World Library  

 
  • Cover Image

Technical Note: a New Coupled System for Global-to-regional Downsc...

By: M. Heimann; C. Gerbig; C. Rödenbeck; K. Trusilova

Description: Max-Planck Institute for Biogeochemistry, Hans-Knoell Str. 10, 07745 Jena, Germany. We introduce a global-to-regional nesting scheme for atmospheric transport models that are used for simulating concentrations of green house gases from globally distributed surface fluxes. The coupled system of the regional Stochastic Time-Inverted Lagrangian Transport (STILT) model and the global atmospheric transport model (TM3) is designed to resolve atmospheric trace...

Cundari, V., Colombo, T. and Ciattaglia, L.: 13 Years of atmospheric carbon-dioxide measurements at Mt-Cimone station, Italy, Nuovo Cimento C, 18(1), 33–47, 1995.; Derwent, R. G., Ryall, D. B., Manning, A., Simmonds, P. G., O'Doherty, S., Biraud, S. et al.: Continuous observations of carbon dioxide at Mace Head, Ireland from 1995 to 1999 and its net European ecosystem exchange, Atmos. Environ., 36(17), 2799–2807, 2002.; Gerbig, C., Körner, S., and Lin, J. C.: Vertical mi...

Read More
  • Cover Image

First Direct Observation of the Atmospheric Co2 Year-to-year Incre...

By: H. Bovensmann; O. Schneising; J. P. Burrows; J. Notholt; M. Buchwitz

Description: Institute of Environmental Physics (IUP), University of Bremen FB1, Bremen, Germany. The reliable prediction of future atmospheric CO2 concentrations and associated global climate change requires an adequate understanding of the CO2 sources and sinks. The sparseness of the existing surface measurement network limits current knowledge about the global distribution of CO2 surface fluxes. The retrieval of the CO2...

Aben, I., Hasekamp, O., and Hartmann, W.: Uncertainties in the space-based measurements of CO2 columns due to scattering in the Earth's atmosphere, J. Quant. Spectrosc. Rad. Transfer, 104, 450–459, 2006.; Aumann, H. H., Gregorich, D., and Gaiser, S.: AIRS hyper-spectral measurements for climate research: Carbon dioxide and nitrous oxide effects, Geophys. Res. Lett., 32, L05806, doi:10.1029/2004GL021784, 2005.; Barkley, M. P., Frieß, U. and Monks, P. S.: Measur...

Read More
  • Cover Image

Sensitivity of Aerosol Concentrations and Cloud Properties to Nucl...

By: R. Makkonen; H. Järvinen; J. Feichter; H. Kokkola; K. E. J. Lehtinen; V.-m. Kerminen; M. Kulmala; H. Korhonen; U. Lohmann; S. Järvenoja; A. Laaksonen; P. Räisänen; A. Asmi; R. Bennartz

Description: Department of Physics, University of Helsinki, 00014, Helsinki, Finland. The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce observed nucleation rates in the lower troposphere. A simple and computationally efficient model for biogenic secondary organic aerosol (BSOA) formation was implemented. Here we study t...

Baker, M. B. and Peter, T.: Small-scale cloud processes and climate, Nature, 451, 299–300, 2008.; Aalto, P., Hämeri, K., Becker, E., Weber, R., Salm, R., Mäkelä, J. M., Hoell, C., O'Dowd, C. D., Karlsson, H., Hansson, H.-C., Väkevä, M., Koponen, I. K., Buzorius, G., and Kulmala, M.: Physical characterization of aerosol particles during nucleation events, Tellus B, 53(4), 344–358, doi:10.1034/j.1600-0889.2001.530403.x, 2001.; Bennartz, R.: Global assessment of marine boun...

Read More
  • Cover Image

Polar Stratospheric Cloud Observations by Mipas on Envisat: Detect...

By: L. J. Kramer; L. R. Poole; M. Müller; J. J. Remedios; R. Spang; M. D. Fromm; G. Baumgarten; P. Konopka

Description: ICG I, Research Centre Jülich, Germany. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT has made extensive measurements of polar stratospheric clouds (PSCs) in the northern hemisphere winter 2002/2003. A PSC detection method, based on a ratio of radiances (the cloud index), has been implemented for MIPAS and is validated in this study with respect to ground based lidar and space borne occultation measurements. A very goo...

