Aerosol variability and properties from POLDER-3/PARASOL...

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Coarse non spherical AOD 865 nm Total AOD 865 nm 0,3 0,3 0,3 0,3 Number of observations 300 300 300 300 Fine AOD 865 nm 0,1 0,1 0,1 0,1 Aerosol variability and properties from POLDER-3/PARASOL satellite retrievals in the Mediterranean region Isabelle Chiapello 1 , Quentin Coopman 1 , Philippe Goloub 1 , Fabrice Ducos 1 , Didier Tanré 1 and François Dulac 2 1 Laboratoire d’Optique Atmosphérique, CNRS/Université Lille 1, Villeneuve d’Ascq, France ([email protected] ) 2 LSCE, CEA/CNRS/UVSQ Gif-sur-Yvette France POLDER-3 aerosol retrievals for 2 Mediterranean AERONET/PHOTONS sites Ersa (Corsica) and Lampedusa Conclusions Using POLDER for assessment of aerosol variability over the Mediterranean PARASOL is a microsatellite part of the A-TRAIN*. It is carrying POLDER-3 (Polarization and Directionality of the Earth’s Reflectances), a wide-field imaging radiometer/polarimeter providing near-daily observations of aerosol properties since March 2005. 1. In the Mediterranean region, the aerosol variability retrieved from POLDER-3 is generally consistent with that derived from AERONET/PHOTONS Sunphotometer measurements. 2. POLDER-3 shows maximum aerosol loads in Spring and Summer, a large influence of African dust especially in the southern part of the basin. 3. POLDER-3 Fine and Coarse AOD show decreasing trends over the Mediterranean from 2005 to 2012, especially in Summer (JJA). References. POLDER data: Herman et al., JGR 2005 – AERONET data: Holben et al., JGR 2001. Acknowledgments. We thank the AERONET/PHOTONS group and sites team and the ICARE Data and Services Center for providing access to the data used in this study. We focus on (i) Analysis of POLDER-3 aerosol retrievals for 2 AERONET/PHOTONS Sun/Sky photometer sites in the Mediterranean basin, used as « ground truth » references: ERSA and LAMPEDUSA (ii) Analysis of POLDER-3/PARASOL aerosol observations over the Mediterranean Sea Our final objective is to assess and understand aerosol spatial distribution, temporal variability and recent evolution in the Mediterranean region. This approach is part of the ChArMEx effort for a global analysis of the influences of precipitations, North Atlantic Oscillation, as well as contributions of different aerosol sources (natural versus anthropic), and impact of extreme events (fires, Saharan dust) on the Mediterranean aerosol loads, both in terms of variability and long-term trends. POLDER-3 aerosol distribution over the Mediterranean Sea * PARASOL orbit has been lowered twice in December 2009 and in November 2011 Seasonal variability (2005-2012) Winter (DJF) Spring (MAM) Summer (JJA) Autumn (SON) Aerosol loads are maximum in Spring (eastern part) and Summer (western part), minimum in Winter and Autumn. Coarse non spherical aerosol dominate the South part of the basin. Fine AOD show generally low to moderate levels (<0,10), slightly increasing in the central and eastern part of the Mediterranean (Summer). Number of values of observations strongly varies from one season to another: maximum in Summer and Spring, minimum in Winter and Autumn. POLDER has interesting capabilities to derive both aerosol loads (total aerosol optical depth) ans size properties (fine, coarse non spherical AOD) over oceanic surfaces. 4. Understanding POLDER-3 aerosol variability over the Mediterranean will require more investigations on the respective impact of meteorology (North Atlantic Oscillation, rainfall) and human activities on the observed evolution of aerosol loads. ChArMEx (the Chemistry-Aerosol Mediterranean Experiment; http://charmex.lsce.ipsl.fr/) program focuses on the Mediterranean basin, a marine region under the major influence of aerosol particles from different continental sources (dust from Africa, industrial and urban aerosols from Europe, biogenic secondary organics and biomass burning), in addition to sea-salt and marine biogenic aerosols. 7 th International Workshop on Sand/Duststorms and Associated DustFall, 2-4 December 2013, Frascati Italy AERONET DATA ERSA LAMPEDUSA Position 43°00’14’’ N 35°31’01’’ N 9°21’32’’ E 12°37’55’’ E Mean AOD 675 nm 0,10 (0,07) 0,15 (0,15) Mean Angström 1,28 (0,44) 0,94 (0,50) AOD – Total – 670 nm AOD – Fine – 670 nm POLDER-3 versus AERONET/PHOTONS AOD Total 670 nm Monthly averages JAN 2005 – DEC 2012 Ersa Lampedusa AERONET POLDER-3 AERONET POLDER-3 POLDER-3 Fine/Coarse AOD 670 nm Ersa Lampedusa Maximum total AOD 670 : June (May-July) April (June) Fine AOD 670 range: 25-52% 24-34% Ersa Lampedusa Total AOD 670 above 0,4 1,9 % 9,9% Total AOD 670 0,2 - 0,4 13,2% 21,7% POLDER-3 Total AOD 670 nm range 0,3 0,3 0,3 0,3 Comparison of POLDER AOD at 670 and 865 nm 865 nm 670 nm Coarse non spherical Coarse Fine Fine Nobs (optimal geometric cond.) Nobs (all cond.) Coarse mode non spherical AOD -865 nm and coarse mode AOD -670 nm distributions are similar Using 670 nm allow - to increase the number of observations - to get a better signal for the fine AOD component Year to year evolution of Summer aerosol loads (2005-2012) Fine AOD 670 nm Coarse AOD 670 nm 2005 2006 2007 2008 2009 2010 2011 2012

