World Library  

 
  • Cover Image

Results from the University of Toronto Continuous Flow Diffusion C...

By: J. P. D. Abbatt; O. Möhler; Z. A. Kanji; P. J. Demott

Description: University of Toronto, Department of Chemistry, Toronto, ON, Canada. The University of Toronto continuous flow diffusion chamber (UT-CFDC) was used to study heterogeneous ice nucleation at the International Workshop on Comparing Ice Nucleation Measuring Systems (ICIS 2007) which also represented the 4th ice nucleation workshop, on 14–28 September 2007. One goal of the workshop was to inter-compare different ice nucleation measurement techniques using th...

Abbatt, J. P. D., Benz, S., Cziczo, D. J., Kanji, Z., Lohmann, U., and Mohler, O.: Solid ammonium sulfate aerosols as ice nuclei: A pathway for cirrus cloud formation, Science, {313}(5794), 1770–1773, 2006.; Andreae, M. O. and Rosenfeld, D.: Aerosol-cloud-precipitation interactions. Part 1. The nature and sources of cloud-active aerosols, Earth-Sci. Rev., {89}(1–2), 13–41, 2008.; Ansmann, A., Mattis, I., Muller, D., Wandinger, U., Radlach, M., Althausen, D., and Damoah, ...

Read More
  • Cover Image

Enhanced Extinction of Visible Radiation Due to Hydrated Aerosols ...

By: F. Burnet; C. R. Hoyle; J.-c. Dupont; D. Jolivet; E. Hammer; M. Haeffelin; T. Elias

Description: HYGEOS, Euratechnologies, 59000 Lille, France. The study assesses the contribution of aerosols to the extinction of visible radiation in the mist-fog-mist cycle. Measurements of the microphysical and optical properties of hydrated aerosols with diameters larger than 400 nm, composing the accumulation mode, which are the most efficient to interact with visible radiation, were carried out near Paris, during November 2011, in ambient conditions. Eleve...

Adams, P. J., Seinfeld, J. H., and Koch, D. M.: Global concentration of tropospheric sulfate, nitrate, and ammonium aerosol simulated in a general circulate model, J. Geophys. Res., 104, 13791–13823, 1999.; Ahmed, R., Dey, S., and Mohan, M.: A study to improve night time fog detection in the Indo-Gangetic Basin using satellite data and to investigate the connection to aerosols, Met. Apps., doi:10.1002/met.1468, 2014.; Albrec...

Read More
  • Cover Image

Seasonal and Diurnal Variations of Particulate Nitrate and Organic...

By: W. Birmili; H. Herrmann; G. Spindler; C. Plass-dülmer; L. Poulain; A. Wiedensohler

Description: Leibniz-Institut für Troposphärenforschung (IfT), Leipzig, Germany. Nitrate and several organic compounds such as dicarboxylic acids (e.g. succinic acid, glutaric acid), Polycyclic Aromatic Hydrocarbons (PAHs) or n-alkanes form the group of the most volatile compounds in atmospheric aerosol particles. The transition of these compounds between gas and particulate phase may significantly change the aerosol particles radiative properties, the hetero...

Acker, K., Spindler, G., and Bruggemann, E.: Nitrous and nitric acid measurements during the INTERCOMP2000 campaign in Melpitz, Atmos. Environ., 38, 6497–6505, doi:10.1016/j.atmosenv.2004.08.030, 2004.; Aiken, A. C., DeCarlo, P. F., and Jimenez, J. L.: Elemental analysis of organic species with electron ionization high-resolution mass spectrometry, Anal. Chem., 79, 8350–8358,

Read More
  • Cover Image

The Invigoration of Deep Convective Clouds Over the Atlantic: Aero...

By: L. A. Remer; G. Feingold; I. Koren

Description: Department of Environmental Science and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel. The effects of the aerosol on convective clouds in the tropical Atlantic Ocean are explored using satellite remote sensing, a chemical transport model, and a reanalysis of meteorological fields. Two of the most challenging problems are addressed: the potential for elements of the cloud field to be erroneously ascribed to aerosol ...

