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  • Articles  (1,422)
  • Latest Papers from Table of Contents or Articles in Press  (1,422)
  • 2015-2019  (1,422)
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  • Geosciences  (1,422)
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  • Articles  (1,422)
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  • Latest Papers from Table of Contents or Articles in Press  (1,422)
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  • 2015-2019  (1,422)
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  • Geosciences  (1,422)
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  • 1
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    Simulating secondary organic aerosol from anthropogenic and biogenic precursors: comparison to outdoor chamber experiments, effect of oligomerization on SOA formation and reactive uptake of aldehydes (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Simulating secondary organic aerosol from anthropogenic and biogenic precursors: comparison to outdoor chamber experiments, effect of oligomerization on SOA formation and reactive uptake of aldehydes〈/b〉〈br〉 Florian Couvidat, Marta G. Vivanco, and Bertrand Bessagnet〈br〉 Atmos. Chem. Phys., 18, 15743-15766, https://doi.org/10.5194/acp-18-15743-2018, 2018〈br〉 Several new parameterizations and mechanisms for SOA formation are developed based on available experimental results. To evaluate the parameterizations, a box model was developed to simulate SOA formation from monoterpenes and aromatics in the environmental chamber EUPHORE. This box model takes oligomerization, nonideality of the aerosol, multiphase partitioning, aging, vapor wall losses and particle-phase diffusion into account. All these phenomena are rarely taken into account together.
    Print ISSN: 1680-7316
    Electronic ISSN: 1680-7324
    Topics: Geosciences
    Published by Copernicus on behalf of The European Geosciences Union (EGU).
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  • 2
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    Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone〈/b〉〈br〉 Germar Bernhard and Boyan Petkov〈br〉 Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2018-1048,2018〈br〉 〈b〉Manuscript under review for ACP〈/b〉 (discussion: open, 0 comments)〈br〉 Solar radiation at ultraviolet, visible, and infrared wavelengths was measured during the total solar eclipse of 21 August 2017. Data were used to study the wavelength-dependent changes of solar radiation at Earth's surface and to validate parameterizations of solar limb darkening (LD), which describes the change of the Sun's brightness between its center and its edge. The study highlights the importance of the LD effect when calculating total ozone and aerosol optical depth during an eclipse.
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  • 3
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    Particle number size distribution and new particle formation under the influence of biomass burning at a high altitude background site at Mt. Yulong (3410 m), China (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Particle number size distribution and new particle formation under the influence of biomass burning at a high altitude background site at Mt. Yulong (3410 m), China〈/b〉〈br〉 Dongjie Shang, Min Hu, Jing Zheng, Yanhong Qin, Zhuofei Du, Mengren Li, Jingyao Fang, Jianfei Peng, Yusheng Wu, Sihua Lu, and Song Guo〈br〉 Atmos. Chem. Phys., 18, 15687-15703, https://doi.org/10.5194/acp-18-15687-2018, 2018〈br〉 Biomass burning (BB) activities have a great impact on the particle number size distribution in the upper troposphere of the Tibetan Plateau (TP), which could affect regional and global climate. We found that the cloud condensation nuclei concentration was 2–8 times higher during BB influenced periods than during clean periods on the TP. An unexpectedly low new particle formation frequency was found in clean atmosphere on the TP, due to low concentrations of anthropogenic precursors, i.e., SO〈sub〉2〈/sub〉.
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  • 4
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    Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites〈/b〉〈br〉 Meng Si, Victoria E. Irish, Ryan H. Mason, Jesús Vergara-Temprado, Sarah J. Hanna, Luis A. Ladino, Jacqueline D. Yakobi-Hancock, Corinne L. Schiller, Jeremy J. B. Wentzell, Jonathan P. D. Abbatt, Ken S. Carslaw, Benjamin J. Murray, and Allan K. Bertram〈br〉 Atmos. Chem. Phys., 18, 15669-15685, https://doi.org/10.5194/acp-18-15669-2018, 2018〈br〉 Using the concentrations of ice-nucleating particles (INPs) and total aerosol particles measured at three coastal marine sites, the ice-nucleating ability of aerosol particles on a per number basis and a per surface-area basis were determined as a function of size. The ice-nucleating ability was strongly dependent on size, with larger particles being more efficient. This type of information can help determine the sources of INPs and constrain the future modelling of INPs and mixed-phase clouds.
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  • 5
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    Insights into the morphology of multicomponent organic/inorganic aerosols from molecular dynamics simulations (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Insights into the morphology of multicomponent organic/inorganic aerosols from molecular dynamics simulations〈/b〉〈br〉 Katerina S. Karadima, Vlasis G. Mavrantzas, and Spyros N. Pandis〈br〉 Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2018-1098,2018〈br〉 〈b〉Manuscript under review for ACP〈/b〉 (discussion: open, 0 comments)〈br〉 We explore the morphologies of multicomponent nanoparticles through atomistic molecular dynamics simulations under atmospherically relevant conditions. Phase separation is predicted for almost all simulated nanoparticles either between organics and inorganics or between hydrophobic and hydrophilic constituents. Three main particle types were identified: organic islands at the surface, inorganic core-organic shell morphologies, and complex structures with hydrophobic and hydrophilic domains.