Read More
  • Cover Image

Effects of Various Meteorological Conditions and Spatial Emission ...

By: J. Keller; J. Dommen; A. S. H. Prévôt; N. Bärtsch-ritter

Description: Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, CH-5232 Villigen PSI, Switzerland. The three-dimensional photochemical model UAM-V is used to investigate the effects of various meteorological conditions and of the coarseness of emission inventories on the ozone concentration and ROG/NOx limitation of the ozone production in the Po Basin in the northern part of Italy. As a base case, the high ozone episode with up to 200 p...

Read More
  • Cover Image

Can a Global Model Chemical Mechanism Reproduce No, No2, and O3 Me...

By: P. J. Young; J. D. Lee; S. Moller; X. Yang; G. D. Carver; J. A. Pyle; D. Stewart; C. N. Hewitt; R. C. Pike; C. E. Reeves; P. Misztal; B. Langford

Description: Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK. A cross-platform field campaign, OP3, was conducted in the state of Sabah in Malaysian Borneo between April and July of 2008. Among the suite of observations recorded, the campaign included measurements of NOx and O3–crucial outputs of any model chemistry mechanism. We describe the measurements of these species m...

Archibald, A., Jenkin, M., and Shallcross, D.: An isoprene mechanism intercomparison, Atmos. Environ., doi:10.1016/j.atmosenv.2009.09.016, in press, 2009.; Arnold, S. R., Chipperfield, M. P., and Blitz, M. A.: A three-dimensional model study of the effect of new temperature-dependent quantum yields for acetone photolysis, J. Geophys. Res., 110, D22305, doi:10.1029/2005JD005998, 2005.; Blake, R. S., Monks, P. S., and Elli...

Read More
  • Cover Image

Interannual-to-decadal Variability of the Stratosphere During the ...

By: D. Brunner; M. Schraner; P. Kenzelmann; E. Rozanov; W. Schmutz; T. Peter; A. M. Fischer; G. E. Bodeker; S. Brönnimann; C. Schnadt Poberaj; T. Egorova; A. Lustenberger; B. P. Luo

Description: Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland. Interannual-to-decadal variability in stratospheric ozone and climate have a number of common sources, such as variations in solar irradiance, stratospheric aerosol loading due to volcanic eruptions, El Niño Southern Oscillation variability and the quasi-biennial oscillation (QBO). Currently available data records as well as model simulations addressing stratospheric chemical climat...

% vor jede Referenz Andrews, D. G., Holton, J. R., and Leovy, C. B.: Middle Atmosphere Dynamics, Academic Press, 1987.; % vor jede Referenz 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.; % vor jede Referenz Bodeker, G. E., Shiona,...

Read More
  • Cover Image

Actinic Flux and O1D Photolysis Frequencies Retrieved from Spectra...

By: M. Blumthaler; A. Kazantzidis; A. F. Bais; C. Topaloglou; D. Balis; B. Schallhart; S. Kazadzis

Description: Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece. The results of two methods retrieving actinic flux and ozone photolysis frequencies from measurements of irradiance with a Brewer MKIII spectroradiometer are investigated in this paper. The first method uses actinic flux retrieved from irradiance measurements by the use of known formulas while the second is an empirical method converting irradiance to ozone photolysis frequ...

Read More
  • Cover Image

Highly Time-resolved Chemical Characterization of Atmospheric Subm...

By: M. R. Canagaratna; L.-y. He; L.-w. Zeng; N. L. Ng; M. Hu; X.-g. Liu; T. Zhu; D. R. Worsnop; Y. Sun; Y.-h. Zhang; X.-f. Huang; J. T. Jayne; L. Xue; Q. Zhang

Description: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China. As part of Campaigns of Air Quality Research in Beijing and Surrounding Region–2008 (CAREBeijing-2008), an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) was deployed in urban Beijing to characterize submicron aerosol particles during the time of 2008 Beijing ...

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, 2007.; Aiken, A. C., DeCarlo, P. F., Kroll, J. H., {et al.}: O/C and OM/OC ratios of primary, secondary, and ambient organic aerosols with high-resolution time-of-flight aerosol mass spectrometry, Environ. Sci. Technol., 42, 4478–4485, 2008.; Aiken, A. C., Salcedo, D., Cubison, M. J., Huffman, J. A...