Transcript of Aerosol variability and properties from POLDER-3/PARASOL...

Page 1: Aerosol variability and properties from POLDER-3/PARASOL ...dustworkshop2013.enea.it/presentations/POSTER_2TRChiapello.pdf · Coarse non spherical AOD 865 nm Total AOD 865 nm 0,3

Coarse non spherical AOD865 nm

Total AOD865 nm

0,3 0,3 0,3 0,3

Number of observations

300 300 300 300

Fine AOD 865 nm

0,1 0,1 0,1 0,1

Aerosol variability and properties from POLDER-3/PARASOL satellite retrievals in the Mediterranean region

Isabelle Chiapello1, Quentin Coopman1, Philippe Goloub1 , Fabrice Ducos1, Didier Tanré1 and François Dulac2 1 Laboratoire d’Optique Atmosphérique, CNRS/Université Lille 1, Villeneuve d’Ascq, France ([email protected]) 2 LSCE, CEA/CNRS/UVSQ Gif-sur-Yvette France

POLDER-3 aerosol retrievals for 2 Mediterranean AERONET/PHOTONS sites Ersa (Corsica) and Lampedusa

Conclusions

Using POLDER for assessment of aerosol variability over the Mediterranean PARASOL is a microsatellite part of the A-TRAIN*. It is carrying POLDER-3 (Polarization and Directionality of the Earth’s Reflectances), a wide-field imaging radiometer/polarimeter providing near-daily observations of aerosol properties since March 2005.

1.  In the Mediterranean region, the aerosol variability retrieved from POLDER-3 is generally consistent with that derived from AERONET/PHOTONS Sunphotometer measurements.

2.  POLDER-3 shows maximum aerosol loads in Spring and Summer, a large influence of African dust especially in the southern part of the basin.

3.  POLDER-3 Fine and Coarse AOD show decreasing trends over the Mediterranean from 2005 to 2012, especially in Summer (JJA).

References. POLDER data: Herman et al., JGR 2005 – AERONET data: Holben et al., JGR 2001. Acknowledgments. We thank the AERONET/PHOTONS group and sites team and the ICARE Data and Services Center for providing access to the data used in this study.

