Search

Your search keyword '"Jakoubek R"' showing total 30 results
Start Over Author "Jakoubek R"
30 results on '"Jakoubek R"'

3. Effect of petrochemical industrial emissions of reactive alkenes and NOx on tropospheric ozone formation in Houston, Texas

Author

Ryerson, T. B., Ryerson, T. B., Trainer, M., Angevine, W. M., Brock, C. A., Dissly, R. W., Fehsenfeld, F. C., Frost, G. J., Goldan, P. D., Holloway, J. S., Hübler, G., Jakoubek, R. O., Kuster, W. C., Neuman, J. A., Nicks, D. K., Parrish, D. D., Roberts, J. M., Sueper, D. T., Atlas, E. L., Donnelly, S. G., Flocke, F., Fried, A., Potter, W. T., Schauffler, S., Stroud, V., Weinheimer, A. J., Wert, B. P., Wiedinmyer, C., Alvarez, R. J., Banta, R. M., Darby, L. S., Senff, C. J., Ryerson, T. B., Ryerson, T. B., Trainer, M., Angevine, W. M., Brock, C. A., Dissly, R. W., Fehsenfeld, F. C., Frost, G. J., Goldan, P. D., Holloway, J. S., Hübler, G., Jakoubek, R. O., Kuster, W. C., Neuman, J. A., Nicks, D. K., Parrish, D. D., Roberts, J. M., Sueper, D. T., Atlas, E. L., Donnelly, S. G., Flocke, F., Fried, A., Potter, W. T., Schauffler, S., Stroud, V., Weinheimer, A. J., Wert, B. P., Wiedinmyer, C., Alvarez, R. J., Banta, R. M., Darby, L. S., and Senff, C. J.

Abstract

Petrochemical industrial facilities can emit large amounts of highly reactive hydrocarbons and NOx to the atmosphere; in the summertime, such colocated emissions are shown to consistently result in rapid and efficient ozone (O3) formation downwind. Airborne measurements show initial hydrocarbon reactivity in petrochemical source plumes in the Houston, TX, metropolitan area is primarily due to routine emissions of the alkenes propene and ethene. Reported emissions of these highly reactive compounds are substantially lower than emissions inferred from measurements in the plumes from these sources. Net O3 formation rates and yields per NOx molecule oxidized in these petrochemical industrial source plumes are substantially higher than rates and yields observed in urban or rural power plant plumes. These observations suggest that reductions in reactive alkene emissions from petrochemical industrial sources are required to effectively address the most extreme O3 exceedences in the Houston metropolitan area.

Published
2003

4. Visible and near-ultraviolet spectroscopy at Thule AFB (76.5 N) from January 28 - February 15, 1988

Author

Mount, G. H, Sanders, R. W, Jakoubek, R. O, Schmeltekopf, A. L, and Solomon, S

Subjects
Environment Pollution
Abstract

Near-ultraviolet and visible spectrographs identical to those employed at McMurdo Station, Antarctica (77.8 S) during the austral spring seasons of 1986 and 1987 were used to study the stratosphere above Thule, Greenland (76.5 N) during early spring, 1988. Observations were carried out both at night using the direct moon as a light source, and during the day by collecting the scattered light from the zenith sky when solar zenith angles were less than about 94.5 degrees. Excellent meteorological conditions prevailed in the troposphere and stratosphere at Thule. Surface weather was extremely clear over most of the period, facilitating measurements of the direct light from the moon. The lower stratospheric arctic polar vortex was located very near Thule throughout the observing period, and temperature at the 30 mbar level were typically below -80 C above Thule, according to the National Meteorological Center daily analyses. Thus conditions were favorable for polar stratospheric cloud formation above Thule. Total column ozone abundances were about 350 to 400 Dobson units, and did not suggest a clear temporal trend over the observing period. Stratospheric nitrogen dioxide measurements were complicated by the presence of a large component of tropospheric pollution on many occasions. Stratospheric nitrogen dioxide could be identified on most days using the absorption in the scattered light from the zenith sky, which greatly enhances the stratospheric airmass while suppressing the tropospheric contribution. These measurements suggest that the total vertical column abundance of nitrogen dioxide present over Thule in February was extremely low, sometimes as low as 3 x 10 to the 14th per sq cm. The abundance of nitrogen dioxide increased systemically from about 3 x 10 to the 14th in late January to 1.0 x 10 to the 15th per sq cm in mid-February, perhaps because of photolysis of N2O5 in the upper part of the stratosphere, near 25 to 35 km.

