Profile for Ellsworth Welton


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Title: Physical Scientist
Affiliation: NASA
Contact: E-mail
Office Phone: 301-614-6279
Fax: 301-614-5492

Education

Ph.D. 1998 - Physics - University of Miami

M.S. 1996 - Physics - University of Miami

B.S. 1993 - Physics - Minor Mathematics - Jacksonville University

Biography

Dr. Welton has specialized in aerosol related research since 1994, particularly characterization of the optical and physical properties of various aerosol species. In addition, he is an expert in the use of lidar and radiometry to retrieve aerosol and cloud properties. Dr. Welton has been active in lidar research since 1996, and is the Principal Investigator for the NASA Micro Pulse Lidar Network (MPLNET) – a federated network of lidar sites around the world. Dr. Welton was an atmospheric team member on NASA’s Geoscience Laser Altimeter System (GLAS), and is a science team member for the agency’s current lidar mission, CALIPSO. Dr. Welton is also the Deputy Project Scientist for NASA's Glory mission. Glory, scheduled to launch in November 2010, is a climate mission that will obtain detailed information on aerosol properties from space and continue NASA's long term series of solar irradiance measurements. Finally, Dr. Welton is also a member of the science working group formulating the Aerosols, Clouds, and Ecosystems (ACE) mission recommended in the 2007 NRC Earth Sciences Decadal report for NASA.

 

Research Interests

Publications

Huang, J., N.C. Hsu, S-C Tsay, B. N. Holben, E.J. Welton, A. Smirnov, M.J. Jeong, R. Hansell, T. Berkoff, Z. Liu, G.R. Liu, J.R. Campbell, S.C. Liew, and J.E. Barnes (2012). Evaluations of cirrus contamination and screening in ground aerosol observations using collocated lidar systems.. J. Geophy. Res., 117.
doi:10.1029/2012JD017757

Berkoff, T., Mikail Sorokin, Tom Stone, Thomas F. Eck, Raymond Hoff, E.J. Welton, and Brent Holben (2011). • Nocturnal Aerosol Optical Depth Measurements with a Small-Aperture Automated Photometer Using the Moon as a Light Source. J.Atmos.Oceanic.Technol., 28(10), 1297–1306.
http://dx.doi.org/10.1175/JTECH-D-10-05036.1

Chew, Boon Ning, James R. Campbell, Jeffery S. Reid, David M. Giles, E.J. Welton, Santo V. Salinas , and Soo Chin Liew (2011). Tropical cirrus cloud contamination in sun photometer data. Atmos.Environ., 45(37), 6724-6731.
doi:10.1016/j.atmosenv.2011.08.017

Liu, Jianjun, Youfei Zheng, Zhanqing Li, Connor Flynn, E.J. Welton, and Mareen Cribb (2011). Transport, vertical structure and radiative properties of dust events in southeast China determined from ground and space sensors. Atmos.Environ., 45(35), 6469-6480.
10.1016/j.atmosenv.2011.04.031

Liu, Yang, Zifeng Wang, Jun Wang, Richard A. Ferrare, Robert K. Newsom, and E.J. Welton (2011). The Effect of Aerosol Vertical Profiles on Satellite-Estimated Surface Particle Sulfate Concentrations. Remote Sensing of Environment, 115(2), 508-513.
http://dx.doi.org/10.1016/j.rse.2010.09.019,

Miller, David J., Kang Sun, Mark A. Zondlo, David Kanter, Oleg Dubovik, E.J. Welton, David M. Winker, and Paul Ginoux (2011). Assessing boreal forest fire smoke aerosol impacts on U.S. air quality: A case study using multiple data sets. J.Geophys.Res., 116(D22209), 19 Pages.
10.1029/2011JD016170

Wang S. -H., N. -H. Lin, M. -D. Chou, S.-C. Tsay, D. Giles, E.J. Welton, and B. Holben (2010). Profiling Transboundary Aerosols over Taiwan and Assessing their Radiative Effects. J. Geophys. Res., D00K31, 115.
doi10.1029/2009JO013798

Campbell J.R., E.J. Welton, and J.D. Spinhirne (2009). Continous Lidar Monitoring of Polar Stratopheric Clouds at the South Pole. Bull.Amer.Meteor.Soc., 22(9), 5232–5250 .
doi:10.1175/2009JCLI2949.1

