T. Paul Bui

Bio | Eduation | Employment | Campaigns | Publications

Staff, NASA Ames Research Center
MMS Principal Investigator, Alpha Jet Atmospheric eXperiment
Atmospheric Science Branch (SGG)
Business Email: thaopaul.v.bui@nasa.gov
Business Phone: (650) 604-5534
Website: https://airbornescience.nasa.gov/mms

Bio:

Mr. T. Paul Bui was born and raised in South Vietnam in the early 1960s. He evacuated to the U.S. in the ‘70s via Thailand.  He graduated from Massachusetts Institution of Technology with a B.S. (Electrical Engineering) in 1984. His post-graduate at Stanford University included studies in medical engineering, aeronautics, and cube-sat developments.  He was also a candidate for a M.S. from San Jose State University (Meteorology) in 1992.  In 1984, he joined NASA Ames as a software developer for the High Altitude Meteorological Measurement System (MMS) on the ER-2 platform, and participated in the start of the NASA atmospheric airborne field study.  He is now the MMS Principal Investigator with payload on the AJAX, ER-2, DC-8, Global-Hawk, WB-57F, and UAV-Sierra.

Education:
Candidate for M. S. Meteorology (coursework completed)
San Jose State University, 1992
B. S. Electrical Engineering
Massachusetts Institute of Technology, 1984
Senior Thesis: X-ray Satellite Development, Astronomy Dept.

Employment:
NASA-Ames Research Center, Moffett Field, CA
2002-Present: Principal Investigator, WB-57F Meteorological Measurement System
1997-Present: Principal Investigator, DC-8 Meteorological Measurement System
1995-Present: Principal Investigator, ER-2 Meteorological Measurement System
1984-1994: Lead Engineer, Meteorological Measurement System

Principal Investigator for the Following Airborne Campaigns:
STRAT Stratospheric Tracers and Transport (1995/1996)
SONEX Subsonic Assessment, Ozone and Nitrogen Oxide Experiment (1998)
POLARIS Photochemistry of Ozone Loss in the Arctic Region in Summer
CAMEX-3/4 Convection and Atmospheric Moisture Experiment (1998/2001)
SOLVE Sage Ozone Loss Validation Experiment (2000)
CRYSTAL-FACE Cirrus Regional Study of Tropical Anvils and Cirrus Layers (2002)
MidCix Middle Latitude Cirrus Experiment (May 2004)
JAVE/WIIF AURA Validation Experiment (AVE) & Water Isotope Intercomparison (June 2005)
CRAVE Costa Rica AVE remote & in-situ payload (Jan-Feb 2006)
NAMMA NASA African Monsoon Multidisciplinary Activities (summer 2006)
TC4 Tropical Composition, Cloud, and Climate Coupling Experiment 2007
NOVICE Newly Operating and Validated Instruments Comparison Experiment 2008
CASIE Characterization of Arctic Sea Ice Experiment, Sierra UAV 2009
GLOPAC Global Hawk Pacific Mission, Global Hawk UAV 2010
GRIP Genesis and Rapid Intensification Processes, DC-8 2010
MACPEX Mid-latitude Airborne Cirrus Properties Experiment, WB57 2011
RRV Sierra Rail Road Valley, Sierra 2011
DC3 Deep Convection Clouds & Chemistry, DC-8 2012
SEAC4RS Emission Studies and Climate Coupling, DC-8 & ER-2, 2013
ATTREX-EV Airborne Tropical TRopopause Experiment, Global Hawk, 2010-2014
AJAX Alpha Jet Atmospheric Experiment, Alpha Jet, 2014-present
VIRGAS Volcano-plume Investigation Readiness and Gas-phase and Aerosol Sulfur, WB57 2015
ATOM:1-4 Atmospheric Tomography Mission, DC-8 2015-2019
POSIDON Pacific Oxidants Sulfur, Ice, Dehydration cONvection, WB57 2016
SARP Student Airborne Research Program, DC-8 2018, 2019
HIWC High Ice Water Content (NASA Glenn & FAA), DC-8 2018
FIREX-AQ Fire Influence on Regional/Global Environments Exp, DC-8-2019

Relevant Publications:
Spanu, A., M. Dollner, J. Gasteiger, T.P. Bui, and B. Weinzierl. 2020. ATom: In-Situ Measurements of Airflow and Aerosols from Multiple Airborne Campaigns. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1784

Dean-Day, J., T. P. Bui, C. Chang, T. Hanisco, G. Wolfe, Evaluating Spatial Scales of Eddy Covariance Fluxes over the Southeast US using 20 Hz Wind and Temperature Data from the NASA DC-8 MMS, SEAC4RS Science Meeting at Caltech, Pasadena, CA, April 2015

Dean-Day, J., T. P. Bui, C. Chang, An Intercomparison of the NASA DC-8 MMS with the NCAR G-V Met System and Nearby Vaisala GPS Radiosondes. DC-3 Science Meeting, Boulder, CO, February 2013

