Profile for Robert Cahalan

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Title: Project Scientist, SORCE & TCTE, Free-Flyer/TSIS
Affiliation: NASA Civil Service
Contact: E-mail
Greenbelt, MD 20771

Office Phone: 301-614-5390
Fax: 301-614-6307

Dr. Robert F. Cahalan obtained a Ph.D. in Physics from the University of Illinois-Urbana in 1973. His research interests include chaos and fractals, cloud structure, Landsat and other high-resolution satellites, multiple field-of-view lidar, and solar forcing of earth climate.

Honors and Awards

2009   Elected Fellow of the American Meteorological Society (AMS)
2008   Elected President of the International Radiation Commission (IRC)
2006   Outstanding Leadership and Service, Climate Change Science Program
2006   NASA Exceptional Service Medal
2006   AIAA Space Systems Award - Earth Observing System Team
2004   NASA Achievement Award, SORCE Mission Team
2004   Goddard Achievement Award, Climate Change Science Program
2003   International Radiation Commission, elected member
2002   Excellence in Tech Communication, Laser Focus World
1998   NASA/Goddard Scientific Achievement Award
1996   NASA/Goddard Exceptional Achievement Award


Updates to our publications records have been put on hold until a new storage and delivery system has been put in place. As a result, this information is currently out of date and does not include the most recent publications. For a more complete listing of publications, please visit the Sciences and Exporation Directorate.

Cahalan, R.F. (2013). Radiation Processes in the Atmosphere and Ocean (IRS2012): Proceedings of the International Radiation Symposium (IRC/IAMAS) AIP Conference Proceedings
ISBN 978-0-7354-1155-5

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

Wen, G., A. Marshak, R.C. Levy, L.A. Remer, N. G. Loeb, T. Varnai, and R.F. Cahalan (2013). Improvement of MODIS Aerosol Retrievals Near Clouds J. Geophy., Res.,-Atmos, 118, 9168-9181

Wen, G., A. Marshak, R. Levy, L. Remer, N. Loeb, T. Varnai, and R.F. Cahalan (2013). Implementation of the correction algorithm of the MODIS aerosol retrievals near clouds J. Geophy., Res, 118.

Pounder, N.L., R.J. Hogan, T. Varnai, A. Battaglia, and R.F. Cahalan (2012). A variational method to retrieve the extinction profile in liquid clouds using multiple field-of-view lidar. J. Appl. Meteor. Climatol, 51, 350-365

Sun, M., J. Li, C. Yang, G.A. Schmidt, M.J. Bambacus, R.F. Cahalan, Q. Huang, E.U. Noble, and Z. Li (2012). A Web-Based Geovisual Analytical System for Climate Studies Future Internet, 4, 1069-1085

Cahalan R.F., G. Wen, P. Pilewskie, and J. Harder (2010). Temperature Responses To Spectral Solar Variability On Decadal Timescales Geophys. Res. Lett., 37, L07705.

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

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)

Marshak A., G. Wen, J. Coakley, L. Remer, N. G. Loeb, and R.F. Cahalan (2008). A simple model for the cloud adjacency effect and the apparent bluing of aerosols near clouds J. Geophys. Res., 113(D14S17).

Miyahara H., G. Wen, R.F. Cahalan, and A. Ohmura (2008). Deriving Historical Total Solar Irradiance from Lunar Borehole Temperatures Geophys. Res. Lett., 35, L02716.

Sud Y.C., G.K. Walker, Y.P. Zhou, G. A. Schmidt, W.K.-M. Lau, and R.F. Cahalan (2008). Effects of doubled CO2 on tropical Sea-Surface Temperatures (SSTs) for onset of deep convection and maximum SST: Simulations based inferences Geophy. Res. Lett., 35( L12707).

Wen G., A. Marshak, and R.F. Cahalan (2008). Importance of Molecular Rayleigh Scattering in the Enhancement of Clear Sky Radiance in the Vicinity of Boundary Layer Cumulus Clouds J. Geophys. Res., 113(D24207).

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

Varnai T., and R.F. Cahalan (2007). Potential for airborne offbeam lidar measurements of snow and sea ice thickness J. Geophys. Res., 112, C12S90.

Wen G., A. Marshak, R.F. Cahalan, L.A. Remer, and R.G. Kleidman (2007). 3D aerosol-cloud radiative interaction observed in collocated MODIS and ASTER images of cumulus cloud fields J. Geophys. Res., 112, D13204.

Marshak A., S. Platnick, T. Varnai, G. Wen, and R.F. Cahalan (2006). Impact of 3D radiative effects on satellite retrievals of cloud droplet sizes J. Geophys. Res., DO9207, 111.

