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Cécile Hannay
1850 Table Mesa Drive, Boulder CO 80305
Phone: 303-497-1327 Fax: 303-497-1348 Email: hannay@ucar.edu
WORK EXPERIENCE
2004 -Present: Associate Scientist at the National Center for Atmospheric Research, Boulder.
Main interest: Representation of clouds in large-scale models.
- Performed simulations and detailed analysis of forecasts to assess various cloud regimes in climate models.
- Detailed comparison of the NCAR and GFDL models in subsidence regimes.
- Responsible for coordination and support of climate simulations for the Climate Process Team (CPT) on Low Latitude Cloud Feedbacks on Climate Sensitivity.
- Maintains a web site for CPT participants.
2001- 2004: Associate Scientist at the Climate Diagnostics Center, Boulder.
Main interest: Sub-grid scale variability of cloud water in large-scale models
- Detailed analysis of Cloud Resolving Model (CRM) simulations of deep convection to characterize internal variability of clouds and water.
- Simulation of shallow convection cloud fields with a Large Eddy Simulation (LES) model.
- Study of 3D radiative transfer effects using Monte Carlo computations.
- Simulation of global climate with the global atmospheric model developed
at the Geophysical Fluid Dynamics Laboratory (GFDL).
- Design, implementation and testing of scientific code for analysis and simulations,
in Fortran 90 on Unix workstations and distributed Linux clusters.
1999-2001: Research Assistant at the University of Alaska, Fairbanks.
Main interest: Simulation of Arctic clouds
- Simulations of Arctic climate with the Single-Column Model of the Community Climate Model (CCM3)
- Evaluation of cloud parameterization over the Arctic and sensitivity studies to cloud microphysics.
- Designed scripts in Matlab and GrADS for climatological data analysis and model output analysis.
- Designed, wrote and tested programs in C, Fortran 77 and Fortran 90 on Unix workstation and PC.
1990-1998: Associate Scientist at the University of Liège, Belgium.
Main interest: Experimental physics
- Implementation and testing of a test bench for calorimetric studies of electric vehicle's batteries.
- Recording and analysis of absorption spectra.
- Design and implementation of a texturing method of superconductors in a magnetic field.
SKILLS
- Experience in running models (e.g. Large-scale models, single column model, LES model, Monte Carlo simulations).
- Demonstrated experience with large climatological data sets and model outputs.
- Extensive experience in designing and implementing functions in Fortran 90.
- Broad experience with UNIX machines, including design of shell scripts.
- Knowledge of graphical and statistical packages (e.g. Matlab, ncl).
- Background in web design development.
EDUCATION
2001 Master's degree in Atmospheric Science. University of Alaska Fairbanks.
Thesis: Single Column Model Simulations of Arctic Cloudiness and Surface Radiative Fluxes during the SHEBA Experiment.
1990 Bachelor's degree in Physics, with thesis. University of Liège, Belgium.
Thesis topic: Paradoxes resulting from the Irreversibility in Physics.
PUBLICATIONS
Wyant, M. C., Wood, R., Bretherton, C. S., Mechoso, C. R., Bacmeister, J., Balmaseda, M. A., Barrett, B., Codron, F., Earnshaw, P., Fast, J., Hannay, C., Kaiser, J. W., Kitagawa, H., Klein, S. A., Köhler, M., Manganello, J., Pan, H.-L., Sun, F., Wang, S., and Wang, Y. (2009)
The PreVOCA Experiment: Modeling the lower troposphere in the Southeast Pacific.
Atmos. Chem. Phys. Discuss., 9, 23909-23953.
[Manuscript]
J. Teixeira, et al. (2009)
Tropical and sub-tropical cloud transitions in weather and climate prediction models: the GCSS/WGNE Pacific Cross-section Intercomparison (GPCI)
Submitted to J. Climate
Cécile Hannay, David L Williamson, James J Hack, Jeffrey T Kiehl, Jerry G Olson, Stephen A Klein, Christopher S Bretherton, and Martin Koehler (2009),
Evaluation of Forecasted Southeast Pacific Stratocumulus in the NCAR, GFDL and ECMWF Models.