Bui, T. P., S. Bowen, C. Chang, J. DeanDay, L. Pfister, R. Castenada, P. Shulman, Evaluating WB-57F and ER-2 MMS measurement confidence, CRYSTAL-FACE Science Meeting at Salt Lake City, Feb. 2003

Dean-Day, J., T. P. Bui, C. Chang, R. Castaneda, Wave Cloud Dynamics in MMS Data, MidCix Workshop, University of Utah, Salt Lake City, Oct. 2005

Gaines, S. E., S. W. Bowen, R. S. Hipskind, T.P. Bui, and K. R. Chan, Comparisons of the NASA ER-2 meteorological measurement system with radar tracking and radiosonde data, J. Atmos. Ocean. Tech., 9, 210-225, 1992

Scott, S. G., T.P. Bui, K. R. Chan, and S. W. Bowen, The meteorological measurement system on the NASA ER-2 aircraft, J. Atmos. Ocean. Tech., 7, 525-540, 1990

Other Publications:

Spanu, A., Dollner, M., Gasteiger, J., Bui, T. P., and Weinzierl, B.: Flow-induced errors in airborne in situ measurements of aerosols and clouds, Atmos. Meas. Tech., 13, 1963–1987, https://doi.org/10.5194/amt-13-1963-2020, April 2020

Katich, J. M., B . H. Samset, T. P. Bui, M. Dollner, K. D. Froyd, P. Campuzano-Jost, B. A. Nault, J. C. Schroder, B. Weinzierl, and J. P. Schwarz (2018), Strong contrast in remote black carbon aerosol loadings between the Atlantic and Pacific basins, J. Geophys. Res. Atmos., https://doi.org/10.1029/2018JD029206.

Pan, L. L., S. B. Honomichl, T. V. Bui, T. Thornberry, A. Rollins, E. Hintsa, and E. J. Jensen (2018), Lapse rate or cold point: The tropical tropopause identified by in situ trace gas measurements, Geophys.Res. Lett., 45, https://doi.org/10.1029/2018GL079573.

Woods, S., R. P. Lawson, E. Jensen, P. Bui, T. Thornberry, A. Rollins, L. Pfister, and M. Avery (2018), Microphysical properties of Tropical Tropopause Layer (TTL) cirrus, J. Geophys. Res. Atmos., https://doi.org/10.1029/2017JD028068

Tadić, Jovan M., Anna M. Michalak, Laura Iraci, Velibor Ilić,Sébastien C. Birau, Daniel R. Feldman, Thaopaul Bui, Matthew S. Johnson, Max Loewenstein,Seongeun Jeong, Marc L. Fischer, Emma L. Yates, and Ju-Mee Ryoo, Elliptic Cylinder Airborne Sampling and Geostatistical Mass Balance Approach for Quantifying Local Greenhouse Gas Emissions, Environ. Sci. Technol., doi: 10.1021/acs.est.7b03100, July 2017

Rollins, A. W., Thornberry, T. D., Ciciora, S. J., McLaughlin, R. J., Watts, L. A., Hanisco, T. F., Baumann, E., Giorgetta, F. R., Bui, T. V., Fahey, D. W., and Gao, R.- S.: A laser-induced fluorescence instrument for aircraft measurements of sulfur dioxide in the upper troposphere and lower stratosphere, Atmos. Meas. Tech., 9, 4601- 4613, https://doi.org/10.5194/amt-9-4601-2016, 2016

Bergman, John W., E. Jensen, L. Pfister and T. P. Bui, Air parcel trajectory dispersion near the tropical tropopause, Journal of Geophysical Research, April 2016

Jensen, Eric. J, Rei Ueyama, Leonhard Pfister, Thaopaul V. Bui, R. Paul Lawson, Sarah Woods, Troy Thornberry, Andrew W. Rollins, Glenn S. Diskin, Joshua P. DiGangi, and Melody A. Avery, On the Susceptibility of Cold Tropical Cirrus to Ice Nuclei Abundance, Journal of the Atmospheric Sciences, April 2016

Rollins, A. W, T. D. Thornberry, R.S. Gao, S. Woods, R.P. Lawson, T. P. Bui, E. J. Jensen and D. W. Fahey, Observational constraints on the efficiency of dehydration mechanisms in the tropical tropopause layer, Geophys. Res. Letters, doi: 10.1002/2016GL067972, March 2016

Hamill, Laura T. Iraci, Emma L. Yates, Warren Gore, T. Paul Bui, Tomoaki Tanaka, and Max Loewenstein, A New Instrumented Airborne Platform for Atmospheric Research, Bulletin of the American Meteorological Society, April 2016

Wolfe,G. M., T. F. Hanisco, H. L. Arkinson, T. P. Bui, J. D. Crounse, J. Dean‐Day, A. Goldstein, A. Guenther, S. R. Hall, G. Huey, et al, Quantifying sources and sinks of reactive gases in the lower atmosphere using airborne flux observations, Geophys. Res. Letters , vol: 42, 8231–8240, DOI: 10.1002/2015GL065839, Oct 2015

Jensen, E., R.P.Lawson, J.W.Bergman, L.Pfister, T. P. Bui and C.G.Schmitt, Physical processes controlling ice concentrations in synoptically-forced, midlatitude cirrus, Journal of Geophysical Research, April 2013

Avery, M., et al. (2010), Convective distribution of tropospheric ozone and tracers in the Central American ITCZ region: Evidence from observations during TC4, J. Geophys. Res., 115, D00J21, doi:10.1029/2009JD013450.

