Cynthia A Randles

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Cynthia A Randles

  • VISITING FELLOW
  • 301.614.5454
  • NASA/GSFC
  • Mail Code: 610.1
  • Greenbelt , MD 20771
  • Employer: Science Collaborator
  • Brief Bio

    Dr. Randles received a S.B. in Earth, Atmospheric, and Planetary Sciences from the Massachusetts Institute of Technology (MIT) in 2000. She received an M.A. and Ph.D. in Atmospheric and Oceanic Sciences from Princeton University in 2004 and 2007, respectively. Beginning in 2007, she was a University of Maryland Baltimore County (UMBC)/Goddard Earth Sciences & Technology Center (GEST) Goddard Visiting Fellow in the Atmospheric Chemistry and Dynamics Lab (Code 613.3, now 614) at NASA Goddard Space flight Center (GSFC). She continued working in Code 614 in 2008 after being awarded a NASA Postdoctoral Fellowship Between August 2009 and May 2011, she was an Assistant Research Scientist at UMBC GEST in Code 614 at GSFC. As of May 2011, she is an Assistant Research Scientist in Code 614 through GESTAR and Morgan State University. Previous work at NASA has focused on comparing and contrasting the response of the NASA GEOS Earth Observing System (GEOS-5) general circulation model (GCM) to interactive and climatological aerosol forcing. Currently, she is the PI of a NASA ACMA-funded project using GEOS-5 to investigate the sensitivity of aerosol direct and semi-direct effects and the GEOS-5 Incremental Analysis Update (IAU) to changes in biomass burning aerosol properties. She is also co-investigator on a seasonal forecasting project for the NASA SEAC4RS mission. As lead author of the AeroCom Radiative Transfer Code experiment, she has been responsible for coordinating the efforts of over 32 international collaborators examining the accuracy of 28 global aerosol model radiative transfer schemes.

    Education

    11/07 Ph. D.,       Program in Atmospheric and Oceanic Sciences                      Princeton University
                                Research Advisor: V. Ramaswamy (NOAA Geophysical Fluid Dynamics Laboratory)

    01/04 M. A.,        Program in Atmospheric and Oceanic Sciences                      Princeton University
                                Research Advisors: V. Ramaswamy (NOAA GFDL) and L. M. Russell
                               (Princeton University)

    06/00 S. B.,         School of Science                                     Massachusetts Institute of Technology
                               Major: Earth, Atmospheric, and Planetary Sciences

    Positions/Employment

    5/2011 - Present

    Assistant Research Scientist

    Goddard Earth Sciences Technology and Research (GESTAR)/Morgan State University (MSU), NASA Goddard Space Flight Center Atmospheric Chemistry and Dynamics Laboratory

    Novel use of the NASA GEOS-5 Data Assimilation System (DAS) Analysis Update (AU) – an indication of model error – to improve estimates of the direct and semi-direct effects of biomass burning aerosol over southern Africa. Led a major AeroCom international inter-comparison of 31 global aerosol model radiative transfer schemes that is cited in the latest IPCC AR5 report.
    8/2009 - 4/2011

    Assistant Research Scientist

    Goddard Earth Sciences and Technology Center (GEST)/University of Maryland, Baltimore County , NASA Goddard Space Flight Center Atmospheric Chemistry and Dynamics Laboratory

    Investigated aerosol-radiation-climate interactions using the NASA GEOS-5 atmospheric general circulation model (AGCM) with fully coupled on-line GOCART (Goddard Chemistry Aerosol Radiation and Transport) aerosols. Improved the representation of aerosol properties in GEOS-5 relative to satellite observations by revising various parameterizations (e.g. treatment of aerosol hygroscopic growth).
    10/2008 - 8/2009

    NASA Postdoctoral Program Fellow

    Oak Ridge Associated Universities/NASA GSFC Atmospheric Chemistry & Dynamics Lab, NASA GSFC Atmospheric Chemistry & Dynamics Lab

