Sciences and Exploration Directorate

Larry D. Travis


Larry D. Travis's Contact Card & Information.
Phone: 212.678.5599
Org Code: 611
Mail Code 611
New York, NY 10025
Employer: EMERITUS

Brief Bio

Larry Travis is currently Associate Chief of the Goddard Institute for Space Studies (GISS) in the Earth Sciences Division of the Science and Exploration Directorate.  Having joined GISS as a civil servant in 1978, his research has emphasized remote sensing of clouds and aerosols in planetary atmospheres and analysis and interpretation of such observations.  He served as Principal Investigator for the Cloud Photopolarimeter Instrument on the Pioneer Venus Orbiter Mission and as Co-Investigator for the Photopolarimeter/Radiometer Instrument on the Galileo Orbiter Mission.  He received B.A. and M.S. degrees in Astronomy at the University of Iowa and Ph.D. in Astronomy at The Pennsylvania State University.


Associate Chief, Goddard Institute for Space Studies

NASA Goddard Space Flight Center - New York, NY 10025

1987 - Present

Physical Scientist, Goddard Institute for Space Studies

NASA Goddard Space Flight Center - New York, NY 10025

1978 - 1987

Member Technical Staff, Sigma Data Services at GISS

Sigma Data Services - New York, NY 10025

1977 - 1978

Member Technical Staff, GTE Information Services at GISS

GTE Information Services - New York, NY 10025

1974 - 1977

Member Technical Staff, Computer Sciences Corp. at GISS

Computer Sciences Corp. - New York, NY 10025

1973 - 1974

Assistant Professor of Physics

The Pennsylvania State University, Worthington Scranton - Dunsmore, PA

1971 - 1973

Teaching Experience

Assistant Professor, Department of Physics, The Pennsylvania State University, Worthington Scranton Campus, Dunsmore, PA    September 1971 - June 1973 


B.A. with distinction (Astronomy and Mathematics), University of Iowa, 1965; M.S. in Astronomy, University of Iowa, 1967; Ph.D. in Astronomy, The Pennsylvania State University, 1971

Professional Societies

American Astronomical Society

1967 - Present

American Geophysical Union

1968 - Present

American Association for the Advancement of Science

1973 - Present


NASA Exceptional Scientific Achievement Medal, 1980



2012. "Aerosol retrievals from channel-1 and -2 AVHRR radiances: Long-term trends updated and revisited." J Quant Spectrosc Radiat Transfer 113 (15): 1974-1980 [10.1016/j.jqsrt.2012.05.006] [Journal Article/Letter]

2012. "Sensitivity of multiangle, multispectral polarimetric remote sensing over open oceans to water-leaving radiance: Analyses of RSP data acquired during the MILAGRO campaign." Remote Sens Environ 118 284-308 [10.1016/j.rse.2011.11.003] [Journal Article/Letter]

2011. "Electromagnetic scattering by a morphologically complex object: Fundamental concepts and common misconceptions." J. Quant. Spectrosc. Radiat. Transfer 112 (4): 671-692 [10.1016/j.jqsrt.2010.03.016] [Journal Article/Letter]

2010. "T-matrix method and its applications to electromagnetic scattering by particles: A current perspective." J Quant Spectrosc Radiat Transfer 111 (11): 1700-1703 [10.1016/j.jqsrt.2010.01.030] [Journal Article/Letter]

2010. "Toward unified satellite climatology of aerosol properties: 3 MODIS versus MISR versus AERONET." J Quant Spectrosc Radiat Transfer 111 (4): 540-552 [10.1016/j.jqsrt.2009.11.003] [Journal Article/Letter]

2009. "Polarimetric remote sensing of aerosols over land." J. Geophys. Res. 114 (D1): D01206 [10.1029/2008JD010619] [Journal Article/Letter]

2009. "Toward unified satellite climatology of aerosol properties: What do fully compatible MODIS and MISR aerosol pixels tell us?." J Quant Spectrosc Radiat Transfer 110 (6-7): 402-408 [10.1016/j.jqsrt.2009.01.007] [Journal Article/Letter]