Albrecht, B. A.: Aerosols, cloud microphysics, and fractional cloudiness, Science, 245(4923), 1227–1230, 1989.; Altaratz, O., Koren, I., and Reisin, T.: Humidity impact on the aerosol effect in warm cumulus clouds, Geophys. Res. Lett., 35, L17804, doi:10.1029/2008GL034178, 2008.; Andreae, M. O., Rosenfeld, D., Artaxo, P., Costa, A. A., Frank, G. P., Longo, K. M., and Silva-Dias, M. A. F.: Smoking rain clouds over the Ama...

Read More
  • Cover Image

Large Surface Radiative Forcing from Topographic Blowing Snow Resi...

By: J. R. Drummond; L. Bourdages; T. J. Duck; V. P. Walden; E. W. Eloranta; G. Lesins

Description: Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada. Ice crystals, also known as diamond dust, are suspended in the boundary layer air under clear sky conditions during most of the Arctic winter in Northern Canada. Occasionally ice crystal events can produce significantly thick layers with optical depths in excess of 2.0 even in the absence of liquid water clouds. Four case studies of high optical depth ice crystal event...

% vor jede Referenz Blanchet, J.-P. and Girard, E.: Water-vapor temperature feedback in the formation of continental arctic air: implications for climate, Sci. Total Environ., 160/161, 793–802, 1995.; Chen, W.-N., Chiang, C.-W., and Nee, J.-B.: Lidar ratio and depolarization ratio for cirrus clouds, Appl. Optics, 41, 6470–6476, 2002.; Curry, J. A., Rossow, W. B., Randall, D., and Schramm, J. L.: Overview of arctic cloud and radiation characteristics, J. Climate, 9, 1731–...

Read More
  • Cover Image

Spectro-microscopic Measurements of Carbonaceous Aerosol Aging in ...

By: G. T. Carroll; M. K. Gilles; T. C. Rödel; R. C. Moffet; R. A. Zaveri; S. T. Kelly; X. Y. Yu; J. Fast; A. Laskin

Description: Lawrence Berkeley National Laboratory, Berkeley, California, 94720-8198, USA. Carbonaceous aerosols are responsible for large uncertainties in climate models, degraded visibility, and adverse health effects. The Carbonaceous Aerosols and Radiative Effects Study (CARES) was designed to study carbonaceous aerosols in the natural environment of Central Valley, California, and learn more about their atmospheric formation and aging. This paper presents ...

Hansson, H. C., Rood, M. J., Koloutsou-Vakakis, S., Hameri, K., Orsini, D., and Wiedensohler, A.: NaCl aerosol particle hygroscopicity dependence on mixing with organic compounds, J. Atmos. Chem., 31, 321–346, 1998.; Harley, R. A., Marr, L. C., Lehner, J. K., and Giddings, S. N.: Changes in motor vehicle emissions on diurnal to decadal time scales and effects on atmospheric composition, Environ. Sci. Technol., 39, 5356–5362, 2005.; Hopkins, R. J., Tivanski, A. V., Marten...

Read More
  • Cover Image

Size-resolved Aerosol Composition and Link to Hygroscopicity at a ...

By: P. M. Winkler; D. Day; B. Palm; J. Jimenez; P. Campuzano-jost; E. J. T. Levin; J. N. Smith; A. J. Prenni; S. M. Kreidenweis; P. J. Demott

Description: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA. Aerosol hygroscopicity describes the ability of a particle to take up water and form a cloud droplet. Modeling studies have shown sensitivity of precipitation-producing cloud systems to the availability of aerosol particles capable of serving as cloud condensation nuclei (CCN), and hygroscopicity is a key parameter controlling the number of available CCN. Continental ae...