    Examined the influence of present-day weather and climate variability on the transport and deposition of anthropogenic aerosols using the NASA GEOS-5 AGCM. Implemented a parameterization for aerosol convective scavenging in GEOS-5.
    10/2007 - 9/2008

    Goddard Visiting Fellow

    Goddard Earth Sciences and Technology Center (GEST)/University of Maryland, Baltimore County , NASA GSFC Atmospheric Chemistry & Dynamics Lab

    Used satellite and ground-based aerosol observations to evaluate aerosol properties in the NASA GEOS-5 AGCM. Measured aerosol optical depth (AOD) using AERONET sun-photometers during the NASA TIGERZ field campaign in northern India.
    9/2001 - 10/2007

    Graduate Research Assistant

    Princeton University Program in Atmospheric and Oceanic Sciences, Princeton University/NOAA Geophysical Dynamics Laboratory (GFDL)

    Dissertation Title:
    “Impacts of carbonaceous aerosols on climate: Examination of the sensitivity of simulated regional climates to absorbing and scattering aerosols”
    Used a diverse suite of numerical models, including the GFDL AM2 atmospheric general circulation model, to explore the effects of absorbing black carbon aerosol on the climate in Asia and southern Africa, focusing particularly on the response of the hydrologic cycle and the surface energy balance to aerosol forcing.
     
    Master’s Research: “Hygroscopic and optical properties of organic sea salt aerosol internal mixtures and consequences for climate forcing”
    Investigated the sensitivity of aerosol hygroscopic growth and radiative forcing to internal mixtures of sea salt and water-soluble organic carbon (WSOC) using a detailed aerosol thermodynamic equilibrium model coupled to a Mie-scattering model.
    3/2004 - 11/2004

    Visiting Scholar

    Atmospheric Aerosol Group, Scripps Institution of Oceanography/University of California San Diego (UCSD)

    Developed instrumentation to collect bulk aerosol filter samples for organic functional group analysis using Fourier Transform Infrared Spectroscopy (FTIR). Measured ambient aerosol size distributions using a Scanning Mobility Particle Sizer (SMPS) system deployed on Appledore Island, Maine during the ICARTT international field campaign.
    5/1999 - 8/2001

    Summer Undergraduate Research Experience

    Department of Energy, Brookhaven National Laboratory (BNL), Aerodyne Research, Inc. (ARI), and Argonne National Laboratory (ANL)

    BNL (Summer 2001): Explored the composition of individual aerosol particles during a field study (PMTACS-NY) in Queens, New York using a single-particle mass spectrometer (SPLAT-MS). ARI (Summer 2000): Fabricated parts for the Aerodyne aerosol mass spectrometer (AMS) and sampled ambient single-particle composition during the TEXAQS2000 field study in Houston, Texas. ANL (Summer 1999): Developed a computer algorithm for automatic retrieval of atmospheric boundary layer height using lidar data from the DOE Atmospheric Radiation Measurement (ARM) program. Released ozone sonde balloons during the DOE Northeastern Ozone Particle study in New Jersey.

