Distribution and direct radiative forcing of carbonaceous and sulfate aerosols in an interactive size‐resolving aerosol–climate model

Kim, Dongchul; Wang, Chen; Ekman, Annica M. L.; Barth, M. C.; Rasch, P.

doi:10.1029/2007jd009756

Cited by 90 publications

(166 citation statements)

References 120 publications

(221 reference statements)

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“…Many global models enhance light absorption by BC particles due to coating by secondary components (e.g., Jacobson, 2001;Chung and Seinfeld, 2002;Kim et al, 2008). The present results, indicating a neutral or negative relationship between the SAC and the amount of particle mass loading, suggest that light absorption by BC may not be enhanced with increasing processing in the atmosphere.…”

Section: Relationship Between Sac and Particle Mass Loadingmentioning

confidence: 45%

Observations of OM/OC and specific attenuation coefficients (SAC) in ambient fine PM at a rural site in central Ontario, Canada

et al. 2010

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Abstract. Ambient particulate matter (PM) samples were collected on quartz filters at a rural site in central Ontario during an intensive study in 2007. The concentrations of organic carbon (OC), pyrolysis organic carbon (POC), and elemental carbon (EC) were determined by thermal analysis. The concentrations are compared to the organic aerosol mass concentration (OM) measured with an Aerodyne C-ToF Aerosol Mass Spectrometer (AMS) and to the particle absorption coefficient (b asp ) obtained from a Radiance Research Particle Soot Absorption Photometer (PSAP). The total organic mass to organic carbon ratios (OM/OC) and specific attenuation coefficients (SAC=b asp /EC) are derived. Proportionality of the POC mass with the oxygen mass in the aerosols estimated from the AMS offers a potential means to estimate OM/OC from thermal measurements only. The mean SAC for the study is 3.8±0.3 m 2 g −1 . It is found that the SAC is independent of or decrease with increasing particle mass loading, depending on whether or not the data are separated between aerosols dominated by more recent anthropogenic input and aerosols dominated by longer residence time or biogenic components. There is no evidence to support an enhancement of light absorption by the condensation of secondary material to particles, suggesting that present model simulations built on such an assumption may overestimate atmospheric warming by BC.

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Section: Relationship Between Sac and Particle Mass Loadingmentioning

confidence: 45%

Observations of OM/OC and specific attenuation coefficients (SAC) in ambient fine PM at a rural site in central Ontario, Canada

et al. 2010

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“…sorption, the aerosol absorption optical depth (AAOD), is generally underestimated by models compared to values retrieved by AERONET (Bond et al, 2013;Koch et al, 2009;Kim et al, 2008;Klingmüller et al, 2014). The sources of discrepancy are not well understood.…”

Section: B V Scarnato Et Al: Optical Properties Internally Mixed Mmentioning

confidence: 99%

Perturbations of the optical properties of mineral dust particles by mixing with black carbon: a numerical simulation study

et al. 2015

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Abstract. Field observations show that individual aerosol particles are a complex mixture of a wide variety of species, reflecting different sources and physico-chemical transformations. The impacts of individual aerosol morphology and mixing characteristics on the Earth system are not yet fully understood. Here we present a sensitivity study on climaterelevant aerosols optical properties to various approximations. Based on aerosol samples collected in various geographical locations, we have observationally constrained size, morphology and mixing, and accordingly simulated, using the discrete dipole approximation model (DDSCAT), optical properties of three aerosols types: (1) bare black carbon (BC) aggregates, (2) bare mineral dust, and (3) an internal mixture of a BC aggregate laying on top of a mineral dust particle, also referred to as polluted dust.DDSCAT predicts optical properties and their spectral dependence consistently with observations for all the studied cases. Predicted values of mass absorption, scattering and extinction coefficients (MAC, MSC, MEC) for bare BC show a weak dependence on the BC aggregate size, while the asymmetry parameter (g) shows the opposite behavior. The simulated optical properties of bare mineral dust present a large variability depending on the modeled dust shape, confirming the limited range of applicability of spheroids over different types and size of mineral dust aerosols, in agreement with previous modeling studies. The polluted dust cases show a strong decrease in MAC values with the increase in dust particle size (for the same BC size) and an increase of the single scattering albedo (SSA). Furthermore, particles with a radius between 180 and 300 nm are characterized by a decrease in SSA values compared to bare dust, in agreement with field observations. This paper demonstrates that observationally constrained DDSCAT simulations allow one to better understand the variability of the measured aerosol optical properties in ambient air and to define benchmark biases due to different approximations in aerosol parametrization.

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“…The model results have been compared with satellite, surface, and aircraft measurements. A good agreement between modeled and observed data is seen in most of these comparisons except for events clearly under influences of episodic heavy pollution plumes in subgrid scale that could not be well represented by the model (Kim et al, 2008). The AOD and AAOD of anthropogenic aerosols at each model grid are calculated by combining contributions from all the aerosol modes.…”

Section: Methodsmentioning

confidence: 99%

“…The calculation is done based on 3-year means of modeled results. The new addition to the work of Kim et al (2008) is the adoption of a monthly-varied biofuel emission of BC and OC. The BC biofuel inventory is from the monthly BC biomass burning data of the Global Emission Inventory Activity (GEIA) (http://www.geiacenter.org).…”

Section: Methodsmentioning

confidence: 99%

“…The AOD and AAOD of anthropogenic aerosols used in this study is derived based on the results of an aerosol-climate model (Kim et al, 2008) developed from the Community Atmospheric Model version 3 (CAM3), a component of the Community Climate System Model (CCSM) of National Center of Atmospheric Research (NCAR) . The model includes seven anthropogenic aerosol types (modes), separated by size, chemical composition, and mixing state; namely 3 external sulfate (nucleation, Aitken, and accumulation), one each of external BC and organic carbon (OC), one internal mixture with BC as the core and sulfate as the shell (MBS), and one internal mixture of OC and sulfate (MOS).…”

Section: Methodsmentioning

confidence: 99%

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Particulate absorption of solar radiation: anthropogenic aerosols vs. dust

2009

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Abstract. Particulate solar absorption is a critical factor in determining the value and even sign of the direct radiative forcing of aerosols. The heating to the atmosphere and cooling to the Earth's surface caused by this absorption are hypothesized to have significant climate impacts. We find that anthropogenic aerosols play an important role around the globe in total particulate absorption of solar radiation. The global-average anthropogenic fraction in total aerosol absorbing optical depth exceeds 65% in all seasons. Combining the potentially highest dust absorption with the lowest anthropogenic absorption within our model range, this fraction would still exceed 47% in most seasons except for boreal spring (36%) when dust abundance reaches its peak. Nevertheless, dust aerosol is still a critical absorbing constituent over places including North Africa, the entire tropical Atlantic, and during boreal spring in most part of Eurasian continent. The equality in absorbing solar radiation of dust and anthropogenic aerosols appears to be particularly important over Indian subcontinent and nearby regions as well as North Africa.

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Distribution and direct radiative forcing of carbonaceous and sulfate aerosols in an interactive size‐resolving aerosol–climate model

Cited by 90 publications

References 120 publications

Observations of OM/OC and specific attenuation coefficients (SAC) in ambient fine PM at a rural site in central Ontario, Canada

Observations of OM/OC and specific attenuation coefficients (SAC) in ambient fine PM at a rural site in central Ontario, Canada

Perturbations of the optical properties of mineral dust particles by mixing with black carbon: a numerical simulation study

Particulate absorption of solar radiation: anthropogenic aerosols vs. dust

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