Development of a global aerosol model using a two‐dimensional sectional method: 1. Model design

Matsui, Hitoshi

doi:10.1002/2017ms000936

Cited by 63 publications

(75 citation statements)

References 130 publications

(175 reference statements)

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“…Several approaches to treat the condensation of organic molecules onto nuclei mode particles in models have been applied, the most popular being the Volatility Basis Set (VBS) (Donahue et al, 2011) approach (Glotfelty et al, 2017;Matsui, 2017;Pierce et al, 2011), although other methods are in active use (Yu, 2011). The Kelvin effect is considered for each volatility bin.…”

Section: Nuclei Mode Aerosol Microphysicsmentioning

confidence: 99%

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate

et al. 2019

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New particle formation (NPF) represents the first step in the complex processes leading to formation of cloud condensation nuclei. Newly formed nanoparticles affect human health, air quality, weather, and climate. This review provides a brief history, synthesizes recent significant progresses, and outlines the challenges and future directions for research relevant to NPF. New developments include the emergence of state‐of‐the‐art instruments that measure prenucleation clusters and newly nucleated nanoparticles down to about 1 nm; systematic laboratory studies of multicomponent nucleation systems, including collaborative experiments conducted in the Cosmics Leaving Outdoor Droplets chamber at CERN; observations of NPF in different types of forests, extremely polluted urban locations, coastal sites, polar regions, and high‐elevation sites; and improved nucleation theories and parameterizations to account for NPF in atmospheric models. The challenges include the lack of understanding of the fundamental chemical mechanisms responsible for aerosol nucleation and growth under diverse environments, the effects of SO2 and NOx on NPF, and the contribution of anthropogenic organic compounds to NPF. It is also critical to develop instruments that can detect chemical composition of particles from 3 to 20 nm and improve parameterizations to represent NPF over a wide range of atmospheric conditions of chemical precursor, temperature, and humidity.

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Section: Nuclei Mode Aerosol Microphysicsmentioning

confidence: 99%

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate

et al. 2019

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“…We performed a set of numerical experiments with the CAM5chem/ATRAS2 global aerosol model 14 to quantify changes in the simulated global aerosol fields due solely to differences in the model's treatment of environmental supersaturation (SS) and the associated nucleation scavenging process in precipitating clouds. The base simulation was performed with the default CAM5-chem/ ATRAS2 parameterization scheme, in which both the determination of the SS value and the nucleation scavenging process are treated differently between grid-scale and sub-grid-scale cloud types.…”

Section: Sensitivity Of the Global Bc Distribution To In-cloud Supersmentioning

confidence: 99%

“…We conducted global model simulations using the Community Atmosphere Model version 5 (CAM5-chem) 47 with the Aerosol Two-dimensional bin module for foRmation and Aging Simulation version 2 (CAM5-chem/ ATRAS2), 14,48 in which the nucleation scavenging scheme was modified as described below. The stand-alone version of CAM5 (FC5 compset) in Community Earth System Model version 1.2.0 was used with a horizontal resolution of 1.9°latitude × 2.5°longitude and 30 vertical layers from the surface to~40 km.…”

Section: Model Simulationsmentioning

confidence: 99%

“…Nine aerosol species (sulfate, nitrate, ammonium, dust, sea salt, primary and secondary organic aerosol, BC, and water) were treated in the model. The model considered gas-phase chemistry, 50 condensation/evaporation of inorganic and organic species, 14 coagulation, 51 nucleation, 52 aerosol activation 13 and evaporation 53 from clouds, aerosol formation in clouds, 54 dry and wet deposition, 55 and aerosol optical properties. 14 Aerosol particles were resolved with 12 size bins from 0.001 to 10 μm (dry diameter), as in the ATRAS-d model.…”