    Grants

    01/25/2012 - 01/24/2015 NASA CloudSat and CALIPSO Science Team Recompete, NASA , NASA NRA #: NNH12ZDA001N-CCST
    Assimilating CALIPSO Observations in GEOS-5 for Improving Integrated Earth System Analysis (IESA): Application to Aerosol Forcing of Climate
    ; Co-Investigator ; 0.1 FTE
    Grant Amount: $484,965
    04/13/2013 - 04/13/2016 NASA Atmospheric Composition: Modeling and Analsysis, NASA , NASA NRA #: NNH12ZDA001N-ACMAP
    Diagnosing uncertainty in the aerosol direct radiative effect with the NASA GEOS-5 model and NASA satellite observations
    ; Co-Investigator ; 0.25 FTE
    Grant Amount: $333,382
    07/01/2011 - 07/01/2014 NASA SEAC4RS, NASA , NASA NRA #: NNH10ZDA001N-SEAC4RS
    GEOS-5 Chemical and Meteorological Forecasting Support for the Southeast Asia Composition, Cloud, Climate Coupling Regional Study (SEAC4RS)
    ; Co-Investigator ; 0.25 FTE
    Grant Amount: $479,255
    06/17/2011 - 06/16/2014 NASA Atmospheric Composition: Modeling and Analysis, NASA , NASA NRA #: NNH10ZDA001N-ACMAP
    Improving Estimates of Biomass Burning Aerosol Direct and Semi-Direct Effects Using the GEOS-5 Incremental Analysis Update (IAU)
    ; Principal Investigator ; 0.5 FTE
    Grant Amount: $310,160
    07/24/2009 - 07/24/2013 NASA Modeling Analysis and Prediction, NASA , NASA NRA #: NNH08ZDA001N-MAP
    Improvements in Aerosol Microphysics, Radiation, and Chemical Interaction in the GEOS Chemistry-Climate Model: Applications to Atmospheric Brown Clouds
    ; Co-Investigator ; 1.0 FTE
    Grant Amount: $969,686

    Awards

    2014                  Excellence in GESTAR Mission Achievement Award
    2009                  NASA Joint Center for Satellite Data Assimilation (JCSDA) Summer Colloquium on
                              Data Assimilation (competitively funded participant)
    2008 – 2009      NASA Postdoctoral Program Fellowship at the NASA Goddard Space Flight Center
    2008                  Dissertation Initiative for the Advancement of Climate Change Research (DISCCRS) IV
                              Symposium (competitively funded participant)
    2007 – 2008      Goddard Earth Sciences and Technology Center (GEST) Goddard Visiting Fellowship
    2006 – 2007      Department of Energy Marvin L. Wesely Distinguished Graduate Research
                              Environmental Fellowship
    2006                  American Meteorological Society Summer Policy Colloquium
                             (competitively funded participant)
    2003                 Gordan Research Conference on Solar Radiation and Climate Chair’s Fund recipient
    2002                 National Center for Atmospheric Research Advanced Studies Program summer
                             colloquium on “Interactions among Aerosols, Climate and the Hydrological Cycle”
                             (competitively funded participant)
    2001 – 2006     Department of Energy Graduate Research Environmental Fellowship
    2001 – 2006     Princeton University Graduate Student Merit Prize
    2001 – 2002     Princeton First Year Graduate Student Fellowship in Science and Engineering
    1995 – 2000     US Air Force Type I (Full) Scholarship for undergraduate study at MIT

    Selected Publications

    Refereed

    Matsui, T., C. M. Ichoku, C. A. Randles, et al. T. L. Yuan, A. M. Da Silva, P. R. Colarco, D. Kim, R. C. Levy, A. M. Sayer, M. Chin, D. Giles, B. N. Holben, E. J. Welton, T. F. Eck, and L. A. Remer. 2014. "Current and Future Perspectives of Aerosol Research at NASA Goddard Space Flight Center." Bulletin of the American Meteorological Society, early view [10.1175/ BAMS-D-13-00153.1]

    Colarco, P. R., E. P. Nowottnick, C. A. Randles, et al. B. Yi, P. Yang, K.-M. Kim, J. Smith, and C. Bardeen. 2014. "Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index." J. Geophys. Res. Atmos., 119 (2): 753-786 [10.1002/2013JD020046]

    Randles, C. A., P. R. Colarco, and A. M. Da Silva. 2013. "Direct and semi-direct aerosol effects in the NASA GEOS-5 AGCM: aerosol-climate interactions due to prognostic versus prescribed aerosols." J. Geophys. Res. Atmos., 118 (1): 149–169 [10.1029/2012JD018388]