Albrecht, B. A.: Aerosols, cloud microphysics, and fractional cloudiness, Science, 245, 1227–1230, 1989.; Andreae, M. O. and Rosenfeld, D.: Aerosol-cloud-precipitation interactions. Part 1. The nature and sources of cloud-active aerosols, Earth-Sci. Rev., 89, 13–41, doi:10.1016/j.earscirev.2008.03.001, 2008.; Asa-Awuku, A., Nenes, A., Gao, S., Flagan, R. C., and Seinfeld, J. H.: Water-soluble SOA from Alkene o...

Read More
  • Cover Image

The Size Distribution and Mixing State of Black Carbon Aerosol Ove...

By: H. Coe; D. Liu; G. W. Mann; G. McMeeking; M. Flynn; C. L. Reddington; M. G. Frontoso; K. S. Carslaw; D. V. Spracklen

Description: Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK. Black carbon-containing aerosol particles play an important role in the direct and indirect radiative forcing of climate. However, the magnitude and sign of the net radiative effect is strongly dependent on the physical properties of the black carbon (BC) component of the particles, such as mass, number concentration and size distribution. Here...

Koch, D., Balkanski, Y., Bauer, S. E., Easter, R. C., Ferrachat, S., Ghan, S. J., Hoose, C., Iversen, T., Kirkevåg, A., Kristjansson, J. E., Liu, X., Lohmann, U., Menon, S., Quaas, J., Schulz, M., Seland, \O., Takemura, T., and Yan, N.: Soot microphysical effects on liquid clouds, a multi-model investigation, Atmos. Chem. Phys., 11, 1051–1064, doi:10.5194/acp-11-1051-2011, 2011.; Korhonen, H., Carslaw, K. S., Sprackl...

Read More
  • Cover Image

Study of the Unknown Hono Daytime Source at a European Suburban Si...

By: K. Miet; M. Furger; M. Camredon; A. Colomb; A. Borbon; A. Kukui; M. Haeffelin; W. Ait-helal; C. Afif; M. Beekmann; J. F. Doussin; P. Zapf; B. Aumont; V. Michoud; G. Siour; S. Perrier; J. C. Dupont

Description: LISA, UMR-CNRS 7583, Université Paris Est Créteil (UPEC), Université Paris Diderot (UPD), Institut Pierre Simon Laplace (IPSL), Créteil, France. Nitrous acid measurements were carried out during the MEGAPOLI summer and winter field campaigns at SIRTA observatory in Paris surroundings. Highly variable HONO levels were observed during the campaigns, ranging from 10 ppt to 500 ppt in summer and from 10 ppt to 1.7 ppb in winter. Significant HONO mixing ratio...

Acker, K., Febo, A., Trick, S., Perrino, C., Bruno, P., Wiesen, P., Möller, D., Wieprecht, W., Auel, R., Giusto, M., Geyer, A., Platt, U., and Allegrini, I.: Nitrous acid in the urban area of rome, Atmos. Environ., 40, 3123–3133, doi:10.1016/j.atmosenv.2006.01.028, 2006a.; Acker, K., Möller, D., Wieprecht, W., Meixner, F. X., Bohn, B., Gilge, S., Plass-Dülmer, C., and Berresheim, H.: Strong daytime production o...

Read More
  • Cover Image

Wintertime Particulate Pollution Episodes in an Urban Valley of th...

By: J. C. Chow; K. Dick; J. G. Watson; D. Inouye; L.-w. A. Chen; M. C. Green

Description: Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, USA. This study investigates the causes of elevated PM2.5 concentrations and potential exceedences of the US National Ambient Air Quality Standards (NAAQS) in Truckee Meadows, Nevada, an urban valley of the Western US, during winter 2009/2010. Continuous PM2.5 mass and time-integrated chemical speciation data were acquir...

