Zobrazeno 1 - 10
of 54
pro vyhledávání: '"B. W. Gandrud"'
Autor:
Owen B. Toon, Rudolf F. Pueschel, B. W. Gandrud, Joëlle Ovarlez, Stephanie A. Vay, Cynthia H. Twohy, Randy D. May, Eric J. Jensen, T. P. Bui, Ulrich Schumann
Publikováno v:
Journal of Geophysical Research: Atmospheres. 106:17253-17266
In situ measurements of water vapor and temperature from recent aircraft campaigns have provided evidence that the upper troposphere is frequently supersaturated with respect to ice. The peak relative humidities with respect to ice (RHI) occasionally
Autor:
B. W. Gandrud, Brian A. Ridley, F. E. Grahek, Teresa Campos, James Walega, Eric J. Jensen, Darrel Baumgardner, Andrew J. Weinheimer, Cynthia H. Twohy
Publikováno v:
Geophysical Research Letters. 25:1725-1728
In a flight through a wave cloud during SUCCESS on 2 May 1996, simultaneous forward- and aft-facing NOy inlets were used to infer the amount of condensed-phase NOy present on ice particles that were up to a few minutes old. Condensed-phase amounts we
Autor:
James R. Podolske, Bruce E. Anderson, Cynthia H. Twohy, Steven L. Baughcum, G. W. Sachse, Stephanie A. Vay, K. R. Chan, H. A. Wallio, B. W. Gandrud, J. E. Collins
Publikováno v:
Geophysical Research Letters. 25:1717-1720
We report the first measurements of CO, CH4, N2O, CO2, and H2O(g) in the exhaust trails of T-39, B-757, and DC-8 aircraft at cruise conditions. Emission indices (EI) derived from these in-situ measurements are presented. Results are in agreement with
Autor:
Eric J. Jensen, K. R. Chan, B. L. Gary, B. W. Gandrud, Andrew J. Heymsfield, Bruce E. Anderson, G. W. Sachse, Azadeh Tabazadeh, Owen B. Toon, Steven M. Aulenbach, C. W. Twohy, John Hallett
Publikováno v:
Geophysical Research Letters. 25:1363-1366
We have compared in situ measurements near the leading-edges of wave-clouds observed during the SUCCESS experiment with numerical simulations. Observations of high supersaturations with respect to ice (>50%) near the leading edge of a very cold wave
Autor:
Andrew J. Heymsfield, Bruce E. Anderson, Owen B. Toon, K. Roland Chan, Eric J. Jensen, Richard C. Miake-Lye, Cynthia H. Twohy, Glen W. Sachse, Stefan Kinne, B. W. Gandrud
Publikováno v:
Journal of Geophysical Research: Atmospheres. 103:3929-3936
The ambient temperatures and humidities required for contrail for- mation and persistence are determined from in situ measurements during the Subsonic Aircraft: Contrail and Cloud Effects Special Study (SUCCESS) exper- iment. Ambient temperatures and
Autor:
Douglas R. Worsnop, Ru-Shan Gao, James C. Wilson, David W. Fahey, J. R. Podolske, Christopher R. Webster, K. R. Chan, Max Loewenstein, Margaret A. Tolbert, E. L. Woodbridge, Darrel Baumgardner, L. A. Del Negro, R. C. Wamsley, Azadeh Tabazadeh, B. W. Gandrud, R. D. May, Haflidi Jonsson, K. K. Kelly, E. R. Keim, S. G. Donnelly, James E. Dye
Publikováno v:
Journal of Geophysical Research: Atmospheres. 102:13255-13282
Airborne measurements of total reactive nitrogen (NOy) and polar stratospheric cloud (PSC) aerosol particles were made in the Antarctic (68°S) as part of the NASA Airborne Southern Hemisphere Ozone Experiment/Measurements for Assessing the Effects o
Autor:
L. A. Delnegro, James R. Podolske, James E. Dye, B. W. Gandrud, Azadeh Tabazadeh, K. S. Barr, Darrel Baumgardner, Haflidi Jonsson, David W. Fahey, K. R. Chan, Max Loewenstein, K. Drdla, James C. Wilson
Publikováno v:
Geophysical Research Letters. 23:1913-1916
Measured particle volumes in a type I polar stratospheric cloud near the Antarctic polar vortex during ASHOE/MAESA show that the onset of the cloud occurred near 193 K, 3 degrees colder than nitric acid trihydrate (NAT) saturation. The onset temperat
Publikováno v:
Geophysical Research Letters. 23:749-752
A new instrument for simultaneously measuring aerosol diameter from 0.4–10 µm and the refractive index between 1.30–1.60 has recently been flown on the NASA ER-2 aircraft during a stratospheric measurement campaign. Average stratospheric refract
Autor:
G. Hübler, Estelle P. Condon, D. O'Hara, Gerald L. Gregory, Douglas D. Davis, Louis J. Salas, B. W. Gandrud, J. F. Vedder, John D. Bradshaw, Sherwin M. Beck, D. L. Albritton, J. D. Shetter, Scott T. Sandholm, Mary Anne Carroll, Barry J. Huebert, Hanwant B. Singh, Peter J. LeBel, Brian A. Ridley, Michael O. Rodgers
Publikováno v:
Journal of Geophysical Research: Atmospheres. 95:10163-10178
Results are reported from airborne PAN measurements obtained at altitudes 0-6 km over the continental U.S. and the eastern Pacific during the NASA Global Tropospheric Experiment Chemical Instrumentation Test and Evaluation 2 (CITE 2) in summer 1986.
Autor:
J. D. Shetter, Hanwant B. Singh, James M. Hoell, Gerald L. Gregory, Brian A. Ridley, Louis J. Salas, B. W. Gandrud
Publikováno v:
Journal of Geophysical Research: Atmospheres. 95:10077-10087
Results are reported on the performance of the NASA and NCAR PAN measurement instruments during the NASA Global Tropospheric Experiment Chemical Instrumentation Test and Evaluation 2 (CITE 2) mission in August-September 1986. Both PAN instruments emp