall characteristics behavior between IOPs
• Typical convective spatial scale for each IOP
• Rainfall orography selection mainly for IOP2
• Influence of vegetation type on rain rate (urban-deforested) and in the total rainfall (IOP2 over forest)
• Complex Influence of forest-pasture on thermodynamics and cloud microphysics
• Influence of Manaus Plume on cloud process (IOP1)