Sciences and Exploration Directorate

Larry D. Travis

(EMERITUS)

 larry.d.travis@nasa.gov

 212.678.5599

Org Code: 611

NASA/GISS
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.

Positions/Employment


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 

Education


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

Awards


NASA Exceptional Scientific Achievement Medal, 1980

Publications


Refereed

Mishchenko, M. I., L. Liu, I. V. Geogdzhayev, et al. J. Li, B. E. Carlson, B. Lacis, B. Lacis, and L. D. Travis. 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]

Chowdhary, J., B. Cairns, F. Waquet, et al. K. Knobelspiesse, M. Ottaviani, J. Redemann, L. Travis, and M. Mishchenko. 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]

Mishchenko, M. I., V. P. Tishkovets, L. D. Travis, et al. B. Cairns, J. M. Dlugach, L. Liu, V. K. Rosenbush, and N. N. Kiselev. 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]

Mishchenko, M. I., L. D. Travis, and D. W. Mackowski. 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]

Mishchenko, M. I., L. Liu, L. D. Travis, B. Cairns, and A. A. Lacis. 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]

Waquet, F., B. Cairns, K. Knobelspiesse, et al. J. Chowdhary, L. D. Travis, B. Schmid, and M. I. Mishchenko. 2009. Polarimetric remote sensing of aerosols over land J. Geophys. Res. 114 (D1): D01206 [10.1029/2008JD010619]

Mishchenko, M. I., I. V. Geogdzhayev, L. Liu, et al. A. A. Lacis, B. Cairns, and L. D. Travis. 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]

Mishchenko, M. I., and L. D. Travis. 2008. Gustav Mie and the Evolving Discipline of Electromagnetic Scattering by Particles Bull. Amer. Meteorol. Soc. 89 (12): 1853-1861 [10.1175/2008BAMS2632.1]

Mishchenko, M. I., I. V. Geogdzhayev, W. B. Rossow, et al. B. Cairns, B. E. Carlson, A. A. Lacis, L. Liu, and L. D. Travis. 2007. Long-Term Satellite Record Reveals Likely Recent Aerosol Trend Science 315 (5818): 1543-1543 [10.1126/science.1136709]

Mishchenko, M. I., B. Cairns, G. Kopp, et al. C. F. Schueler, B. A. Fafaul, J. E. Hansen, R. J. Hooker, T. Itchkawich, H. B. Maring, and L. D. Travis. 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]

Mishchenko, M. I., I. V. Geogdzhayev, B. Cairns, et al. B. E. Carlson, J. Chowdhary, A. A. Lacis, L. Liu, W. B. Rossow, and L. D. Travis. 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]

Liu, L., M. I. Mishchenko, B. Cairns, B. E. Carlson, and L. D. Travis. 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]

Chowdhary, J., M. I. Mishchenko, and L. D. Travis. 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]

Mishchenko, M. I., B. Cairns, J. Chowdhary, et al. I. V. Geogdzhayev, L. Liu, and L. D. Travis. 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]

Rathbun, J. A., J. R. Spencer, T. Z. Tamppari, et al. T. Z. Tamppari, L. Barnard, and L. D. Travis. 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]

Mishchenko, M. I., L. Liu, L. D. Travis, and A. A. Lacis. 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]

Mishchenko, M. I., B. Cairns, J. E. Hansen, et al. L. D. Travis, R. Burg, Y. J. Kaufman, J. V. Martins, and E. P. Shettle. 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]

Jiang, Y., Y. L. Yung, S. P. Sander, and L. D. Travis. 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]

Diner, D. J., R. T. Menzies, R. A. Kahn, et al. T. L. Anderson, J. Bosenberg, R. J. Charlson, B. N. Holben, C. A. Hostetler, M. A. Miller, J. A. Ogren, G. L. Stephens, O. Torres, B. A. Wielicki, P. J. Rasch, L. D. Travis, and W. D. Collins. 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]

Diner, D. J., T. P. Ackerman, T. L. Anderson, et al. J. Bosenberg, A. J. Braverman, R. J. Charlson, W. D. Collins, R. Davies, B. N. Holben, C. A. Hostetler, R. A. Kahn, J. V. Martonchik, R. T. Menzies, M. A. Miller, J. A. Ogren, J. E. Penner, P. J. Rasch, S. E. Schwartz, J. H. Seinfeld, G. L. Stephens, O. Torres, L. D. Travis, B. A. Wielicki, and B. Yu. 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]

