Profile for Lazaros Oreopoulos


Click image to view larger version.
Title: Chief, Climate & Radiation Laboratory
Affiliation: NASA Civil Service
Contact: E-mail
NASA/GSFC
Code 613
Greenbelt, MD 20771

Office Phone: 301-614-6128
Fax: 301-614-6307

Brief Bio

Dr. Lazaros Oreopoulos (a.k.a Lazaros Oraiopoulos) is the Chief of the Climate and Radiation Lab. He has been at GSFC since 1997, initially with JCET/UMBC (1997-2008) and then as a civil servant (2008-present). He conducts research on the modeling and remote sensing of clouds, cloud-aerosol interactions, and many aspects of atmospheric radiative transfer for climatic applications. He is the Deputy Project Scientist for the Aqua satellite mission, and a member of the CloudSat Science Team, the GEWEX GASS Science Steering Committee, and the International Radiation Commission. He has also served as a member of the Landsat Science Team, the AMS Atmospheric Radiation Committee, and the GEWEX Radiation Panel.

Dr. Oreopoulos holds a B. Sc. in Physics from Aristotle's University of Thessaloniki, Greece, and M. Sc. and Ph. D. degrees in Atmospheric Sciences from McGill University, Montreal. For more details please download his CV. Web of Science publications and citation metrics can be found here; see also Google Scholar.

Publications

Huang, X., X. Chen, G. L. Potter, L. Oreopoulos, J.N.S. Cole, D. Lee, and N.G. Loeb (2014). A global climatology of outgoing longwave spectral cloud radiative effect and associated effective cloud properties J. Climate, (Submitted).

Huang, X., Cole, J.N.S., F. He, G.L. Potter, L. Oreopoulos, D. Lee, N.G. Loeb, and M. Suarez (2013). Longwave band-by-band cloud radiative effect and its application in GCM evaluation J. Climate, 26, 450-467
doi:10.1175/JCLI-D-12-00112.1

Lee, D., L. Oreopoulos, G.J. Huffman, W.B. Rossow, and I.-S. Kang (2013). The precipitation characteristics of ISCCP tropical weather states J. Climate, 26, 772-788
doi: http://dx.doi.org/10.1175/JCLI-D-11-00718.1

Lee, D., Y.C. Sud, L. Oreopoulos, K.M. Kim, W. K. Lau, and I.-S. Kang (2013). Modeling the influences of aerosols on pre-monsoon circulation and rainfall over Southeast Asia Atmos. Chem. Phys. Disc, 13, 32885-32923
doi:10.5194/acpd-13-32885-2013

Lee, D., L. Oreopoulos, G. J. Huffman, W. B. Rossow, and I.-S. Kang (2013). The Precipitation Characteristics of ISCCP Tropical Weather States Journal of Climate, 26(3), 772-788
10.1175/JCLI-D-11-00718.1

Meyer, K., S. Platnick, L. Oreopoulos, and D. Lee (2013). Estimating the direct radiative effect of absorbing aerosols overlying marine boundary layer clouds in the southeast Atlantic using MODIS and CALIOP J. Geophy., Res.
doi:10.1002/jgrd.50449

Randles, C., S. Kinne, G. Myhre, M. Schulz, Pl Stier, 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, 2347-2379
doi:10.5194/acp-13-2347-2013

Randles, C. A., S. Kinne, G. Myhre, M. Schulz, P. Stier, J. Fischer, L. Doppler, E. Highwood, C. Ryder, B. Harris, J. Huttunen, Y. Ma, R. T. Pinker, B. Mayer, J. Neubauer, R. Hitzenberger, L. Oreopoulos, D. Lee, G. Pitari, G. Di Genova, 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 Atmospheric Chemistry and Physics, 13, 2347-2379
10.5194/acp-13-2347-2013

Sud, Y., D. Lee, L. Oreopoulos, D. Barahona, A. Nenes, and M.J. Suarez (2013). Performance of McRAS-AC in the GEOS-5 AGCM: aerosol-cloud-microphysics, precipitation, cloud radiative effects, and circulation Geosci. Model Dev, 6, 57-79
doi:10.5194/gmd-6-57-2013