Read More
  • Cover Image

Source Apportionment of Pm10 in a North-western Europe Regional Ur...

By: C. Piot; O. Favez; E. Leoz-garziandia; A. Waked; L. Y. Alleman; E. Verlinden; J.-e. Petit; B. Golly; T. Delaunay; J.-l. Besombes; J.-l. Jaffrezo

Description: Université Grenoble 1-CNRS, LGGE UMR5183, 38041 Grenoble, France. In this work, the source of ambient particulate matter (PM10) collected over a one year period at an urban background site in Lens (France) were determined and investigated using a~Positive Matrix Factorization receptor model (US EPA PMF v3.0). In addition, a Potential Source Contribution Function (PSCF) was performed by means of the Hysplit v4.9 model to assess prevailing geo...

Alleman, L. Y., Lamaison, L., Perdrix, E., Robache, A., and Galloo, J.-C.: PM10 metal concentrations and source identification using positive matrix factorization and wind sectoring in a French industrial zone, Atmos. Res., 96, 612–625, doi:10.1016/j.atmosres.2010.02.008, 2010.; Almeida, S. M., Pio, C. A., Freitas, M. C., Reis, M. A., and Trancoso, M. A.: Source apportionment of fine and coarse parti...

Read More
  • Cover Image

Emergence of a Linear Tracer Source from Air Concentration Measure...

By: J.-p. Issartel

Description: Centre d’Enseignement et de Recherche en Environnement Atmosphérique, unité mixte Ecole Nationale des Ponts et Chaussées – Electricité de France, France Projet CLIME, équipe mixte Institut National de Recherche en. The measurement of atmospheric concentrations by a monitoring network is potentially a useful tool investigated for the identification of the widespread sources of trace species. The paper addresses inversion strategies using base functions mul...

Read More
  • Cover Image

Microphysical and Radiative Characterization of a Subvisible Midle...

By: A. Ehrlich; A. Dörnbrack; M. Wendisch; G. Mioche; O. Jourdan; V. Shcherbakov; J.-f. Gayet; A. Lampert; C. Ritter

Description: Alfred Wegener Institute for Polar and Marine Research, 14473 Potsdam, Germany. During the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign, which was conducted in March and April 2007, an optically thin ice cloud was observed south of Svalbard at around 3 km altitude. The microphysical and radiative properties of this particular subvisible midlevel cloud were investigated with complementary remote sensing and in situ instrume...

Baran, A.J., and Labonnote L.-C.: On the reflection and polarisation properties of ice cloud, J. Quant. Spectrom. Rad. T., 100, 41–54, 2006.; Ansmann, A., Wandinger, U., Riebesell, M., Weitkamp, C., and Michaelis, W.: Independent measurement of extinction and backscatter profiles in cirrus clouds by using a combined Raman elastic-backscatter lidar, Appl. Opt., 31, 33, 7113–7131, 1992.; Baran, A. J. and Francis, P. N.: On the radiative properties of cirrus cloud at solar ...

Read More
  • Cover Image

Source-receptor Relationships Between East Asian Sulfur Dioxide Em...

By: L. W. Horowitz; D. L. Mauzerall; J. Liu

Description: Woodrow Wilson School of Public and Int. Affairs, Princeton Univ., Princeton, NJ, USA. We analyze the effect of varying East Asian (EA) sulfur emissions on sulfate concentrations in the Northern Hemisphere, using a global coupled oxidant-aerosol model (MOZART-2). We conduct a base and five sensitivity simulations, in which sulfur emissions from each continent are tagged, to establish the source-receptor (S-R) relationship between EA sulfur emissions and...

Berglen, T. F., Berntsen, T. K., Isaksen, I. S. A., and Sundet, J. K.: A global model of the coupled sulfur/oxidant chemistry in the troposphere: The sulfur cycle, J. Geophys. Res.-Atmos., 109, D19310, doi:10.1029/2003JD003948, 2004.; Brasseur, G. P., Orlando, J. J., Tyndall, G. S., and National Center for Atmospheric Research (US): Atmospheric chemistry and global change, Topics in environmental chemistry, Oxford University Press, New York, xviii, 654 pp., 1999.; Carlso...

