&lt;title&gt;Influence of the wind conditions on aerosol extinction in the sea and coastal atmosphere surface layer&lt;/title&gt;

Kaloshin, Gennady A.

doi:10.1117/12.723188

Cited by 3 publications

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“…In contrast, at low values of fetch X = 3 km (curves 2 and 4; coastal conditions), increasing wind speed U (from 3.5 to 15 m s −1 ), a considerable decrease in σ(λ) is observed in the spectral range Δλ = 0.2-12 µm. Kaloshin (2007) suggests a possible explanation for this effect.…”

Section: δR (µM)mentioning

confidence: 86%

“…Actually, for marine and coastal aerosols, the approximation is not correct for many reasons. For example, our calculations based on the MaexPro model have revealed important differences between aerosol extinction spectra computed from the partial (0.1-10 µm) and the complete range (Δr = 0.01-100 µm) of particle sizes (Kaloshin, 2007;Kaloshin and Matvienko, 2007;Kaloshin and Shishkin, 2009). Figure 3 demonstrates the optical activity of coastal aerosol particles for eight distinct particle size distributions, similar to the experimental ones detected by a typical aerosol counter.…”

Section: The Optical Activity Of Marine and Coastal Aerosol Particlesmentioning

confidence: 90%

“…The principal feature of the model is the parameterization of the amplitudes A i and the widths C i of the various modes as functions of fetch X and wind speed U. The approximation is based on the fit to the aerosol size distribution function (ASDF) observed in the Atlantic and Arctic oceans and the Mediterranean, Baltic and Norwegian seas (Kaloshin and Piazzola, 2004, 2006a, 2006bKaloshin, 2006Kaloshin, , 2007, A 1 = −2.5 × 10 4 ln(X/X 0 ) + 1.5 × 10 5 A 2 = 10 {(0.0296 ln(X/X 0 )−0.045)(U/U 0 )−0.385 ln(X/X 0 )+2.1675}…”

Section: The Microphysical Model Used In Maexpromentioning

confidence: 99%

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An Aerosol Model of the Marine and Coastal Atmospheric Surface Layer

Kaloshin

Grishin

2011

Atmosphere-Ocean

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We present a microphysical model for the surface layer marine and coastal atmospheric aerosols that is based on long-term observations of size distributions for 0.01-100 µm particles. The fundamental feature of the model is a parameterization of amplitudes and widths for aerosol modes of the aerosol size distribution function (ASDF) as functions of fetch and wind speed. The shape of ASDF and its dependence on meteorological parameters, height above sea level (H), fetch (X), wind speed (U) and relative humidity (RH), are investigated. At present, the model covers the ranges H = 0-25 m, U = 3-18 km s −1 , X ≤ 120 km and RH = 40-98%.The latest version of the Marine Aerosol Extinction Profiles model (MaexPro) is described and applied to the computation and analysis of the spectral profiles of aerosol extinction coefficients α(λ) in the wavelength band λ = 0.2-12 µm. MaexPro is based on the aforementioned aerosol model assuming spherically shaped aerosol particles and the well-known Mie theory.The spectral profiles of α(λ) calculated by MaexPro are in good agreement with observational data and the numerical results obtained from the Navy Aerosol Model (NAM) and the Advanced Navy Aerosol Model (ANAM). Moreover, MaexPro was found to be an accurate and reliable tool for investigating the optical properties of atmospheric aerosols.RÉSUMÉ [Traduit par la rédaction] Nous présentons un modèle microphysique pour les aérosols atmosphériques marins et côtiers de la couche de surface, basé sur les observations à long terme des distributions granulométriques pour les particules de 0,01-100 µm. La caractéristique fondamentale du modèle est une paramétrisation des amplitudes et des largeurs pour les modes d'aérosols de la fonction de distribution granulométrique des aérosols (ASDF) comme des fonctions du fetch et de la vitesse du vent. Nous étudions la forme de l'ASDF et sa dépendance à l'égard des paramètres météorologiques : hauteur au-dessus du niveau de la mer (H), fetch (X), vitesse du vent (U) et humidité relative (HR). À ce moment-ci, le modèle couvre les intervalles H = 0 -25 m, U = 3 -18 km s −1 , X ≤ 120 km et HR = 40 -98 %.Nous décrivons la dernière version du modèle Marine Aerosol Extinction Profiles (MaexPro) et l'appliquons pour le calcul et l'analyse des profils spectraux des coefficients d'extinction α(λ) dans la bande de longueurs d'onde λ = 0,2-12 µm. MaexPro est basé sur le modèle d'aérosols mentionné ci-dessus pour des particules d'aérosol de forme sphérique et la théorie bien connue de Mie.Les profils spectraux de α(λ) calculés par MaexPro s'accordent bien avec les données d'observation et avec les résultats numériques obtenus du Navy Aerosol Model (NAM) et du Advanced Navy Aerosol Model (ANAM). Qui plus est, MaexPro s'est avéré un outil précis et fiable pour étudier les propriétés optiques des aérosols atmosphériques.

