Search Results - "Pollack, I."

Source characterization of volatile organic compounds in the Colorado Northern Front Range Metropolitan Area during spring and summer 2015 by Abeleira, A., Pollack, I. B., Sive, B., Zhou, Y., Fischer, E. V., Farmer, D. K.

“…Hourly measurements of 46 volatile organic compounds (VOCs) from the Boulder Atmospheric Observatory in Erie, CO, were collected over 16 weeks in spring and…”
Get full text

A large and ubiquitous source of atmospheric formic acid by Millet, D. B, Baasandorj, M, Farmer, D. K, Thornton, J. A, Baumann, K, Brophy, P, Chaliyakunnel, S, de Gouw, J. A, Graus, M, Hu, L, Koss, A, Lee, B. H, Lopez-Hilfiker, F. D, Neuman, J. A, Paulot, F, Peischl, J, Pollack, I. B, Ryerson, T. B, Warneke, C, Williams, B. J, Xu, J

“…Formic acid (HCOOH) is one of the most abundant acids in the atmosphere, with an important influence on precipitation chemistry and acidity. Here we employ a…”
Get full text

Hypoxia promotes expansion of the CD133-positive glioma stem cells through activation of HIF-1α by Soeda, A, Park, M, Lee, D, Mintz, A, Androutsellis-Theotokis, A, McKay, R D, Engh, J, Iwama, T, Kunisada, T, Kassam, A B, Pollack, I F, Park, D M

“…Hypoxia contributes to the progression of a variety of cancers by activating adaptive transcriptional programs that promote cell survival, motility and tumor…”
Get full text

HONO emission and production determined from airborne measurements over the Southeast U.S by Neuman, J. A., Trainer, M., Brown, S. S., Min, K.‐E., Nowak, J. B., Parrish, D. D., Peischl, J., Pollack, I. B., Roberts, J. M., Ryerson, T. B., Veres, P. R.

“…The sources and distribution of tropospheric nitrous acid (HONO) were examined using airborne measurements over the Southeast U.S. during the Southeast Nexus…”
Get full text

Formaldehyde production from isoprene oxidation across NOx regimes by Wolfe, G M, Kaiser, J, Hanisco, T F, Keutsch, F N, de Gouw, J A, Gilman, J B, Graus, M, Hatch, C D, Holloway, J, Horowitz, L W, Lee, B H, Lerner, B M, Lopez-Hilifiker, F, Mao, J, Marvin, M R, Peischl, J, Pollack, I B, Roberts, J M, Ryerson, T B, Thornton, J A, Veres, P R, Warneke, C

“…The chemical link between isoprene and formaldehyde (HCHO) is a strong, nonlinear function of NOx (i.e., NO + NO2). This relationship is a linchpin for…”
Get full text

Airborne and ground-based observations of a weekend effect in ozone, precursors, and oxidation products in the California South Coast Air Basin by Pollack, I. B., Ryerson, T. B., Trainer, M., Parrish, D. D., Andrews, A. E., Atlas, E. L., Blake, D. R., Brown, S. S., Commane, R., Daube, B. C., de Gouw, J. A., Dubé, W. P., Flynn, J., Frost, G. J., Gilman, J. B., Grossberg, N., Holloway, J. S., Kofler, J., Kort, E. A., Kuster, W. C., Lang, P. M., Lefer, B., Lueb, R. A., Neuman, J. A., Nowak, J. B., Novelli, P. C., Peischl, J., Perring, A. E., Roberts, J. M., Santoni, G., Schwarz, J. P., Spackman, J. R., Wagner, N. L., Warneke, C., Washenfelder, R. A., Wofsy, S. C., Xiang, B.

“…Airborne and ground‐based measurements during the CalNex (California Research at the Nexus of Air Quality and Climate Change) field study in May/June 2010 show…”
Get full text

Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation by Kaiser, J, Wolfe, G. M, Min, K. E, Brown, S. S, Miller, C. C, Jacob, D. J, deGouw, J. A, Graus, M, Hanisco, T. F, Holloway, J, Peischl, J, Pollack, I. B, Ryerson, T. B, Warneke, C, Washenfelder, R. A, Keutsch, F. N

“…The yield of formaldehyde (HCHO) and glyoxal (CHOCHO) from oxidation of volatile organic compounds (VOCs) depends on precursor VOC structure and the…”
Get full text

Upper tropospheric ozone production from lightning NOx‐impacted convection: Smoke ingestion case study from the DC3 campaign by Apel, E. C., Hornbrook, R. S., Hills, A. J., Blake, N. J., Barth, M. C., Weinheimer, A., Cantrell, C., Rutledge, S. A., Basarab, B., Crawford, J., Diskin, G., Homeyer, C. R., Campos, T., Flocke, F., Fried, A., Blake, D. R., Brune, W., Pollack, I., Peischl, J., Ryerson, T., Wennberg, P. O., Crounse, J. D., Wisthaler, A., Mikoviny, T., Huey, G., Heikes, B., O'Sullivan, D., Riemer, D. D.

