Search Results - "C. T. McElroy"

Performance of the ground-based total ozone network assessed using satellite data by Fioletov, V. E., Labow, G., Evans, R., Hare, E. W., Köhler, U., McElroy, C. T., Miyagawa, K., Redondas, A., Savastiouk, V., Shalamyansky, A. M., Staehelin, J., Vanicek, K., Weber, M.

“…Dobson and Brewer spectrophotometer and filter ozonometer data available from the World Ozone and Ultraviolet Data Centre (WOUDC) were compared with satellite…”
Get full text

Compensating for the Effects of Stray Light in Single-Monochromator Brewer Spectrophotometer Ozone Retrieval by Karppinen, Tomi, Redondas, Alberto, García, Rosa D., Lakkala, Kaisa, McElroy, C. T., Kyrö, Esko

“…Spectrometers are designed to isolate particular wavebands and suppress light from wavelengths outside the band of interest. However, a small amount of…”
Get full text

Evidence for Large Upward Trends of Ultraviolet-B Radiation Linked to Ozone Depletion by Kerr, J. B., McElroy, C. T.

“…Spectral measurements of ultraviolet-B radiation made at Toronto since 1989 indicate that the intensity of light at wavelengths near 300 nanometers has…”
Get full text

The Brewer reference triad by Fioletov, V. E., Kerr, J. B., McElroy, C. T., Wardle, D. I., Savastiouk, V., Grajnar, T. S.

“…It has been more than 20 years since the Brewer reference triad was established by Environment Canada at Toronto. The triad serves as a reference for traveling…”
Get full text

Improved retrieval of nitrogen dioxide (NO 2 ) column densities by means of MKIV Brewer spectrophotometers by Diémoz, H, Siani, A. M, Redondas, A, Savastiouk, V, McElroy, C. T, Navarro-Comas, M, Hase, F

“…A new algorithm to retrieve nitrogen dioxide (NO2) column densities using MKIV ("Mark IV") Brewer spectrophotometers is described. The method includes several…”
Get full text

Evidence for bromine monoxide in the free troposphere during the Arctic polar sunrise by McElroy, C. T, McLinden, C. A, McConnell, J. C

“…During the Arctic polar springtime, dramatic ozone losses occur not only in the stratosphere but also in the underlying troposphere. These tropospheric ozone…”
Get full text

Quantifying Arctic ozone loss during the 2004–2005 winter using satellite observations and a chemical transport model by Singleton, C. S., Randall, C. E., Harvey, V. L., Chipperfield, M. P., Feng, W., Manney, G. L., Froidevaux, L., Boone, C. D., Bernath, P. F., Walker, K. A., McElroy, C. T., Hoppel, K. W.

“…During the last decade, much attention has been placed on quantifying and modeling Arctic stratospheric O3 loss. At issue in particular is the reliability of…”
Get full text

Year-round retrievals of trace gases in the Arctic using the Extended-range Atmospheric Emitted Radiance Interferometer by Mariani, Z, Strong, K, Palm, M, Lindenmaier, R, Adams, C, Zhao, X, Savastiouk, V, McElroy, C. T, Goutail, F, Drummond, J. R

“…The Extended-range Atmospheric Emitted Radiance Interferometer (E-AERI) was installed at the Polar Environment Atmospheric Research Laboratory (PEARL) at…”
Get full text

High vertical resolution water vapour profiles in the upper troposphere and lower stratosphere retrieved from MAESTRO solar occultation spectra by Sioris, C.E., Zou, J., McElroy, C.T., McLinden, C.A., Vömel, H.

“…An algorithm has been developed that retrieves water vapour profiles in the upper troposphere and lower stratosphere from optical depth spectra obtained by the…”
Get full text

Hydrogen radicals, nitrogen radicals, and the production of O3 in the upper troposphere by Wennberg, PO, Hanisco, TF, Jaegle, L, Jacob, DJ, Hintsa, EJ, Lanzendorf, EJ, Anderson, JG, Gao, R, Keim, ER, Donnelly, SG, Negro, LAD, Fahey, DW, McKeen, SA, Salawitch, RJ, Webster, CR, May, RD, Herman, RL, Proffitt, MH, Margitan, JJ, Atlas, EL, Schauffler, SM, Flocke, F, McElroy, CT, Bui, TP

“…The concentrations of the hydrogen radicals OH and HO2 in the middle and upper troposphere were measured simultaneously with those of NO, O3, CO, H2O, CH4,…”
Get full text

Introduction to the Special Issue of Atmosphere-Ocean-Proceedings of the Twenty-Second QOS by McElroy, C T

“…The twenty-second Quadrennial Ozone Symposium (QOS) was held in Toronto in August 2012, a year that marked a number of anniversaries of events related to the…”
Get full text