Campbell J., K. Sassen, and E.J. Welton (2008). Elevated Cloud and Aerosol Layer Retrievals from Micropulse Lidar Signal Profiles. J. Atmos. Ocean. Tech., 25(5), 685-700.
doi:10.1175/2007JTECHA1034.1

Chiu J.C., A. Marshak, W.J. Wiscombe, S. C. Valencia, and E.J. Welton (2007). Cloud optical depth retrievals from solar background. IEEE Geosci. Remote Sens. Lett., No. 3, 4, 456-460.
10.1109/LGRS.2007.896722

Kuzmanoski M., M.A. Box, B. Schmid, G.P. Box, J. Wang, P.B. Russel, D. Bates, H.H. Johnson, E.J. Welton, R.C. Flagan, and J.H. Seinfield (2007). Aerosol properties computed aircraft-based observations during the ACE-Asia campaign: 2. A case study of lidar ratio closure and aerosol radiative effects. Aerosol Sci. Tech., 41, 231-243.

Lund Myhre C., C. Toledano, G. Myhre, K. Stebel, K. Yttri, V. Aaltonen, M. Johnsrud, M. Frioud, V. Cachorro, A. de Frutos, H. Lihavainen, J. Campell, A. Chaikovsky, M. Shiobara, E.J. Welton, and K. Torseth (2007). Regional aerosol optical properties and radiative impact of the extreme smoke event in the European Arctic in Spring 2006. J. Polar Meteor. and Glaciology, 7, 5899-5915.

Schmid B., R. Ferrare, C. Flynn, R. Elleman, D. Covert, A. Strawa, E.J. Welton, D. Turner, H. Jonsson, J. Redemann, J. Eiilers, J. Ricci, A.G. Hallar, M. Clayton, J. Michalsky, A. Smirnov, B. Holben, B. Holben, and J. Bernard (2007). How well do state-of-the-art techniques measuring the vertical profile of tropospheric aerosol extinction compare?. J. Geophys. Res. Atmos., 111(D05S07).
10.1029/2005JD005837

Shiobara M., W. Hart, J.R. Campbell, E.J. Welton, J.D. Spinhirne, R. Neuber, M. Yabuki, and T. Berkoff (2007). Arctic experiment for the ICESat/GLAS ground validation with a Micro-Pulse Lidar at Ny-Alesund, Syalbard. J. Polar Meteor. and Glaciology, 20, 28-39.

Hlavka, D., E.J. Welton, M. McGill, J.D. Spinhirne, W. Hart, and S. Palm (2005). Aerosol and cloud optical depth from GLAS: Results and verification for an October 2003 California fire smoke case.. Geophys. Res. Lett., 32(L22S07).
10.1029/2005GL023413

Spinhirne J., S. Palm, D. Hlavka, W. Hart, A. Mahesh, and E.J. Welton (2005). Aerosol and cloud observations and data products by the GLAS Polar Orbiting Lidar Instruments AMS 85th Annual Meeting

Spinhirne J., E.J. Welton, D. Hlavka, W. Hart, and S. Palm (2005). Cloud and aerosol measurements from GLAS: Overview of initial results. Geophys. Res. Lett., 32(L22S03).
10.1029/2005GL023507

Torres O., A. Syniuk, P.K. Bhartia, E.J. Welton, and B. Holben (2005). Total Ozone Mapping Spectrometer measurements of aerosol absorption from space: Comparison to SAFARI 2000 ground-based observations. J. Geophys. Res., 110, D10S18.
10.1029/2004JD004611

Colarco P.R., M.R. Schoeberl, B.G. Doddridge, L.T. Marufu, O. Torres, and E.J. Welton (2004). Transport of smoke from Canadian forest fires to the surface near Washington, D.C.: Injection height, entrainment, and optical properties. J. Geophys. Res., 109(D6), Art. No. D06203.