“…As part of the Deep Convective Cloud and Chemistry (DC3) experiment, the National Science Foundation/National Center for Atmospheric Research (NCAR)…”
Get full text

Lightning NOx Emissions: Reconciling Measured and Modeled Estimates With Updated NOx Chemistry by Nault, B. A., Laughner, J. L., Wooldridge, P. J., Crounse, J. D., Dibb, J., Diskin, G., Peischl, J., Podolske, J. R., Pollack, I. B., Ryerson, T. B., Scheuer, E., Wennberg, P. O., Cohen, R. C.

“…Lightning is one of the most important sources of upper tropospheric NOx; however, there is a large spread in estimates of the global emission rates…”
Get full text

The glyoxal budget and its contribution to organic aerosol for Los Angeles, California, during CalNex 2010 by Washenfelder, R. A., Young, C. J., Brown, S. S., Angevine, W. M., Atlas, E. L., Blake, D. R., Bon, D. M., Cubison, M. J., de Gouw, J. A., Dusanter, S., Flynn, J., Gilman, J. B., Graus, M., Griffith, S., Grossberg, N., Hayes, P. L., Jimenez, J. L., Kuster, W. C., Lefer, B. L., Pollack, I. B., Ryerson, T. B., Stark, H., Stevens, P. S., Trainer, M. K.

“…Recent laboratory and field studies have indicated that glyoxal is a potentially large contributor to secondary organic aerosol mass. We present in situ…”
Get full text

Transition from high- to low-NOx control of night-time oxidation in the southeastern US by Edwards, P. M., Aikin, K. C., Dube, W. P., Fry, J. L., Gilman, J. B., de Gouw, J. A., Graus, M. G., Hanisco, T. F., Holloway, J., Hübler, G., Kaiser, J., Keutsch, F. N., Lerner, B. M., Neuman, J. A., Parrish, D. D., Peischl, J., Pollack, I. B., Ravishankara, A. R., Roberts, J. M., Ryerson, T. B., Trainer, M., Veres, P. R., Wolfe, G. M., Warneke, C., Brown, S. S.

“…The influence of nitrogen oxides (NO x ) on daytime atmospheric oxidation cycles is well known, with clearly defined high- and low-NO x regimes. During the…”
Get full text

Observations of ozone transport from the free troposphere to the Los Angeles basin by Neuman, J. A., Trainer, M., Aikin, K. C., Angevine, W. M., Brioude, J., Brown, S. S., de Gouw, J. A., Dube, W. P., Flynn, J. H., Graus, M., Holloway, J. S., Lefer, B. L., Nedelec, P., Nowak, J. B., Parrish, D. D., Pollack, I. B., Roberts, J. M., Ryerson, T. B., Smit, H., Thouret, V., Wagner, N. L.

“…Analysis of in situ airborne measurements from the CalNex 2010 field experiment (Research at the Nexus of Air Quality and Climate Change) show that ozone in…”
Get full text

Atmospheric emissions from the Deepwater Horizon spill constrain air-water partitioning, hydrocarbon fate, and leak rate by Ryerson, T. B., Aikin, K. C., Angevine, W. M., Atlas, E. L., Blake, D. R., Brock, C. A., Fehsenfeld, F. C., Gao, R.-S., de Gouw, J. A., Fahey, D. W., Holloway, J. S., Lack, D. A., Lueb, R. A., Meinardi, S., Middlebrook, A. M., Murphy, D. M., Neuman, J. A., Nowak, J. B., Parrish, D. D., Peischl, J., Perring, A. E., Pollack, I. B., Ravishankara, A. R., Roberts, J. M., Schwarz, J. P., Spackman, J. R., Stark, H., Warneke, C., Watts, L. A.

“…The fate of deepwater releases of gas and oil mixtures is initially determined by solubility and volatility of individual hydrocarbon species; these attributes…”
Get full text

Observed NO/NO2 Ratios in the Upper Troposphere Imply Errors in NO‐NO2‐O3 Cycling Kinetics or an Unaccounted NOx Reservoir by Silvern, R. F., Jacob, D. J., Travis, K. R., Sherwen, T., Evans, M. J., Cohen, R. C., Laughner, J. L., Hall, S. R., Ullmann, K., Crounse, J. D., Wennberg, P. O., Peischl, J., Pollack, I. B.

