Search Results - "Swartz, W H"

Evaluation of OMI operational standard NO2 column retrievals using in situ and surface-based NO2 observations by Lamsal, L N, Krotkov, N A, Celarier, E A, Swartz, W H, Pickering, K E, Bucsela, E J, Gleason, J F, Martin, R V, Philip, S, Irie, H, Cede, A, Herman, J, Weinheimer, A, Szykman, J J, Knepp, T N

“…We assess the standard operational nitrogen dioxide (NO2) data product (OMNO2, version 2.1) retrieved from the Ozone Monitoring Instrument (OMI) onboard NASA's…”
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Revising the slant column density retrieval of nitrogen dioxide observed by the Ozone Monitoring Instrument by Marchenko, S., Krotkov, N. A., Lamsal, L. N., Celarier, E. A., Swartz, W. H., Bucsela, E. J.

“…Nitrogen dioxide retrievals from the Aura/Ozone Monitoring Instrument (OMI) have been used extensively over the past decade, particularly in the study of…”
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A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI by Bucsela, E J, Krotkov, N A, Celarier, E A, Lamsal, L N, Swartz, W H, Bhartia, P K, Boersma, K F, Veefkind, J P, Gleason, J F, Pickering, K E

“…We describe a new algorithm for the retrieval of nitrogen dioxide (NO2 ) vertical columns from nadir-viewing satellite instruments. This algorithm (SP2) is the…”
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Calculations of solar shortwave heating rates due to black carbon and ozone absorption using in situ measurements by Gao, R. S., Hall, S. R., Swartz, W. H., Schwarz, J. P., Spackman, J. R., Watts, L. A., Fahey, D. W., Aikin, K. C., Shetter, R. E., Bui, T. P.

“…Results for the solar heating rates in ambient air due to absorption by black-carbon (BC) containing particles and ozone are presented as calculated from…”
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Middle atmosphere response to different descriptions of the 11-yr solar cycle in spectral irradiance in a chemistry-climate model by Swartz, W. H, Stolarski, R. S, Oman, L. D, Fleming, E. L, Jackman, C. H

“…The 11-yr solar cycle in solar spectral irradiance (SSI) inferred from measurements by the SOlar Radiation & Climate Experiment (SORCE) suggests a much larger…”
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Heating rates and surface dimming due to black carbon aerosol absorption associated with a major U.S. city by Schwarz, J. P., Stark, H., Spackman, J. R., Ryerson, T. B., Peischl, J., Swartz, W. H., Gao, R. S., Watts, L. A., Fahey, D. W.

“…In situ airborne measurements of actinic flux and the mass and mixing state of individual refractory black carbon (BC) particles were made in the lower…”
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Measurements of trace gases in the tropical tropopause layer by Marcy, T.P., Popp, P.J., Gao, R.S., Fahey, D.W., Ray, E.A., Richard, E.C., Thompson, T.L., Atlas, E.L., Loewenstein, M., Wofsy, S.C., Park, S., Weinstock, E.M., Swartz, W.H., Mahoney, M.J.

“…A unique dataset of airborne in situ observations of HCl, O 3, HNO 3, H 2O, CO, CO 2 and CH 3Cl has been made in and near the tropical tropopause layer (TTL)…”
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High-Resolution NO2 Observations from the Airborne Compact Atmospheric Mapper: Retrieval and Validation by Lamsal, L. N., Janz, S. J., Krotkov, N. A., Pickering, K. E., Spurr, R. J. D., Kowalewski, M. G., Loughner, C. P., Crawford, J. H., Swartz, W. H., Herman, J. R.

“…Nitrogen dioxide (NO2) is a short-lived atmospheric pollutant that serves as an air quality indicator and is itself a health concern. The Airborne Compact…”
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Isolating the roles of different forcing agents in global stratospheric temperature changes using model integrations with incrementally added single forcings by Aquila, V., Swartz, W. H., Waugh, D. W., Colarco, P. R., Pawson, S., Polvani, L. M., Stolarski, R. S.

“…Satellite instruments show a cooling of global stratospheric temperatures over the whole data record (1979–2014). This cooling is not linear and includes two…”
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Photolysis frequency of O3 to O(1D): Measurements and modeling during the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) by Hofzumahaus, A., Lefer, B. L., Monks, P. S., Hall, S. R., Kylling, A., Mayer, B., Shetter, R. E., Junkermann, W., Bais, A., Calvert, J. G., Cantrell, C. A., Madronich, S., Edwards, G. D., Kraus, A., Müller, M., Bohn, B., Schmitt, R., Johnston, P., McKenzie, R., Frost, G. J., Griffioen, E., Krol, M., Martin, T., Pfister, G., Röth, E. P., Ruggaber, A., Swartz, W. H., Lloyd, S. A., Van Weele, M.

“…The International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) took place at Boulder, Colorado, from 15 to 19 June 1998 and offered…”
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Reconstruction of three-dimensional ozone fields using POAM III during SOLVE by Randall, C. E., Lumpe, J. D., Bevilacqua, R. M., Hoppel, K. W., Fromm, M. D., Salawitch, R. J., Swartz, W. H., Lloyd, S. A., Kyro, E., von der Gathen, P., Claude, H., Davies, J., DeBacker, H., Dier, H., Molyneux, M. J., Sancho, J.

“…In this paper we demonstrate the utility of the Polar Ozone and Aerosol Measurement (POAM) III data for providing semiglobal three‐dimensional ozone fields…”
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Comparison of high-latitude line-of-sight ozone column density with derived ozone fields and the effects of horizontal inhomogeneity by Swartz, W. H., Yee, J.-H., Randall, C. E., Shetter, R. E., Browell, E. V., Burris, J. F., McGee, T. J., Avery, M. A.