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Section: δR (µM)mentioning

confidence: 86%

Section: The Optical Activity Of Marine and Coastal Aerosol Particlesmentioning

confidence: 90%

Section: The Microphysical Model Used In Maexpromentioning

confidence: 99%

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An Aerosol Model of the Marine and Coastal Atmospheric Surface Layer

Kaloshin

Grishin

2011

Atmosphere-Ocean

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“…As opposed to it at small fetch (curves 2, 4, coastal conditions) X = 3 km, with the increase wind speed U from 3.5 up to 15 m/sec we observe decrease σ(λ) in spectral range of Δλ = 0.2-12 μm. This effect may be the next explanation 22 . At a small fetch (coastal conditions) with wind speed growing from 3.5 up to 15 m/sec the relative concentration of submicron aerosol grows with a simultaneous decrease of the aerosol coarse fraction.…”

Section: Influence Of Meteorological Parameters Variations On Spectramentioning

confidence: 93%

“…When wind speed rises up to ~ 7-8 m/s, there starts the foam-based mechanism of particle formation, when particles come off right from wave crests. At wind speed greater than 7-8 m/s, the relative concentration of coarse fraction grows essentially 22 .…”

Section: Influence Of Meteorological Parameters Variations On Spectramentioning

confidence: 96%

Forecasting of aerosol extinction of the sea and coastal atmosphere surface layer

Kaloshin

2010

Ocean Sensing and Monitoring II

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The focus of our study is the extinction and optical effects due to aerosol in a specific coastal region. The aerosol microphysical model of the marine and coastal atmosphere surface layer is considered. The model is made on the basis of the long-term experimental data received at researches of aerosol sizes distribution function (dN/dr) in the band particles sizes in 0.01 -100 µk. The model is developed by present time for the band of heights is 0 -25 m. Bands of wind speed is 3 -18 km/s, sizes fetch is up to 120 km, RH = 40 -98 %. Key feature of model is parameterization of amplitude and width of the modes as functions of fetch and wind speed. In the paper the dN/dr behavior depending at change meteorological parameters, heights above sea level, fetch (X), wind speed (U) and RH is show.On the basis of the developed model with usage of Mie theory for spheres the description of last version of developed code MaexPro (Marine Aerosol Extinction Profiles) for spectral profiles of aerosol extinction coefficients α(λ) calculations in the wavelength band, equal λ = 0.2 -12 µm is presented. The received results are compared models NAN and ANAM.Also α(λ) profiles for various wind modes (combinations X and U) calculated by MaexPro code are given. The calculated spectrums of α(λ) profiles are compared with experimental data of α(λ) received by a transmission method in various geographical areas.

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Aerosol Impact on Remote Sensing in the Coastal Atmosphere Surface Layer

Kaloshin

2007

Oceans 2007

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<title>Influence of the wind conditions on aerosol extinction in the sea and coastal atmosphere surface layer</title>

Cited by 3 publications

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An Aerosol Model of the Marine and Coastal Atmospheric Surface Layer

An Aerosol Model of the Marine and Coastal Atmospheric Surface Layer

Forecasting of aerosol extinction of the sea and coastal atmosphere surface layer

Aerosol Impact on Remote Sensing in the Coastal Atmosphere Surface Layer

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