Chowdhary, J., B. Cairns, and L. D. Travis. 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]

Mishchenko, M. I., L. D. Travis, and A. A. Lacis. 2002. Scattering, Absorption, and Emission of Light by Small Particles

Braak, C. J., J. F. de Haan, J. W. Hovenier, and L. D. Travis. 2002. Spatial and temporal variations of Venus haze properties obtained from Pioneer Venus Orbiter polarimetry J. Geophys. Res. 107 (E5): 5029 [10.1029/2001JE001502]

Braak, C. J., J. F. de Haan, J. W. Hovenier, and L. D. Travis. 2002. Galileo Photopolarimetry of Jupiter at 678.5 nm Icarus 157 (2): 401-418 [10.1006/icar.2002.6846]

Chowdhary, J., B. Cairns, M. Mishchenko, and L. Travis. 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]

Braak, C. J., J. F. de Haan, C. V. van der Mee, J. W. Hovenie, and L. D. Travis. 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]

Spencer, J. R., J. A. Rathbun, L. D. Travis, et al. L. K. Tamppari, L. Barnard, T. Z. Martin, and A. S. McEwen. 2000. Io's Thermal Emission from the Galileo Photopolarimeter- Radiometer Science 288 (5469): 1198-1201 [10.1126/science.288.5469.1198]

Kawabata, K., O. Sato, and L. D. Travis. 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]

Mishchenko, M. I., and L. D. Travis. 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]

Knibbe, W. J., J. F. Haan, J. W. Hovenier, and L. D. Travis. 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]

Mishchenko, M. I., L. D. Travis, W. B. Rossow, et al. B. Cairns, B. E. Carlson, and Q. Han. 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]

Mishchenko, M. I., and L. D. Travis. 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]

Mishchenko, M. I., and L. D. Travis. 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]

Mishchenko, M. I., L. D. Travis, R. A. Kahn, and R. A. West. 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]

Knibbe, W. J., J. F. de Haan, J. W. Hovenier, and L. D. Travis. 1997. A biwavelength analysis of Pioneer Venus polarization observations J Geophys Res 102 (E5): 10,945-10,957 [10.1029/97JE00312]

Sato, M., L. D. Travis, and K. Kawabata. 1996. Photopolarimetry Analysis of the Venus Atmosphere in Polar Regions Icarus 124 (2): 569-585 [10.1006/icar.1996.0231]

Orton, G. S., J. R. Spencer, L. D. Travis, T. Z. Martin, and L. K. Tamppari. 1996. Galileo Photopolarimeter-Radiometer Observations of Jupiter and the Galilean Satellites Science 274 (5286): 389-391 [10.1126/science.274.5286.389]

Mishchenko, M. I., L. D. Travis, and D. W. Mackowski. 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]

Mishchenko, M. I., L. D. Travis, and A. Macke. 1996. Scattering of light by polydisperse, randomly oriented, finite circular cylinders Applied Optics 35 (24): 4927 [10.1364/AO.35.004927]

Mishchenko, M. I., A. A. Lacis, B. E. Carlson, and L. D. Travis. 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]

Martin, T. Z., G. S. Orton, L. D. Travis, L. K. Tamppari, and I. Claypool. 1995. Observation of Shoemaker-Levy Impacts by the Galileo Photopolarimeter Radiometer Science 268 (5219): 1875-1879 [10.1126/science.268.5219.1875]

Mishchenko, M. I., D. W. Mackowski, and L. D. Travis. 1995. Scattering of light by bispheres with touching and separated components Applied Optics 34 (21): 4589 [10.1364/AO.34.004589]

Hansen, J., W. Rossow, B. Carlson, et al. A. Lacis, L. Travis, A. Del Genio, I. Fung, B. Cairns, M. Mishchenko, and I. Sato. 1995. Low-cost long-term monitoring of global climate forcings and feedbacks Climatic Change 31 (2-4): 247-271 [10.1007/BF01095149]

Mishchenko, M. I., and L. D. Travis. 1994. T-matrix computations of light scattering by large spheroidal particles Opt Comm 109 16-21

Penner, J. E., R. J. Charlson, J. M. Hales, et al. N. S. Laulainen, R. Leifer, T. Novakov, J. Ogren, L. F. Radke, S. E. Schwartz, and L. Travis. 1994. Quantifying and minimizing uncertainty of climate forcing by anthropogenic aerosols Bull Amer Meteorol Soc 75 375-400

Mishchenko, M. I., A. A. Lacis, and L. D. Travis. 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]

