Studying the Aerosol-Radiation-Interaction with LM-ART
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Studying the Aerosol-Radiation-Interaction
with LM-ART
Dominique Bäumer
Max Bangert
Kristina Lundgren
Rayk Rinke
Tanja Stanelle
Bernhard Vogel
Heike Vogel
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COSMO LM – ART (ART = Aerosols and Reactive Trace Gases)
Concept:
LM-ART is online coupled.
Identical methods are applied for all scalars as temperature, humidity, and concentrations of gases and aerosols to calculate the transport processes.
It has a modular structure.
Therefore LM-ART can easily be used in the forecast mode.
www-imk.fzk.de/tro/ACP/
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Parameterization of the horizontal saltation and the vertical emission flux (Vogel et al, 2006)
3 different Modes (d = 1.5, 6.7, 14.2 µm)
Log normal distributions
Parameterization of the Dust Emissions
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Photochemistry
H SO2 4
HNO3
NO2
sun O3
O
O2 O( D)1
H O2
OH
SO2
RCH3
CO
RCHO
NO2
RCO NO3 2
(e.g. PAN)
H O2
CO2
H RCH2RCH O2
O2
HO2
RCH2O2
O2
Staehelin und Dommen (1994)
NO
H2 2O O2
NH3
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Interaction of five modes:
• Two modes for SO42-, NO3
-, NH4+,
H2O, SOA, internally mixed.
• One mode for pure soot.
• Two modes for SO42-, NO3
-, NH4+,
H2O, SOA, and soot internally mixed.
condensation of SO4
2-, NH4+, NO3-, SOA
coagulation
Source: homogeneous nucleation of H2SO4/water
Three modes for mineral dust particles + three modes for sea salt particles + pollen
Treatment of the Aerosol Particles
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New Routine in LM-ART:
Computation of , b, g for prevailing aerosol concentration
New Routine in LM-ART:
Computation of , b, g for prevailing aerosol concentration
Modified radiation in LM:
Substitution of climatological optical properties based on current aerosol concentrations
Modified radiation in LM:
Substitution of climatological optical properties based on current aerosol concentrations
Transport, Sedimentation, Deposition
LM-ART
, b, g
Refractive inde of aerosols
Mie Calculations
Single scattering albedo (), specific extinction coefficient (b), asymmetry parameter (g)
Optical Properties of the Aerosols
Size distribution, chemical composition of each mode
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Case Study: Mineral dust over West Africa in March 2004
Meteosat-8 Image, 2. – 3. März 2004
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Results: Fully coupledResults: Fully coupled
March 2, 2004, 12 UTC
March 4, 2004, 12 UTC
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Effects on Radiation (4.3.2004, 12 UTC)
Long wave net radiation at the surface
Short wave net radiation at the surface
Sim. A2
Sim. C
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Change in cloud cover (4.3.2004, 12 UTC)
%
A2 C
A2 - C
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Foreseen simulations for 2005 within WP 2.4
March 2006: 4.3. – 9.3.2006
Data:
- ECMWF analysis (existing)- soil properties in high resolution (B. Marticorena)
Comparison:
- with meteorological stations- with measurements from Slingo et al. (2006)- optical thickness measured by MFRSR in Niamey- upward and downward fluxes (ARM Mobile Facility [RADAGAST – Project]) in Niamey- radiation fluxes in TOA (perhaps) measured by GERB and by CERES broadband instruments on TERRA and AQUA satellites - with AERONET stations- with Lidar measurements (Flament)
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Foreseen simulations for 2005 within WP 2.4
January 2006: 15.1. -30.1.2006
Input Data: - ECMWF analysis - soil properties in high resolution (B. Marticorena)- emissions of biomass burning particles (1.1. – 30.1.) (?)- emissions for calculating ozone (26.1. – 30.1.) (?)
Comparison:
- with meteorological stations - with AERONET stations - Flights B159 (19.1) and B160 (21.1., dust and biomass burning) - Lidar Banizoumbou (18.1., dust and bb, Formenti) - Lidar Banizoumbou (15.1., Heese) - dust radiative forcing (17.1., Mallet)