Kahn R., J. Anderson, T. Anderson, T. Bates, F. Brechtel, A. Clarke, E. Dutton, R. Flagan, R. Frouin, H. Fukushima, B. Holben, S. Howell, B. Huebert, A. Jefferson, H. Jonsson, K. Carricol, O. Kalashnikova, J. Kim, S. Kim, P. Kus, W. Li, J. Livingston, S. Masonis, C. McNaughton, J. Merrill, S. Mukai, T. Murayama, T. Nakajima, P. Quinn, J. Redemann, M. Rood, P. Russell, I. Sano, B. Schmid, J. Seinfeld, N. Sugimoto, J. Wang, E.J. Welton, J. -G Won, and S. -Chang Yoon (2004). Environmental snapshots for satellite multi-angle aerosol retrieval validation during the ACE-Asia Field Campaign. J. Geophys. Res., 109, D19S14.
10.1029/2003JD004339

Kahn R.A., J. Anderson, T.L. Anderson, T. Bates, F. Brechtel, C. M. Carrico, A. Clarke, S. J. Doherty, E. Dutton, R. Flagan, R. Frouin, H. Fukushima, B. Holben, S. Howell, B. Huebert, A. Jefferson, H. Jonsson, O. Kalashnikova, J. Kim, S. -W. Kim, P. Kus, W. -H. Li, J. M. Livingston, C. McNaughton, J. Merrill, S. Mukai, T. Murayama, T. Nakajima, P. Quinn, J. Redemann, M. Rood, P. Russell, I. Sano, B. Schmid, J. Seinfeld, N. Sugimoto, J. Wang, E.J. Welton, J. -G. Won, and S. -C. Yoon (2004). Environmental snapshots from ACE-Asia. J. Geophys. Res.jd004339.
2003

Quinn P.K., D.J. Coffman, T.S. Bates, E.J. Welton, D.S. Covert, T.L. Miller, J.E. Johnson, S. Maria, L. Russell, R. Arimoto, C.M. Carrico, M.J. Rood, and J. Anderson (2004). Aerosol optical properties mesured onboard the Ronald H Brown during ACE Asia as a function of Aerosol chemical compostion and source region. J. Geophys. Res. Atmos., 109(D19), Art. No. D19S01.

Calarco R P., O.B. Toon, J.S. Reid, J.M. Livingston, P.B. Russell, J. Redemann, B. Schmid, H.B. Maring, D. Savoie, E.J. Welton, J.R. Campbell, B.N. Holben, and R. Levy (2003). Saharan dust transport to the Caribbean during PRIDE:2.Transport, vertical profiles, and desposition in simulations of situ and remote sensing observations. J. Geophys. Res., 108, 8590.

Campbell J., E.J. Welton, J. Spinhirne, Q. Ji, S.-C. Tsay, S. Piketh, M. Barenbrug, and B. Holben (2003). Lidar observations of tropospheric aerosols over northeastern south Africa during the ARREX and SAFARI-2000 dry season experiments. J. Geophys. Res., 108(D13), 847.
10.1029/2002JD002563

Campbell J. R., E.J. Welton, J. D. Spinhirne, Q. Ji, S.C. Tsay, S. J. Piketh, M. Barenbrug, and B. N. Holben (2003). Lidar observations of tropospheric aerosols over northeastern South Africa during the ARREX and SAFARI-2000 dry season experiments. J. Geophys. Res. (D13), 8497, 108.
10.1029/2002JD002563

Livingston J. M., P. B. Russell, J. S. Reid, J. Redemann, B. Schmid, D. A. Allen, O. Torres, R.C. Levy, L.A. Remer, B. N. Holben, A. Smirnov, O. Dubovik, E.J. Welton, J. R. Campbell, J. Wang, and S. A. Christopher (2003). Airborne Sun photometer measurements of aerosol optical depth and columnar water vapor during the Puerto Rico Dust Experiment and comparison with land, aircraft, and satellite measurements. J. Geophys. Res.-Atmos. 108 (D19).

Livingston J.M., P.B. Russell, J.S. Reid, J. Redemann, B. Schmid, D.A. Allen, O. Torres, R.C. Levy, L.A. Remer, B.N. Holben, A. Smirnov, O. Dubovik, E.J. Welton, J.R. Campbell, J. Wang, and S.A. Christopher (2003). Airborne Sun photometer measurements of aerosol optical depth and columnarwater vapor during the Puerto Rico Dust Experiment and comparison with land, aircraft and satellite measurements. J. Geophys. Res., 108, 8588.
10.1029/2002JD002520

Markowicz K.M., P.J. Flatau, A.M. Vogelmann, P.K. Quinn, and E.J. Welton (2003). Clear-sky infrared aerosol radiative forcing at the surface and the top of the atmosphere. Q.J.R. Meteorl. Soc., 129, 2927-2947.