Mishchenko, M. I., and L. D. Travis. 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]

Mishchenko, M. I., and L. D. Travis. 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]

Russell, E. E., F. G. Brown, R. A. Chandos, et al. W. C. Fincher, L. F. Kubel, A. A. Lacis, and L. D. Travis. 1992. Galileo Photopolarimeter/Radiometer experiment Space Sci Rev 60 (1-4): 531-563 [10.1007/BF00216867]

Hartley, K. K., A. R. Wolff, and L. D. Travis. 1989. Croconic acid: An absorber in the Venus clouds? Icarus 77 (2): 382-390 [10.1016/0019-1035(89)90095-X]

Allison, M. D., and L. D. Travis. 1986. The Jovian Atmospheres NASA CP-2441

Hansen, J., G. L. Russell, D. H. Rind, et al. P. Stone, A. A. Lacis, S. Lebedeff, R. A. Ruedy, and L. D. Travis. 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]

Esposito, L. W., and L. D. Travis. 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]

Pollack, J. B., O. B. Toon, R. C. Whitten, et al. R. Boese, B. Ragent, M. Tomasko, L. Esposito, L. Travis, and D. Wiedman. 1980. Distribution and source of the UV absorption in Venus' atmosphere J. Geophys. Res. 85 (A13): 8141-8150 [10.1029/JA085iA13p08141]

Kawabata, K., D. L. Coffeen, J. E. Hansen, et al. W. A. Lane, M. Sato, and L. D. Travis. 1980. Cloud and haze properties from Pioneer Venus polarimetry J. Geophys. Res. 85 (A13): 8129-8140 [10.1029/JA085iA13p08129]

Knollenberg, R., L. Travis, M. Tomasko, et al. P. Smith, B. Ragent, L. Esposito, D. McClesse, J. Martonchik, and R. Beer. 1980. The clouds of Venus: A synthesis report J. Geophys. Res. 85 (A13): 8059-8081 [10.1029/JA085iA13p08059]

Rossow, W. B., A. D. Del Genio, S. S. Limaye, L. D. Travis, and P. H. Stone. 1980. Cloud morphology and motions from Pioneer Venus images J. Geophys. Res. 85 (A13): 8107-8128 [10.1029/JA085iA13p08107]

Pollack, J. B., B. Ragent, R. Boese, et al. M. G. Tomasko, J. Blamont, R. G. Knollenberg, L. W. Esposito, I. A. Stewart, and L. Travis. 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]

Travis, L. D., D. L. Coffeen, J. E. Hansen, et al. K. Kawabata, A. A. Lacis, W. A. Lane, S. S. Limaye, and P. H. Stone. 1979. Orbiter Cloud Photopolarimeter Investigation Science 203 (4382): 781-785 [10.1126/science.203.4382.781]

Travis, L. D., D. L. Coffeen, A. D. Del Genio, et al. J. E. Hansen, K. Kawabata, A. A. Lacis, W. A. Lane, S. S. Limaye, W. B. Rossow, and P. H. Stone. 1979. Cloud Images from the Pioneer Venus Orbiter Science 205 (4401): 74-76 [10.1126/science.205.4401.74]

Travis, L. D. 1978. Nature of the atmospheric dynamics on Venus from power spectrum analysis of Mariner 10 images J. Atmos. Sci. 35 1584-1595

Schubert, G., C. C. Counselman, J. Hansen, et al. S. S. Limaye, G. Pettengill, A. Seiff, I. I. Shapiro, V. E. Suomi, F. Taylor, L. Travis, R. Woo, and R. E. Young. 1977. Dynamics, winds, circulation and turbulence in the atmosphere of venus (Chapter 7) Space Sci. Rev. 20 (4): 357-387 [10.1007/BF02186459]

Travis, L. D. 1975. On the origin of ultraviolet contrasts on Venus J. Atmos. Sci. 32 1190-1200

Hansen, J. E., and L. D. Travis. 1974. Light scattering in planetary atmospheres Space Sci. Rev. 16 (4): 527-610 [10.1007/BF00168069]

Travis, L. D., and S. Matsushima. 1968. Radiative Opacity in Stellar Atmospheres. I. Metal Absorption Coefficients ApJL 154 689-714 [10.1086/149790]

Non-Refereed

Mishchenko, M. I., L. D. Travis, and A. A. Lacis. 2006. Multiple Scattering of Light by Particles: Radiative Transfer and Coherent Backscattering