An improved representation of aerosol mixing state for air quality–weather interactions

Stevens, Robin; Ryjkov, Andrei; Majdzadeh, Mahtab; Dastoor, Ashu

doi:10.5194/acp-22-13527-2022

Cited by 5 publications

(4 citation statements)

References 117 publications

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“…Shifts in emissions, atmospheric chemistry, and meteorological conditions can lead to fluctuations in the mixing state of particles. These variations can have implications for their radiative properties, CCN activity, and health impacts [ 35 ]. In numerous ways, climate change can alter the physical and chemical properties of environmental particles, including their size distribution, composition, hygroscopicity, and mixing state.…”

Section: Particle Deposition In the Lungsmentioning

confidence: 99%

Climate change, air quality, and respiratory health: a focus on particle deposition in the lungs

Chang,

Lee,

Chang

et al. 2023

Annals of Medicine

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This review article delves into the multifaceted relationship between climate change, air quality, and respiratory health, placing a special focus on the process of particle deposition in the lungs. We discuss the capability of climate change to intensify air pollution and alter particulate matter physicochemical properties such as size, dispersion, and chemical composition. These alterations play a significant role in influencing the deposition of particles in the lungs, leading to consequential respiratory health effects. The review paper provides a broad exploration of climate change’s direct and indirect role in modifying particulate air pollution features and its interaction with other air pollutants, which may change the ability of particle deposition in the lungs. In conclusion, climate change may play an important role in regulating particle deposition in the lungs by changing physicochemistry of particulate air pollution, therefore, increasing the risk of respiratory disease development.

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Section: Particle Deposition In the Lungsmentioning

confidence: 99%

Climate change, air quality, and respiratory health: a focus on particle deposition in the lungs

Chang,

Lee,

Chang

et al. 2023

Annals of Medicine

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“…The Hadley-like Meridional Circulation test case is used to emphasize the solution of horizontal-vertical coupling (Ullrich et al, 2013). The tracer field consists of a single layer, which is deformed over the duration of 24 hours.…”

Section: Hadley-like Meridional Circulationmentioning

confidence: 99%

“…ECCC's air quality forecast model, GEM-MACH (Global Environmental Multiscale -Modelling Air quality and CHemistry) (Zhou et al, 2021;Stevens et al, 2022), is an in-line chemistry-meteorology model based on the GEM model. 70…”

Section: Introductionmentioning

confidence: 99%

Sweep Interpolation: A Fourth-Order Accurate Cost Effective Scheme in the Global Environmental Multiscale Model

Mortezazadeh,

Cossette,

Dastoor

et al. 2023

Preprint

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Abstract. The interpolation process is the most computationally expensive step of the semi-Lagrangian (SL) approach for solving advection which is commonly used in numerical weather prediction (NWP) models. It has a significant impact on the accuracy of the solution and can potentially be the most expensive part of model integration. The sweep algorithm, which was first described by Mortezazadeh and Wang (2017), performs SL interpolation with the same computational cost as a third order polynomial scheme but with the accuracy of a fourth order interpolation scheme. This improvement is achieved by using two 3rd-order backward and forward polynomial interpolation schemes in two consecutive time steps. In this paper, we present a new application of the sweep algorithm within the context of global forecasts produced with Environment Climate Change Canada’s Global Environmental Multiscale (GEM) model. Results show that the sweep interpolation scheme is computationally more efficient compared to a conventional fourth order polynomial scheme, especially evident for increasing number of several advected several passive tracers. An additional advantage of this new approach is that its implementation in a chemical and weather forecast models requires minimum modifications of the interpolation weighting coefficients. An analysis of the computational performance for a set of theoretical benchmarks as well as a global ozone forecast experiment show that up to 15 % reduction in total wall clock time is achieved. Forecasting experiments using the global version of the GEM model and the new interpolation show that the sweep interpolation can perform very well in predicting ozone distribution, especially in the tropopause region where transport processes play a significant role.

