On the definition of a benchmark test for global dust models
14 Pages
English
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On the definition of a benchmark test for global dust models

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14 Pages
English

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On the definition of a benchmark test for global dust modelsN. Huneeus (1), M. Schulz (1), Y. Balkanski (1), J. Griesfeller (1), and S. Kinne (2) Laboratoire des Sciences du Climat et de l’Environnement, L’Orme de Merisier, Gif surYvette, FranceMax-Planck-Institut für Meteorologie, Hamburg, Germanyth7 AeroCom Workshop, 8-10 October 2008, ReykjavikSetup• Goal: Define a benchmark to evaluate model performance and/or improvement of the dust cycle• Aerocom A Models + ECMWF GEMS• Year 2000 (Aerocom) & 2003 (ECMWF• Surface concentration, Total dust deposition, Optical depth & Angström exponent• Monthly Averages (Surface concentration, Optical Depth & Angström esponent)• Yearly Average (Dust deposition)• Measurment years: 2000 & 2003 (AERONET) and climatological (all)Measurement NetworksSurface Concentration (AEROCE, Univ. Of Miami)Optical Depth 550 nm (AERONET)Angström Exponent (AERONET)Dust Deposition (Ginoux et al, 2001)Dust Deposition (F. Dulac)Dusty sites: AERONET Sites with a predominance of dust in the total optical depth during most of the year (at least 4 month)African sites (red) & Middle east (blue)Statistical ParametersRelative Error+Gradehttp://nansen.ipsl.jusssieu.fr/AEROCOMModel-Observation comparisonSurface concentration Optical Depth(Climatology)Model-Observation comparisonDust Deposition (Ginoux) Dust Deposition (Dulac)Dusty Sites analysis: Optical DepthAll Aeronet sites All Dusty ...

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On the definition of a benchmark test for global dust models
N. Huneeus (1), M. Schulz (1), Y. Balkanski (1), J. Griesfeller (1), and S. Kinne (2) Laboratoire des Sciences du Climat et de l’Environnement, L’Orme de Merisier, Gif sur Yvette, France Max-Planck-Institut für Meteorologie, Hamburg, Germany
7 th AeroCom Workshop, 8-10 October 2008, Reykjavik
Setup
Goal: Define a benchmark to evaluate model performance and/or improvement of the dust cycle
Aerocom A Models + ECMWF GEMS
Year 2000 (Aerocom) & 2003 (ECMWF
Surface concentration, Total dust deposition, Optical depth & Angström exponent
Monthly Averages (Surface concentration, Optical Depth & Angström esponent)
Yearly Average (Dust deposition)
Measurment years: 2000 & 2003 (AERONET) and climatological (all)
Measurement Networks
Surface Concentration (AEROCE, Univ. Of Miami)
Optical Depth 550 nm (AERONET)
Angström Exponent (AERONET)
Dust Deposition (Ginoux et al, 2001)
Dust Deposition (F. Dulac)
Dusty sites: AERONET Sites with a predominance of dust in the total optical depth during most of the year (at least 4 month)
African sites (red) & Middle east (blue)
+
Statistical
Relative Error
Grade
Parameters
http://nansen.ipsl.jusssieu.fr/AEROCOM
Model-Observation comparison
Surface concentration
Optical Depth (Climatology)
Model-Observation comparison
Dust
Deposition
(Ginoux)
Dust
Deposition
(Dulac)
Dusty Sites analysis: Optical Depth
All Aeronet sites
African
sites
All Dusty sites
Middle East sites
2003
Surface Concentration Deposition Ginoux Deposition Dulac OD All Sites OD Dusty Sites OD African Sites OD Middle East Sites ANG All Sites ANG Dusty Sites ANG African Sites ANG Middle East Sites
Relative Error Score
Climatology
RMS i RMS ref S i = RMS ref
RMS
2000
: RMS of model i
i RMS ref : Median RMS of the 15 Model RMS errors
Approach from Gleckler et al. (2008)
Surface Concentration Deposition Ginoux Deposition Dulac OD All Sites OD Dusty Sites OD African Sites OD Middle East Sites ANG All Sites ANG Dusty Sites ANG African Sites ANG Middle East Sites
S = 4(1 + R ) ( 1 + R x ) σ+σ 1 2
Taylor (2001)
Taylor Score
R : Correlation R x : Maximal attainable correlation σ= σ M O σ Μ =Model Standard deviation σ O =Observation Standard deviation
Surface Concentration Deposition Ginoux Deposition Dulac OD All Sites OD Dusty Sites OD African Sites OD Middle East Sites ANG All Sites ANG Dusty Sites ANG African Sites ANG Middle East Sites
Grade Score
Approach from Waugh and Eyring (2008)
M O S i = 1 1 n g σ obs
M = Model mean
O = Observation
m
n g = scaling factor
aen
 Duson &posit dec noafecaritectnt  athepsiy stduO & noitd lacitpAveragerAve agomfrur saT erolyocs  :er1,9,11,00860,7,50,0,4020,300er,01,rolyocs agerTae Av
Surface Concentration Deposition Ginoux Deposition Dulac OD All Sites OD Dusty Sites OD African Sites OD Middle East Sites ANG All Sites ANG Dusty Sites ANG African Sites ANG Middle East Sites
Average Surf Conc Dep Ginoux Dep Dulac OD Dusty Sites ANG Dusty Sites
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