Section: Model Simulationsmentioning

confidence: 99%

“…Recently developed global-scale atmospheric models coupled with aerosol microphysical modules explicitly 14 or implicitly 15,16 assume that only aerosol particles in clouds with SS c less than the modelled (or prescribed) SS lsd value are subject to nucleation scavenging and efficient rainout. In these models, the timescale for transforming fresh high-SS c hydrophobic particles (SS c > SS lsd ) into low-SS c hydrophilic particles (SS c < SS lsd ) can change drastically depending on the modelled (or prescribed) SS lsd value.…”

Section: Introductionmentioning

confidence: 99%

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Observational constraint of in-cloud supersaturation for simulations of aerosol rainout in atmospheric models

et al. 2019

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Quantitative simulation of an aerosol's lifecycle by regional-scale and global-scale atmospheric models is mandatory for unbiased analysis and prediction of aerosol radiative forcing and climate change. Globally, aerosol deposition is dominated by the rainout process, which is mostly triggered by activation of aerosols to liquid droplets in supersaturated domains of precipitating clouds. However, the actual environmental supersaturation value that aerosols experience in precipitating clouds is difficult for models to predict, and it has never been constrained by observations; as a result, there is large uncertainty in atmospheric aerosol simulations. Here, by a particle-tracer analysis of 37 rainfall events in East Asia, near the largest source region of anthropogenic aerosols in the northern hemisphere, we observed that the environmental supersaturation actually experienced by the removed aerosols in precipitating clouds averaged 0.08 ± 0.03% and ranged from 0.03 to 0.2%. Simulations by a mixing-state-resolved global aerosol model showed that the simulated long-range transport efficiency and global atmospheric burden of black carbon aerosols can be changed by a factor of two or three as a result of a change in the environmental supersaturation in precipitating clouds within just 0.08 ± 0.03%. This result is attributable to the fact that the sensitivity of an aerosol's rainout efficiency to environmental supersaturation is higher for the less-aged black carbon concentrated near source regions. Our results suggest that observational constraints of environmental supersaturation in precipitating clouds, particularly near source regions, are of fundamental importance for accurate simulation of the atmospheric burden of black carbon and other aerosols.npj Climate and Atmospheric Science (2019) 2:6 ; https://doi.

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Development of a global aerosol model using a two‐dimensional sectional method: 2. Evaluation and sensitivity simulations

Matsui

Mahowald

2017

J Adv Model Earth Syst

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Global aerosol simulations are conducted by using the Community Atmosphere Model version 5 with the Aerosol Two‐dimensional bin module for foRmation and Aging Simulation version 2 (CAM5‐chem/ATRAS2) which was developed in part 1. The model uses a two‐dimensional (2‐D) section representation with 12 size bins from 1 nm to 10 μm and 8 black carbon (BC) mixing state bins, and it can calculate detailed aerosol processes and their interactions with radiation and clouds. The simulations have similar or better agreement with aerosol observations (e.g., aerosol optical depth, absorption aerosol optical depth (AAOD), aerosol number concentrations, mass concentrations of each species) compared with the simulations using the Modal Aerosol Model with three modes. Sensitivity simulations show that global mean AAOD is reduced by 15% by resolving BC mixing state as a result of two competing effects (optical and lifetime effects). AAOD is reduced by 10–50% at low and midlatitudes in the 2‐D sectional simulation because BC absorption enhancement by coating species is reduced by resolving pure BC, thinly coated BC, and BC‐free particles in the model (optical effect). In contrast, AAOD is enhanced by 5–30% at high‐latitudes because BC concentrations are enhanced by 40–200% over the regions by resolving less CCN active particles (lifetime effect). The simulations also suggest a model which resolves more than 3 BC categories (including BC‐free particles) is desirable to calculate the optical and lifetime effects accurately. The complexity of aerosol representation is shown to be especially important for simulations of BC and CCN concentrations and AAOD.

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Development of a global aerosol model using a two‐dimensional sectional method: 1. Model design

Cited by 63 publications

References 130 publications

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate

Observational constraint of in-cloud supersaturation for simulations of aerosol rainout in atmospheric models

Development of a global aerosol model using a two‐dimensional sectional method: 2. Evaluation and sensitivity simulations

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