    Randles, C. A., S. Kinne, G. Myhre, et al. M. Schulz, J. Fischer, L. Doppler, E. Highwood, C. Ryder, B. Harris, J. Huttunen, Y. Ma, R. T. Pinker, B. Mayer, D. Neubauer, R. Hitzenberger, L. Oreopoulos, D. Lee, G. Pitari, G. DiGenova, J. Quaas, F. G. Rose, S. Kato, S. T. Rumbold, I. Vardavas, N. Hatzianastassiou, C. Matsoukas, H. Yu, F. Zhang, H. Zhang, and P. Lu. 2013. "Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment." Atmos. Chem. Phys., 13 (5): 2347-2379 [10.5194/acp-13-2347-2013]

    Stier, P., N. Schutgens, N. Bellouin, et al. H. Bian, O. Boucher, M. Chin, S. Ghan, N. Huneeus, S. A. Kinne, G. Lin, X. Ma, G. Myhre, J. Penner, C. A. Randles, B. Samset, M. Schulz, T. Takemura, F. Yu, H. Yu, and C. Zhou. 2013. "Host model uncertainties in aerosol radiative forcing estimates: results from the AeroCom Prescribed intercomparison study." Atmos. Chem. Phys., 13 (6): 3245-3270 [10.5194/acp-13-3245-2013]

    Randles, C. A., and V. Ramaswamy. 2010. "Direct and semi-direct impacts of absorbing biomass burning aerosol on the climate of southern Africa: a Geophysical Fluid Dynamics Laboratory GCM sensitivity study." Atmos. Chem. Phys., 10 (20): 9819-9831 [10.5194/acp-10-9819-2010]

    Ott, L., B. N. Duncan, S. Pawson, et al. P. Colarco, M. Chin, C. A. Randles, T. Diehl, and E. Nielsen. 2010. "Influence of the 2006 Indonesian biomass burning aerosols on tropical dynamics studied with the GEOS-5 AGCM." J Geophys Res, 115 (D14): D14121 [10.1029/2009JD013181]

    Randles, C. A., and V. Ramaswamy. 2008. "Absorbing aerosols over Asia: A Geophysical Fluid Dynamics Laboratory general circulation model sensitivity study of model response to aerosol optical depth and aerosol absorption." J. Geophys. Res., 113 (D21): D21203 [10.1029/2008JD010140]

    Randles, C. A., V. Ramaswamy, and L. M. Russell. 2004. "Hygroscopic and optical properties of organic sea salt aerosol and consequences for climate forcing." Geophysical Research Letters, 31 (16): L16108 [10.1029/2004GL020628]

    Talks, Presentations and Posters

    Invited

    Randles, C. A., P. R. Colarco, and A. da Silva, Aerosol Absorption Effects on Climate, Global Modeling and Assimilation Office Seminar. 2014
    Randles, C. A., Peter Colarco, and Arlindo da Silva, Simulating aerosol-climate interactions in the NASA AGCM, AOSC Seminar, University of Maryland College Park. 2013
    Randles, C. A., Aerosol absorption effects on simulated climate in GEOS-5, NASA Climate and Radiation Laboratory Seminar. 2013
    Randles, C. A., et al., Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: Results from the AeroCom Radiative Transfer Experiment, 11th AeroCom Meeting. 2012
    Randles, C. A., Peter Colarco, and Arlindo da Silva, Aerosol-climate coupling in the NASA GEOS-5 AGCM: Aerosol direct and semi-direct effects, Gordon Research Conference and Gordon-Kenan Research Seminar on Radiation and Climate. 2011
    Randles, C. A., Climate impacts of tropospheric aerosols, Dissertation Initiative for the Advancement of Climate Change Research (DISCCRS) V Symposium. 2008
    Randles, C. A. and V. Ramaswamy, Asian Aerosols: A Geophysical Fluid Dynamics Laboratory general circulation model sensitivity study of model response to aerosol optical depth and aerosol absorption, 2007 Fall American Geophysical Union Meeting. 2007