2008. "Gustav Mie and the Evolving Discipline of Electromagnetic Scattering by Particles." Bull. Amer. Meteorol. Soc. 89 (12): 1853-1861 [10.1175/2008BAMS2632.1] [Journal Article/Letter]

2007. "Long-Term Satellite Record Reveals Likely Recent Aerosol Trend." Science 315 (5818): 1543-1543 [10.1126/science.1136709] [Journal Article/Letter]

2007. "Accurate Monitoring of Terrestrial Aerosols and Total Solar Irradiance: Introducing the Glory Mission." Bulletin of the American Meteorological Society 88 (5): 677-691 [10.1175/BAMS-88-5-677] [Journal Article/Letter]

2007. "Past, present, and future of global aerosol climatologies derived from satellite observations: A perspective." J Quant Spectrosc Radiat Transfer 106 (1-3): 325-347 [10.1016/j.jqsrt.2007.01.007] [Journal Article/Letter]

2006. "Modeling single-scattering properties of small cirrus particles by use of a size-shape distribution of ice spheroids and cylinders." J Quant Spectrosc Radiat Transfer 101 (3): 488-497 [10.1016/j.jqsrt.2006.02.040] [Journal Article/Letter]

2006. "Contribution of water-leaving radiances to multiangle, multispectral polarimetric observations over the open ocean: bio-optical model results for case 1 waters." Applied Optics 45 (22): 5542 [10.1364/AO.45.005542] [Journal Article/Letter]

2005. "Remote sensing of terrestrial tropospheric aerosols from aircraft and satellites." J Phys Conf Series 6 73-89 [10.1088/1742-6596/6/1/005] [Journal Article/Letter]

2004. "Mapping of Io's thermal radiation by the Galileo photopolarimeter–radiometer (PPR) instrument." Icarus 169 (1): 127-139 [10.1016/j.icarus.2003.12.021] [Journal Article/Letter]

2004. "Scattering and radiative properties of semi-external versus external mixtures of different aerosol types." J Quant Spectrosc Radiat Transfer 88 (1-3): 139-147 [10.1016/j.jqsrt.2003.12.032] [Journal Article/Letter]

2004. "Monitoring of aerosol forcing of climate from space: Analysis of measurement requirements." J Quant Spectrosc Radiat Transfer 88 (1-3): 149-161 [10.1016/j.jqsrt.2004.03.030] [Journal Article/Letter]

2004. "Modeling of atmospheric radiative transfer with polarization and its application to the remote sensing of tropospheric ozone." J Quant Spectrosc Radiat Transfer 84 (2): 169-179 [10.1016/S0022-4073(03)00140-7] [Journal Article/Letter]

2004. "Using the PARAGON Framework to Establish an Accurate, Consistent, and Cohesive Long-Term Aerosol Record." Bulletin of the American Meteorological Society 85 (10): 1535-1548 [10.1175/BAMS-85-10-1535] [Journal Article/Letter]

2004. "PARAGON: An Integrated Approach for Characterizing Aerosol Climate Impacts and Environmental Interactions." Bull Amer Meteorol Soc 85 (10): 1491-1501 [10.1175/BAMS-85-10-1491] [Journal Article/Letter]

2002. "Case studies of aerosol retrievals over the ocean from multiangle, multispectral photopolarimetric remote sensing data." J Atmos Sci 59 (3): 383-397 [10.1175/1520-0469(2002)059<0383:CSOARO>2.0.CO;2] [Journal Article/Letter]

2002. "Scattering, Absorption, and Emission of Light by Small Particles." [Book]

2002. "Spatial and temporal variations of Venus haze properties obtained from Pioneer Venus Orbiter polarimetry." J. Geophys. Res. 107 (E5): 5029 [10.1029/2001JE001502] [Journal Article/Letter]

2002. "Galileo Photopolarimetry of Jupiter at 678.5 nm." Icarus 157 (2): 401-418 [10.1006/icar.2002.6846] [Journal Article/Letter]

2001. "Retrieval of aerosol properties over the ocean using multispectral and multiangle Photopolarimetric measurements from the Research Scanning Polarimeter." Geophys. Res. Lett. 28 (2): 243-246 [10.1029/2000GL011783] [Journal Article/Letter]