Salawitch, R. J., et al. (2010), A new interpretation of total column BrO during Arctic spring, Geophys. Res. Letters, Vol. 37, doi: 10.1029/2010GL043798.

Park, S., Atlas, E. L., Jiménez, R., Daube, B. C., Gottlieb, E. W., Nan, J., Jones, D. B. A., Pfister, L., Conway, T. J., Bui, T. P., Gao, R.-S., and Wofsy, S. C.: Vertical transport rates and concentrations of OH and Cl radicals in the Tropical Tropopause Layer from observations of CO2 and halocarbons: implications for distributions of long- and short-lived chemical species, Atmos. Chem. Phys., 10, 6669-6684, doi:10.5194/acp- 10-6669-2010, 2010.

Gao, R.S., D.W. Faheya, P.J. Popp, T.P. Marcya, R.L. Herman, E.M. Weinstock, J.B. Smith, D.S. Sayres, J.V. Pittman, K.H. Rosenlof, T.L. Thompson, T.P. Bui, D.G. Baumgardner, B.E. Anderson, G. Kok, A.J. Weinheimer, Measurements of relative humidity in a persistent contrail, Atmospheric Environment 40 (2006) 1590–1600

Garrett, J. Timothy, J. Dean-Day, C. Liu, B. Barnett, G. Mace, D. Baumgardner, C. Webster, T. P. Bui, W. G. Read, and P. Minnis, Convective formation of pileus cloud near the tropopause, Atmospheric Chemistry and Physics, 2006, Vol.6, pp. 1185-120

Wang, Ling, M. Alexander, T. P. Bui, and M. Mahoney, Small-scale gravity waves in ER-2 MMS/MTP wind and temperature measurements during CRYSTAL-FACE, Atmospheric Chemistry and Physics, accepted feb 2006

Om Prakash Tripathi, Sophie Godin-Beekmann, Franck Lefèvre, Marion Marchand, Andrea Pazmiño, Alain Hauchecorne, Florence Goutail, Hans Schlager, C. Michael Volk, B. Johnson, G. König-Langlo, Stefano Balestri, Fred Stroh, T. P. Bui, H. J. Jost, T. Deshler and Peter von der Gathen, High resolution simulation of recent Arctic and Antarctic stratospheric chemical ozone loss compared to observations, Journal of Atmospheric Chemistry, Springer Netherlands, 10.1007/s10874-006-9028-8, Sept 2006

Garrett, T. J., A. J. Heymsfield, M. J. McGill, B. A. Ridley, D. G. Baumgardner, T. P. Bui, and C. R. Webster (2004), Convective generation of cirrus near the tropopause, J. Geophys. Res., 109, D21203, doi:10.1029/2004JD004952. (Nov 2004)

Garrett, T. J., B. C. Navarro, C. H. Twohy, E. J. Jensen, P. T. Bui, D. G. Baumgardner, H. Gerber, R. L. Herman, A. J. Heymsfield, P. Lawson, P. Minnis, L. Nguyen, M. Poellot, S. K. Pope, F. P. J. Valero, and E. M. Weinstock. 2005. Evolution of a Florida cirrus anvil. J. Atmospheric Sciences, 62(7): 2352-2372, doi: 10.1175/JAS3495.1.

Tuck, F. Adrian, S. J. Hovde, E. C. Richard, R. S. Gao, T. P. Bui, W. H. Swartz, and S. A. Lloyd. 2005. Molecular velocity distributions and generalized scale invariance in the turbulent atmosphere. The Royal Society of Chemistry, 130, 1-13, 2005, doi: 10.1039/b410551F.

Canty, T., E. D. Riviere, R. J. Salawitch, G. Berthet, J.-B. Renard, K. Pfeilsticker, M. Dorf, A. Butz, H. Bosch, R. M. Stimpfle, D. M. Wilmouth, E. C. Richard, D. W. Fahey, P. J. Popp, M. R. Schoeberl, L. R. Lait, and T. P. Bui, Nighttime OClO in the winter Arctic vortex, J. Geophys. Res., 110, D01301, doi:10.1029/2004JD005035.