Wen, G., R.F. Cahalan, J.D. Haigh, P. Pilewskie, L. Oreopoulos, and J.W. Harder (2013). Reconciliation of Modeled Climate Responses to Spectral Solar Forcing J. Geophy., Res.,-Atmos., 118, 1-9
doi:10.1002/jgrd.50506

Wilson, M., and L. Oreopoulos (2013). Enhancing a Simple MODIS Cloud Mask Algorithm for the Landsat Data Continuity Mission IEEE TGRS, 51(2), 723-730
doi:10.1109/TGRS.2012.2203823

Yi, B., P. Yang, B.A. Baum, T. L'Ecuyer, L. Oreopoulos, E.J. Mlawer, A.J. Heymsfield, and K.N. Liou (2013). Effects of ice particle surface roughness on ice cloud radiative forcing simulations J. Atmos. Sci, 70, 2794-2807
doi: http://dx.doi.org/10.1175/JAS-D-13-020.1

Yuan, T., and L. Oreopoulos (2013). On the global character of the overlap between high and low clouds Geophys. Res. Lett, 40, 5320-5326
doi:10.1002/grl.50871

Zhang, Z., K. Meyer, S.E. Platnick, L. Oreopoulos, D. Lee, and H. Yu (2013). A novel method for estimating shortwave direct radiative effect of above-cloud aerosols using CALIOP and MODIS data Atmos. Meas. Tech, 6, 9993-10020
doi:10.5194/amtd-6-9993-2013

Morales Betancourt, R., D. Lee, L. Oreopoulos, Y. C. Sud, D. Barahona, and A. Nenes (2012). Sensitivity of cirrus and mixed-phase clouds to the ice nuclei spectra in McRAS-AC: single column model simulations Atmos. Chem. Phys, 12, 10679-10692
doi:10.5194/acp-12-10679-2012

Oreopoulos, L., E. Mlawer, J. Delamere, T. Shippert, J. Cole, B. Fomin, M. Iacono, Z. Jin, J. Li, J. Manners, P. Raisanen, F. Rose, Y. Zhang, M. Wilson, and W. Rossow (2012). The Continual Intercomparison of Radiation Codes: Results from Phase I J. Geophy., Res, 117, D06118.
doi:10.1029/2011JD016821

Oreopoulos, L., D. Lee, Y.C. Sud, and M.J. Suarez (2012). Radiative impacts of cloud heterogeneity and overlap in an atmospheric General Circulation Model Atmos. Chem. Phys, 12, 9097-9111
doi:10.5194/acp-12-9097-2012

Yuan, T., L. A. Remer, H. Bian, J.R. Ziemke, R. Albrecht, K.E. Pickering, L. Oreopoulos, S.J. Goodman, H. Yu, and D. J. Allen (2012). Aerosol indirect effect on tropospheric ozone via lightning J. Geophys. Res-Atmos, 117, D18213.
doi:10.1029/2012JD017723

Oreopoulos L., and P. M. Norris (2011). An analysis of cloud overlap at a midlatitude atmospheric observation facility Atmos. Chem. Phys., 11, 5557-5567
doi:10.5194/acp-11-5557-2011

Oreopoulos L., and W. B. Rossow (2011). The cloud radiative effects of International Satellite Cloud Climatology Project weather states J. Geophys. Res., 116, D12202.
doi:10.1029/2010JD015472

Oreopoulos, L., and E. Mlawer (2010). The Continual Intercomparison of Radiation Codes (CIRC): Assessing anew the quality of GCM radiation algorithms Bull. Am. Met. Soc., 91, 305-310
doi:10.1175/2009BAMS2732.1

Oreopoulos L., M.J. Wilson, and T. Varnai (2010). Implementation on Landsat Data of a Simple Cloud Mask Algorithm Developed for MODIS Land Bands IEEE Geosc. & Rem. Sens. Lett., 99, 597-601
doi:10.1109/LGRS.2010.2095409