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“…The aerosol mixing state is a crucial physicochemical property of aerosol particles (Riemer et al, 2019), exerting a significant impact on their optical properties and cloud condensation nuclei (CCN) activity, affecting their impact on climate and the environment (Fierce et al, 2017;Riemer et al, 2019;Stevens et al, 2022). For instance, variations in the mixing state of black carbon (BC) particles can significantly alter their absorption and radiative effects (Bond et al, 2013;Lack et al, 2012;Moffet et al, 2016;Matsui et al, 2018;Peng et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Markedly different impacts of primary emissions and secondary aerosol formations on aerosol mixing states revealed by simultaneous measurements of CCNC, V/HTDMA and SP2

Tao

Luo²,

Xu³

et al. 2023

Preprint

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Abstract. The aerosol mixing state is a crucial physical-chemical property that affects their optical properties and cloud condensation nuclei (CCN) activity. Multiple techniques are commonly employed to determine aerosol mixing states for various applications, and comparisons between these techniques provide insights of the variations in aerosol chemical and physical properties. These techniques include size-resolved CCN activity measurements using a system with CCN counter (CCNC) coupled with a differential mobility analyzer (DMA), a Humidified/Volatility Tandem differential mobility analyzer (H/V-TDMA) which measures aerosol hygroscopicity/volatility distributions, and a single particle soot photometer (SP2) which directly quantifies black carbon (BC) mixing states. This study provides a first time intercomparisons of aerosol mixing state parameters obtained through simultaneous measurements of a DMA-CCNC, a H/VTDMA and a DMA-SP2. The impact of primary aerosols emissions and secondary aerosol formations on the aerosol mixing states and intercomparison results were analyzed. The results showed that differences in mixing state parameters measured by different techniques varied greatly under different conditions. The V-TDMA and DMA-SP2 measurements showed that the non-volatile population identified by the V-TDMA was mainly contributed by BC-containing aerosols. The HTDMA and DMA-SP2 measurements indicated that a substantial proportion of nearly hydrophobic aerosols were not contributed from BC-containing aerosols, but likely originated from fossil fuel combustion and biomass burning emissions. Synthesized comparison results between DMA-CCNC, HTDMA and DMA-SP2 measurements revealed that some of the nearly hydrophobic BC-free particles were CCN-inactive under supersaturated conditions, likely from fossil combustion emissions, while others were CCN-active under supersaturated conditions linked to biomass burning emissions. Fossil fuel combustion-emitted BC-containing aerosols tended to be more externally mixed with other aerosol compositions compared to those emitted from biomass burning activities. These results highlight significant disparities in the mixing states as well as physiochemical properties between aerosol originated from fossil fuel combustion and biomass burning. The formation of secondary nitrate and organic aerosols exerted significant impacts on variations in aerosol mixing states, generally enhancing aerosol hygroscopicity and volatility, while reducing differences in mixing state parameters derived from different techniques, resulting in a reduction in aerosol heterogeneity. The variations in BC-free particle number fractions showed that secondary aerosols tended to form more quickly on BC-free particles than on BC-containing particles. Further comparison of mixing state parameters revealed that the two resolved SOA factors in this study exhibited remarkably different physical properties, indicating that they were likely formed through different pathways. These findings suggest that intercomparisons among aerosol mixing states derived from different techniques can provide deeper insight into aerosol physical properties and how they are impacted by secondary aerosol formation, aiding the investigation of secondary aerosol formation pathways.

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An improved representation of aerosol mixing state for air quality–weather interactions

Cited by 5 publications

References 117 publications

Climate change, air quality, and respiratory health: a focus on particle deposition in the lungs

Climate change, air quality, and respiratory health: a focus on particle deposition in the lungs

Sweep Interpolation: A Fourth-Order Accurate Cost Effective Scheme in the Global Environmental Multiscale Model

Markedly different impacts of primary emissions and secondary aerosol formations on aerosol mixing states revealed by simultaneous measurements of CCNC, V/HTDMA and SP2

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