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

Wen G., A. Marshak, and R.F. Cahalan (2006). Impact of 3D Clouds on Clear Sky Reflectance and Aerosol Retrieval in a Biomass Burning Region of Brazil IEEE Geo. Rem. Sens. Lett., 3, 169-172

Anderson D. E., and R.F. Cahalan (2005). The Solar Radiation and Climate Experiment (SORCE) Mission for the NASA Earth Observing System (EOS) Solar Phys., Issue 1, 203, 3-6

Cahalan, R.F., M. McGill, J. Kolasinski, T. Varnai, and K. Yetzer (2005). THOR- Thickness from Offbeam Returns lidar J. Atmos. Ocean. Technol., 22, 605-627

Cahalan R.F., M. McGill, J. Kolasinski, T. Varnai, and K. Yetzer (2005). THOR — Cloud Thickness from Offbeam Lidar Returns J. Atmos. Ocean. Tech., 22(6), 605-627

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

Cahalan R.F. (2005). Effective Cloud Properties for Large-Scale Models. Three-dimensional Radiative Transfer in Cloudy Atmospheres, ed. A. Marshak and A. Davis, Springer, 2005, 686 pages.

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

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.

Wen G., R.F. Cahalan, and B. N. Holben (2003). Limitations of ground-based solar irradiance estimates due to atmospheric variations J. Geophys. Res. (D14), 4400, 108.

Davis A., S. Love, R.F. Cahalan, and M. McGill (2002). Off-beam lidar senses cloud thickness and density Laser Focus World, 38, 101-104

Davis A. B., S. P. Love, R.F. Cahalan, and M.J. McGill (2002). Off-beam Lidar senses cloud thickness and density Laser Focus World, October Issue, 38, 101-103

Rozwadowska A., and R.F. Cahalan (2002). Plane-parallel biases computed from inhomogeneous clouds and sea ice J. Geophys. Res. (Atmos.), 107, 4384-4401

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

Davis A., A. Marshak, and R. Cahalan (2001). Green functions for multiple scattering as mathematical tools for dense cloud remote sensing: theory, with passive and active applications. (294-306). Laser Radar Technology and Applications VI, ed. Gary W. Kamerman.

DeFelice T. P., and R.F. Cahalan (2001). Comment and Reply on "Landsat 7 reveals more than just surface features in remote areas of the globe" Bull. Amer. Meteor. Soc.,., 82, 313-314

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

DeFelice T. P., J. D. Meyer, G. Xian, J. Christopherson, and R.F. Cahalan (2000). Landsat 7 reveals more than just surface features in remote areas of the globe Bull. Amer. Meteor. Soc., 81, 1047-1049

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

Davis A., R. Cahalan, J. Spinhirne, M. McGill, and S. Love (1999). Offbeam Lidar: An emerging technique in cloud remote sensing based on radiative Green function theory in the diffusion domain Phys. Chem. EarthB24, 177-185

Davis A.B., R.F. Cahalan, J.D. Spinhirne, M. McGill, and S.P. Love (1999). Off-beam lidar: An emerging technique in cloud remote sensing based on radiative Green-function theory in the diffusion domain Phys. Chem. Earth - B, 24, 177-185

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

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

Davis A., A. Marshak, R. Cahalan, and W. Wiscombe (1998). Insight into three-dimensional radiation transport from diffusion theory, application to the cloudy atmosphere. (111-139). Radiative Transfer, Ed. M. P. Mengue, Begell House, Inc., NY.

Marshak A., A. Davis, R. Cahalan, and W. Wiscombe (1998). Nonlocal Independent Pixel Approximation, direct and inverse problems IEEE Trans. Geosci. Remote Sens., 36, 192-205

Marshak A., A. Davis, W. Wiscombe, and R. Cahalan (1998). Radiative effects of sub-mean-free-path liquid water variability observed in stratiform clouds J. Geophys. Res. (Atmos.), 103, 19557-19567

Marshak A., A. Davis, W. Wiscombe, W. Ridgway, and R. Cahalan (1998). Biases in shortwave column absorption in the presence of fractal clouds J. Climate, 11, 431-446

Cahalan R.F., A. Davis, A. Marshak, D. Silberstein, and W. Wiscombe (1997). Cloud macrostructure and radiation Remote Sensing A Scientific Vision for Sustainable Development: LC 97-70575, ISBN 0-7803-3839-1 F01, 41-44

Davis A., A. Marshak, R.F. Cahalan, and W. Wiscombe (1997). Interactions, solar and Laser beams in stratus clouds, fractals and multifractals in climate and remote sensing studies Fractals, 5, 129-166

Davis A., A. Marshak, W. Wiscombe, and R.F. Cahalan (1997). Evidence for net horizontal radiative fluxes in marine stratocumulus.. (809-812). IRS'96 Current Problems in Atmospheric Radiation, W. L. Smith and K. Stamnes, Eds., Deepak Publ..

