On the definition of a benchmark test for global dust models

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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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• Natural science

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• Published by: Inse
• Reads: 12
• Language: English

Exrait

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

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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)

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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 /σ 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

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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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