Aerosol light scattering and condensation nuclei measurements at Barrow, Alaska

Bodhaine, Barry A.; Harris, Joyce M.; Herbert, Gary A.

doi:10.1016/0004-6981(81)90344-9

Cited by 63 publications

(28 citation statements)

References 10 publications

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“…We find that successful simulation of the observed seasonal variation of Arctic AOD in the model is contingent on accounting for the observed seasonal shift in sulfate aerosol size [Bodhaine et al, 1981;Quinn et al, 2002;Engvall et al, 2008]. An initial simulation using fixed aerosol optical properties from GEOS-Chem [Drury et al, 2010]-i.e., a lognormal distribution with a geometric mean radius of 70 nm for sulfate-overestimated the observed Arctic AODs in summer by a factor of 2.…”

Section: 1002/2013jd020996mentioning

confidence: 99%

Annual distributions and sources of Arctic aerosol components, aerosol optical depth, and aerosol absorption

et al. 2014

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Radiative forcing by aerosols and tropospheric ozone could play a significant role in recent Arctic warming. These species are in general poorly accounted for in climate models. We use the GEOS-Chem global chemical transport model to construct a 3-D representation of Arctic aerosols and ozone that is consistent with observations and can be used in climate simulations. We focus on 2008, when extensive observations were made from different platforms as part of the International Polar Year. Comparison to aircraft, surface, and ship cruise observations suggests that GEOS-Chem provides in general a successful year-round simulation of Arctic black carbon (BC), organic carbon (OC), sulfate, and dust aerosol. BC has major fuel combustion and boreal fire sources, OC is mainly from fires, sulfate has a mix of anthropogenic and natural sources, and dust is mostly from the Sahara. The model is successful in simulating aerosol optical depth (AOD) observations from Aerosol Robotics Network stations in the Arctic; the sharp drop from spring to summer appears driven in part by the smaller size of sulfate aerosol in summer. The anthropogenic contribution to Arctic AOD is a factor of 4 larger in spring than in summer and is mainly sulfate. Simulation of absorbing aerosol optical depth (AAOD) indicates that non-BC aerosol (OC and dust) contributed 24% of Arctic AAOD at 550 nm and 37% of absorbing mass deposited to the snow pack in 2008. Open fires contributed half of AAOD at 550 nm and half of deposition to the snowpack.

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Section: 1002/2013jd020996mentioning

confidence: 99%

Annual distributions and sources of Arctic aerosol components, aerosol optical depth, and aerosol absorption

et al. 2014

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“…Ground-based measurements from the Zeppelin station, Svalbard, and Point Barrow, USA showed that the aerosol loading undergoes a systematic change from spring to summer (Bodhaine et al, 1981;Bodhaine, 1989;Quinn et Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Changes in aerosol properties during spring-summer period in the Arctic troposphere

Engvall

Krejčí²,

Ström³

et al. 2008

Atmos. Chem. Phys.

100

139

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Abstract. The change in aerosol properties during the transition from the more polluted spring to the clean summer in the Arctic troposphere was studied. A six-year data set of observations from Ny-Ålesund on Svalbard, covering the months April through June, serve as the basis for the characterisation of this time period. In addition four-day-back trajectories were used to describe air mass histories. The observed transition in aerosol properties from an accumulationmode dominated distribution to an Aitken-mode dominated distribution is discussed with respect to long-range transport and influences from natural and anthropogenic sources of aerosols and pertinent trace gases. Our study shows that the air-mass transport is an important factor modulating the physical and chemical properties observed. However, the airmass transport cannot alone explain the annually repeated systematic and rather rapid change in aerosol properties, occurring within a limited time window of approximately 10 days. With a simplified phenomenological model, which delivers the nucleation potential for new-particle formation, we suggest that the rapid shift in aerosol microphysical properties between the Arctic spring and summer is mainly driven by the incoming solar radiation in concert with transport of precursor gases and changes in condensational sink.

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“…While these assumptions would seem to be fairly plausible, they imply an aerosol with a single-scatter albedo on the order of 0.61. This is smaller than that of the external mixture used in the model calculations above and smaller than that deduced from the surface measurements of Rosen et al (1981) and Bodhaine et al (1981). The use of the internal mixture in the model leads to a reduction in the aerosol extinction optical depth from 0.31 to 0.18, but causes essentially no change in the value of Ta.…”

Section: B) Broad Spectral Bandpass Radiometermentioning

confidence: 74%

“…To compute the heating rates produced by the absorption of solar radiation, we extended the narrow-band spectral measurements to all solar wavelengths using the following procedure: An approximate aerosol model, consistent with ground-based data on Arctic haze (Heintzenberg et al, 1981;Heintzenberg, 1980; 1981; Bodhaine et al, 1981) was constructed. The aerosol was assumed to be an external mixture of sulfate and carbon and had a single-scattering albedo of 0.8 at 0.5 pm.…”

Section: Experimental Concepts and Measurementsmentioning

confidence: 99%