Ahmed, T., Dutkiewicz, V. A., Shareef, A., Tuncel, G., Tuncel, S., and Husain, L.: Measurement of black carbon (BC) by an optical method and a thermal-optical method: intercomparison for four sites, Atmos. Environ., 43, 6305–6311, 2009.; Aiken, A. C., DeCarlo, P. F., Kroll, J. H., Worsnop, D. R., Huffman, J. A., Docherty, K. S., Ulbrich, I. M., Mohr, C., Kimmel, J. R., Sueper, D., Sun, Y., Zhang, Q., Trimborn, A., Northway, M., Ziemann, P. J., Canagaratna, M. R., Onasch,...

Read More
  • Cover Image

Clear Sky Uv Simulations for the 21St Century Based on Ozone and T...

By: A. F. Bais; D. E. Kinnison; M. P. Chipperfield; M. A. Giorgetta; A. Kazantzidis; J. Austin; D. R. Marsh; E. Rozanov; V. Eyring; C. S. Zerefos; D. A. Plummer; T. Nagashima; M. Deushi; G. Pitari; K. Shibata; H. Akiyoshi; E. Mancini; K. Tourpali; C. Brühl; M. Dameris; N. Butchart; W. Tian

Description: Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece. We have estimated changes in surface solar ultraviolet (UV) radiation under cloud free conditions in the 21st century based on simulations of 11 coupled Chemistry-Climate Models (CCMs). The total ozone columns and vertical profiles of ozone and temperature projected from CCMs were used as input to a radiative transfer model in order to calculate the corresponding erythemal ...

% vor jede Referenz Akiyoshi, H., Sugita, T., Kanzawa, H., and Kawamoto, N.: Ozone perturbations in the Arctic summer lower stratosphere as a reflection of NOX chemistry and planetary scale wave activity, J. Geophys. Res., 109, D03304, doi:03310.01029/02003JD003632, 2004.; % vor jede Referenz Anderson, G. P., Clough, S. A., Kneizys, F. X., Chetwynd, J. H., and Shettle, E. P.: AFGL atmospheric constituent profiles (0–120 km), Tech. Rep. AFGL-TR-86-0110, Mass., Air Force G...

Read More
  • Cover Image

Efficiency of Immersion Mode Ice Nucleation on Surrogates of Miner...

By: T. Peter; B. Zobrist; S. Gedamke; C. Marcolli

Description: Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland. A differential scanning calorimeter (DSC) was used to explore heterogeneous ice nucleation of emulsified aqueous suspensions of two Arizona test dust (ATD) samples with particle diameters of nominally 0–3 and 0–7 Μm, respectively. Aqueous suspensions with ATD concentrations of 0.01–20 wt% have been investigated. The DSC thermograms exhibit a homogeneous and a heterogeneous freezin...

Archuleta, C. M., DeMott, P. J., and Kreidenweis, S. M.: Ice nucleation by surrogates for atmospheric mineral dust and mineral dust/sulfate particles at cirrus temperatures, Atmos. Chem. Phys., 5, 2617–2634, 2005.; Baker, M. B.: Cloud microphysics and climate, Science, 276, 1072–1078, 1997.; Benz, S., Megahed, K., Möhler, O., Saathoff, H., Wagner, R., and Schurath, U.: T-dependent rate measurements of homogeneous ice nucleation in cloud droplets using a large atmospheric...

Read More
  • Cover Image

Mexico City Basin Wind Circulation During the McMa-2003 Field Camp...

By: B. Cárdenas; A. Retama; E. Caetano; A. Zitácuaro; V. Magaña; R. Ramos; B. De Foy; M. J. Molina; L. T. Molina

Description: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA. MCMA-2003 was a major field campaign investigating the atmospheric chemistry of the Mexico City Metropolitan Area (MCMA) in April of 2003. This paper describes the wind circulation patterns during the campaign both within the Mexico City basin and on the regional scale. ''Time roses'' are introduced to concisely analyze the diurnal wind patterns. Three e...

Read More
  • Cover Image

Köhler Theory for a Polydisperse Droplet Population in the Presenc...

