Size distribution and scattering phase function of aerosol particles retrieved from sky brightness measurements

Kaufman, Yoram J.; Gitelson, Anatoly A.; Karnieli, Arnon; Ganor, E.; Fraser, Robert S.; Nakajima, Teruyuki; Mattoo, S.; Holben, B. N.

doi:10.1029/94jd00229

Cited by 215 publications

(126 citation statements)

References 43 publications

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“…A β provides information about the size distribution of both spherical and non-spherical particles that takes account of the complex dependence of backscatter on particle component size, wavelength, and nonsphericity. A β > 2 indicates relatively smaller particles (radius ≤ 0.5 µm), and A β around zero indicates larger particles (radius ≥ 0.5 µm) (Kaufman et al, 1994;Schuster et al, 2006). For background stratospheric aerosols, A β is about 2.0 (Shibata et al, 1984;Hofmann et al, 2009); for cloud layers A β is about −0.2 to 0.0 (Kamei et al, 2006;Mona et al, 2012), and for volcanic ash A β is about 1.0 (Ansmann et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

et al. 2014

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Section: Discussionmentioning

confidence: 99%

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

et al. 2014

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“…While AOD provides the overall solar extinction effect of aerosols, α characterizes the AOD spectral variation, which is related to the aerosol median size (Kaufman et al, 1994). High α values indicate fine particle predominance, while low α values are related to coarse particles (Kaufman et al, 1994;Kim et al, 2011).…”

Section: Description Of Site and Aerosol Conditionsmentioning

confidence: 99%

Aerosol optical depth retrievals at the Izaña Atmospheric Observatory from 1941 to 2013 by using artificial neural networks

García

Cuevas

et al. 2016

Atmos. Meas. Tech.

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Abstract. This paper presents the reconstruction of a 73-year time series of the aerosol optical depth (AOD) at 500 nm at the subtropical high-mountain Izaña Atmospheric Observatory (IZO) located in Tenerife (Canary Islands, Spain). For this purpose, we have combined AOD estimates from artificial neural networks (ANNs) from 1941 to 2001 and AOD measurements directly obtained with a Precision Filter Radiometer (PFR) between 2003 and 2013. The analysis is limited to summer months (July-August-September), when the largest aerosol load is observed at IZO (Saharan mineral dust particles). The ANN AOD time series has been comprehensively validated against coincident AOD measurements performed with a solar spectrometer Mark-I (1984Mark-I ( -2009 and AERONET (AErosol RObotic NETwork) CIMEL photometers (2004)(2005)(2006)(2007)(2008)(2009) at IZO, obtaining a rather good agreement on a daily basis: Pearson coefficient, R, of 0.97 between AERONET and ANN AOD, and 0.93 between Mark-I and ANN AOD estimates. In addition, we have analysed the long-term consistency between ANN AOD time series and long-term meteorological records identifying Saharan mineral dust events at IZO (synoptical observations and local wind records). Both analyses provide consistent results, with correlations > 85 %. Therefore, we can conclude that the reconstructed AOD time series captures well the AOD variations and dust-laden Saharan air mass outbreaks on shortterm and long-term timescales and, thus, it is suitable to be used in climate analysis.

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“…This parameter represents the extinction of radiation at a certain wavelength that results from the presence of atmospheric aerosols. The Ångström exponent represents the slope of the wavelength dependence of the AOT in logarithmic coordinates: In the solar spectrum, the Ångström exponent AE is a good indicator of the size of the atmospheric particles determining the AOD: AE 440-870 >1 is mainly determined by fine mode, while AE <1 is largely determined by coarse mode (Kaufman et al, 1994). However, AE alone does not provide unambiguous information on the relative weight of coarse and fine modes on the AOD.…”

Section: Introductionmentioning

confidence: 99%

Origin and pathways of the mineral dust transport to two Spanish EARLINET sites: Effect on the observed columnar and range-resolved dust optical properties

Mandija

Sicard

Comerón

et al. 2017

Atmospheric Research

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In this paper, is presented a method for estimation of the effect of the transport process to aerosol optical properties. Aerosol optical data retrieved by lidars and sun-photometer measurements, are applied to Saharan dust events observed simultaneously at the two EARLINET/AERONET sites of Barcelona and Granada during the periods of June-September of 2012 and 2013. For this purpose, elastic lidar profiles and sun-photometer columnar retrievals are analyzed together with satellite observations and dust forecast models. Granada presents more than twice Saharan dust outbreaks compared to Barcelona. The scenarios favoring the Saharan dust outbreaks are identified in both places. The mineral dust originating in the Sahara region and arriving at both stations is usually transport wither over the Atlas Mountains or through an Atlantic pathway. Analyses of dust events affecting both stations reveal how differences in the transport process lead to differences in the aerosol optical properties measured at each station. Mean dustrelated Ångström exponent is 1.8 times higher in Barcelona than in Granada. This difference is a result of the additional contribution of anthropogenic aerosol, mainly in the aerosol fine mode, during the transport of the mineral dust plume over the Iberian Peninsula.© <2017>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ DOI Highlights  Coincidence Saharan dust events over the Granada and Barcelona stations are studied.  Column integrated and the vertical resolved from AERONET and EARLINET are used.  Cluster analysis of Hysplit trajectories was involved in this study.  Key scenarios of Saharan dust intrusions over Iberian Peninsula are identified.  Variations of the optical properties, during the transport process are determined. *Highlights (for review)Origin and pathways of the mineral dust transport to two Spanish EARLINET sites: effect on the observed columnar and range-resolved dust optical properties

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Size distribution and scattering phase function of aerosol particles retrieved from sky brightness measurements

Abstract: Fraser, R. S.; Nakajima, T.; Mattoo, S.; and Holben, B. N., "Size distribution and scattering phase function of aerosol particles retrieved from sky brightness measurements" (1994). Papers in Natural Resources. 271. https://digitalcommons.unl.edu/natrespapers/271

Cited by 215 publications

References 43 publications

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

Lidar observation of the 2011 Puyehue-Cordón Caulle volcanic aerosols at Lauder, New Zealand

Aerosol optical depth retrievals at the Izaña Atmospheric Observatory from 1941 to 2013 by using artificial neural networks

Origin and pathways of the mineral dust transport to two Spanish EARLINET sites: Effect on the observed columnar and range-resolved dust optical properties

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