Joiner J., M. R. Schoeberl, A. P. Vasilkov, L. Oreopoulos, S. Platnick, N. J. Livesey, and P. F. Levelt (2009). Accurate satellite-derived estimates of the tropospheric ozone impact on the global radiation budget Atmos. Chem. Phys., 9(13), 4447-4465
doi:10.5194/acp-9-4447-2009

Oreopoulos L., S. Platnick, G. Hong, P. Yang, and R.F. Cahalan (2009). The shortwave radiative forcing bias of liquid and ice clouds from MODIS observations Atmos. Chem. Phys, 9(16), 5865-5875
doi:10.5194/acp-9-5865-2009

Oreopoulos L., E. Mlawer, J. Delamere, and T. Shippert (2009). The Continual Intercomparison of Radiation Codes (CIRC): A New Standard for Evaluating GCM Radiation Codes [PowerPoint slides]. Retrieved from Current Problems in Atmospheric Radiation (IRS 2008 Proceedings)

Oreopoulos L., S.E. Platnick, G. Hong, P. Yang, and R.F. Cahalan (2009). The Shortwave Radiative Forcing Bias of Homogeneous Liquid and Ice Clouds Observed by MODIS [PowerPoint slides]. Retrieved from Current Problems in Atmospheric Radiation (IRS 2008 Proceedings)

Oreopoulos L., and E. Mlawer (2009). CIRC to Provide Key Intercomparisons of GCM Radiative Transfer Codes Prior to Next IPCC Assessment GEWEX Feb 09 Newsletter, p.8

Vasilkov A. P., J. Joiner, L. Oreopoulos, J.F. Gleason, P. Veefkind, E. Bucsela, E.A. Celarier, R. J. D. Spurr, and S. Platnick (2009). Impact of tropospheric nitrogen dioxide on the regional radiation budget Atmos. Chem. Phys. 9, 6389-6400.

Vasilkov A.P., J. Joiner, L. Oreopoulos, J.F. Gleason, P. Veefkind, E. Bucsela, E.A. Celarier, R.J.D. Spurr, and S.E. Platnick (2009). Impact of tropospheric nitrogen dioxide on the regional radiation budget. Atmos. Chem. Phys., 9, 6389-6400

Koren I., L. Oreopoulos, G. Feingold, L.A. Remer, and O. Altaratz (2008). How small is a small cloud? Atmos. Chem. Phys., 8(2), 6379-6407
doi:10.5194/acpd-8-6379-2008

Norris P. M., L. Oreopoulos, A.Y. Hou, W.K. Tao, and X. Zeng (2008). Representation of 3D heterogeneous cloud fields using copulas: Theory for water clouds Q. J. R. Meteorol. Soc., 1843-1864
doi:13410.1002/qj.321

Oreopoulos L., and S. Platnick (2008). The radiative susceptibility of cloudy atmospheres to droplet number perturbations: 2. Global analysis from MODIS J. Geophys. Res., 113(D14S21).
doi:10.1029/2007JD009655

Platnick S., and L. Oreopoulos (2008). The radiative susceptibility of cloudy atmospheres to droplet number perturbations: 1. Theoretical analysis and examples from MODIS J. Geophys. Res., 113(D14S20).
doi:10.1029/2007JD009654

Oreopoulos L., R. Cahalan, and S. Platnick (2007). The plane-parallel albedo bias of liquid clouds from MODIS observations J. Climate, 20, 5114-5125

Oreopoulos L., A. Marshak, R.F. Cahalan, T. Varnai, A. B. Davis, and A. Macke (2006). New Directions in the Radiative Transfer of Cloudy Atmospheres EOS, No. 5, 31 January 2006