We focus on (i)  Analysis of POLDER-3 aerosol retrievals for 2 AERONET/PHOTONS Sun/Sky photometer

sites in the Mediterranean basin, used as « ground truth » references: ERSA and LAMPEDUSA

(ii)  Analysis of POLDER-3/PARASOL aerosol observations over the Mediterranean Sea

Our final objective is to assess and understand aerosol spatial distribution, temporal variability and recent evolution in the Mediterranean region.

This approach is part of the ChArMEx effort for a global analysis of the influences of precipitations, North Atlantic Oscillation, as well as contributions of different aerosol sources (natural versus anthropic), and impact of extreme events (fires, Saharan dust) on the Mediterranean aerosol loads, both in terms of variability and long-term trends.

POLDER-3 aerosol distribution over the Mediterranean Sea

* PARASOL orbit has been lowered twice in December 2009 and in November 2011

Seasonal variability (2005-2012) Winter (DJF) Spring (MAM) Summer (JJA) Autumn (SON)

Aerosol loads are maximum in Spring (eastern part) and Summer (western part), minimum in Winter and Autumn. Coarse non spherical aerosol dominate the South part of the basin. Fine AOD show generally low to moderate levels (<0,10), slightly increasing in the central and eastern part of the Mediterranean (Summer). Number of values of observations strongly varies from one season to another: maximum in Summer and Spring, minimum in Winter and Autumn.

POLDER has interesting capabilities to derive both aerosol loads (total aerosol optical depth) ans size properties (fine, coarse non spherical AOD) over oceanic surfaces.

4. Understanding POLDER-3 aerosol variability over the Mediterranean will require more investigations on the respective impact of meteorology (North Atlantic Oscillation, rainfall) and human activities on the observed evolution of aerosol loads.

ChArMEx (the Chemistry-Aerosol Mediterranean Experiment; http://charmex.lsce.ipsl.fr/) program focuses on the Mediterranean basin, a marine region under the major influence of aerosol particles from different continental sources (dust from Africa, industrial and urban aerosols from Europe, biogenic secondary organics and biomass burning), in addition to sea-salt and marine biogenic aerosols.

7th International Workshop on Sand/Duststorms and Associated DustFall, 2-4 December 2013, Frascati Italy

AERONET DATA ERSA LAMPEDUSA Position 43°00’14’’ N 35°31’01’’ N

9°21’32’’ E 12°37’55’’ E

Mean AOD 675 nm 0,10 (0,07) 0,15 (0,15)

Mean Angström 1,28 (0,44) 0,94 (0,50)

AOD – Total – 670 nm AOD – Fine – 670 nm POLDER-3 versus AERONET/PHOTONS

AOD Total 670 nm Monthly averages JAN 2005 – DEC 2012 Ersa Lampedusa AERONET

POLDER-3 AERONET POLDER-3

POLDER-3 Fine/Coarse AOD 670 nm Ersa Lampedusa

Maximum total AOD670: June (May-July) April (June) Fine AOD670 range: 25-52% 24-34%

Ersa Lampedusa

Total AOD670 above 0,4 1,9 % 9,9% Total AOD670 0,2 - 0,4 13,2% 21,7%

POLDER-3 Total AOD 670 nm range

0,3 0,3 0,3 0,3

Comparison of POLDER AOD at 670 and 865 nm

865 nm

670 nm

Coarse non spherical

Coarse Fine

Fine Nobs (optimal geometric cond.)

Nobs (all cond.)

Coarse mode non spherical AOD -865 nm and coarse mode AOD -670 nm distributions are similar

Using 670 nm allow - to increase the number of observations - to get a better signal for the fine AOD component

Year to year evolution of Summer aerosol loads (2005-2012)

Fine AOD 670 nm

Coarse AOD 670 nm

2005 2006 2007 2008 2009 2010 2011 2012

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