CCI option "POLDER over land upgrade algorithm (GRASP)": regional maps of aerosol/surface parameter...
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P. Litvinov , O. Dubovik , T. Lapyonok , F. Ducos , D. Tanre PowerPoint PPT Presentation


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CCI option "POLDER over land upgrade algorithm (GRASP)": regional maps of aerosol/surface parameters and comparison with AERONET. P. Litvinov , O. Dubovik , T. Lapyonok , F. Ducos , D. Tanre. New POLDER/PARASOL algorithm (GRASP) ( Dubovik et al, AMT, 2011 ).

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P. Litvinov , O. Dubovik , T. Lapyonok , F. Ducos , D. Tanre

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P litvinov o dubovik t lapyonok f ducos d tanre

CCI option "POLDER over land upgrade algorithm (GRASP)": regional maps of aerosol/surface parameters and comparison with AERONET

P. Litvinov, O. Dubovik, T. Lapyonok, F. Ducos, D. Tanre


New polder parasol algorithm grasp dubovik et al amt 2011

New POLDER/PARASOL algorithm(GRASP)(Dubovik et al, AMT, 2011)

  • The new algorithm uses complete set of PARASOL angular measurements in all spectral bands including both radiance and linear polarization measurements.

  • Continuous space of aerosol and surface properties is used.

  • The algorithm is based on statistically optimized fitting.

    The core of the new PARASOL algorithm is based on the same concept as AERONET aerosol retrieval (O. Dubovik and M. King, 2000; O. Dubovik, 2004; O. Dubovik et al, 2006).

Frascati March 12, 2013


Aerosol model

Aerosol model

Aerosol model is the same as in AERONET retrieval (Mixing of particle shapes (Dubovik et al., 2006))

retrieved

C 

+ (1-C) 

Aspect ratio distr.

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Surface reflection model

Surface reflection model

  • Semi-empirical BRDF models (for surface total reflectance description):

    • RPV model (Rahman et al., (1993))

    • Ross-Li (Ross, (1981); Li, X., Strahler (1992))

    • Ross-Roujean model (Roujeanet al., (1992))

  • Semi-empirical BPDF models (for surface polarized reflectance description):

    • Nadal-Breon model (Nadal and Bréon, (1999))

    • Maignan model (Maignan et al., (2009))

  • Physically based models for the reflection matrix for surfaces:

    • Cox-Munk model, Koepke model for whitecaps (for aerosol retrieval over ocean)

    • Physical models for land surface reflection matrix (Litvinov et al., 2011)

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The concept of the algorithm

The concept of the algorithm

Two scenarios of retrieval (Dubovik et al., AMT, 2011):

  • Conventional: single-pixel retrieval (each single pixel is inverted independently)

  • New concept: multiple-pixel retrieval (group of pixels are inverted simultaneously)

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Regional maps 1800 x 1800 km banizoumbou aod 670 nm

Regional maps (1800 x 1800 km).Banizoumbou, AOD 670 nm

Strong spatial and temporal variation of AOD

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Regional maps 1800 x 1800 km banizoumbou ssa 670 nm

Regional maps (1800 x 1800 km).Banizoumbou, SSA 670 nm

Essential temporal variation of SSA

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Daily variation of aod and ssa at 670 nm banizoumbou jan febr 2008

Daily variation of AODand SSA at 670 nm. Banizoumbou (Jan., Febr. 2008).

21.02.2008

23.02.2008

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Regional maps 1800 x 1800 km banizoumbou salb 670 nm

Regional maps (1800 x 1800 km).Banizoumbou, SALB 670 nm

Surface is very stable for Jan. and Febr.!

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Regional maps 1800 x 1800 km beijing aod 670 nm

Regional maps (1800 x 1800 km).Beijing, AOD 670 nm

Strong spatial and temporal variation of AOD

Frascati March 12, 2013


Regional maps 1800 x 1800 km beijing ssa 670 nm

Regional maps (1800 x 1800 km).Beijing, SSA 670 nm

Strong spatial and temporal variation of SSA

Frascati March 12, 2013


Daily variation of aod and ssa at 670 nm beijing december 2008

Daily variation of AODand SSA at 670 nm. Beijing (December, 2008).

01.12.2008

Small

Values of

AOD !!!

08.12.2008

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Regional maps 1800 x 1800 km beijing salb 670 nm

Regional maps (1800 x 1800 km).Beijing, SALB 670 nm

Surface is stable for December!

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Regional maps 1800 x 1800 km europe aod and ssa 670 nm

Regional maps (1800 x 1800 km).Europe, AOD and SSA 670 nm

Strong spatial variation of AOD and SSA

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Regional maps 1800 x 1800 km europe salb 670 nm and 865

Regional maps (1800 x 1800 km).Europe, SALB 670 nm and 865

Big contrast between 670 and 865 because of vegetation!!!

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Comparison with aeronet

Comparison with AERONET

Beiging

Kanpur

Banizoumbou

Mongu

Banizoumbou: January, February, 2008

Surface: Grassland. Aerosol: Coarse mode is dominated.

Mongu:August, September, 2008

Surface: Savanna. Aerosol: Fine mode is dominated.

Beijing:April, December, 2008

Surface: Urban. Aerosol: Fine and Coarse modes.

Kanpur:October-December, 2008

Surface: Urban. Aerosol: Fine and Coarse modes.

The IGBP (International Geosphere Biosphere Programme) land type specification was used

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Aod polder aeronet

AOD. POLDER/AERONET

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Angstrom exponent polder aeronet

Angstrom Exponent.POLDER/AERONET

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Ssa polder aeronet

SSA. POLDER/AERONET

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Main issues to be solved

Main issues to be solved

  • Acceleration of the inversion (Parallel GPU computation. First version of the parallelized code should be ready by the end of 2013).

  • Framework for PARASOL data preparation for the inversion with new algorithm (should be done by the end of 2013).

Frascati March 12, 2013


Next steps of loa contribution into cci project

Next steps of LOA contribution into CCI project

  • Reprocessing 1 year (2008?) of PARASOL data with new algorithm (land + ocean) and validation/comparison with AERONET/MODIS.

  • Provide PARASOL Climatology (complex refractive index, size distribution, fraction of spherical particles, surface BRDF/BPDF parameters).

Frascati March 12, 2013


300 by 300 pixels area projections

300 by 300 pixels area projections

Frascati March 12, 2013


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