2001. "Parameterized scattering matrices for small particles in planetary atmospheres." J Quant Spectrosc Radiat Transfer 69 (5): 585-604 [10.1016/S0022-4073(00)00103-5] [Journal Article/Letter]

2000. "Io's Thermal Emission from the Galileo Photopolarimeter- Radiometer." Science 288 (5469): 1198-1201 [10.1126/science.288.5469.1198] [Journal Article/Letter]

2000. "A new approach to computing theoretical polarization curves along the low latitude regions of a planetary disk observed at small phase angles." Appl Math Comput 116 (1-2): 115-132 [10.1016/S0096-3003(99)00199-X] [Journal Article/Letter]

1998. "Capabilities and limitations of a current FORTRAN implementation of the T-matrix method for randomly oriented, rotationally symmetric scatterers." J Quant Spectrosc Radiat Transfer 60 (3): 309-324 [10.1016/S0022-4073(98)00008-9] [Journal Article/Letter]

1998. "Analysis of temporal variations of the polarization of Venus observed by Pioneer Venus Orbiter." J Geophys Res 103 (E4): 8557-8574 [10.1029/98JE03558] [Journal Article/Letter]

1997. "Retrieving CCN column density from single-channel measurements of reflected sunlight over the ocean: A sensitivity study." Geophysical Research Letters 24 (21): 2655-2658 [10.1029/97GL02783] [Journal Article/Letter]

1997. "Satellite retrieval of aerosol properties over the ocean using measurements of reflected sunlight: Effect of instrumental errors and aerosol absorption." J. Geophys. Res. 102 (D12): 13543-13553 [10.1029/97JD01124] [Journal Article/Letter]

1997. "Satellite retrieval of aerosol properties over the ocean using polarization as well as intensity of reflected sunlight." J. Geophys. Res. 102 (D14): 16989-17013 [10.1029/96JD02425] [Journal Article/Letter]

1997. "Modeling phase functions for dustlike tropospheric aerosols using a shape mixture of randomly oriented polydisperse spheroids." J. Geophys. Res. 102 (D14): 16831-16847 [10.1029/96JD02110] [Journal Article/Letter]

1997. "A biwavelength analysis of Pioneer Venus polarization observations." J Geophys Res 102 (E5): 10,945-10,957 [10.1029/97JE00312] [Journal Article/Letter]

1996. "Photopolarimetry Analysis of the Venus Atmosphere in Polar Regions." Icarus 124 (2): 569-585 [10.1006/icar.1996.0231] [Journal Article/Letter]

1996. "Galileo Photopolarimeter-Radiometer Observations of Jupiter and the Galilean Satellites." Science 274 (5286): 389-391 [10.1126/science.274.5286.389] [Journal Article/Letter]

1996. "T-matrix computations of light scattering by nonspherical particles: A review." Journal of Quantitative Spectroscopy and Radiative Transfer 55 (5): 535-575 [10.1016/0022-4073(96)00002-7] [Journal Article/Letter]

1996. "Scattering of light by polydisperse, randomly oriented, finite circular cylinders." Applied Optics 35 (24): 4927 [10.1364/AO.35.004927] [Journal Article/Letter]

1995. "Nonsphericity of dust-like tropospheric aerosols: Implications for aerosol remote sensing and climate modeling." Geophysical Research Letters 22 (9): 1077-1080 [10.1029/95GL00798] [Journal Article/Letter]

1995. "Observation of Shoemaker-Levy Impacts by the Galileo Photopolarimeter Radiometer." Science 268 (5219): 1875-1879 [10.1126/science.268.5219.1875] [Journal Article/Letter]

1995. "Scattering of light by bispheres with touching and separated components." Applied Optics 34 (21): 4589 [10.1364/AO.34.004589] [Journal Article/Letter]

1995. "Low-cost long-term monitoring of global climate forcings and feedbacks." Climatic Change 31 (2-4): 247-271 [10.1007/BF01095149] [Journal Article/Letter]

1994. "T-matrix computations of light scattering by large spheroidal particles." Opt Comm 109 16-21 [Journal Article/Letter]