Published
1988

5. Near UV atmospheric absorption measurements from the DC-8 aircraft during the 1987 airborne Antarctic ozone experiment

Author

Wahner, A, Jakoubek, R. O, Ravishankara, A. R, Mount, G. H, and Schmeltekopf, A. L

Subjects
Environment Pollution
Abstract

During the Airborne Antarctic Ozone Experiment from 28 August to 30 September 1987 near UV zenith scattered sky measurements were made over Antarctic from the NASA DC-8 aircraft using a one third m spectrograph equipped with a diode-array detector. Scattered sky light data in the wavelength range 348 nm to 388 nm was spectrally analyzed for O3, NO2, OClO, and BrO column abundances. Slant column abudances of O3, NO2, OClO and BrO were determined, using a computer algorithm of non-linear and linear least square correlation of Antarctic scattered sky spectra to laboratory absorption cross section data. Using measured vertical electrochemical sonde ozone profiles from Palmer, Halley Bay, and the South Pole Stations the slant columns of O3 were converted into vertical column abundances. The vertical column amounts of NO2, OClO, and BrO were derived using vertical profiles calculated by a chemical model appropriate for Antarctica. NO2 vertical column abundances show steep latitudinal decrease with increasing latitude for all 13 flights carried out during the mission. In the regions where NO2 abudances are low, OClO and BrO were observed. The spatial and temporal vertical column abundances of these species are discussed in the context of the chemistry and dynamics in the antarctic polar vortex during the austral spring.

Published
1988

8. Comparison of daytime and nighttime oxidation of biogenic and anthropogenic VOCs along the New England coast in summer during New England Air Quality Study 2002

Author

Warneke, C., primary, de Gouw, J. A., additional, Goldan, P. D., additional, Kuster, W. C., additional, Williams, E. J., additional, Lerner, B. M., additional, Jakoubek, R., additional, Brown, S. S., additional, Stark, H., additional, Aldener, M., additional, Ravishankara, A. R., additional, Roberts, J. M., additional, Marchewka, M., additional, Bertman, S., additional, Sueper, D. T., additional, McKeen, S. A., additional, Meagher, J. F., additional, and Fehsenfeld, F. C., additional

Published
2004
Full Text
View/download PDF

9. Nighttime removal of NOxin the summer marine boundary layer

Author

Brown, S. S., primary, Dibb, J. E., additional, Stark, H., additional, Aldener, M., additional, Vozella, M., additional, Whitlow, S., additional, Williams, E. J., additional, Lerner, B. M., additional, Jakoubek, R., additional, Middlebrook, A. M., additional, DeGouw, J. A., additional, Warneke, C., additional, Goldan, P. D., additional, Kuster, W. C., additional, Angevine, W. M., additional, Sueper, D. T., additional, Quinn, P. K., additional, Bates, T. S., additional, Meagher, J. F., additional, Fehsenfeld, F. C., additional, and Ravishankara, A. R., additional

Published
2004
Full Text
View/download PDF

10. Effect of petrochemical industrial emissions of reactive alkenes and NOx on tropospheric ozone formation in Houston, Texas

Author

Ryerson, T. B., primary, Trainer, M., additional, Angevine, W. M., additional, Brock, C. A., additional, Dissly, R. W., additional, Fehsenfeld, F. C., additional, Frost, G. J., additional, Goldan, P. D., additional, Holloway, J. S., additional, Hübler, G., additional, Jakoubek, R. O., additional, Kuster, W. C., additional, Neuman, J. A., additional, Nicks, D. K., additional, Parrish, D. D., additional, Roberts, J. M., additional, Sueper, D. T., additional, Atlas, E. L., additional, Donnelly, S. G., additional, Flocke, F., additional, Fried, A., additional, Potter, W. T., additional, Schauffler, S., additional, Stroud, V., additional, Weinheimer, A. J., additional, Wert, B. P., additional, Wiedinmyer, C., additional, Alvarez, R. J., additional, Banta, R. M., additional, Darby, L. S., additional, and Senff, C. J., additional

Published
2003
Full Text
View/download PDF

11. Fast‐response airborne in situ measurements of HNO3 during the Texas 2000 Air Quality Study

Author

Neuman, J. A., primary, Huey, L. G., additional, Dissly, R. W., additional, Fehsenfeld, F. C., additional, Flocke, F., additional, Holecek, J. C., additional, Holloway, J. S., additional, Hübler, G., additional, Jakoubek, R., additional, Nicks, D. K., additional, Parrish, D. D., additional, Ryerson, T. B., additional, Sueper, D. T., additional, and Weinheimer, A. J., additional