Tuck, A. F., S. J. Hovde, T. P. Bui, Scale invariance in jet streams: ER-2 data around the lower-stratospheric polar night vortex, Q. J. R. Meteorol. Soc., 130, pp. 2423-2444, June 2004

Brooks, S. D., D. Baumgardner, B. Gandrud, J. E. Dye, M. J. Northway, D. W. Fahey, T. P. Bui, O. B. Toon, and M. A. Tolbert (2003), Measurements of large stratospheric particles in the Arctic polar vortex, J. Geophys. Res., 108(D20), 4652, doi:10.1029/2002JD003278, (published Oct 2003)

Lee, S.-H., J. C. Wilson, D. Baumgardner, R. L. Herman, E. M. Weinstock, B. G. LaFleur, G. Kok, B. Anderson, P. Lawson, B. Baker, A. Strawa, J. V. Pittman, J. M. Reeves, T. P. Bui, New particle formation observed in the tropical/subtropical cirrus clouds, J. Geophys. Res., 109, D20209, doi:10.1029/2004JD005033 (2004)

Garrett T. J., A. J. Heymsfield, M. J. McGill, B. A. Ridley, D. G. Baumgardner, T. P. Bui, C. R. Webster (2004), Convective generation of cirrus near the tropopause, J. Geophys. Res., 109, D21203, doi:10.1029/2004JD004952.

Gao, R. S., P. J. Popp, D. W. Fahey, T. P. Marcy, R. L. Herman, E. M. Weinstock, D. G. Baumgardner, T. J. Garrett, K. H. Rosenlof, T. L. Thompson, P. T. Bui,B. A. Ridley, S. C. Wofsy, O. Toon, M. A. Tolbert, B. Karcher, Th. Peter, P. K. Hudson, A. J. Weinheimer, A. J. Heymsfield, Evidence that nitric acid increases relative humidity in low-temperature cirrus clouds, Science, 303, 516-620, January 2004.

Jost Hans-Jurg, K. Drdla, A. Stohl, L. Pfister, M. Loewenstein, J. P. Lopez, P. K. Hudson, D. M. Murphy, D. J. Cziczo, M. Fromm, T. P. Bui, J. Dean-Day, C. Gerbig, M. J. Mahoney, E. C. Richard, N. Spichtinger, J. Pittman, E. M. Weinstock, J. C. Wilson, and I. Xueref, In-situ observations of mid-latitude forest fire plumes deep in the stratosphere, Geophys. Res. Lett., 31, L11101, doi:10.1029/2003GL019253.

Popp, P. J., R. S. Gao, T. P. Marcy, D. W. Fahey, P.K. Hudson, T. L. Thompson, B. Karcher, B. A. Ridley, A. J. Weinheimer, D. J. Knapp, D.D. Montzka, D. Baumgardner, T. J. Garrett, E. M. Weinstock, J. B. Smith, D. S. Sayres, J. V. Pittman, S. Dhaniyala, T. P. Bui, and M. J. Mahoney, Nitric acid uptake on subtropical cirrus cloud particles, J. Geophys. Res., 109, D06302, 2003JD004255

McKinney, K. A., P.O. Wennberg, S. Dhaniyala, D. W. Fahey, M.J. Northway, K. F. Kuenzi, A. Kleinboehl, M. von Koenig, H. Bremer, H. Kuellmann, M.J. Mahoney, R. L. Herman, T. P. Bui, Trajectory studies of large HNO3-containing PSC particles in the Arctic: Evidence for the role of NAT, Geophys. Res. Lett., 2003GL018430

Drdla, K., B. W. Gandrud, D. Baumgardner, J. C. Wilson, T. P. Bui, D. Hurst, S. M. Schauffler, H. Jost, J. Greenblatt, and C. R. Webster, Evidence for the widespread presence of liquid-phase particles during the 1999-2000 Arctic winter, J. Geophys. Res., 108, 8318, 2003

Herman, R. L., K. Drdla, J. R. Spackman, D. F. Hurst, P. J. Popp, C. R.Webster, P. A. Romashkin, J. W.Elkins, E. M. Weinstock, B. W. Gandrud, G. C. Toon, M. R. Schoeberl, H. Jost, E. L. Atlas, and T. P. Bui, Hydration, dehydration, and the total hydrogen budget of the 1999/2000 winter Arctic stratosphere, J. Geophys. Res., 108, 8320, 2003

Burris, J., T. McGee, W. Hoegy, L. Lait, L. Twigg, G. Sumnicht, Wm. Heaps, C. Hostetler, T. Bui, R. Neuber and I.S. McDermid,Validation of Temperature Measurements from the Airborne Raman Ozone Temperature and Aerosol Lidar During SOLVE, J. Geophys. Res., 107, D20, 8286-8296, Oct 2002

Hanisco, T. F., J. B. Smith, R. M. Stimpfle, D. M. Wilmouth, J. G. Anderson, E. C. Richard, and T. P. Bui, In situ observations of HO2 and OH obtained on the NASA ER-2 in the high-ClO conditions of the 1999/2000 Arctic polar vortex, J. Geophys. Res., 107, D20, 8283, Oct 2002