Read More
  • Cover Image

Sunset–sunrise Difference in Solar Occultation Ozone Measurements ...

By: T. Sakazaki; K. A. Walker; J. M. Zawodny; M. Shiotani; D. Kinnison; M. Suzuki; M. McHugh

Description: Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan. This paper contains a comprehensive investigation of the sunset–sunrise difference (SSD; i.e., the sunset-minus-sunrise value) of the ozone mixing ratio in the latitude range of 10° S–10° N. SSD values were determined from solar occultation measurements based on data obtained from the Stratospheric Aerosol and Gas Experiment (SAGE) II, the Halogen Occultation Experimen...

Beaver, G. M., Gordley, L., and Russell III, J. M.: Halogen Occultation Experiment (HALOE) altitude registration of atmospheric profile measurements: lessons learned and improvements made during the data validation phase, Proc. SPIE 2266, P. Soc. Photo-Opt. Ins., 266–280, doi:10.1117/12.187564, 1994.; Bernath, P. F., McElroy, C. T., Abrams, M. C., Boone, C. D., Butler, M., Camy-Peyret, C., Carleer, M., Clerbaux, C., Coheur,...

Read More
  • Cover Image

Evaluation of Recently-proposed Secondary Organic Aerosol Models f...

By: S. Madronich; P. Tulet; R. M. Volkamer; C. D. Cappa; J. L. Jimenez; Q. Zhang; I. M. Ulbrich; K. Dzepina; P. J. Ziemann

Description: Cooperative Institute for Research in the Environmental Sciences (CIRES), Univ. of Colorado at Boulder, Boulder, CO, USA. Recent field studies have found large discrepancies in the measured vs. modeled SOA mass loadings in both urban and regional polluted atmospheres. The reasons for these large differences are unclear. Here we revisit a case study of SOA formation in Mexico City described by Volkamer et al. (2006), during a photochemically active period...

An, W. J., Pathak, R. K., Lee, B. H., and Pandis, S. N.: Aerosol volatility measurement using an improved thermodenuder: Application to secondary organic aerosol, J. Aerosol Sci., 38, 305–314, 2007.; Aumont, B., Szopa, S., and Madronich, S.: Modelling the evolution of organic carbon during its gas-phase tropospheric oxidation: development of an explicit model based on a self generating approach, Atmos. Chem. Phys., 5, 2497–2517, 2005.; Bahreini, R., Keywood, M. D., Ng, N...

Read More
  • Cover Image

Key Aspects of Stratospheric Tracer Modeling Using Assimilated Win...

By: E. Meijer; B. Bregman; R. Scheele

Description: Royal Netherlands Meteorological Institute, P.O. Box 201, 3730 AE, De Bilt, The Netherlands. This study describes key aspects of global chemistry-transport models and their impact on stratospheric tracer transport. We concentrate on global models that use assimilated winds from numerical weather predictions, but the results also apply to tracer transport in general circulation models. We examined grid resolution, numerical diffusion, air parcel dispersio...

Andrews, A., Boering, K., Daube, B., Wofsy, S., Loewenstein, M., Jost, H., Podolske, J., Webster, C., Herman, R., Scott, D., Flesh, G., Moyer, E., Elkins, J., Dutton, G., Hurst, D., Moore, F., Ray, E., Romanshkin, P., and Strahan, S.: Mean ages of stratospheric air derived from in situ observations of CO2, CH4, and N2O, J. Geophys. Res., 106, 32 295–32 314, 2001.; Berthet, G., Huret, N., Lefévre, F., Moreau, G., Robert, C., Chartier, M., ...

Read More
  • Cover Image

Dimensions and Aspect Ratios of Natural Ice Crystals : Volume 15, ...

By: Y. P. Hong; G. M. McFarquhar; R. P. Lawson; S.-s. Lee; Q. Mo; J. Um; C. H. Jung

Description: Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA. During the 2006 Tropical Warm Pool International Cloud Experiment (TWP-ICE) in the tropics, the 2008 Indirect and Semi-Direct Aerosol Campaign (ISDAC) in the Arctic, and the 2010 Small PARTicles In CirrUS (SPARTICUS) campaign at mid-latitudes, high-resolution images of ice crystals were recorded by a Cloud Particle Imager at temperatures ...