Validation of ACE and OSIRIS ozone and NO2 measurements using ground-based instruments at 80? N by Adams, C, Strong, K, Batchelor, R L, Bernath, P F, Brohede, S, Boone, C, Degenstein, D, Daffer, W H, Drummond, J R, Fogal, P F, Farahani, E, Fayt, C, Fraser, A, Goutail, F, Hendrick, F, Kolonjari, F, Lindenmaier, R, Manney, G, McElroy, C T, McLinden, C A, Mendonca, J, Park, J.-H, Pavlovic, B, Pazmino, A, Roth, C, Savastiouk, V, Walker, K A, Weaver, D, Zhao, X

“…The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since…”
Get full text

Summertime stratospheric processes at northern mid-latitudes: comparisons between MANTRA balloon measurements and the Canadian Middle Atmosphere Model by Melo, S. M. L., Blatherwick, R., Davies, J., Fogal, P., de Grandpré, J., McConnell, J., McElroy, C. T., McLandress, C., Murcray, F. J., Olson, J. R., Semeniuk, K., Shepherd, T. G., Strong, K., Tarasick, D., Williams-Rioux, B. J.

“…In this paper we report on a study conducted using the Middle Atmospheric Nitrogen TRend Assessment (MANTRA) balloon measurements of stratospheric constituents…”
Get full text

Observed OH and HO2 in the upper troposphere suggest a major source from convective injection of peroxides by Jaeglé, L., Jacob, D. J., Wennberg, P. O., Spivakovsky, C. M., Hanisco, T. F., Lanzendorf, E. J., Hintsa, E. J., Fahey, D. W., Keim, E. R., Proffitt, M. H., Atlas, E. L., Flocke, F., Schauffler, S., McElroy, C. T., Midwinter, C., Pfister, L., Wilson, J. C.

“…ER‐2 aircraft observations of OH and HO2 concentrations in the upper troposphere during the NASA/STRAT campaign are interpreted using a photochemical model…”
Get full text

The Atmospheric Imaging Mission for Northern Regions: AIM-North by Ray Nassar, Chris McLinden, Christopher E. Sioris, C. T. McElroy, Joseph Mendonca, Johanna Tamminen, Cameron G. MacDonald, Cristen Adams, Céline Boisvenue, Adam Bourassa, Ryan Cooney, Doug Degenstein, Guillaume Drolet, Louis Garand, Ralph Girard, Markey Johnson, Dylan B.A. Jones, Felicia Kolonjari, Bruce Kuwahara, Randall V. Martin, Charles E. Miller, Norman O’Neill, Aku Riihelä, Sébastien Roche, Stanley P. Sander, William R. Simpson, Gurpreet Singh, Kimberly Strong, Alexander P. Trishchenko, Helena van Mierlo, Zahra Vaziri Zanjani, Kaley A. Walker, Debra Wunch

“…AIM-North is a proposed satellite mission that would provide observations of unprecedented frequency and density for monitoring northern greenhouse gases…”
Get full text

Derivation of UV-A irradiance from pyranometer measurements by McArthur, L. J. B., Fioletov, V. E., Kerr, J. B., McElroy, C. T., Wardle, D. I.

“…Two statistical models have been developed from 6 years of simultaneous measurements of global radiation by pyranometers, UV‐A by a Brewer spectrophotometer…”
Get full text

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

“…Severe and extensive denitrification, chlorine activation, and photochemical ozone loss were observed throughout the lower stratosphere in the 1999–2000 Arctic…”
Get full text

Extinction-colonization dynamics structure genetic variation of spotted sunfish (Lepomis punctatus) in the Florida Everglades by Mcelroy, T. C., Kandl, K. L., Garcia, J., Trexler, J. C.

“…The population genetics of aquatic animals in the Florida Everglades may be strongly influenced by extinction and colonization dynamics. We combined analyses…”
Get full text

Sources, Sinks, and the Distribution of OH in the Lower Stratosphere by Hanisco, T. F, Lanzendorf, E. J, Wennberg, P. O, Perkins, K. K, Stimpfle, R. M, Voss, P. B, Anderson, J. G, Cohen, R. C, Fahey, D. W, Gao, R. S, Hintsa, E. J, Salawitch, R. J, Margitan, J. J, McElroy, C. T, Midwinter, C

“…Extensive measurement campaigns by the NASA ER-2 research aircraft have obtained a nearly pole-to-pole database of the species that control HO x (OH + HO2)…”
Get full text

Ontogenetic change in relative performance of allozyme genotypes influences detection of heterosis in the earthworm Eisenia andrei by McElroy, T C, Diehl, W J

“…The effect of ontogeny on relationships between allozyme genotypes and fresh weight was measured weekly throughout the life history of the earthworm Eisenia…”
Get full text