Hanisco, T. F., J. B. Smith, R. M. Stimpfle, D. M. Wilmouth, K. K. Perkins, J. R. Spackman, J. G. Anderson, D. Baumgardner, B. Gandrud, C. R. Webster, S. Dhaniyala, L. A. McKinney, and T. P. Bui, Quantifying the rate of heterogeneous processing in the Arctic polar vortex with in situ observations of OH, J. Geophys. Res., 107, D20, 8278, Oct 2002

Tuck, A. F., S. J. Hovde, E. C. Richard, D. W. Fahey, R. S Gao, and T. P. Bui, A scaling Analysis of ER-2 data in the inner Arctic vortex during January – March 2000, J. Geophys. Res., 107, 8306, 2003

Danilin, M. Y., M. K. W. Ko, R. M. Bevilacqua, L. V. Lyjak, L. Froidevaux, M. L. Santee, J. M. Zawodny, K. W. Hoppel, E. C. Richard, J . R. Spackman, E. M. Weinstock, R. L. Herman, K. A. McKinney, P. O. Wennberg, F. L. Eisele, R. M. Stimpfle, C. J. Scott, J. W. Elkins, and T. P. Bui, Comparison of ER-2 aircraft and POAM III, MLS, and SAGE II satellite measurements during SOLVE using traditional correlative analysis and trajectory hunting technique, J. Geophys. Res., 107, 8315, 2002

Hanisco, T. F., J. B. Smith, R. M. Stimpfle, D. M. Wilmouth, K. K. Perkins, J. R. Spackman, J. G. Anderson, D. Baumgardner, B. Gandrud, C. R. Webster, S. Dhaniyaha, K. A. McKinney, and T. P. Bui, Quantifying the rate of heterogeneous processing in the Arctic polar vortex with in situ observations of OH, J. Geophys. Res., 107, D20, 8278, 2002

Hanisco, T. F., J. B. Smith, R. M. Stimpfle, D. M. Wilmouth, J. G. Anderson, E. C. Richard, T. P. Bui, In situ observations of HO2 and OH obtained on the NASA ER-2 in the high-ClO conditions of the 1999/2000 Arctic polar vortex, J. Geophys. Res., 107, D20, 8283, 2002

Gao, R. S., P. J. Popp, E. A. Ray, K. H. Rosenlof, M. J. Northway, D. W. Fahey, A. F. Tuck, C. R. Webster, D. F. Hurst, S. M. Schauffler, H. Jost, and T. P. Bui., The role of NOy as a diagnostic of small-scale mixing in a denitrified polar vortex, J. Geophys. Res., accepted June 22, 2002.

Weinstock, E. M., E. J. Hintsa, D. B. Kirk-Davidoff, J. G. Anderson, A. E. Andrews, R. L. Newman, C. R. Webster, M. Loewenstain, J. R. Podolske, and T. P. Bui, Constraints on the seasonal cycle of stratospheric water vapor using in situ measurements from the ER-2 and a CO photochemical clock, J. Geophys. Res., 106, 22707-22734, Oct 2001.

Northway, Megan J.; Popp, Peter J.; Gao, Ru-Shan; Fahey, David W.; Toon, G. C.; Bui, T. P., Relating inferred HNO3 flux values to the denitrification of the 1999–2000 Arctic vortex, Geophys. Res. Lett., 29, 10.1029/2002GL015000, August 2002

Salawitch, R. J.; Margitan, J. J.; Sen, B.; Toon, G. C.; Osterman, G. B.; Rex, M.; Elkins, J. W.; Ray, E. A.; Moore, F. L.; Hurst, D. F.; Romashkin, P. A.; Bevilacqua, R. M.; Hoppel, K. W.; Richard, E. C.; Bui, T. P., Chemical loss of ozone during the Arctic winter of 1999/2000: An analysis based on balloon-borne observations, J. Geophys. Res., 10.1029/2001JD000620, September 2002

Greenblatt, Jeffery B.; Jost, Hans-Jürg; Loewenstein, Max; Podolske, James R.; Bui, T. Paul; Hurst, Dale F.; Elkins, James W.; Herman, Robert L.; Webster, Christopher R.; Schauffler, Sue M.; Atlas, Elliot L.; Newman, Paul A.; Lait, Leslie R.; Müller, Melanie; Engel, Andreas; Schmidt, Ulrich, Defining the polar vortex edge from an N2O: potential temperature correlation, J. Geophys. Res., 10.1029/2001JD000575, September 2002

Drdla, K., B. W. Gandrud, D. Baumgardner, J. C. Wilson, T. P. Bui, D. Hurst, S. M. Schauffler, H. Jost, J. B. Greenblatt, and C. R. Webster. Evidence for the widespread presence of liquid-phase particles during the 1999-2000 Arctic Winter. J. Geophys. Res., 108(D5), doi: 10.1029/2001JD001127, 2002.