Auer, A. H. and Veal, D. L.: The dimension of ice crystals in natural clouds, J. Atmos. Sci., 27, 919–926, 1970.; Arnott, W. P., Dong, Y. Y., and Hallet, J.: Role of small ice crystals in radiative properties of cirrus: A case study, FIRE II, November 22, 1991, J. Geophys. Res., 99, 1371–81, 1994.; aufm Kampe, H. J., Weickmann, H. K., and Kelly, J. J.: The influence of temperature on the shape of ice crystals growing at water saturation, J. Meteorol., 8, 168–174, 1951.; ...

Read More
  • Cover Image

Global Trends in Visibility: Implications for Dust Sources : Volum...

By: N. M. Mahowald; J. Feddema; J. A. Ballantine; N. Ramankutty

Description: National Center for Atmospheric Research, Boulder Colorado, USA. There is a large uncertainty in the relative roles of human land use, climate change and carbon dioxide fertilization in changing desert dust source strength over the past 100 years, and the overall sign of human impacts on dust is not known. We used visibility data from meteorological stations in dusty regions to assess the anthropogenic impact on long term trends in desert dust emissions...

Ballantine, J.-A. C., Okin, G. S., Prentiss, D. E., and Roberts, D. A.: Mapping landforms in North Africa using continental scale unmixing of MODIS imagery, Remote Sens. Environ., 97, 470–483, 2005.; Bonan, G., Levis, S., Kergoat, L., and Oleson, K.: Landscapes as patches of plant functional types: An integrating concept for climate and ecosystem models, Global Biogeochem. Cycles, 16, 5.1–5.23, 2002.; Chen, M., Xie, P., Janowiak, J., and Arkin, P.: Global land precipitat...

Read More
  • Cover Image

Improvements in Aod Retrieval from Geostationary Measurements Over...

By: J. Kim; T. F. Eck; W. Kim; U. Jeong; J. H. Lim; M. Kim; B. Holben; S. Lee; C. K. Song

Description: Department of Atmosphere Sciences/IEAA BK 21 plus, Yonsei University, Seoul, Korea. An aerosol model optimized for East Asia is improved by applying inversion data from both long-term monitoring of the Aerosol Robotic Network (AERONET) sun photometer and the Distributed Regional Aerosol Gridded Observation Networks (DRAGON)-Asia campaign from 2012. This model plays an important role in retrieving accurate aerosol optical depth (AOD) from satellite-based ...

Castanho, A. D. D. A., Martins, J. V., and Artaxo, P.: MODIS aerosol optical depth Retrievals with high spatial resolution over an urban area using the critical reflectance, J. Geophys. Res.-Atmos., 113, D02201, doi:10.1029/2007jd008751, 2008.; Deroubaix, A., Martiny, N., Chiapello, I., and Marticorena, B.: Suitability of OMI aerosol index to reflect mineral dust surface conditions: preliminary application for studying t...

Read More
  • Cover Image

Combined Effects of Surface Conditions, Boundary Layer Dynamics an...

By: J. L. Jimenez; P. Kabat; L. N. Ganzeveld; C. C. Van Heerwaarden; R. H. H. Janssen; D. K. Farmer; J. Vilà-guerau De Arellano; I. Mammarella

Description: Earth System Science and Climate Change, Wageningen University and Research Centre, Wageningen, The Netherlands. We study the combined effects of land surface conditions, atmospheric boundary layer dynamics and chemistry on the diurnal evolution of biogenic secondary organic aerosol in the atmospheric boundary layer, using a model that contains the essentials of all these components. First, we evaluate the model for a case study in Hyytiälä, Finland, a...

Bowman, F. M. and Karamalegos, A. M.: Estimated effects of composition on secondary organic aerosol mass concentrations, Environ. Sci. Technol., 36, 2701–2707, doi:10.1021/es015717g, 2002.; Cappa, C. D. and Jimenez, J. L.: Quantitative estimates of the volatility of ambient organic aerosol, Atmos. Chem. Phys., 10, 5409-5424, doi:10.5194/acp-10-5409-2010, 2010.; de Bruin...

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.