J. Climate, 22, 2871-2889.
[Manuscript]
Brian E Mapes, Julio Bacmeister, Marat Khairoutdinov, Cécile Hannay, Ming Zhao (2009),
Virtual Field campaigns on deep tropical convection in climate models.
J. Climate, 22, 244-257.
[Manuscript]
Jeff Kiehl and Cécile Hannay (2006),
Climate Process Team (CPT): Low-Latitude Cloud Feedbacks on Climate Sensitivity.
[NCAR Report]
Robert Pincus, Cécile Hannay, and K. Franklin Evans (2005),
The accuracy of determining three-dimensional radiative transfer effects
in cumulus clouds using ground-based profiling instruments,
Journal of the Atmospheric Sciences, 62, 2284-2293.
[pdf preprint]
Robert Pincus, Cécile Hannay, Stephen A. Klein, and Kuan-Man Xu (2005),
Overlap assumptions for assumed-PDF cloud schemes in large scale models,
Journal of Geophysical Research, doi:10.1029/2004JD005100
[pdf preprint]
Stephen A. Klein, Robert Pincus, Cécile Hannay, and Kuan-Man Xu (2005),
How might a statistical cloud scheme be coupled to a mass-flux convection scheme ?,
Journal of Geophysical Research, doi:10.1029/2004JD005017.
[pdf preprint]
Cécile Hannay, Robert Pincus, K. Frank Evans (2004),
Estimating Three-Dimensional Cloudy Radiative Transfer Effects from Time-Height Cross Sections,
Fourteenth ARM Science Team Meeting, March 22 to 26, 2004, Albuquerque, New Mexico.
[pdf preprint]
Christian Jakob, Robert Pincus, Cécile Hannay, and Kuan-Man Xu (2004),
The use of cloud radar observations for model evaluation: A probabilistic approach,
Journal of Geophysical Research, doi:10.1029/2003JD003473.
[pdf preprint]
Robert Pincus, Stephen A. Klein, Cécile Hannay, Kuan-Man Xu (2002)
Representing cloud vertical structure in large-scale models.
Proceedings of the GCSS Workshop on the Representation of Cloud Systems in Large Scale Models,
Kananaskis, Alberta, 2002.
Cécile Hannay, Uma S. Bhatt (2002)
Simulations of Arctic Cloudiness.
Global Glimpses, Volume 10, No. 1,
[pdf preprint]
Cécile Hannay, Uma S. Bhatt, Jerry Harrington (2001)
Single-Column Model Simulations of Arctic Cloudiness and Surface Radiative Fluxes during the Surface Energy Budget of Arctic (SHEBA) experiment.
Proceedings of the Fifth Conference on Polar Meteorology and oceanography, May 14-18, 2001, San Diego, California.
PRESENTATIONS
Cécile Hannay, Dave Williamson, Jerry Olson, Rich Neale, Sungsu Park and Phil Rasch (2009)
Water vapor budgets in Track 1 and Track 5.
CCSM Meeting, June 15-18, 2009, Breckenridge, Colorado.
[Presentation]
Cécile Hannay et al (2009),
An overview of recent CAM developments.
AMWG Meeting, March 2-4 2009, Boulder, Colorado.
[Presentation]
Cécile Hannay, Dave Williamson, Jerry Olson, Chris Bretherton, Sungsu Park , Matt Wyant and Martin Koehler (2008),
Using satellite and in-situ observations to evaluate short-term forecasts of cloud-topped boundary layers with the Community Atmospheric Model.
AGU Fall meeting, 15-19 December 2008, San Francisco, California.
Cécile Hannay, Dave Williamson, Jerry Olson, Rich Neale, Yaga Richter, Andrew Gettelman, Hugh Morrison, Sungsu Park, Chris Bretherton and Joao Teixeira (2008),
Evaluating parameterized variables in CAM forecasts against satellite data along the GCSS Pacific cross-section.
AGU Fall meeting, 15-19 December 2008, San Francisco, California.
Cécile Hannay (2008),
Challenges in the tuning of the CAM.
CGD Research Reports, December 4 2008, Boulder, Colorado.