McGill, M., D. Hlavka, W. Hart, E.J. Welton, and J. Campbell (2003). Airborne lidar measurements of aerosol optical properties during SAFARI-2000. J. Geophys. Res., 108.
10.1029/2002JD002370

Reid J. S., J. E. Kinney, D. L. Westphal, B. N. Holben, E.J. Welton, S.C. Tsay, D. P. Eleuterio, J. R. Campbell, S. A. Christopher, P.R. Colarco, H. H. Jonsson, J. M. Livingston, H. B. Maring, M. M. Meier, P. Pilewskie, J. M. Prospero, E. A. Reid, L.A. Remer, P. B. Russell, D. L. Savoie, A. Smirnov, and D. Tanre (2003). Analysis of measurements of Saharan dust by airborne and ground-based remote sensing methods during the Puerto Rico Dust Experiment (PRIDE). J. Geophys. Res., 108, D19, 8586.
10.1029/2002JD002493

Reid J.S., J.E. Kinney, D.L. Westphal, B.N. Holben, E.J. Welton, S.-C. Tsay, D.P. Eleuterio, J.R. Campbell, S.A. Christopher, P.R. Colarco, H.H. Jonsson, J.M. Livingston, H.B. Maring, M.L. Meier, P. Pilewskie, J.M. Prospero, E.A. Reid, L.A. Remer, P.B. Russell, D.L. Savoie, A. Smirnov, and D. Tanre (2003). Analysis of measurements of Saharan dust by airborne and ground-based remote sensing methods during the Puerto Rico Dust Experiment (PRIDE). J. Geo. Res-Atmos., 108, 8586.
10.1029/2002JD002493

Schmid B., D.A. Hegg, J. Wang, D. Bates, J. Redemann, P.B. Russell, J.M. Livingston, H.H. Jonsson, E.J. Welton, J.H. Seinfeld, R.C. Flagan, D.S. Covert, O. Dubovik, and A. Jefferson (2003). Column closure studies of lower tropospheric aerosol and water vapor during ACE-Asia using airborne sunphotometer, airborne in-situ and ship-based lidar measurements. J. Geophys. Res., 108, 8656.
10.1029/2002JD003361

Schmid B., J. Redemann, P.B. Russell, P.V. Hobbs, D. Hlavka, M. McGill, B.N. Holben, E.J. Welton, J. Campbell, O. Torres, R.A. Kahn, D.J. Diner, M.C. Helmlinger, D.A. Chu, C. Robles Gonzalez, and G. de Leeuw (2003). Coordinated airborne, spaceborne, and ground-based measurements of massive, thick, aerosol layers during the dry season in Southern Africa. J. Geophys. Res., 108, 8496.
10.1029/2002JD002297

Schmid B., J. Redemann, P. B. Russell, P. V. Hobbs, D.L. Hlavka, M.J. McGill, B. N. Holben, E.J. Welton, J. R. Campbell, O. Torres, R.A. Kahn, D. J. Diner, M. C. Helmlinger, D. A. Chu, C. RoblesGonzalez, and G. deLeeuw (2003). Coordinated airborne, spaceborne, and ground-based measurements of massive, thick aerosol layers during the dry season in southern Africa. J. Geophys. Res., 108, D13, 8496.
10.1029/2002JD002297

Campbell J.R., D. Hlavka, E.J. Welton, C.J. Flynn, D.D. Turner, J.D. Spinhirne, V.S. Scott, and I.H. Hwang (2002). Full-time, eye-safe cloud and aerosol lidar observation at Atmospheric Radiation Measurement Program sites: Instruments and data processing. J. Atmos. Ocea. Tech., 19, 431-442.

Quinn P.K., D.J. Coffman, T.S. Bates, T.L. Miller, J.E. Johnson, E.J. Welton, C. Neususs, M. Miller, and P. Sheridan (2002). Aerosol optical properties during INDOEX 1999: Means, variability, and controlling factors. J. Geophys. Res., 107, 8020.
10.1029/2000JD000037

R.C. Flagan, J. Wang, J.H. Seinfeld, H.H. Jonsson, D.R. Collins, P.B. Russell. Schmid, J. Redemann, J.M. Livingston, S. Gao, D.A. Hegg, E.J. Welton, and D. Bates (2002). Clear-column radiative closure during ACE-asia: Comparison of multiwavelengthextinction derived from particle size and composition with results from Sun photometry. J. Geophys. Res., 107, 4688.