By: A. Laaksonen; H. Kokkola; S. Romakkaniemi

Description: Department of Applied Physics, University of Kuopio, Finland. We consider the equilibrium behavior of a polydisperse aqueous droplet population as a function of relative humidity (RH) when a soluble trace gas, such as nitric acid, is present in the system. The droplet population experiences a splitting when the RH is increased sufficiently. This splitting is not related to the traditional Köhler activation of cloud droplets, as it may occur at re...

Read More
  • Cover Image

The Simulation of the Antarctic Ozone Hole by Chemistry-climate Mo...

By: J. Austin; M. Schraner; G. E. Bodeker; S. Bekki; T. Peter; E. Rozanov; H. Struthers; E. Manzini; I. Cionni; M. A. Giorgetta; M. Dameris; F. Lott; F. Lefèvre; V. Grewe

Description: National Institute of Water and Atmospheric Research, Lauder, New Zealand. While chemistry-climate models are able to reproduce many characteristics of the global total column ozone field and its long-term evolution, they have fared less well in simulating the commonly used diagnostic of the area of the Antarctic ozone hole i.e. the area within the 220 Dobson Unit (DU) contour. Two possible reasons for this are: (1) the underlying Global Climate Model (G...

Austin, J.: A three-dimensional coupled chemistry-climate model simulation of past stratospheric trends, J. Atmos. Sci., 59, 218–232, 2002.; Austin, J., Shindell, D., Beagley, S. R., Brühl, C., Dameris, M., Manzini, E., Nagashima, T., Newman, P., Pawson, S., Pitari, G., Rozanov, E., Schnadt, C., and Shepherd, T. G.: Uncertainties and assessments of chemistry-climate models of the stratosphere, Atmos. Chem. Phys., 3, 1–27, 2003.; Austin, J. and Wilson, R. J.: Ensemble sim...

Read More
  • Cover Image

Origin, Variability and Age of Biomass Burning Plumes Intercepted ...

By: P. I. Palmer; M. Parrington; D. P. Finch

Description: School of GeoSciences, University of Edinburgh, UK. We use the GEOS-Chem atmospheric chemistry transport model to interpret aircraft measurements of carbon monoxide (CO) in biomass burning outflow taken during the 2011 BORTAS-B campaign over eastern Canada. The model has some skill reproducing the observed variability (r = 0.45) but has a negative bias for observations below 100 ppb and a positive bias above 300 ppb. We find that observed ...

Bian, H., Colarco, P. R., Chin, M., Chen, G., Rodriguez, J. M., Liang, Q., Blake, D., Chu, D. A., da Silva, A., Darmenov, A. S., Diskin, G., Fuelberg, H. E., Huey, G., Kondo, Y., Nielsen, J. E., Pan, X., and Wisthaler, A.: Source attributions of pollution to the Western Arctic during the NASA ARCTAS field campaign, Atmos. Chem. Phys., 13, 4707–4721, doi:10.5194/acp-13-4707-2013, 2013.; Duncan, B. N., Logan, J. A., Be...

Read More
  • Cover Image

Understanding and Forecasting Polar Stratospheric Variability with...

By: C. Blume; K. Matthes

Description: Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Potsdam, Germany. The variability of the north-polar stratospheric vortex is a prominent aspect of the middle atmosphere. This work investigates a wide class of statistical models with respect to their ability to model geopotential and temperature anomalies, representing variability in the polar stratosphere. Four partly nonstationary, nonlinear models are assessed: linear discrimi...

Akaike, H.: A new look at the statistical model identification, IEEE T. Automat. Contr., 19, 716–723, 1974.; Ariew, R.: Ockham's Razor: A Historical and Philosophical Analysis of Ockham's Principle of Parsimony, Ph.D. thesis, Champaign-Urbana, University of Illinois, 1976.; Avriel, M.: Nonlinear Programming: Analysis and Methods, Dover Publishing, 2003.; Baldwin, M. and Dunkerton, T.: Stratospheric harbingers of anomalous Weather Regimes, Science, 294, 581–584, 2001.; Ba...

