Criando nuvens de gelo em laborat

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Criando nuvens de gelo em laboratório
Prof. Manfredo H Tabacniks IFUSP/UMBC/NASA
30 de outubro de 2008
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Climate Change 2007 Syntesis Report. IPCC
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Climate Change 2007 Syntesis Report. IPCC
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Atmospheric scatterers
Rain drops
Ice crystals (hail, etc. greater)
Cloud drops (typically 5-10 µm)
Coarse aerosol (sand, dust sea salt)
lt
Most aerosol (gt0.01 µm)
size
wavelength

gt
Air molecules 0.0004 µm
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Aerosol Impact on Clouds Microphysics and
Thermodynamics
J. Vanderlei Martins, A. Marshak, L. A. Remer, D.
Rosenfeld, Y. J. Kaufman, R. Fernandez-Borda, I.
Koren, V. Zubko, P. Artaxo ACPD 7, 4481-4519,
2007
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Smoke!!!
Cloud Base
2.1mm
0.55mm
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Light Scattering Process
Martins, V. personal comm.
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Measuring Clouds
J. Vanderlei Martins, Alexander Marshak, Tobias
Zinner, Lorraine Remer, ACP 2006, 2007, 2008.
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(No Transcript)
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água -30ºC ? água 0ºC água 0ºC ? gelo gelo 0ºC ?
gelo -30ºC
Kostinski Cantrell, JAS 65 (2008) 2961-71
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aerosol generator and reactor
vacuum pump
light
100mm
analyzer
dewar
INEF
ringing absorpmeter
m
mixer 2
thermal insulation
T
P
reactor drier humidifier cooler
humid air (N2)
cold (freezing) air
drift tube or/and diffusion dryer
30 cm
Di 10mm
aerosol generator
mixer 1
f1
Di 20mm
1 L/min
20 cm
dry N2
f2
MFM
(soil dust) suitable solvent
N2
1-10 L/min