Welton, E.J., K.J. Voss, P.K. Quinn, P.J. Flatau, K. Markowicz, J.R. Campbell, J.D. Spinhirne, H.R. Gordon, and J.E. Johnson (2002). Measurements of aerosol vertical profiles and optical properties during INDOEX 1999 using micro-pulse lidar. J. Geophys. Res., 107, 8019.
10.1029/2000JD000038

Welton, E.J., and J.R. Campbell (2002). Micro-Pulse Lidar signals: Uncertainty analysis. J. Atmos. Ocea. Tech., 19, 2089-2094.

Campbell J.R., E.J. Welton, and J.D. Spinhirne (2001). Measurements of Polar Cloud Properties Through Continuous Long-Term Lidar Observation. Optical Remote Sensing of Atmosphere Meeting.

Hlavka, D., S. Palm, E.J. Welton, W. Hart, J. Spinhirne, M. McGill, and A. Mahesh (2001). Global Lidar Measurements of Clouds and Aerosols from Space Using the Geoscience Laser Altimeter System (GLAS) 2001 AGU Fall Meeting

Quinn P.K., D.J. Coffman, T.S. Bates, T.L. Miller, J.E. Johnson, K.J. Voss, E.J. Welton, and C. Neususs (2001). Dominant aerosol chemical components and their contribution to extinction during the aerosols99 cruise across the atlantic.. J. Geophys. Res., 106, 20783-20810.

Voss K.J., E.J. Welton, P.K. Quinn, R. Frouin, M. Miller, and M. Reynolds (2001). Aerosol optical depth measurements during the aerosols99 experiment. J. Geophys. Res., 106, 20811-20820.

Voss K.J., E.J. Welton, P.K. Quinn, J. Johnson, A. Thompson, and H. Gordon (2001). Lidar measurements during Aerosols99. J. Geophys. Res., 106, 20821-20832.

Welton, E.J., J.R. Campbell, J.D. Spinhirne, and V.S. Scott (2001). Global Monitoring of clouds and aerolsols using a network of micro-pulse lidar systems, in Lidar Remote Sensing for Industry and Enviormental Monitoring. Proc. SPIE, 4153, 151-158.

Welton, E.J., J.D. Spinhirne, J.R. Campbell, T. Berkoff, and D. Bates (2001). Measurements of the Vertical Structure of Aerosol and Clouds Over the Ocean using Micro-Pulse LIDAR Systems SIMBIOS Project Annual Report

Ackerman A.S., O.B. Toon, D.E. Stevens, A.J. Heymsfield, V. Ramanathan, and E.J. Welton (2000). Reduction of Tropical Cloudiness by Soot. Science, 228, 1042-1047.

Palm, S., D. Hlavka, B. Hart, E.J. Welton, and J. Spinhirne (2000). The Atmospheric Channels of GLAS: Near Real-Time Global Lidar Remote Sensing of Clouds and Aerosols from Space 20th Internationl Laser Radar Conference

Schmid B., J. Livingston, P. Russel, P. Durkee, H.H. Jonsson, D.R. Collins, R.C. Flagan, J.H. Seinfeld, S. Gasso, D.A. Hegg, E. Ostrom, K.J. Noone, E.J. Welton, K.J. Voss, H.R. Gordon, P. Formenti, and M.O. Andreae (2000). Clear Sky Closure Studies of Lower Tropospheric Aerosol and Water Vapor During ACE-2 using Airborne Sunphotometer, Airborne In-Situ, Space-Borne, and Ground-Based Measurements. Tellus B, 52, 567-592.

Welton, E.J., K.J. Voss, H.R. Gordon, H. Maring, A. Smirnov, B. Holben, B. Schmid, J. Livingston, P. Russell, P. Durkee, P. Formenti, and M.O. Andreae (2000). Ground-Based Lidar Measurements of Aerosols During ACE-2: Instrument Description, Results, and Comparisons with other Ground-Based Airborne Measurements. Tellus B, 52, 635-650.

Welton, E.J., P.J. Flatau, K.J. Voss, H.R. Gordon, K. Markowicz, J.R. Campbell, and J.D. Spinhirne (1999). Measurements of the Vertical Distribution of Aerosols and Clouds During INDOEX 1999 Using Micro-pulse Lidars 1999 AGU Fall Meeting

Smirnov A., B.N. Holben, I. Slutsker, E.J. Welton, and P. Formenti (1998). Optical Properties of Saharan Dust During ACE-2. J. Geophysical Research, 103, 28078-28092.