An Eulerian Limited-Area Atmospheric Transport Model

Robertson, Lennart; Langner, Joakim; Engardt, Magnuz

doi:10.1175/1520-0450(1999)038<0190:aelaat>2.0.co;2

Cited by 216 publications

(135 citation statements)

References 33 publications

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“…The AOP computations were coupled to size-resolved aerosol mass mixing ratios computed with the 3-D Multiplescale Atmospheric Transport and CHemistry (MATCH) modelling system (Robertson et al, 1999;Foltescu et al, 2005;Andersson et al, 2007). We employed a version of the model which computes aerosol mass mixing ratios in four different size classes.…”

Section: Methodsmentioning

confidence: 99%

Modelling the optical and radiative properties of freshly emitted light absorbing carbon within an atmospheric chemical transport model

Kahnert

2010

Atmos. Chem. Phys.

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Abstract. Light absorbing carbon (LAC) aerosols have a complex, fractal-like aggregate structure. Their optical and radiative properties are notoriously difficult to model, and approximate methods may introduce large errors both in the interpretation of aerosol remote sensing observations, and in quantifying the direct radiative forcing effect of LAC. In this paper a numerically exact method for solving Maxwell's equations is employed for computing the optical properties of freshly emitted, externally mixed LAC aggregates. The computations are performed at wavelengths of 440 nm and 870 nm, and they cover the entire size range relevant for modelling these kinds of aerosols. The method for solving the electromagnetic scattering and absorption problem for aggregates proves to be sufficiently stable and fast to make accurate multiple-band computations of LAC optical properties feasible. The results from the electromagnetic computations are processed such that they can readily be integrated into a chemical transport model (CTM), which is a prerequisite for constructing robust observation operators for chemical data assimilation of aerosol optical observations. A case study is performed, in which results obtained with the coupled optics/CTM model are employed as input to detailed radiative transfer computations at a polluted European location. It is found that the still popular homogeneous sphere approximation significantly underestimates the radiative forcing at top of atmosphere as compared to the results obtained with the aggregate model. Notably, the LAC forcing effect predicted with the aggregate model is less than that one obtains by assuming a prescribed mass absorption cross section for LAC.

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Section: Methodsmentioning

confidence: 99%

Modelling the optical and radiative properties of freshly emitted light absorbing carbon within an atmospheric chemical transport model

Kahnert

2010

Atmos. Chem. Phys.

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“…The literature consensus is that HfO 2 films have a gap of 5.6-6.0 eV, although the proof and methodology of this remains debated. [16][17][18][19][20] We obtain this value from our results by defining the edge as the 2 level of the Gaussian-modeled band tail states. Although there is no strong theoretical argument to include what we are calling band edge defect states in defining the "real" gap, they may be considered as contributing to an "effective" band gap (see Fig.…”

Section: F Comparison Of Theory and Experiment: Band Tail Statesmentioning

confidence: 99%

Band alignment issues related to HfO2∕SiO2∕p-Si gate stacks

Sayan

Emge

Garfunkel

et al. 2004

Journal of Applied Physics

103

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The valence and conduction band densities of states for the HfO 2 / SiO 2 / Si structure are determined by soft x-ray photoemission and inverse photoemission. First principles calculations are used to help in assigning valence band maxima and conduction band minima. The energies of defect states at the band edges are estimated by comparing the theoretical and experimental results. Determinations of the local surface potentials before and after a forming gas anneal are used to help determine the possible location of the charge in the film.

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“…To determine future air quality over a city we use a dedicated version of the threedimensional off-line CTM MATCH [7], operated over the city of concern. The domain is flexible and set by the user − typically 100×100 km 2 with 50-100 grids in each horizontal direction.…”

Section: Air Quality Downscaling Modelmentioning

confidence: 99%

“…These air quality results stem from simulations with the regional dispersion model MATCH [7], forced by meteorological data from RCA3 simulating different climate change realizations. In order to include a realistic temporal evolution of European primary and precursor emissions, the MATCH model has used the RCP4.5 emission scenario [8] to assess air quality impact of the ECHAM5 A1B and HADLEY A1B climate scenarios.…”

Section: Introductionmentioning

confidence: 99%

Web Services for Incorporation of Air Quality and Climate Change in Long-Term Urban Planning for Europe

Engardt

Johansson

Gidhagen

2011

IFIP Advances in Information and Communication Technology

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Abstract. Planning for sustainable cities requires the inclusion of environmental aspects like air quality. Within a planning perspective of 20-30 years, there are various factors influencing future air quality:Worldwide: Climate change may change global background pollution levels and it will affect the atmospheric chemistry.Europe: Many efforts are taken to reduce emissions of air pollutants and climate forcing agents. These efforts will contribute to changes in the levels of air pollution reaching European cities.Locally: City populations will grow. The population growth, together with the design of transportation and energy production systems, influence the city's own contribution to air pollution.The web-service presented allows end-users in an arbitrary European city to consider these factors impact on air quality. It also includes tools for visualization and standards for easy connection to existing local model systems in the cities.

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An Eulerian Limited-Area Atmospheric Transport Model

Cited by 216 publications

References 33 publications

Modelling the optical and radiative properties of freshly emitted light absorbing carbon within an atmospheric chemical transport model

Modelling the optical and radiative properties of freshly emitted light absorbing carbon within an atmospheric chemical transport model

Band alignment issues related to HfO2∕SiO2∕p-Si gate stacks

Web Services for Incorporation of Air Quality and Climate Change in Long-Term Urban Planning for Europe

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