Read More
  • Cover Image

In Situ Measurements of Molecular Iodine in the Marine Boundary La...

By: J. Buxmann; K. Seitz; D. Poehler; L. J. Carpenter; R.-j. Huang; K. E. Hornsby; U. Platt; T. Hoffmann

Description: Institute for Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10–14, 55128 Mainz, Germany. Single-point in situ measurements of molecular iodine (I2) were carried out in the coastal marine boundary layer (MBL) using diffusion denuders in combination with a gas chromatography-mass spectrometry (GC-MS) method. Comparison measurements were taken at Mace Head and Mweenish Bay, on the West Coast of Ireland. T...

Alicke, B., Hebestreit, K., Stutz, J., and Platt, U.: Iodine oxide in the marine boundary layer, Nature, 397, 572–573, 1999.; Axelson, H., Galle, B., Gustavson, K., Ragnarsson, P., and Rudin, M.: A transmitting/receiving telescope for DOAS-measurements using retroreflektor technique., Techn. Dig. Ser., 4, 641–644, 1990.; Bale, C. S. E., Ingham, T., Commane, R., Head, D. E., and Bloss, W. J.: Novel measurements of atmospheric iodine species by resonance fluorescence, J. A...

Read More
  • Cover Image

Measurements of Pollution in the Troposphere (Mopitt) Validation T...

By: P. Novelli; T. Campos; L. K. Emmons; M. N. Deeter; D. P. Edwards; J. C. Gille; G. Sachse; P. Nédélec

Description: National Center for Atmospheric Research, Boulder, CO, USA. Comparisons of aircraft measurements of carbon monoxide (CO) to the retrievals of CO using observations from the Measurements of Pollution in The Troposphere (MOPITT) instrument onboard the Terra satellite are presented. Observations made as part of the NASA INTEX-B and NSF MIRAGE field campaigns during March–May 2006 are used to validate the MOPITT CO retrievals, along with routine samples from...

Deeter, M. N., Emmons, L. K., Francis, G. L., et al.: Operational carbon monoxide retrieval algorithm and selected results for the MOPITT instrument, J. Geophys. Res., 108, 4399, doi:10.1029/2002JD003186, 2003.; Deeter, M. N., Emmons, L. K., Edwards, D. P., Gille, J. C., and Drummond, J. R.: Vertical resolution and information content of CO profiles retrieved by MOPITT, Geophys. Res. Lett., 31, L15112, doi:10.1029/2004GL020235, 2004.; Deeter, M. N., Edwards, D. P., and G...

Read More
  • Cover Image

Spatial Variability of Pops in European Background Air : Volume 10...

By: K. Breivik; M. Schlabach; S. Eckhardt; A. Sweetman; K. C. Jones; A. K. Halse

Description: Norwegian Institute for Air Research (NILU), P.O. Box 100, 2027 Kjeller, Norway. Persistent organic pollutants (POPs) are recognized for their potential to create harmful effects in remote areas and several monitoring programs have been established which measure POPs in air. Active air sampling (AAS) has so far been the recommended method used under the EMEP (co-operative programme for monitoring and evaluation of the long-range transmiss...

Aas, W. and Breivik, K.: Heavy metals and POPs measurements, 2006 co-operative programme for monitoring and evaluation of long range transmission of air pollutants in Europe (EMEP), NILU, Kjeller, 2008.; Aas, W. and Breivik, K.: Heavy metals and POP measurements 2007, co-operative programm for monitoring and evaluation of long-range transmissions of air pollutants in Europe, NILU, KjellerO-95038/O-99050, 3–117, 2009.; Bailey, R. E.: Global hexachlorobenzene emissions, Ch...

Read More
 
1
|
2
|
3
Records: 1 - 20 of 45 - Pages: 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.