Cheng Chen
PhD in Physics
thesis defended on 31st January 2018
Laboratoire d'Optique Atmosphérique - LOA

Title and thesis summary
Publications
Oral & posters presentation

Future

 


Title and thesis summary

Retrieving global sources of aerosol emission from satellite observations

Understanding of the role that atmospheric aerosol play in the Earth-atmosphere system is limited by uncertainties in aerosol distribution, composition and sources. Thus, accurate chemical transport model simulation systems are crucial needed to analyse and predict atmospheric aerosols and their impacts on climate change and environment. Satellite observations have ability to provide an extensive spatial coverage and accurate aerosol products, however, are constrained by clear-sky condition, global coverage orbit cycle and information content. One of the most promising approaches is to reduce model uncertainty by improving the aerosol emission fields (i.e., model input) by means of inverse modeling relying on satellite observations as a constrain. In this study, we designed a method of simultaneous retrievals of desert dust, black carbon and organic carbon aerosol emission sources using aerosol data obtained from GRASP algorithm applied to POLDER/PARASOL satellite observations, and relying on the GEOS-Chem inverse modeling framework. Then, a satellite-based global aerosol emission database (2006-2011) has been developed. This aerosol emission database has been further evaluated by utilization in GEOS-Chem and GEOS-5/GOCART models. The model posterior simulation of aerosol properties employing the retrieved emissions shows a better agreement than the model prior simulation; it is true for not only fitted PARASOL products, but also for completely independent measurements from ground-based AERONET and satellites aerosol products (e.g., MODIS, MISR, OMI). The results suggest that the satellite-based aerosol emission database improves overall global aerosol modeling.

 

Thesis supervisor(s) :
Oleg DUBOVIK, Directeur de recherche CNRS, CNRS/University of Lille

Referees :
Mian CHIN, Senior Scientist, NASA Goddard Space Flight Center
Gregory L. SCHUSTER, Senior Scientist, NASA Langley Research Center

Examiners :
Didier TANRÉ, Directeur de recherche CNRS, CNRS/University of Lille
Lorraine A. REMER, Professor, University of Maryland, Baltimore
Oliver BOUCHER, Directeur de recherche CNRS, Institut Pierre-Simon Laplace
Daven K. HENZE, Associate Professor, University of Colorado, Boulder

 

Keywords: Aerosol emission sources, GEOS-Chem, Adjoint, GRASP, Inverse Modeling

Laboratory: LOA

Publications

Cheng Chen, Oleg Dubovik, Daven K. Henze, Tatyana Lapyonak, Mian Chin, Fabrice Ducos, Pavel Litvinov, Xin Huang, and Lei Li : Retrieval of desert dust and carbonaceous aerosol emissions over Africa from POLDER/PARASOL products generated by the GRASP algorithm ; Atmospheric Chemistry and Physics ; https://doi.org/10.5194/acp-18-12551-2018

Chen, C., Dubovik, O., Henze, D. K., Lapyonak, T., Ducos, F., and Huang, X.:  Retrieval Desert Dust and Carbonaceous Aerosol Emissions over Africa from PARASOL/GRASP Observations, In AGU Fall Meeting Abstracts. 2016.

Chen, C., Dubovik, O., Henze, D. K., Lapyonak, T., Chin, M., Ducos, F., Litvinov, P., Huang, X., and Li, L.: Retrieval of Desert Dust and Carbonaceous Aerosol Emissions over Africa from POLDER/PARASOL Products Generated by GRASP Algorithm, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-35, 2018.

Oral and posters presentation

  1. Chen C., Dubovik O., Lapyonak T., Henze D. K., Chin M., Litvinov P. and Ducos F., Desert dust and primary carbonaceous aerosol emissions inferred from polarimetric PARASOL/GRASP observations, October 27th, 2017, 1st International Workshop on “Advancement of polarimetric observations: calibration and improved aerosol retrievals” (APOLO 2017), Hefei China

  2. Chen C., Dubovik O., Lapyonak T., Henze D. K., Chin M., Ducos F., Kucsera T. and Bian H., A satellite view of global desert dust and primary carbonaceous aerosol emission database (2006-2011), October 10th, 2017, Aerosol Comparison between Observations and Models (AEROCOM 16th), Helsinki Finland

  3. Chen C., Dubovik O., Lapyonak T., Henze D. K., Chin M., Lei L., Derimian Y. and Ducos F., Inferring emissions of desert dust and primary carbonaceous aerosol from PARASOL/GRASP retrievals, June 28th, 2017, International Cooperative for Aerosol Predication (ICAP 9th), Lille France

  4. Chen C., Dubovik O., Lapyonak T., Henze D. K., Ducos F. and Chin M., Desert dust and carbonaceous aerosol emissions inferred from PARASOL/GRASP observations, March 22nd, International Conference on Aerosol Cycle (ICAC 2017), Lille France

  5. Chen C., Dubovik O., Lapyonak T., Henze D. K., Ducos F. and Huang X., Retrieval desert dust and carbonaceous aerosol emissions over Africa from PARASOL/GRASP observations, AGU Fall Meeting, 2016, San Francisco, USA

  6. Chen C., Dubovik O., Lapyonak T., Ducos F. and Henze D. K., Retrieval desert dust and carbonaceous aerosol emissions from PARASOL/GRASP observations, Conseil Scientifique CaPPA, July 7th, 2016, Amphi. CERLA, Lille, France

  7. Chen C., Dubovik O., Lapyonak T., Ducos F. and Henze D. K., Characterization of aerosol emission from PARASOL observations using inversing modeling: concept and progress, 2ème Journée Scientifique Labex CaPPA, Februray 17th, 2015, Polytech Lille - Campus Universitaire Lille1, Lille, France

  8. Dubovik, O., Chen, C., Lapyonok, T., Henze, D. K., Ducos, F. and Huang, X., Retrieval of Carbonaceous Aerosol and Desert Dust and Emissions over Africa from enhanced PARASOL/GRASP aerosol retrievals, Workshop on “Recent Advances in the Understanding of Black Carbon Atmospheric Processes, Radiative Forcing and Climate Impact”, CICERO, Oslo, Norwey, January 16th-17th, 2017. (INVITED PRESENTATION).

  9. Dubovik, O., Litvinov, P., Lapyonok, T., Lopatin, A., Fuertes, D., Ducos, F., Huang, X., Torres, B., Hu, Q., Derimian, Y., Chen, C., Li, L., Aspsetsberger, M. and Federspiel, C., Status of versatile GRASP retrieval algorithm, 9-th ICAP, Lille, France, 26 - 28 June, 2017. (INVITED PRESENTATION).

  10. Chin, M., Bian, H., Kucsera, T., Jethva, H., Torres, O., Dubovik, O., Litvinov, P., Lapyonok, T., Ducos, F., Fuertes, D. and Chen, C., Light absorption by dust, biomass burning and pollution aerosols from POLDER and OMI: A global model analysis, 1st International Workshop on “Advancement of polarimetric observations: calibration and improved aerosol retrievals” (APOLO 2017), Hefei China, October 23-26th, 2017. (INVITED PRESENTATION).

Future

Cheng Chen is currently doing a postdoc at LOA.
Contact him per e-mail.