Greenblatt, J. B., H.-J. Jost, M. Loewenstein, J. R. Podolske, D. F. Hurst, J. W. Elkins, S. M. Schauffler, E. L. Atlas, R. L. Herman, C. R. Webster, T. P. Bui, F. L. Moore, E. A. Ray, S. Oltmans, H. Vömel, J.-F. Blavier, B. Sen, R. A. Stachnik, G. C. Toon, A. Engel, M. Müller, U. Schmidt, H. Bremer, R. B. Pierce, B.-M. Sinnhuber, M. Chipperfield, and F. Lefèvre. Tracer-based determination of vortex descent in the 1999-2000 Arctic winter. J. Geophys. Res., 107 (ND20), 8279, doi:10.1029/2001JD000937, 2002b.

Jost, H., M. Loewenstein, J. B. Greenblatt, J. R. Podolske, T. P. Bui, D. F. Hurst, J. W. Elkins, R. L. Herman, C. R. Webster, S. M. Schauffler, E. L. Atlas, P. A. Newman, L. R. Lait, and S. C. Wofsy. Mixing events revealed by anomalous tracer relationships in the Arctic vortex during winter 1999/2000. J. Geophys, Res., 107 (ND24), 4795, doi:10.1029/2002JD002380, 2002.

Fahey, D. W., R. S. Gao, K. S. Carslaw, J. Kettleborough, P. J. Popp, M. J. Northway, J. C. Holecek, S. C. Ciciora, R. J. McLaughlin, T. L. Thompson, R. H. Winkler, D. G. Baumgardner, B. Gandrud, P. O. Wennberg, S. Dhaniyala, K. McKinney, Th. Peter, R. J. Salawitch, T. P. Bui, J. W. Elkins, C. R. Webster, E. L. Atlas, H. Jost, J. C. Wilson, R. L. Herman, A. Kleinbohl, and M. von Konig, The detection of large HNO3- containing particles in the winter artic stratosphere, Science, 291, 1026-1031, 2001.

Newman, P. A., J. C. Wilson, M. N. Ross, C. A. Brock, P. J. Sheridan, M. R. Schoeberl, L. R. Lait, T. P. Bui, M. Loewenstein, and J. R. Podolske, Chance encounter with a stratospheric kerosene rocket plume from Russia over California, Geophys. Res. Lett., 28, 959-962, 2001.

Gao, R. S., L. A. Del Negro, W. H. Swartz, R. J. Salawitch, S. A. Lloyd, M. H. Proffitt, D. W. Fahey, S. G. Donnelly, J. A. Newman, R. M. Stimpfle, and T. P. Bui, JNO2 at high solar zenith angles in the lower stratosphere, Geophys. Res. Lett., 28, 2405-2408, 2001.

Gao, R. S., E. C. Richard, P. J. Popp, G. C. Toon, D. F. Hurst, P. A. Newman, J. C. Holecek, M. J. Northway, D. W. Fahey, M. Y. Danilin, B. Sen, K. Ailin, P. A. Romashkin, J. W. Elkins, C. R. Webster, S. M. Schauffler, J. B. Greenblatt, C. T. McElroy, L. R. Lait, T. P. Bui, D. Baumgardner, Observational evidence for the role of denitrification in Arctic stratospheric ozone loss, Geophys. Res. Lett., 28, 2879- 2882, 2001.

Popp, P. J., M. J. Northway, J. C. Holecek, R. S. Gao, D. W. Fahey, J. W. Elkins, D. F. Hurst, P. A. Romashkin, G. C. Toon, B. Sen, S. M. Schauffler, R. J. Salawitch, C. R. Webster, R. L. Herman, H. Jost, T. P. Bui, P. A. Newman, and L. R. Lait, Severe and Extensive Denitrification in the 1999-2000 Arctic Winter Stratosphere, Geophys. Res. Lett., 28, 2875-2878, 2001.

Voss, P. B., R. M. Stimpfle, R. C. Cohen, T. F. Hanisco, G. P. Bonne, K. K. Perkins, E. J. Lanzendorf, J. G. Anderson, R. J. Salawitch, C. R. Webster, D. C. Scott, R. D. May, P. O. Wennberg, P. A. Newman, L. R. Lait, J. W. Elkins, and T. P. Bui, Inorganic chlorine partitioning in the summer lower stratosphere: Modeled and measured [ClONO2]/[HCl] during POLARIS, Geophys. Res. Lett., 106, 1713-1732, 2001.

Lanzendorf, E. J., T. F. Hanisco, P. O. Wennberg, R. C. Cohen, R. M. Stimpfle, J. G. Anderson, R. S. Gao, J. J. Margitan, T. P. Bui, Establishing the dependence of [HO2]/[OH] on temperature, halogen loading, O3, and Nox based on in situ measurements from the NASA ER-2, J. Phys. Chem. A, 105, 1535-1542, 2001.