Cécile Hannay, Dave Williamson, Jerry Olson, Rich Neale, Andrew Gettelman, Hugh Morrison, Sungsu Park and Chris Bretherton (2008),
Short Term forecasts along the GCSS Pacific Cross-section: Evaluating new Parameterizations in the Community Atmospheric Model.
13th Annual CCSM Workshop, 17-19 June 2008, Breckenridge, Colorado.
Cécile Hannay, Dave Williamson, Jerry Olson, Rich Neale, Andrew Gettelman, Hugh Morrison, Sungsu Park and Chris Bretherton (2008),
Short Term forecasts along the GCSS Pacific Cross-section: Evaluating new Parameterizations in the Community Atmospheric Model.
4th PAN-GCSS Meeting on advances in modeling and observing clouds and convection, 2-6 June 2008, Toulouse, France.
[Presentation]
Cécile Hannay (2007),
Forecasts of Southeast Pacific Stratocumulus with the NCAR, GFDL and ECMWF Models.
CGD Research Reports, November 11 2007, Boulder, Colorado.
Cécile Hannay, Dave Williamson, Jim Hack, Jeff Kiehl, Jerry Olson, Chris Bretherton, Steve Klein and Martin Koehler (2007),
Forecasts of the East Pacific Investigation of Climate (EPIC) column with the NCAR, GFDL and ECMWF Models,
12th Annual CCSM Workshop, 19-21 June 2007, Breckenridge, Colorado.
[Presentation]
Cécile Hannay, Dave Williamson, Jim Hack, Jeff Kiehl, Jerry Olson, Chris Bretherton, Steve Klein and Martin Koehler (2007),
Forecasts of Southeast Pacific Stratocumulus with the NCAR, GFDL and ECMWF Models,
3rd WGNE Workshop on Systematic Errors in Climate and NWP Models, February 12-16, 2007, San Francisco, California.
[Presentation]
Cécile Hannay, Dave Williamson, Jerry Olson, Jim Hack and Jeff Kiehl (2007),
Sensitivity to the CAM candidate schemes in climate and forecast runs along the Pacific Cross-section,
CCSM Atmosphere Model Working Group (AMWG) Meeting, 29-31 January 2007, NCAR, Boulder, Colorado.
[Presentation]
Cécile Hannay, Jeff Kiehl, Dave Williamson, Jerry Olson, Jim Hack, Richard Neale and Chris Bretherton (2006),
Sensitivity to the PBL and convective schemes in forecasts with CAM along the Pacific Cross-section,
Joint GCSS-GPCI/BLCL-RICO Workshop, 18-21 September 2006, NASA/GISS, New York.
[Presentation]
Cécile Hannay, Jeff Kiehl, Dave Williamson, Jerry Olson, Jim Hack, and Chris Bretherton (2006),
Forecast simulations of Southeast Pacific Stratocumulus with CAM3 and CAM3-UW.
11th Annual CCSM Workshop, 20-22 June 2006, Breckenridge, Colorado.
[Poster]
Cécile Hannay (2006),
Forecast runs for a Pacific Cross-section.
CGD Research Reports, January 19 2006, Boulder, Colorado.
Cécile Hannay, Jeffrey Kiehl, James Hack, Ping Zhu and Karen Shell (2005),
Cloud diagnostics in subsidence regions: comparison of the NCAR and GFDL models versus observations and reanalysis,
3rd PAN-GCSS meeting on Clouds, Climate and Models,16-20 May 2005, Athens, Greece.
[Talk and
Poster]
Cécile Hannay, Robert Pincus, K. Frank Evans (2004),
Estimating Three-Dimensional Cloudy Radiative Transfer Effects from Time-Height Cross Sections,
Fourteenth ARM Science Team Meeting, March 22 to 26, 2004, Albuquerque, New Mexico.
[pdf preprint]
Cécile Hannay, Uma S. Bhatt, Jerry Harrington (2001) Single-Column Model
Simulations of Arctic Cloudiness and Surface Radiative Fluxes during the
Surface Energy Budget of Arctic (SHEBA) experiment. Proceedings of the
Fifth Conference on Polar Meteorology and oceanography, May 14-18, 2001,
San Diego, California.
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