    Other

    Randles, C.A., Peter Colarco, and Arlindo da Silva, A novel approach to improving estimates of the direct and semi-direct effects of biomass burning aerosol: The NASA GEOS-5 Incremental Analysis Update (IAU), (poster), 93rd American Meteorological Society Annual Meeting. 2013
    Randles, C. A. and V. Ramaswamy, Impacts of biomass burning aerosol on the climate of southern Africa: A Geophysical Fluid Dynamics Laboratory GCM Sensitivity Study, 9th International Conference on Southern Hemisphere Meteorology and Oceanography. 2009
    Randles, C. A., L. M. Russell, and V. Ramaswamy, Hygroscopic and optical properties of organic sea salt aerosol and consequences for climate forcing, 8th International Global Atmospheric Chemistry Conference. 2004

    Teaching Experience

    2006 – 2007 Graduate Assistant in Instruction, Department of Geosciences
                         Princeton University
                         Teaching assistant (2006), Laboratory instructor (2007) for “Oceanography: An
                         Introduction  to the World’s Oceans” (GEO202A/B), Professor: Jorge L. Sarmiento
                         Duties included grading problem sets, exams, and term papers, small group tutoring,
                         and teaching weekly laboratory sections.
    2007             Science Outreach
                         New Jersey Science Olympiad
                         Served as test preparer and judge for local Science Olympiad competition on
                         meteorology for middle and high school students.

    Professional Societies

    American Geophysical Union, 2007 - Present
    American Meteorological Society, 2006 - Present
    Earth Science Women's Network, 2008 - Present

    Special Experience

    FIELD CAMPAIGN EXPERIENCE
    DOE ACP Northeastern Ozone Particle study (ozone sondes), PMTACS-NY (DOE SPLAT-MS), TEXAQS 2000 (ARI AMS), ICARTT (SMPS/CPC/FTIR), TIGERZ (AERONET sun photometers), SEAC4RS (GEOS-5 constituent forecasting)

    SKILLS
    Python, IDL, MatLab, GrADS, C, FORTRAN90, Igor Pro, Adobe Illustrator, LaTeX, English Language Scientific Editing

    Brief Bio

    Dr. Randles received a S.B. in Earth, Atmospheric, and Planetary Sciences from the Massachusetts Institute of Technology (MIT) in 2000. She received an M.A. and Ph.D. in Atmospheric and Oceanic Sciences from Princeton University in 2004 and 2007, respectively. Beginning in 2007, she was a University of Maryland Baltimore County (UMBC)/Goddard Earth Sciences & Technology Center (GEST) Goddard Visiting Fellow in the Atmospheric Chemistry and Dynamics Lab (Code 613.3, now 614) at NASA Goddard Space flight Center (GSFC). She continued working in Code 614 in 2008 after being awarded a NASA Postdoctoral Fellowship Between August 2009 and May 2011, she was an Assistant Research Scientist at UMBC GEST in Code 614 at GSFC. As of May 2011, she is an Assistant Research Scientist in Code 614 through GESTAR and Morgan State University. Previous work at NASA has focused on comparing and contrasting the response of the NASA GEOS Earth Observing System (GEOS-5) general circulation model (GCM) to interactive and climatological aerosol forcing. Currently, she is the PI of a NASA ACMA-funded project using GEOS-5 to investigate the sensitivity of aerosol direct and semi-direct effects and the GEOS-5 Incremental Analysis Update (IAU) to changes in biomass burning aerosol properties. She is also co-investigator on a seasonal forecasting project for the NASA SEAC4RS mission. As lead author of the AeroCom Radiative Transfer Code experiment, she has been responsible for coordinating the efforts of over 32 international collaborators examining the accuracy of 28 global aerosol model radiative transfer schemes.