“…Observations from the SEAC4RS aircraft campaign over the southeast United States in August–September 2013 show NO/NO2 concentration ratios in the upper…”
Get full text

Measurement of western U.S. baseline ozone from the surface to the tropopause and assessment of downwind impact regions by Cooper, O. R., Oltmans, S. J., Johnson, B. J., Brioude, J., Angevine, W., Trainer, M., Parrish, D. D., Ryerson, T. R., Pollack, I., Cullis, P. D., Ives, M. A., Tarasick, D. W., Al-Saadi, J., Stajner, I.

“…Since 1997, baseline ozone monitoring from the surface to the tropopause along the U.S. west coast has been limited to the weekly ozonesondes from Trinidad…”
Get full text

Modeling the weekly cycle of NOx and CO emissions and their impacts on O3 in the Los Angeles‐South Coast Air Basin during the CalNex 2010 field campaign by Kim, S.‐W., McDonald, B. C., Baidar, S., Brown, S. S., Dube, B., Ferrare, R. A., Frost, G. J., Harley, R. A., Holloway, J. S., Lee, H.‐J., McKeen, S. A., Neuman, J. A., Nowak, J. B., Oetjen, H., Ortega, I., Pollack, I. B., Roberts, J. M., Ryerson, T. B., Scarino, A. J., Senff, C. J., Thalman, R., Trainer, M., Volkamer, R., Wagner, N., Washenfelder, R. A., Waxman, E., Young, C. J.

“…We developed a new nitrogen oxide (NOx) and carbon monoxide (CO) emission inventory for the Los Angeles‐South Coast Air Basin (SoCAB) expanding the Fuel‐based…”
Get full text

Parametric Response Mapping of Apparent Diffusion Coefficient as an Imaging Biomarker to Distinguish Pseudoprogression from True Tumor Progression in Peptide-Based Vaccine Therapy for Pediatric Diffuse Intrinsic Pontine Glioma by Ceschin, R, Kurland, B F, Abberbock, S R, Ellingson, B M, Okada, H, Jakacki, R I, Pollack, I F, Panigrahy, A

“…Immune response to cancer therapy may result in pseudoprogression, which can only be identified retrospectively and may disrupt an effective therapy. This…”
Get full text

Convective transport and scavenging of peroxides by thunderstorms observed over the central U.S. during DC3 by Barth, M. C., Bela, M. M., Fried, A., Wennberg, P. O., Crounse, J. D., St. Clair, J. M., Blake, N. J., Blake, D. R., Homeyer, C. R., Brune, W. H., Zhang, L., Mao, J., Ren, X., Ryerson, T. B., Pollack, I. B., Peischl, J., Cohen, R. C., Nault, B. A., Huey, L. G., Liu, X., Cantrell, C. A.

“…One of the objectives of the Deep Convective Clouds and Chemistry (DC3) field experiment was to determine the scavenging of soluble trace gases by…”
Get full text

Hydrocarbon Removal in Power Plant Plumes Shows Nitrogen Oxide Dependence of Hydroxyl Radicals by Gouw, J. A., Parrish, D. D., Brown, S. S., Edwards, P., Gilman, J. B., Graus, M., Hanisco, T. F., Kaiser, J., Keutsch, F. N., Kim, S.‐W., Lerner, B. M., Neuman, J. A., Nowak, J. B., Pollack, I. B., Roberts, J. M., Ryerson, T. B., Veres, P. R., Warneke, C., Wolfe, G. M.

“…During an airborne study in the Southeast United States, measured mixing ratios of biogenic hydrocarbons were systematically lower in air masses containing…”
Get full text

Injection of lightning‐produced NOx, water vapor, wildfire emissions, and stratospheric air to the UT/LS as observed from DC3 measurements by Huntrieser, H., Lichtenstern, M., Scheibe, M., Aufmhoff, H., Schlager, H., Pucik, T., Minikin, A., Weinzierl, B., Heimerl, K., Pollack, I. B., Peischl, J., Ryerson, T. B., Weinheimer, A. J., Honomichl, S., Ridley, B. A., Biggerstaff, M. I., Betten, D. P., Hair, J. W., Butler, C. F., Schwartz, M. J., Barth, M. C.

“…During the Deep Convective Clouds and Chemistry (DC3) experiment in summer 2012, airborne measurements were performed in the anvil inflow/outflow of…”
Get full text