“…Extensive ozone measurements were made during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II). We compare high-latitude line-of-sight (LOS)…”
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The use of NO2 absorption cross section temperature sensitivity to derive NO2 profile temperature and stratospheric–tropospheric column partitioning from visible direct-sun DOAS measurements by E. Spinei, A. Cede, W. H. Swartz, J. Herman, G. H. Mount

“…This paper presents a temperature sensitivity method (TESEM) to accurately calculate total vertical NO2 column, atmospheric slant NO2 profile-weighted…”
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Ozone observations by the Gas and Aerosol Measurement Sensor during SOLVE II by Pitts, M. C., Thomason, L. W., Zawodny, J. M., Wenny, B. N., Livingston, J. M., Russell, P. B., Yee, J.-H., Swartz, W. H., Shetter, R. E.

“…The Gas and Aerosol Measurement Sensor (GAMS) was deployed aboard the NASA DC-8 aircraft during the second SAGE III Ozone Loss and Validation Experiment (SOLVE…”
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Column ozone and aerosol optical properties retrieved from direct solar irradiance measurements during SOLVE II by Swartz, W. H., Yee, J.-H., Shetter, R. E., Hall, S. R., Lefer, B. L., Livingston, J. M., Russell, P. B., Browell, E. V., Avery, M. A.

“…Direct observation of the Sun at large solar zenith angles during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II)/Validation of…”
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Twilight observations suggest unknown sources of HOx by Wennberg, P. O., Salawitch, R. J., Donaldson, D. J., Hanisco, T. F., Lanzendorf, E. J., Perkins, K. K., Lloyd, S. A., Vaida, V., Gao, R. S., Hintsa, E. J., Cohen, R. C., Swartz, W. H., Kusterer, T. L., Anderson, D. E.

“…Measurements of the concentrations of OH and HO2 (HOx) in the high‐latitude lower stratosphere imply the existence of unknown photolytic sources of HOx. The…”
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Retrieval of ozone column content from airborne Sun photometer measurements during SOLVE II: comparison with coincident satellite and aircraft measurements by Livingston, J. M., Schmid, B., Russell, P. B., Eilers, J. A., Kolyer, R. W., Redemann, J., Ramirez, S. R., Yee, J.-H., Swartz, W. H., Trepte, C. R., Thomason, L. W., Pitts, M. C., Avery, M. A., Randall, C. E., Lumpe, J. D., Bevilacqua, R. M., Bittner, M., Erbertseder, T., McPeters, R. D., Shetter, R. E., Browell, E. V., Kerr, J. B., Lamb, K.

“…During the 2003 SAGE (Stratospheric Aerosol and Gas Experiment) III Ozone Loss and Validation Experiment (SOLVE) II, the fourteen-channel NASA Ames Airborne…”
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Ozone destruction and production rates between spring and autumn in the Arctic stratosphere by Fahey, D. W., Gao, R. S., Del Negro, L. A., Keim, E. R., Kawa, S. R., Salawitch, R. J., Wennberg, P. O., Hanisco, T. F., Lanzendorf, E. J., Perkins, K. K., Lloyd, S. A., Swartz, W. H., Proffitt, M. H., Margitan, J. J., Wilson, J. C., Stimpfle, R. M., Cohen, R. C., McElroy, C. T., Webster, C. R., Loewenstein, M., Elkins, J. W., Bui, T. P.

“…In situ measurements of radical and long‐lived species were made in the lower Arctic stratosphere (18 to 20 km) between spring and early autumn in 1997. The…”
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Photolysis frequency of NO2: Measurement and modeling during the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) by Shetter, R. E., Junkermann, W., Swartz, W. H., Frost, G. J., Crawford, J. H., Lefer, B. L., Barrick, J. D., Hall, S. R., Hofzumahaus, A., Bais, A., Calvert, J. G., Cantrell, C. A., Madronich, S., Müller, M., Kraus, A., Monks, P. S., Edwards, G. D., McKenzie, R., Johnston, P., Schmitt, R., Griffioen, E., Krol, M., Kylling, A., Dickerson, R. R., Lloyd, S. A., Martin, T., Gardiner, B., Mayer, B., Pfister, G., Röth, E. P., Koepke, P., Ruggaber, A., Schwander, H., van Weele, M.

“…The photolysis frequency of NO2, j(NO2), was determined by various instrumental techniques and calculated using a number of radiative transfer models for 4…”
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International Photolysis Frequency Measurement and Model Intercomparison (IPMMI): Spectral actinic solar flux measurements and modeling by Bais, A. F., Madronich, S., Crawford, J., Hall, S. R., Mayer, B., van Weele, M., Lenoble, J., Calvert, J. G., Cantrell, C. A., Shetter, R. E., Hofzumahaus, A., Koepke, P., Monks, P. S., Frost, G., McKenzie, R., Krotkov, N., Kylling, A., Swartz, W. H., Lloyd, S., Pfister, G., Martin, T. J., Roeth, E.-P., Griffioen, E., Ruggaber, A., Krol, M., Kraus, A., Edwards, G. D., Mueller, M., Lefer, B. L., Johnston, P., Schwander, H., Flittner, D., Gardiner, B. G., Barrick, J., Schmitt, R.

“…The International Photolysis Frequency Measurement and Model Intercomparison (IPMMI) took place in Boulder, Colorado, from 15 to 19 June 1998, aiming to…”
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