Davis A., D. Winker, A. Marshak, J. Spinhurne, R. Cahalan, S. Love, S. Melfi, and W. Wiscombe (1997). Retrieval of physical and optical cloud thicknesses from space-borne and wide-angle Lidar Adv. Atmos. Remote Sensing with Lidar, A. Ansmann, R. Neuber, P. Rairoux and U. Wadinger, Eds. Springer-Verlag, 193-196

Davis A., A. Marshak, R.F. Cahalan, and W. Wiscombe (1997). The Landsat scale break in stratocumulus as a three-dimensional radiative transfer effect: Implications for cloud remote sensing J. Atmos. Sci., 54, 241-260

Marshak A., A. Davis, R. Cahalan, and W. Wiscombe (1997). Physical simulation of high-resolution satellite images for fractal cloud model. (301-310). Fractal Frontiers. M. M. Novak and T. G. Dewey, Eds., World Scientific.

Marshak A., A. Davis, R. Cahalan, and W. Wiscombe (1997). The effect of horizontal fluxes on cloud absorption estimates based on simulated two-aircraft measurements of fractal clouds. IRS'96: Current problems in atmospheric radiation. (415-418). W. L. Smith and K. Stamnes, Eds., Deepak Publ..

Marshak A., A. Davis, R.F. Cahalan, and W. Wiscombe (1997). Nonlocal Independent Pixel Approximation for computing radiation fields of inhomogeneous clouds. IRS'96: Current problems in atmospheric radiation. (139-142). W. L. Smith and K. Stamnes, Eds., Deepak Publ..

Marshak A., A. Davis, W. Wiscombe, and R. Cahalan (1997). Inhomogeneity effects on cloud shortwave absorption measurements: Two-aircraft simulations J. Geophys. Res., 102, 16619-16637

Marshak A., A. Davis, W. Wiscombe, and R.F. Cahalan (1997). Scale-invariance of liquid water distributions in marine stratocumulus. II. Multifractal properties and intermittency issues J. Atmos. Sci., 54, 1423-1444

Cahalan R.F., and L. Green (1996). Review of Introduction to Circulating Atmospheres by I. James Amer. Sci., 84, 602-603

Cahalan R.F., L. Wharton, and M. -L. Wu (1996). Empirical Orthogonal Functions of monthly temperature and precipitation over the United States and homogeneous stochastic models J. Geophys. Res., 101, 26309-26318

Davis A., A. Marshak, W. Wiscombe, and R.F. Cahalan (1996). Multifractal characterizations of intermittency in nonstionary geophysical signals and fields. (97-158). Nonstationary Random Processes and Their Applications, G. Trevino, Ed., World Scientific.

Davis A., A. Marshak, W. Wiscombe, and R.F. Cahalan (1996). Scale-invariance of liquid water distributions in marine stratocumulus. I. Spectral properties and stationarity issues J. Atmos. Sci., 53, 1538-1558

Cahalan R.F., D. Silberstein, and J. B. Snider (1995). Liquid water path and plane-parallel albedo bias during ASTEX J. Atmos. Sci., 52, 3002-3012

Gollmer S., Harshvardhan, R.F. Cahalan, and J. B. Snider (1995). Windowed and wavelet analysis of marine stratocumulus cloud inhomogeneity J. Atmos. Sci., 52, 3013-3030

Marshak A., A. Davis, W. Wiscombe, and R.F. Cahalan (1995). Radiative smoothing in fractal clouds J. Geophys. Res. (Atmos.), 100, 26247-26261

Cahalan R.F. (1994). Bounded cascade clouds albedo and effective thickness Nonlinear Proc. Geophys., 1, 156-167

Cahalan R.F., W. Ridgway, W.J. Wiscombe, Harshvardhan, and S. Gollmer (1994). Independent pixel and Monte Carlo estimates of stratocumulus albedo J. Atmos. Sci., 51, 3776-3790

Cahalan R.F., W. Ridgway, W.J. Wiscombe, T.L. Bell, and J. B. Snider (1994). The albedo of fractal stratocumulus clouds J. Atmos. Sci., 51, 2434-2455

Davis A., A. Marshak, W.J. Wiscombe, and R.F. Cahalan (1994). Multifractal characterizations of non-stationarity and intermittency in geophysical fields: Observed, retrieved, or simulated J. Geophys. Res., 99, 8055-8072

Marshak A., A. Davis, R.F. Cahalan, and W.J. Wiscombe (1994). Bounded Cascade Models as non-stationary multifractals Phys. Rev.E49, 55-69

Cahalan R.F., and W.J. Wiscombe (1993). Impact of cloud structure on climate. (120-124). Current Problems in Atmospheric Radiation. A. Deepak Publishing.