Cahalan R.F., L. Oreopoulos, A. Marshak, K. F. Evans, A. Davis, R. Pincus, K. Yetzer, B. Mayer, R. Davies, T. Ackerman, H. Barker, E. Clothiaux, R. Ellingson, M. Garay, E. Kassianov, S. Kinne, A. Macke, OHirok W., P. Partain, S. Prigarin, A. Rublev, G. Stephens, F. Szczap, E. Takara, T. Varnai, G. Wen, and T. Zhuravleva (2005). The International Intercomparison of 3D Radiation Codes (I3RC): Bringing together the most advanced radiative transfer tools for cloudy atmospheres Bull. Amer. Meteor. Soc. (9), 86, 1275-1293

Oreopoulos L., and R.F. Cahalan (2005). Cloud inhomogeneity from MODIS J. Climate, No. 23, 18, 5110
10.1175/JCLI3591.1

Oreopoulos L. (2005). The impact of subsampling on MODIS Level-3 statistics of optical thickness and effective radius IEEE Trans. Geosc. Rem. Sens., 43(2), 366-373.

Oreopoulos L., M. -D. Chou, M. Khairoutdinov, H. W. Barker, and R.F. Cahalan (2004). Performance of Goddard Earth Observing System GCM column radiation models under heterogeneous cloud conditions Atmospheric Research, 72, 365-382

Oreopoulos L., A. Marshak, and R.F. Cahalan (2003). Consistency of ARESE II cloud absorption estimates and sampling issues J. Geophys. Res. (D1), 4029, 108.
10.1029/2002JD002243

Oreopoulos L., and M. Khairoutdinov (2003). Overlap properties of clouds generated by a cloud-resolving model J. Geophys. Res. (D15), 4479, 108.
10.1029/2002JD003329

Cahalan R.F., L. Oreopoulos, G. Wen, A. Marshak, S.C. Tsay, and T. P. DeFelice (2001). Cloud characterization and clear sky correction from Landsat 7 Remote Sens. Environ., 78, 83-98

Wen G., R.F. Cahalan, T. -S. Tsay, and L. Oreopoulos (2001). Impact of cumulus cloud spacing on Landsat atmospheric correction and aerosol retrieval J. Geophys. Res. - Atmos., 106, 12129-12138

Oreopoulos L., A. Marshak, R. Cahalan, and G. Wen (2000). Cloud three-dimensional effects evidenced in Landsat spatial power spectra and autocorrelation function J. Geophys. Res., 105, 14777-14788

Oreopoulos L., R. Cahalan, A. Marshak, and G. Wen (2000). A new normalized difference cloud retrieval technique applied to Landsat radiances over the Oklahoma ARM Site J. Appl. Meteor., 39, 2305-2320

Marshak A., L. Oreopoulos, A. Davis, W. Wiscombe, and R. Cahalan (1999). Horizontal radiative fluxes in clouds and accuracy of the Independent Pixel Approximation at absorbing wavelengths Geophys. Res. Lett., 11, 1585-1588

Marshak A., W. Wiscombe, A. Davis, L. Oreopoulos, and R. Cahalan (1999). On the removal of the effect of horizontal fluxes in two-aircraft measurements of cloud absorption Quart. J. Roy. Meteor. Soc., 125, 2153-2170

Oreopoulos L., and H. W. Barker (1999). Accounting or subgrid-scale cloud variability in a multi-layer 1D solar radiative transfer algorithm Q.J.R. Meteorol. Soc., 125, 301-330

Wen G., S.C. Tsay, R. Cahalan, and L. Oreopoulos (1999). Path radiance technique for retrieving aerosol optical thickness over land J. Geophys. Res. - Atmos., 104, 31321-31332

Oreopoulos L., and R. Davies (1998). Plane Parallel Albedo Biases from Satellite Observations. Part II: Parameterizations for Bias Removal J. Climate, 11, 933-944

Oreopoulos L., and R. Davies (1998). Plane Parallel Albedo Biases from Satellite Observations. Part I: Dependence on Resolution and Other Factors J. Climate, 11, 919-932

Oreopoulos L., and R. Davies (1993). Statistical Dependence of Albedo and Cloud Cover on Sea Surface Temperature for Two Tropical Marine Stratocumulus Regions J. Climate, 6, 2434-2447