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  • 6
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    Trends in air pollutants and health impacts in three Swedish cities over the past three decades (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Trends in air pollutants and health impacts in three Swedish cities over the past three decades〈/b〉〈br〉 Henrik Olstrup, Bertil Forsberg, Hans Orru, Mårten Spanne, Hung Nguyen, Peter Molnár, and Christer Johansson〈br〉 Atmos. Chem. Phys., 18, 15705-15723, https://doi.org/10.5194/acp-18-15705-2018, 2018〈br〉 This article analyzes the health effects caused by changes in air pollution concentrations during the period of 1990–2015 in Stockholm, Gothenburg, and Malmö: the three largest cities in Sweden. The air pollutants that have been measured and analyzed are NO〈sub〉〈i〉x〈/i〉〈/sub〉, NO〈sub〉2〈/sub〉, O〈sub〉3〈/sub〉, and PM〈sub〉10〈/sub〉. NO〈sub〉〈i〉x〈/i〉〈/sub〉 and NO〈sub〉2〈/sub〉 exhibit decreasing trends during this period, with beneficial effects on public health. An overall conclusion is that public health can largely benefit from reduced air pollution levels.
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  • 7
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    Relaxation times of Arctic mixed-phase clouds to short-term aerosol perturbations under different surface forcings (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Relaxation times of Arctic mixed-phase clouds to short-term aerosol perturbations under different surface forcings〈/b〉〈br〉 Gesa K. Eirund, Anna Possner, and Ulrike Lohmann〈br〉 Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2018-1076,2018〈br〉 〈b〉Manuscript under review for ACP〈/b〉 (discussion: open, 0 comments)〈br〉 Low-level mixed-phase cloud (MPC) properties can be highly affected by the ambient aerosol concentration, especially in pristine environments as the Arctic. However, by employing high resolution model simulations we find that the effect of short-term aerosol perturbations on Arctic MPCs is efficiently attenuated with time. A substantial fraction of the aerosol is transported out of the boundary layer, which appears to inhibit any long-term impact of time-limited pollution events on Arctic MPCs.
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  • 8
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    Additional global climate cooling by clouds due to ice crystal complexity (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Additional global climate cooling by clouds due to ice crystal complexity〈/b〉〈br〉 Emma Järvinen, Olivier Jourdan, David Neubauer, Bin Yao, Chao Liu, Meinrat O. Andreae, Ulrike Lohmann, Manfred Wendisch, Greg M. McFarquhar, Thomas Leisner, and Martin Schnaiter〈br〉 Atmos. Chem. Phys., 18, 15767-15781, https://doi.org/10.5194/acp-18-15767-2018, 2018〈br〉 Using light diffraction it is possible to detect microscopic features within ice particles that have not yet been fully characterized. Here, this technique was applied in airborne measurements, where it was found that majority of atmospheric ice particles have features that significantly change the way ice particles interact with solar light. The microscopic features make ice-containing clouds more reflective than previously thought, which could have consequences for predicting our climate.
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  • 9
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    Effective radiative forcing in the aerosol–climate model CAM5.3-MARC-ARG (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Effective radiative forcing in the aerosol–climate model CAM5.3-MARC-ARG〈/b〉〈br〉 Benjamin S. Grandey, Daniel Rothenberg, Alexander Avramov, Qinjian Jin, Hsiang-He Lee, Xiaohong Liu, Zheng Lu, Samuel Albani, and Chien Wang〈br〉 Atmos. Chem. Phys., 18, 15783-15810, https://doi.org/10.5194/acp-18-15783-2018, 2018〈br〉 Anthropogenic emissions of aerosol particles likely cool the climate system. We investigate the uncertainty in the strength of the cooling effect by exploring the representation of aerosols in a global climate model. We conclude that the specific representation of aerosols in global climate models has important implications for climate modelling. Important factors include the representation of aerosol mixing state, size distribution, and optical properties.
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  • 10
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    Accounting for the effects of non-ideal minor structures on the optical properties of black carbon aerosols (2018)
    Copernicus
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    Publication Date: 2018
    Description: 〈b〉Accounting for the effects of non-ideal minor structures on the optical properties of black carbon aerosols〈/b〉〈br〉 Shiwen Teng, Chao Liu, Martin Schnaiter, Rajan K. Chakrabarty, and Fengshan Liu〈br〉 Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2018-1102,2018〈br〉 〈b〉Manuscript under review for ACP〈/b〉 (discussion: open, 0 comments)〈br〉 This study introduces a parameter 〈q〉volume variation〈/q〉 to quantify and unify five different minor structures of black carbon (BC) aerosol, and develops an empirical relation to account for their effects on BC optical properties. The generalized correction obtained can be easily used for modeling optical properties of aggregates with non-ideal structures from those of ideal ones, and to be valuable for interpretation of measurements and practical modeling that requires large amount of simulations.
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