A computationally-efficient secondary organic aerosol module for three-dimensional air quality models

Liu, P.; Zhang, Y.

doi:10.5194/acp-8-3985-2008

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…Hygroscopicity is computed with the Zdanovskii-Stokes-Robinson (ZSR) method as used by Meng et al [1998]. However, H 2 O was optimized to be computationally efficient by using the parameters of Liu and Zhang [2008] for the method of Newton-Raphson presented in Pun et al [2002] and by removing useless but time consuming data in the call of UNIFAC. It includes also more organic species than AEC (coming mainly from isoprene and primary SVOC oxidation) and accounts for processes that had not been identified when AEC was developed (oligomerization, impact of NO X on the chemistry of SOA formation).…”

Section: Overviewmentioning

confidence: 99%

A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis

Couvidat¹,

Debry²,

Sartelet³

et al. 2012

J. Geophys. Res.

105

181

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A secondary organic aerosol (SOA) model, the Hydrophilic/Hydrophobic Organic model (H2O), is presented and evaluated over Europe. H2O uses surrogate organic molecules to represent the myriad of SOA species and distinguishes two kinds of surrogate species: hydrophilic species (which condense preferentially into an aqueous phase) and hydrophobic species (which condense only into an organic phase). These surrogate species are formed from the oxidation in the atmosphere of volatile organic compounds. H2O includes several important processes, including the effect of nitrogen oxides (NOX) on SOA formation, the dissociation of organic acids in an aqueous phase, the oligomerization of aldehydes, the non‐ideality of the particle phase and the hygroscopicity of organics. Concentrations of organic aerosols were simulated over Europe from July 2002 to July 2003 for comparison with measurements of the European Monitoring Evaluation Program (EMEP). In H2O, primary organic aerosols (POA) are considered as semi‐volatile organic compounds (SVOC) present in both the gas phase and the particle phase. Taking into account the gas‐phase fraction of SVOC increases significantly organic PM concentrations, particularly in winter, in better agreement with observations. The impacts on organic aerosol formation of ideality, of the choice of the parameterization for isoprene SOA formation, and of the OM/OC ratio of the model were also investigated. Assuming ideality in H2O was found to lead to a small decrease in OM. Compared to a two‐product parameterization, the parameterization of Couvidat and Seigneur [2011] for SOA formation from isoprene oxidation leads to a significant increase in isoprene SOA by taking into account their hydrophilic properties and suggests that most models may currently underestimate isoprene SOA.

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Section: Overviewmentioning

confidence: 99%

A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis

Couvidat¹,

Debry²,

Sartelet³

et al. 2012

J. Geophys. Res.

105

181

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show abstract

“…New schemes to simulate atmospheric SOA formation are being developed continuously (e.g. Griffin et al, 2005, Tulet et al, 2006Pun and Seigneur, 2007;Liu and Zhang, 2008), yet only a few global models are able to simulate SOA formation explicitly (e.g. Chung and Seinfeld, 2002;Tsigaridis et al, 2003;Guillaume et al, 2007;Hoyle et al, 2007;Goto et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

Makkonen¹,

Asmi²,

Korhonen³

et al. 2008

Preprint

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Abstract. 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 lower troposphere. A simple and computationally efficient model for biogenic secondary organic aerosol (BSOA) formation was implemented. We studied the sensitivity of aerosol and cloud droplet number concentrations (CDNC) to these additions. Activation-type nucleation significantly increases aerosol number concentrations in the boundary layer. Increased particle number concentrations have a significant effect also on cloud droplet number concentrations and therefore on cloud properties. We performed calculations with activation nucleation coefficient values of 2×10-7 s−1, 2×10-6 s-1 and 2×10-5 s−1 to evaluate the sensitivity to this parameter. For BSOA we have used yields of 0.025, 0.07 and 0.15 to estimate the amount of monoterpene oxidation products available for condensation. The dynamic SOA scheme induces large regional changes to size distribution of organic carbon, and therefore affects particle optical properties and cloud droplet number concentrations locally. Comparison with satellite observation shows that activation-type nucleation significantly decreases the differences between observed and modeled values of cloud top CDNC.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

et al. 2009

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Abstract. 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 the sensitivity of the aerosol and cloud droplet number concentrations (CDNC) to these additions. Activationtype nucleation significantly increases aerosol number concentrations in the boundary layer. Increased particle number concentrations have a significant effect also on cloud droplet number concentrations and therefore on cloud properties. We performed calculations with activation nucleation coefficient values of 2×10 −7 s −1 , 2×10 −6 s −1 and 2×10 −5 s −1 to evaluate the sensitivity to this parameter. For BSOA we have used yields of 0.025, 0.07 and 0.15 to estimate the amount of monoterpene oxidation products available for condensation. The hybrid BSOA formation scheme induces large regional changes to size distribution of organic carbon, and therefore affects particle optical properties and cloud droplet number concentrations locally. Although activation-type nuCorrespondence to: R. Makkonen (risto.makkonen@helsinki.fi) cleation improves modeled aerosol number concentrations in the boundary layer, the use of a global activation coefficient generally leads to overestimation of aerosol number. Overestimation can also arise from underestimation of primary emissions.

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A computationally-efficient secondary organic aerosol module for three-dimensional air quality models

Cited by 5 publications

References 49 publications

A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis

A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

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A computationally-efficient secondary organic aerosol module for three-dimensional air quality models

Cited by 5 publications

References 49 publications

A hydrophilic/hydrophobic organic (H2O) aerosol model: Development, evaluation and sensitivity analysis

A hydrophilic/hydrophobic organic (H2O) aerosol model: Development, evaluation and sensitivity analysis

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model

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A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis

A hydrophilic/hydrophobic organic (H²O) aerosol model: Development, evaluation and sensitivity analysis