Perkins, K. K., T. F. Hanisco, R. C. Cohen, L. C. Koch, R. M. Stimpfle, P. B. Voss, G. P. Bonne, E. J. Lanzendorf, J. G. Anderson, P. O. Wennberg, R. S. Gao, L. A. Del Negro, R. J. Salawitch, C. T. McElroy, E. J. Hintsa, M. Loewenstein, T. P. Bui, The Nox- HNO3 System in the lower stratosphere: Insights from in situ measurements and implications of the JHNO3-[OH] relationship, J. Phys. Chem. A, 105, 1521-1534, 2001.

Durden, S. L., Z. S. Haddad, and T. P. Bui, Correctin of doppler radar for aircraft motion using surface measurements and recursive least-squares estimation, J ATMOS OCEAN TECHNOL, 16: (12) 2026-2029 DEC 1999

Profitt, M. H., K. Aikin, A. F. Tuck, M. Loewenstein, T. P. Bui, J. J. Margitan, C. R. Webster, G. C. Toon, and J. W. Elkins, Seasonally Averaged Ozone in the Northern Hemisphere Lower Stratosphere Using a Conserved Tracer as a Reference, submitted to JGR on 5/31/2000

Andrews, AE; Boering, KA; Daube, BC; Wofsy, SC; Hintsa, EJ; Weinstock, EM; Bui, TP, Empirical age spectra for the lower tropical stratosphere from in situ observations of CO2: Implications for stratospheric transport, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26581-26595 NOV 20 1999

Rex, M; Salawitch, RJ; Toon, GC; Sen, B; Margitan, JJ; Osterman, GB; Blavier, JF; Gao, RS; Donnelly, S; Keim, E; Neuman, J; Fahey, DW; Webster, CR; Scott, DC; Herman, RL; May, RD; Moyer, EJ; Gunson, MR; Irion, FW; Chang, AY; Rinsland, CP; Bui, TP, Subsidence, mixing, and denitrification of Arctic polar vortex air measured During POLARIS, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26611-26623 NOV 20 1999

Flocke, F; Herman, RL; Salawitch, RJ; Atlas, E; Webster, CR; Schauffler, SM; Lueb, RA; May, RD; Moyer, EJ; Rosenlof, KH; Scott, DC; Blake, DR; Bui, TP, An examination of chemistry and transport processes in the tropical lower stratosphere using observations of long-lived and short-lived compounds obtained during STRAT and POLARIS, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26625-26642 NOV 20 1999

Del Negro, LA; Fahey, DW; Gao, RS; Donnelly, SG; Keim, ER; Neuman, JA; Cohen, RC; Perkins, KK; Koch, LC; Salawitch, RJ; Lloyd, SA; Proffitt, MH; Margitan, JJ; Stimpfle, RM; Bonne, GP; Voss, PB; Wennberg, PO; McElroy, CT; Swartz, WH; Kusterer, TL; Anderson, DE; Lait, LR; Bui, TP, Comparison of modeled and observed values of NO2 and JNO(2) during the Photochemistry of Ozone Loss in the Arctic Region in Summer (POLARIS) mission, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26687-26703 NOV 20 1999

Stimpfle, RM; Cohen, RC; Bonne, GP; Voss, PB; Perkins, KK; Koch, LC; Anderson, JG; Salawitch, RJ; Lloyd, SA; Gao, RS; Del Negro, LA; Keim, ER; Bui, TP, The coupling of ClONO2, ClO, and NO2 in the lower stratosphere from in situ observations using the NASA ER-2 aircraft, JOURNAL OF GEOPHYSICAL RESEARCHATMOSPHERES, 104: (D21) 26705-26714 NOV 20 1999

Strawa, AW; Drdla, K; Ferry, GV; Verma, S; Pueschel, RF; Yasuda, M; Salawitch, RJ; Gao, RS; Howard, SD; Bui, PT; Loewenstein, M; Elkins, JW; Perkins, KK; Cohen, R, Carbonaceous aerosol (Soot) measured in the lower stratosphere during POLARIS and its role in stratospheric photochemistry, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26753-26766 NOV 20 1999

Toon, GC; Blavier, JF; Sen, B; Margitan, JJ; Webster, CR; May, RD; Fahey, D; Gao, R; Del Negro, L; Proffitt, M; Elkins, J; Romashkin, PA; Hurst, DF; Oltmans, S; Atlas, E; Schauffler, S; Flocke, F; Bui, TP; Stimpfle, RM; Bonne, GP; Voss, PB; Cohen, RC, Comparison of MkIV balloon and ER-2 aircraft measurements of atmospheric trace gases, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 104: (D21) 26779-26790 NOV 20 1999

Herman, R. L., Webster, C. R., May, R. D., Scott, D. C., Hu, H., Moyer, E. J. Wennberg, P. O., Hanisco, T. F., Lanzendorf, E. J., Salawitch, R. J., Yung, Y. L., Margitan, J. J., Bui, T. P. , Measurements of CO in the upper troposphere and lower stratosphere, Chemosphere, Oxford, UK, 1(1-3): 173-183, September 1999. Refs., figs. M.G.A. (2000), 51:4-165