Marshak A., A. Davis, R. Cahalan, and W. Wiscombe (1993). Multi-singular and multi-affine properties of Bounded Cascade Models Fractals, 3, 702-710

Cahalan R.F. (1992). Kuwait oil fires as seen by Landsat J. Geophys. Res., 97, 14565-14571

Cahalan R.F. (1991). Landsat observations of fractal cloud structure. (281-295). Nonlinear Variability in Geophysics, D. Schertzer and S. Lovejoy, Eds, Kluwer, Inc..

Cahalan R.F., H. Leidecker, and G. Cahalan (1990). Chaotic rhythms of a dripping faucet Computers In Physics, 4, 368-383

Cioffi D., R. Cahalan, and D. Leisawitz (1990). Turbulence in an IRAS Cirrus Cloud Bulletin of the American Astronomical Society, p.1246, 22.

Joseph J. H., and R.F. Cahalan (1990). Nearest-neighbor spacing in fair weather cumulus J. Appl. Meteor., 29, 793-805

Cahalan R.F. (1989). Overview of fractal clouds. (371-388). Advances in Remote Sensing, A. Deepak Publ..

Cahalan R.F., and J. B. Snider (1989). Marine stratocumulus structure Remote Sens. Environ., 28, 95-107

Cahalan R.F., and J. H. Joseph (1989). Fractal statistics of cloud fields Mon. Wea. Rev., 117, 261-272

Cahalan R.F., M. Nestler, W. Ridgway, W.J. Wiscombe, and T. Bell (1989). Marine stratocumulus spatial structure. (19-25). Proc. Fourth Int. Conf. Stat. Clim., IMSC.

Cahalan R.F., and L. S. Chiu (1986). Large-scale short-period sea ice-atmosphere interaction J. Geophys. Res., 91, 10709-10717

Cahalan R.F. (1986). Nearest neighbor spacing distributions of cumulus clouds. (212-217). Proc. Int. Conf. Stat. Clim..

Short D. A., and R.F. Cahalan (1983). Interannual variability and climatic noise in satellite-observed Outgoing Longwave Radiation Mon. Wea. Rev., 111, 572-577

Cahalan R.F., D. A. Short, and G. R. North (1982). Cloud fluctuation statistics Mon. Wea. Rev., 110, 26-43

North G. R., F. J. Moeng, T.L. Bell, and R.F. Cahalan (1982). The latitude dependence of the variance of zonally averaged quantities Mon. Wea. Rev., 110, 319-326

North G. R., T.L. Bell, R.F. Cahalan, and F. J. Moeng (1982). Sampling errors in the estimation of Empirical Orthogonal Functions Mon. Wea. Rev., 110, 699-706

North G. R., and R.F. Cahalan (1981). Predictability in a solvable stochastic climate model J. Atmos. Sci., 38, 504-510

North G. R., R.F. Cahalan, and J. A. Coakley (1981). Energy-balance climate models Rev. Geophys. Space Phys., 19, 91-121

Salmun H., R.F. Cahalan, and G. R. North (1980). Latitude-dependent sensitivity to stationary perturbations in simple climate models J. Atmos. Sci., 37, 1874-1879

Cahalan R.F., and G. R. North (1979). A stability theorem for energy-balance climate models J. Atmos. Sci., 36, 1178-1188

Balachandran A. P., R.F. Cahalan, and et al. (1978). Rotationally invariant approximation to charge-monopole scattering Phys. Rev.D17, 1136-1149

Balachandran A. P., R.F. Cahalan, and et al. (1978). Analyticity of the charge-monopole scattering amplitude Phys. Rev.D17, 1150-1154

Cahalan R.F., and D. Knight (1976). Construction of planar diagrams Phys. Rev.D14, 2126-2136

Cahalan R.F., K. A. Geer, J. Kogut, and L. Susskind (1975). Asymptotic freedom and the 'absence' of vector gluon exchange in wide-angle hadronic collisions Phys. Rev.D11, 1199-1212

Cahalan R.F. (1974). Zo photoproduction at high energy Phys. Rev.D9, 257-272

Cahalan R.F., and K. O. Mikaelian (1974). Zo effect in lepton-pair photoproduction Phys. Rev.D10, 3769-3779

Cahalan R.F., and P. H. Frampton (1974). Spontaneous symmetry breakdown and Regge intercepts Phys. LettersB, 50, 475-478

Cahalan R.F. (1972). Cluster expansion in a renormalizable theory: The elastic form factor Phys. Rev.D5, 2999-3021