scholarly journals Predicting Littoral Zone Aerosol Optical Properties under a Sea Breeze Regime: Part II

2016 ◽  
Author(s):  
Adele L. Igel ◽  
Susan C. van den Heever ◽  
Jungmin Park ◽  
Sam Atwood ◽  
Sonia Kreidenweis
Keyword(s):  
Optical Properties ◽  
Littoral Zone ◽  
Sea Breeze ◽  
Aerosol Optical Properties

scholarly journals Impact of sea breeze on vertical structure of aerosol optical properties in Dunkerque, France

2011 ◽  
Vol 101 (4) ◽  
pp. 902-910 ◽  
Author(s):  
Neda Boyouk ◽  
Jean-François Léon ◽  
Hervé Delbarre ◽  
Patrick Augustin ◽  
Marc Fourmentin
Keyword(s):  
Optical Properties ◽  
Vertical Structure ◽  
Sea Breeze ◽  
Aerosol Optical Properties

scholarly journals Variability of aerosol optical properties in the Western Mediterranean Basin

2011 ◽  
Vol 11 (5) ◽  
pp. 14091-14125
Author(s):  
M. Pandolfi ◽  
M. Cusack ◽  
A. Alastuey ◽  
X. Querol
Keyword(s):  
Optical Properties ◽  
Sea Breeze ◽  
Single Scattering ◽  
Western Mediterranean ◽  
Aerosol Optical Properties ◽  
Air Masses ◽  
Aerosol Absorption ◽  
Western Mediterranean Basin ◽  
Aerosol Scattering ◽  
The Mean

Abstract. Aerosol light scattering, black carbon (BC) and particulate matter (PM) concentrations were measured at Montseny, a regional background site in the Western Mediterranean Basin (WMB) which is part of the European Supersite for Atmospheric Aerosol Research (EUSAAR). Off line analyses of 24 h PM filters collected with Hi-Vol instruments were performed for the determination of the main chemical components of PM. Measurements of BC were used to calculate the light absorption properties of atmospheric particles. Single Scattering Albedo (SSA) at 635 nm was estimated starting from aerosol scattering and absorption measurements, while Ångström exponents were calculated by means of the three wavelengths (450 nm, 525 nm, 635 nm) aerosol light scattering measurements from Nephelometer. Mean scattering and hemispheric backscattering coefficients (@ 635 nm) were 26.8 ± 23.3 Mm−1 and 4.3 ± 2.7 Mm−1, respectively and the mean aerosol absorption coefficient was 2.8 ± 2.2 Mm−1. Mean values of Single Scattering Albedo (SSA) and Ångström exponent (calculated from 450 nm to 635 nm) at MSY were 0.90 ± 0.05 and 1.2 ± 0.6, respectively. A clear relationship was observed between the PM1/PM10 and PM2.5/PM10 ratios as a function of the calculated Ångström exponents. Mass scattering cross sections for fine mass and sulfate at 635 nm were calculated in 2.8 ± 0.5 m2 g−1 and 11.8 ± 2.2 m2 g−1 respectively, while the mean aerosol absorption cross section was estimated around 10.4 ± 2.0 m2 g−1. The variability in aerosol optical properties in the WMB were largely explained by the origin and ageing of air masses over the measurement site. The sea breeze played an important role in transporting pollutants from the developed WMB coastlines towards inland rural areas, changing the optical properties of aerosols. Aerosol scattering and backscattering coefficients increased by around 40 % in the afternoon when the sea breeze was fully developed while the absorption coefficient increased by more than 100 % as a consequence of the increase in BC concentration at MSY observed under sea breeze circulation. The analysis of the Ångström (Å) exponent as a function of the origin the air masses revealed that polluted winter anticyclonic conditions and summer recirculation scenarios typical of the WMB led to an increase of fine particles in the atmosphere (Å = 1.4 ± 0.1) while the aerosol optical properties under Atlantic Advection episodes and Saharan dust outbreaks were clearly dominated by coarser particles (Å = 0.7 ± 0.3).

scholarly journals Variability of aerosol optical properties in the Western Mediterranean Basin