Fahey D. W.; Gao RS; DelNegro LA; Keim ER; Kawa SR; Salawitch RJ; Wennberg PO; Hanisco TF; Lanzendorf EJ; Perkins KK; Lloyd SA; Swartz WH; Proffitt MH; Margitan JJ; Wilson JC; Stimpfle RM; Cohen RC; McElroy CT; Webster CR; Loewenstein M; Elkins JW; Bui TP, Ozone destruction and production rates between spring and autumn in the Arctic stratosphere, GEOPHYSICAL RESEARCH LETTERS , 2000 , Volume: 27 , Number: 17 (SEP 1) , Page: 2605-2608 , September 01 2000

Ferry, G. V., R. F. Pueschel, A. W. Strawa, Y. Kondo, S. D. Howard, S. Verma, M. J. Mahoney, T. P. Bui, J. R. Hannan, H. E. Fueldberg, Effects of aircraft on aerosol abundance in the upper troposphere , Geophys. Res. Lett., 26, 2399-2402, 1999

Gao, R. S., D. W. Fahey, L. A. Del Negro, S. G. Donnelly, E. R. Keim, J. A. Neuman, E. Teverovskaia, P. O. Wennberg, T. F. Hanisco, E. J. Lanzendorf, M. H. Proffitt, J. J. Margitan, J. C. Wilson, J. W. Elkins, R. M. Stimpfle, R. C. Cohen, C. T. McElroy, T. P. Bui, R. J. Salawitch, S. S. Brown, A. R. Ravishankara, R. W. Portmann, M. K. W. Ko, D. K. Weisenstein, and P. A. Newman, A comparison of observations and model simulations of NOx/NOy in the lower stratosphere, Geophys. Res. Lett., 26, 1153-1156, 1999

Keim, E. R., S. A. McKeen, R. S. Gao, S. G. Donnelly, R. C. Wamsley, L. A. DelNegro, D. W. Fahey, T. F. Hanisco, E. J. Lanzendorf, M. H. Proffitt, J. J. Margitan, E. J. Hintsa, L. Jaegle, C. R. Webster, R. D. May, D. C. Scott, R. J. Salawitch, J. C. Wilson, C. T. McElroy, E. L. Atlas, F. Frocke, and T. P. Bui, NOy partitioning from measurements of nitrogenand hydrogen radicals in the upper troposphere, Geophys. Res. Lett., 26, 51-54, 1999

Cho, John Y. N., R. E. Newell, T. P. Bui, E. V. Browell, M. A. Fenn, M. J. Mahoney, G. L. Gregory, G. W. Sachse, S. A. Vay, T. L. Kucsera, and A. M. Thompson, Observations of convective and dynamical instabilities in tropopause folds and their contribution to stratosphere-troposphere exchange, J. Geophys. Res., 104, 21549- 21568, 1999

Rex, M., R.J. Salawitch, G.C. Toon, B. Sen, J.J. Margitan, G.B. Osterman, J.-F. Blavier, R.S. Gao, S. Donelly, E. Keim, J. Neuman, D.W. Fahey, C.R. Webster, D.C. Scott, R.L. Herman, R.D. May, E.J. Moyer, M.R. Gunson, F.W. Irion, A.Y. Chang, C.P. Rinsland, and T.P. Bui, Subsidence, Mixing and Denitrification of Arctic Polar Vortex Air measured during POLARIS, J. Geophys. Res., in press, 1999

Del Negro, L. A. , D. W. Fahey, R. S. Gao, S. G. Donnelly, E. R. Keim, J. A. Neuman, R. C. Cohen, K. K. Perkins, L. C. Koch, R. J. Salawich, S. A. Lloyd, M. H. Proffitt, J. Margitan, R. M. Stimpfle, G. P. Bonne, P. B. Voss, T. F. Hanisco, E. J. Lanzendorf, P. O. Wennberg, C. T. McElroy, P. A. Newman, L. R. Lait, and T. P. Bui, Comparison of modeled and observed values of NO2 and JNO2 during the POLARIS mission, J. Geophys. Res., 104, 26687-26703, 1999

Chan, K. R., J. Dean-Day, S. W. Bowen, and T. P. Bui, Turbulence measurements by the DC-8 meteorological measurement system, Geophys. Res. Lett., 25, 1355-1358, 1998 Chan, K. R., L. Pfister, T. P. Bui , S. W. Bowen, J. Dean-Day, B. L. Gary, D. W. Fahey, K. K. Kelly, C. R. Webster and R. D. May, A case study of the mountain lee wave event of January 6, 1992, Geophys. Res. Lett., 20, 2551-2554, 1993

Pfister, L., K. R. Chan, T. P. Bui, S. Bowen, M. Legg, B. Gary, K. Kelly, M. Profitt, and W. Starr, Gravity Waves Generated by a Tropical Cyclone During the STEP Tropical Field Program: A Case Study, J. Geophys. Res., 98, 8611-8636, 1993