1994. "Quantifying and minimizing uncertainty of climate forcing by anthropogenic aerosols." Bull Amer Meteorol Soc 75 375-400 [Journal Article/Letter]

1994. "Errors induced by the neglect of polarization in radiance calculations for rayleigh-scattering atmospheres." Journal of Quantitative Spectroscopy and Radiative Transfer 51 (3): 491-510 [10.1016/0022-4073(94)90149-X] [Journal Article/Letter]

1994. "Light scattering by polydisperse, rotationally symmetric nonspherical particles: Linear polarization." Journal of Quantitative Spectroscopy and Radiative Transfer 51 (5): 759-778 [10.1016/0022-4073(94)90130-9] [Journal Article/Letter]

1994. "Light scattering by polydispersions of randomly oriented spheroids with sizes comparable to wavelengths of observation." Applied Optics 33 (30): 7206 [10.1364/AO.33.007206] [Journal Article/Letter]

1992. "Galileo Photopolarimeter/Radiometer experiment." Space Sci Rev 60 (1-4): 531-563 [10.1007/BF00216867] [Journal Article/Letter]

1989. "Croconic acid: An absorber in the Venus clouds?." Icarus 77 (2): 382-390 [10.1016/0019-1035(89)90095-X] [Journal Article/Letter]

1986. "The Jovian Atmospheres." NASA CP-2441 [Proceedings]

1983. "Efficient three-dimensional global models for climate studies: Models I and II." M. Weather Rev. 111 (4): 609-662 [10.1175/1520-0493(1983)111<0609:ETDGMF>2.0.CO;2] [Journal Article/Letter]

1982. "Polarization studies of the Venus UV contrasts: Cloud height and haze variability." Icarus 51 (2): 374-390 [10.1016/0019-1035(82)90090-2] [Journal Article/Letter]

1980. "Distribution and source of the UV absorption in Venus' atmosphere." J. Geophys. Res. 85 (A13): 8141-8150 [10.1029/JA085iA13p08141] [Journal Article/Letter]

1980. "Cloud and haze properties from Pioneer Venus polarimetry." J. Geophys. Res. 85 (A13): 8129-8140 [10.1029/JA085iA13p08129] [Journal Article/Letter]

1980. "The clouds of Venus: A synthesis report." J. Geophys. Res. 85 (A13): 8059-8081 [10.1029/JA085iA13p08059] [Journal Article/Letter]

1980. "Cloud morphology and motions from Pioneer Venus images." J. Geophys. Res. 85 (A13): 8107-8128 [10.1029/JA085iA13p08107] [Journal Article/Letter]

1979. "Nature of the Ultraviolet Absorber in the Venus Clouds: Inferences Based on Pioneer Venus Data." Science 205 (4401): 76-79 [10.1126/science.205.4401.76] [Journal Article/Letter]

1979. "Orbiter Cloud Photopolarimeter Investigation." Science 203 (4382): 781-785 [10.1126/science.203.4382.781] [Journal Article/Letter]

1979. "Cloud Images from the Pioneer Venus Orbiter." Science 205 (4401): 74-76 [10.1126/science.205.4401.74] [Journal Article/Letter]

1978. "Nature of the atmospheric dynamics on Venus from power spectrum analysis of Mariner 10 images." J. Atmos. Sci. 35 1584-1595 [Journal Article/Letter]

1977. "Dynamics, winds, circulation and turbulence in the atmosphere of venus (Chapter 7)." Space Sci. Rev. 20 (4): 357-387 [10.1007/BF02186459] [Journal Article/Letter]

1975. "On the origin of ultraviolet contrasts on Venus." J. Atmos. Sci. 32 1190-1200 [Journal Article/Letter]

1974. "Light scattering in planetary atmospheres." Space Sci. Rev. 16 (4): 527-610 [10.1007/BF00168069] [Journal Article/Letter]

1968. "Radiative Opacity in Stellar Atmospheres. I. Metal Absorption Coefficients." ApJL 154 689-714 [10.1086/149790] [Journal Article/Letter]


2006. "Multiple Scattering of Light by Particles: Radiative Transfer and Coherent Backscattering." [Book]