Lucia Deaconu
PhD in Physics
thesis defended on 19th December 2017
Laboratoire d'Optique Atmosphérique - LOA

Title and thesis summary
Publications
Oral & posters presentation

Future

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Title and thesis summary

Study of multi-layer “aerosol” situations and “aerosol-cloud” interaction

One of the main objectives of this study is to analyze the consistency between the aerosol above clouds (AAC) retrievals from passive and active satellite measurements. We consider the method based on the passive polarization measurements provided by the POLDER instrument, the operational method developed for the space borne lidar CALIOP, and the CALIOP-based depolarization ratio method (DRM), for which we also propose a calibrated version. We perform a regional analysis and a global multi-annual analysis to provide robust statistics results. Our findings show good agreement between DRM and POLDER AOT retrievals (R2=0.68 at global scale). This result gives confidence in our ability to measure the properties of AAC. Differences occur when the aerosol and cloud layers are in contact. CALIOP operational method is largely underestimating the above cloud AOT, compared to the other two methods.

 

 

 

 

 

 

 

 

 

 

 

Click on the picture to enlarge it

The second objective is to study the impact of aerosols on the cloud properties and their radiative forcing, over the South Atlantic Ocean. We perform a synergy between CALIOP vertical profiles and POLDER retrievals, with collocated meteorological parameters. We performed radiative transfer calculations in the short- and longwave domains, and analyzed the effect of aerosol loading on the cloud properties and meteorology. We found that aerosols and water vapor effects could impact the cloud convection. Our results show that under large loads of AACs, clouds become optically thicker, with an increase in liquid water path of 20 g.m-2 and their cloud top altitudes are lower by 200 m, which may indicate a potential semi-direct effect of aerosols above clouds.

Thesis supervisor : Philippe GOLOUB1
Co-supervisor :
Fabien WAQUET1, Nicolas FERLAY1
Referees : Cyrille FLAMANT2, Paquita ZUIDEMA3
Examiners : Didier TANRE1, Marc MALLET4, Nicolas BELLOUIN5
Invited member : Damien JOSSET6

1LOA, University of Lille
2LATMOS, University Pierre et Marie Curie, Paris
3Rosenstiel School of Marine and Atmospheric Science, Miami, USA
4Météo France, Toulouse
5University of Reading, Reading, UK
6NASA Stennis Space Center, USA

Laboratory: LOA

Financing: Université Lille 1 / Labex CaPPA

 


Publications

Deaconu, L. T., Waquet, F., Josset, D., Ferlay, N., Peers, F., Thieuleux, F., Ducos, F., Pascal, N., Tanré, D., Pelon, J., and Goloub, P.: Consistency of aerosols above clouds characterization from A-Train active and passive measurements, Atmos. Meas. Tech., 10, 3499-3523, https://doi.org/10.5194/amt-10-3499-2017, 2017.

Cornet, C., C-Labonnote, L., Szczap, F., Deaconu, L., Waquet, F., Parol, F., Vanbauce, C., Thieuleux, F., and Riédi, J.: Cloud heterogeneity effects on cloud and aerosol above cloud properties retrieved from simulated total and polarized reflectances, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-413, in review, 2017.

 


Oral and posters presentation

Best poster award
Best poster : Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Peers, F., Ducos F., Thieuleux F., Comparison of active and passive A-Train sensors used in aerosols above clouds retrievals and characterization, ICAC Conference, 23-27 March 2017, Villeneuve d’Ascq, France
see photo opposite


Oral presentations

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Peers, F., Ducos F., Thieuleux F., Tanré D., Pelon J., Goloub P.: Consistency of aerosols above clouds characterization from active and passive A-Train sensors, A-Train Symposium, 18-23 April 2017, Pasadena, California.

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Peers, F., Ducos F., Thieuleux F.: Optical depth retrieval for aerosol over cloud: passive vs. active methods and applications for the study of aerosol-cloud interactions, IRePSE Conference, 11 July 2016, Villeneuve d’Ascq, France.

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Ducos F., Thieuleux F.: Optical depth retrieval for aerosol over cloud: passive vs. active methods and applications for the study of aerosol-cloud interactions, 11th International Conference ELSEDIMA “Environmental Legislation, Safety Engineering And Disaster Management”, 28 May 2016, Cluj-Napoca, Romania.

Waquet F., Peers F., Deaconu L., Cornet C., Ducos F., Thieuleux F., Goloub P., Riedi J., Labonnote L., Tanré D., ICARE: Detection of aerosols in cloudy scenes: properties and climate impact, PNTS 2013-10, Novembre 2016.

 

Posters

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Peers, F., Ducos F., Thieuleux F., Comparison of active and passive A-Train sensors used in aerosols above clouds retrievals and characterization, ICAC Conference, 23-27 March 2017, Villeneuve d’Ascq, France;

Cornet C., F. Szczap, L. C-Labonnote F. Waquet, L. Deaconu, F. Parol, J. Riédi, F. Thieuleux: Assessments of Cloud Heterogeneity Effects on the POLDER3/PARASOL retrieved cloud parameters, JpGU-AGU joint meeting, Montréal, 20-25 mai 2017;

Cornet C. L. C-Labonnote, F. Szczap, F. Waquet, L. Deaconu, F. Parol, J. Riédi, F. Thieuleux: Cloud Heterogeneity Effects on the POLDER3/PARASOL measurements and consequences on the cloud parameters and aerosol above cloud retrievals, A-Train Meeting, Pasadena, 19-21 avril 2017;

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Ducos F., Thieuleux F.: Optical depth retrieval for aerosol over cloud: passive vs. active methods and applications for the study of aerosol-cloud interactions, 3eme Journée Scientifique Labex CaPPA, 25 February 2016, Villeneuve d’Ascq, France;

Deaconu L., Waquet F., Josset D., Ferlay N., Pascal N., Goloub P., Ducos F., Thieuleux F., Optical depth retrieval for aerosol over cloud: passive vs. active methods and applications for the study of aerosol-cloud interactions, 3eme Journée Scientifique Labex CaPPA, 25 February 2016, Villeneuve d’Ascq, France;

Deaconu L., Waquet F., Ferlay N., Goloub P., Josset D., Study on indirect and semi-direct effect of aerosols on clouds, IRePSE Conference, 8 July 2015, Villeneuve d’Ascq, France;

Deaconu L., Waquet F., Ferlay N., Goloub P., Josset D., Study on ‘multi-layer’ situations and on aerosol-cloud interactions, 2eme Journée Scientifique Labex CaPPA, 17 February 2015, Villeneuve d’Ascq, France;

Peers F., Waquet F., Deaconu L., Dubuisson P., Ducos F., Goloub P., Josset D., Labonnote L, Riédi J., Tanré D., Thieuleux F.: Properties and Impact of Aerosols Above Clouds, American Geophysical Union (AGU) Conference, San Francisco, California 9-13 December 2013.

 

 


Future

Looking for a post-doc in Europe and Asia, expand expertise in modelling and ground based measurements of aerosols and clouds
--> contact Lucia DEACONU

 

download her CV - Linked In - Research Gate