Published
2002
Full Text
View/download PDF

12. Comparisons of box model calculations and measurements of formaldehyde from the 1997 North Atlantic Regional Experiment

Author

Frost, G. J., primary, Fried, A., additional, Lee, Y.‐N., additional, Wert, B., additional, Henry, B., additional, Drummond, J. R., additional, Evans, M. J., additional, Fehsenfeld, F. C., additional, Goldan, P. D., additional, Holloway, J. S., additional, Hübler, G., additional, Jakoubek, R., additional, Jobson, B. T., additional, Knapp, K., additional, Kuster, W. C., additional, Roberts, J., additional, Rudolph, J., additional, Ryerson, T. B., additional, Stohl, A., additional, Stroud, C., additional, Sueper, D. T., additional, Trainer, M., additional, and Williams, J., additional

Published
2002
Full Text
View/download PDF

17. Nighttime removal of NOx in the summer marine boundary layer.

Author

Brown, S. S., Dibb, J. E., Stark, H., Aldener, M., Vozella, M., Whitlow, S., Williams, E. J., Lerner, B. M., Jakoubek, R., Middlebrook, A. M., DeGouw, J. A., Warneke, C., Goldan, P. D., Kuster, W. C., Angevine, W. M., Sueper, D. T., Quinn, P. K., Bates, T. S., Meagher, J. F., and Fehsenfeld, F. C.

Published
2004
Full Text
View/download PDF

21. Intercomparison of ozone measurements over Antarctica.

Author

Margitan, J. J., Brothers, G. A., Browell, E. V., Cariolle, D., Coffey, M. T., Farman, J. C., Farmer, C. B., Gregory, G. L., Harder, J. W., Hofmann, D. J., Hypes, W., Ismail, S., Jakoubek, R. O., Komhyr, W., Kooi, S., Krueger, A. J., Larsen, J. C., Mankin, W., McCormick, M. P., and Mount, G. H.

Published
1989
Full Text
View/download PDF

26. The peculiar object HD 44179 /'The red rectangle'/

Author

Cohen, M., primary, Anderson, C. M., additional, Cowley, A., additional, Coyne, G. V., additional, Fawley, W., additional, Gull, T. R., additional, Harlan, E. A., additional, Herbig, G. H., additional, Holden, F., additional, Hudson, H. S., additional, Jakoubek, R. O., additional, Johnson, H. M., additional, Merrill, K. M., additional, Schiffer, F. H., additional, Soifer, B. T., additional, and Zuckerman, B., additional

Published
1975
Full Text
View/download PDF

30. Calibration and evaluation of nitric acid and ammonia permeation tubes by UV optical absorption.

Author

Neuman JA, Ryerson TB, Huey LG, Jakoubek R, Nowak JB, Simons C, and Fehsenfeld FC

Subjects
Air Movements, Calibration, Optics and Photonics, Permeability, Sensitivity and Specificity, Ultraviolet Rays, Air Pollutants analysis, Ammonia analysis, Nitric Acid analysis
Abstract

An ultraviolet (UV) optical absorption system has been developed for absolute calibrations of nitric acid (HNO3) and ammonia (NH3) permeation tube emission rates. Using this technique, dilute mixtures containing NH3 or HNO3, both of which interact strongly with many surfaces, are accurately measured at levels below a part per million by volume. This compact and portable instrument operates continuously and autonomously to rapidly (<1 h) quantify the emission of trace gases from permeation devices that are commonly used to calibrate air-monitoring instruments. The output from several HNO3 and NH3 permeation tubes, with emission rates that ranged between 13 and 150 ng/min, was examined as a function of temperature, pressure, and carrier gas flow. Absorptions of 0.015% can be detected which allows a precision (3sigma) of +/-1 ng/min for the HNO3 and NH3 permeation tubes studied here. The accuracy of the measurements, which relies on published UV absorption cross sections, is estimated to be +/-10%. Measurements of permeation tube emission rates using ion chromatography analysis are made to further assess measurement accuracy. The output from the HNO3 and NH3 permeation tubes examined here was stable over the study period, which ranged between 3 months and 1 year for each permeation tube.

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results