    Selected Publications

    Refereed

    Matsui, T., C. M. Ichoku, C. A. Randles, et al. T. L. Yuan, A. M. Da Silva, P. R. Colarco, D. Kim, R. C. Levy, A. M. Sayer, M. Chin, D. Giles, B. N. Holben, E. J. Welton, T. F. Eck, and L. A. Remer. 2014. "Current and Future Perspectives of Aerosol Research at NASA Goddard Space Flight Center." Bulletin of the American Meteorological Society early view [10.1175/ BAMS-D-13-00153.1]

    Colarco, P. R., E. P. Nowottnick, C. A. Randles, et al. B. Yi, P. Yang, K.-M. Kim, J. Smith, and C. Bardeen. 2014. "Impact of radiatively interactive dust aerosols in the NASA GEOS-5 climate model: Sensitivity to dust particle shape and refractive index." J. Geophys. Res. Atmos. 119 (2): 753-786 [10.1002/2013JD020046]

    Randles, C. A., P. R. Colarco, and A. M. Da Silva. 2013. "Direct and semi-direct aerosol effects in the NASA GEOS-5 AGCM: aerosol-climate interactions due to prognostic versus prescribed aerosols." J. Geophys. Res. Atmos. 118 (1): 149–169 [10.1029/2012JD018388]

    Randles, C. A., S. Kinne, G. Myhre, et al. M. Schulz, J. Fischer, L. Doppler, E. Highwood, C. Ryder, B. Harris, J. Huttunen, Y. Ma, R. T. Pinker, B. Mayer, D. Neubauer, R. Hitzenberger, L. Oreopoulos, D. Lee, G. Pitari, G. DiGenova, J. Quaas, F. G. Rose, S. Kato, S. T. Rumbold, I. Vardavas, N. Hatzianastassiou, C. Matsoukas, H. Yu, F. Zhang, H. Zhang, and P. Lu. 2013. "Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment." Atmos. Chem. Phys. 13 (5): 2347-2379 [10.5194/acp-13-2347-2013]

    Stier, P., N. Schutgens, N. Bellouin, et al. H. Bian, O. Boucher, M. Chin, S. Ghan, N. Huneeus, S. A. Kinne, G. Lin, X. Ma, G. Myhre, J. Penner, C. A. Randles, B. Samset, M. Schulz, T. Takemura, F. Yu, H. Yu, and C. Zhou. 2013. "Host model uncertainties in aerosol radiative forcing estimates: results from the AeroCom Prescribed intercomparison study." Atmos. Chem. Phys. 13 (6): 3245-3270 [10.5194/acp-13-3245-2013]

    Randles, C. A., and V. Ramaswamy. 2010. "Direct and semi-direct impacts of absorbing biomass burning aerosol on the climate of southern Africa: a Geophysical Fluid Dynamics Laboratory GCM sensitivity study." Atmos. Chem. Phys. 10 (20): 9819-9831 [10.5194/acp-10-9819-2010]

    Ott, L., B. N. Duncan, S. Pawson, et al. P. Colarco, M. Chin, C. A. Randles, T. Diehl, and E. Nielsen. 2010. "Influence of the 2006 Indonesian biomass burning aerosols on tropical dynamics studied with the GEOS-5 AGCM." J Geophys Res 115 (D14): D14121 [10.1029/2009JD013181]

    Randles, C. A., and V. Ramaswamy. 2008. "Absorbing aerosols over Asia: A Geophysical Fluid Dynamics Laboratory general circulation model sensitivity study of model response to aerosol optical depth and aerosol absorption." J. Geophys. Res. 113 (D21): D21203 [10.1029/2008JD010140]

    Randles, C. A., V. Ramaswamy, and L. M. Russell. 2004. "Hygroscopic and optical properties of organic sea salt aerosol and consequences for climate forcing." Geophysical Research Letters 31 (16): L16108 [10.1029/2004GL020628]

                                                                                                                                                                                            
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