transport and scavenging of radionuclides in deep convection · 2011. 11. 22. · transport and...
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Transport and scavenging of radionuclidesin deep convection
Romain Pilon1,2 , Jean-Yves Grandpeix1
1Laboratoire de Météorologie Dynamique, CEA2
October 25th, 2011
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● What processes explain the evolution of the concentration?
● How does convection influence the particle distribution in the atmosphere?
● Provide diagnostics for atmospheric processes parameterized assessment
Goal
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Transport of tracer
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Transport of tracer
● Radionuclide 7Be →neutral tracer● Halflife 53days ● Source mainly in upper tropo lower strato
Deep convection Deposition terms
Wet scavenging, dry scavenging, radioactive decay
Emanuel massflux scheme
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Parameterization of convective scavenging
Convective saturated updraft
Surface
Introduction of tracerinto the cloud
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Surface
Entrainment Mixing
Convective saturated updraft
Parameterization of convective scavenging
Introduction of tracerinto the cloud
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Surface
Entrainment Mixing
Convective saturated updraft
Parameterization of convective scavenging
Introduction of tracerinto the cloud
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Surface
Detrainment
Precipitationof
condensate
Convective saturated updraft
Parameterization of convective scavenging
Entrainment Mixing
Introduction of tracerinto the cloud
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Surface
Unsaturated downdraft
Parameterization of convective scavenging
unsaturated
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Unsaturated downdraft
Resolving these budget equations
Parameterization of convective scavenging
Impaction term
unsaturated
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Experimental simulation: TOGA with 7Be
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Experimental simulation: TOGA with 7Be
Evaporation
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Experimental simulation: TOGA with 7Be
● Precipitation● Entrainment into the cloud
● Entrainment into the unsaturated downdraft
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Experimental simulation: TOGA with 7Be
Integral of concentration in the atmosphereBlack: no convective scavenging, red, with convective scavenging
Difference between the 2 curves precipitation
DEC JAN FEV
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TOGA with 7Be and datas
● Convective scavenging increases levels of concentration at the surface
● Magnitude closer to the datas
Surface concentrationsBlack: CTBTO datas, blue: without convective scavenging, purple: with convective scavenging
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Summary and outlook
● Processbased convective scavenging
● Tool for validation of convective scheme parameterization
● Help to understand processes in convection
● Comparison with CRM
● Modeldata comparison methodology (GCM)
● Paleoclimatology (10 Be)
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Wet scavenging
with
particle size aerosol numberconcentration
drop size collisionefficiency
terminal velocityof rain drop