2011 ◽  
Vol 11 (15) ◽  
pp. 8189-8203 ◽  
Author(s):  
M. Pandolfi ◽  
M. Cusack ◽  
A. Alastuey ◽  
X. Querol
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Mediterranean Basin ◽  
Sea Breeze ◽  
Western Mediterranean ◽  
Aerosol Optical Properties ◽  
Air Masses ◽  
Aerosol Absorption ◽  
Western Mediterranean Basin ◽  
The Mean

Abstract. Aerosol light scattering, absorption and particulate matter (PM) concentrations were measured at Montseny, a regional background site in the Western Mediterranean Basin (WMB) which is part of the European Supersite for Atmospheric Aerosol Research (EUSAAR). Off line analyses of 24 h PM filters collected with Hi-Vol instruments were performed for the determination of the main chemical components of PM. Mean scattering and hemispheric backscattering coefficients (@ 635 nm) were 26.6±23.2 Mm−1 and 4.3±2.7 Mm−1, respectively and the mean aerosol absorption coefficient (@ 637 nm) was 2.8±2.2 Mm−1. Mean values of Single Scattering Albedo (SSA) and Ångström exponent (å) (calculated from 450 nm to 635 nm) at MSY were 0.90±0.05 and 1.3±0.5 respectively. A clear relationship was observed between the PM1/PM10 and PM2.5/PM10 ratios as a function of the calculated Ångström exponents. Mass scattering cross sections (MSC) for fine mass and sulfate at 635 nm were 2.8±0.5 m2 g−1 and 11.8±2.2 m2 g−1, respectively, while the mean aerosol absorption cross section (MAC) was 10.4±2.0 m2 g−1. The variability in aerosol optical properties in the WMB were largely explained by the origin and ageing of air masses over the measurement site. The MAC values appear dependent of particles aging: similar to the expected absorption cross-section for fresh emissions under Atlantic Advection episodes and higher under aerosol pollution episodes. The analysis of the Ångström exponent as a function of the origin the air masses revealed that polluted winter anticyclonic conditions and summer recirculation scenarios typical of the WMB led to an increase of fine particles in the atmosphere (å = 1.5±0.1) while the aerosol optical properties under Atlantic Advection episodes and Saharan dust outbreaks were clearly dominated by coarser particles (å = 1.0±0.4). The sea breeze played an important role in transporting pollutants from the developed WMB coastlines towards inland rural areas, changing the optical properties of aerosols. Aerosol scattering and backscattering coefficients increased by around 40 % in the afternoon when the sea breeze was fully developed while the absorption coefficient increased by more than 100 % as a consequence of the increase in the equivalent black carbon concentration (EBC) observed at MSY under sea breeze circulation.

Temporal and spatial variations of aerosol optical properties over the Korean peninsula during KORUS-AQ

2021 ◽  
pp. 118301
Author(s):  
Yongjoo Choi ◽  
Young Sung Ghim ◽  
Michal Segal Rozenhaimer ◽  
Jens Redemann ◽  
Samuel E. LeBlanc ◽  
...  
Keyword(s):  
Optical Properties ◽  
Korean Peninsula ◽  
Spatial Variations ◽  
Aerosol Optical Properties ◽  
Temporal And Spatial Variations ◽  
Temporal And Spatial

MODELING OF AEROSOL OPTICAL PROPERTIES AT AN INDIAN COASTAL SITE DURING THE 1999 INDOEX FIELD PHASE

2001 ◽  
Vol 32 ◽  
pp. 423-424
Author(s):  
S.C. ALFARO ◽  
L. GOMES ◽  
A. GAUDICHET ◽  
J.L. RAJOT ◽  
J.F. LEON ◽  
...  
Keyword(s):  
Optical Properties ◽  
Field Phase ◽  
Aerosol Optical Properties ◽  
Coastal Site

Aerosol optical properties and precipitable water vapor column in the atmosphere of Norway

2015 ◽  
Vol 54 (6) ◽  
pp. 1505 ◽  
Author(s):  
Dennis Muyimbwa ◽  
Øyvind Frette ◽  
Jakob J. Stamnes ◽  
Taddeo Ssenyonga ◽  
Yi-Chun Chen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Water Vapor ◽  
Precipitable Water ◽  
Precipitable Water Vapor ◽  
Aerosol Optical Properties
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