Columnar aerosol single‐scattering albedo and phase function retrieved from sky radiance over the ocean: Measurements of Saharan dust

Cattrall, Christopher; Carder, Kendall L.; Gordon, Howard R.

doi:10.1029/2002jd002497

Cited by 38 publications

(41 citation statements)

References 76 publications

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“…At λ=530 nm the SSA specified by Cattrall et al (2003) is about 0.96±0.2 in good agreement with our results. By comparing their and others retrieval results with SSA model results based on laboratory data of the complex refractive indices of bulk minerals they found that the remotely sensed values result in a significantly weaker dust absorption than model predictions.…”

Section: Discussionsupporting

confidence: 81%

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Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study

Linke¹,

Möhler²,

et al. 2006

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Abstract. In aerosol chamber experiments optical properties of resuspended mineral dust samples of defined size distributions were measured. Extinction coefficients (b ext ) and mass specific extinction cross sections (σ ext ) were determined for Saharan dust samples from different locations. The results for σ ext were not very sensitive to the type of dust and varied at λ=550 nm between 3.3±0.4 m 2 g −1 and 3.7±0.4 m 2 g −1 .The absorption coefficients (b abs ) and mass specific absorption cross sections (σ abs ) were determined with a novel multiwavelength photo-acoustic absorption spectrometer (PAS). The single scattering albedo was close to 1 (0.98 to 0.99) at 532 nm and 1064 nm, but significantly lower (0.63 to 0.76) at 266 nm. Additionally the chemical and mineralogical composition of the dust samples were analysed with special regard to the iron oxide phases hematite and goethite. At λ=266 nm the mineral dust sample without any detectable iron oxides showed a significantly higher SSA compared to the sample with a hematite content of 0.6 wt-%.

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Section: Discussionsupporting

confidence: 81%

“…Retrievals of remote sensing data by Cattrall et al (2003) from Saharan dust passages at Dry Tortugas, Florida revealed SSA values across the visible spectral range. At λ=530 nm the SSA specified by Cattrall et al (2003) is about 0.96±0.2 in good agreement with our results.…”

Section: Discussionmentioning

confidence: 99%

Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study

Linke¹,

Möhler²,

et al. 2006

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“…Thus, we wish to study the effect of maximum particle size in a dust size distribution on optical properties and forcing in order to simulate the cut-off problem. In this context we would like to note that independent remote sensing techniques, e.g., to derive micro-physical particle properties from radiometric radiation measurements at the ground surface (Dubovik et al, 2002), may lead to SSA in the visible range, which is significantly larger than dust SSA calculated with in-situ data (Cattrall et al, 2003). Obviously, current retrievals of dust properties have certain inaccuracies as recently demonstrated by Müller et al (2010).…”

Section: Introductionmentioning

confidence: 92%

On realistic size equivalence and shape of spheroidal Saharan mineral dust particles applied in solar and thermal radiative transfer calculations

Otto

Trautmann²,

Wendisch

2011

Atmos. Chem. Phys.

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Abstract. Realistic size equivalence and shape of Saharan mineral dust particles are derived from in-situ particle, lidar and sun photometer measurements during SAMUM-1 in Morocco (19 May 2006), dealing with measured sizeand altitude-resolved axis ratio distributions of assumed spheroidal model particles. The data were applied in optical property, radiative effect, forcing and heating effect simulations to quantify the realistic impact of particle nonsphericity. It turned out that volume-to-surface equivalent spheroids with prolate shape are most realistic: particle nonsphericity only slightly affects single scattering albedo and asymmetry parameter but may enhance extinction coefficient by up to 10 %. At the bottom of the atmosphere (BOA) the Saharan mineral dust always leads to a loss of solar radiation, while the sign of the forcing at the top of the atmosphere (TOA) depends on surface albedo: solar cooling/warming over a mean ocean/land surface. In the thermal spectral range the dust inhibits the emission of radiation to space and warms the BOA. The most realistic case of particle non-sphericity causes changes of total (solar plus thermal) forcing by 55/5 % at the TOA over ocean/land and 15 % at the BOA over both land and ocean and enhances total radiative heating within the dust plume by up to 20 %. Large dust particles significantly contribute to all the radiative effects reported. They strongly enhance the absorbing properties and forward scattering in the solar and increase predominantly, e.g., the total TOA forcing of the dust over land.

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“…Phys. from Saharan desert regions at 550 nm yielded a value of 0.97 ± 0.02 (Cattrall et al, 2003). Additionally, the wind roses in Figure 8 MSE is a key parameter that can be used to estimate the radiative forcing effects due to 15 atmospheric particles on global climate.…”

Section: Resultsmentioning

confidence: 99%

Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over Northwestern China

Wen¹,

Wang²

2017

Preprint

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Abstract.From 3 April to 16 May 2014, a ground-based mobile laboratory was deployed to measure the optical and microphysical properties of tropospheric aerosols near dust source regions in Wuwei, Zhangye, and Dunhuang along the Hexi Corridor over Northwestern China. This study is novel in that we not only captured natural mineral 5 dust near the Taklimakan and Badain Jaran desert regions but also characterized the properties of anthropogenic soil dust produced by agricultural cultivations (e.g., land planning, ploughing, and disking), especially during floating dust episodes. In this dust campaign, the aerosol scattering (absorption) coefficient ( "# and $# ), single scattering albedo ( ), scattering Ångström exponent (Å sp ), mass scattering efficiency 10 (MSE), and aerosol size distribution were observed at 5-min intervals. The results indicate that large differences were found between the optical and microphysical properties of anthropogenic and natural dust because of floating dust episodes and dust storms. The values of "# , $# and of PM 2.5 measured at 550 nm range from ~37-

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Columnar aerosol single‐scattering albedo and phase function retrieved from sky radiance over the ocean: Measurements of Saharan dust

Cited by 38 publications

References 76 publications

Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study

Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study

On realistic size equivalence and shape of spheroidal Saharan mineral dust particles applied in solar and thermal radiative transfer calculations

Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over Northwestern China

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