Search Results - "Cohan, D. S."

Slower ozone production in Houston, Texas following emission reductions: evidence from Texas Air Quality Studies in 2000 and 2006 by Zhou, W, Cohan, D. S, Henderson, B. H

“…Airborne measurements from two Texas Air Quality Study (TexAQS) field campaigns have been used to investigate changes of ozone production in Houston, Texas,…”
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Observation and modeling of the evolution of Texas power plant plumes by Zhou, W, Cohan, D. S, Pinder, R. W, Neuman, J. A, Holloway, J. S, Peischl, J, Ryerson, T. B, Nowak, J. B, Flocke, F, Zheng, W. G

“…During the second Texas Air Quality Study 2006 (TexAQS II), a full range of pollutants was measured by aircraft in eastern Texas during successive transects of…”
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Influence of satellite-derived photolysis rates and NOx emissions on Texas ozone modeling by Tang, W, Cohan, D S, Pour-Biazar, A, Lamsal, L N, White, A T, Xiao, X, Zhou, W, Henderson, B H, Lash, B F

“…Uncertain photolysis rates and emission inventory impair the accuracy of state-level ozone (O3) regulatory modeling. Past studies have separately used…”
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Inverse modeling of Texas NOx emissions using space-based and ground-based NO2 observations by W. Tang, D. S. Cohan, L. N. Lamsal, X. Xiao, W. Zhou

“…Inverse modeling of nitrogen oxide (NOx) emissions using satellite-based NO2 observations has become more prevalent in recent years, but has rarely been…”
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Extension and evaluation of sensitivity analysis capabilities in a photochemical model by Napelenok, S.L., Cohan, D.S., Odman, M.T., Tonse, S.

“…The decoupled direct method in three dimensions (DDM-3D) provides an efficient and accurate approach for probing the sensitivity of atmospheric pollutant…”
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Nonlinear Response of Ozone to Emissions:  Source Apportionment and Sensitivity Analysis by Cohan, Daniel S, Hakami, Amir, Hu, Yongtao, Russell, Armistead G

“…For secondary air pollutants, precursor emissions may impact concentrations in nonlinear and interdependent manners. We explore the nonlinear responses of one…”
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Atmospheric methyl iodide at Cape Grim, Tasmania, from AGAGE observations by COHAN, D. S, STURROCK, G. A, BIAZAR, A. P, FRASER, P. J

“…Atmospheric mixing ratios of methyl iodide (CH^sub 3^I) and other methyl halides have been measured at Cape Grim, Tasmania (41°S, 145°E), since early 1998 as…”
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Transferrin and the transferrin cycle in Belgrade rat reticulocytes by GARRICK, M. D, GNIECKO, K, YEHENG LIU, COHAN, D. S, GARRICK, L. M

“…Belgrade rats have an autosomal recessive anemia with hypochromia and microcytosis. Iron uptake into reticulocytes is approximately 20% of normal, but…”
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Impact of atmospheric aerosol light scattering and absorption on terrestrial net primary productivity by Cohan, Daniel S., Xu, Jin, Greenwald, Roby, Bergin, Michael H., Chameides, William L.

“…Scattering and absorption of sunlight by anthropogenic aerosols reduce the photosynthetically active radiation (PAR) incident upon the Earth's surface, but…”
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Iron Distribution in Belgrade Rat Reticulocytes After Inhibition of Heme Synthesis With Succinylacetone by Garrick, Laura M., Gniecko, Kathleen, Liu, Yeheng, Cohan, Daniel S., Grasso, Joseph A., Garrick, Michael D.

“…We have used succinylacetone (4,6-dioxoheptanoic acid), a specific inhibitor of δ-aminolevulinic acid dehydrase, to gain insight into the defect in iron…”
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Convective injection and photochemical decay of peroxides in the tropical upper troposphere: Methyl iodide as a tracer of marine convection by Cohan, Daniel S., Schultz, Martin G., Jacob, Daniel J., Heikes, Brian G., Blake, Donald R.

“…The convective injection and subsequent fate of the peroxides H2O2 and CH3OOH in the upper troposphere is investigated using aircraft observations from the…”
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Cost-Benefit Analysis in the Selection of Efficient Multipollutant Strategies by Chestnut, Lauraine G., Mills, David M., Cohan, Daniel S.

“…Pollution control efforts are motivated by the desire to protect human health and the environment. Often, those efforts involve selecting among multiple…”
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Mechanistic representation of soil nitrogen emissions in the Community Multiscale Air Quality (CMAQ) model v 5.1 by Rasool, Quazi Z, Bash, Jesse O, Cohan, Daniel S

“…Soils are important sources of emissions of nitrogen-containing (N-containing) gases such as nitric oxide (NO), nitrous acid (HONO), nitrous oxide (N2O), and…”
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Inverse modeling of Texas NO.sub.x emissions using space-based and ground-based NO.sub.2 observations by Tang, W, Cohan, D. S, Lamsal, L. N, Xiao, X, Zhou, W

“…Inverse modeling of nitrogen oxide (NO.sub.x) emissions using satellite-based NO.sub.2 observations has become more prevalent in recent years, but has rarely…”
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Inverse modeling of Texas NO x emissions using space-based and ground-based NO 2 observations by Tang, W., Cohan, D. S., Lamsal, L. N., Xiao, X., Zhou, W.

“…Inverse modeling of nitrogen oxide (NOx) emissions using satellite-based NO2 observations has become more prevalent in recent years, but has rarely been…”
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Enhanced representation of soil NO emissions in the Community Multiscale Air Quality (CMAQ) model version 5.0.2 by Rasool, Quazi Z., Zhang, Rui, Lash, Benjamin, Cohan, Daniel S., Cooter, Ellen J., Bash, Jesse O., Lamsal, Lok N.

“…Modeling of soil nitric oxide (NO) emissions is highly uncertain and may misrepresent its spatial and temporal distribution. This study builds upon a recently…”
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Influence of satellite-derived photolysis rates and NO.sub.x emissions on Texas ozone modeling by Tang, W, Cohan, D. S, Pour-Biazar, A, Lamsal, L. N, White, A. T, Xiao, X, Zhou, W, Henderson, B. H, Lash, B. F

“…Uncertain photolysis rates and emission inventory impair the accuracy of state-level ozone (O.sub.3) regulatory modeling. Past studies have separately used…”
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Influence of satellite-derived photolysis rates and NO x emissions on Texas ozone modeling by Tang, W., Cohan, D. S., Pour-Biazar, A., Lamsal, L. N., White, A. T., Xiao, X., Zhou, W., Henderson, B. H., Lash, B. F.

“…Uncertain photolysis rates and emission inventory impair the accuracy of state-level ozone (O3) regulatory modeling. Past studies have separately used…”
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Uncertainty Analysis of Ozone Formation and Response to Emission Controls Using Higher-Order Sensitivities by Tian, Di, Cohan, Daniel S., Napelenok, Sergey, Bergin, Michelle, Hu, Yongtao, Chang, Michael, Russell, Armistead G.

“…Understanding ozone response to its precursor emissions is crucial for effective air quality management practices. This nonlinear response is usually simulated…”
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Dependence of ozone sensitivity analysis on grid resolution by Cohan, Daniel S., Hu, Yongtao, Russell, Armistead G.

“…We examine the extent to which the sensitivity of ground-level ozone concentrations to precursor emissions varies with grid resolution in a regional air…”
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