AERONET—A Federated Instrument Network and Data Archive for Aerosol Characterization

Holben, B. N.; Eck, T. F.; Slutsker, I.; Tanré, D.; Buis, Jean-Pierre; Setzer, Alberto; Vermote, Éric; Reagan, John A.; Kaufman, Yoram J.; Nakajima, Teruyuki; Lavenu, F.; Jankowiak, Isabelle; Смирнов, А. И.

doi:10.1016/s0034-4257(98)00031-5

Cited by 7,017 publications

(5,761 citation statements)

References 35 publications

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“…As we focus on the capacity of POLDER to derive information on the particle mass, we first consider the comparison of POLDER derived AOT with integrated volume size distribution. For this purpose we use the data collected by the globally distributed AErosol RObotic NETwork (AERONET) (Holben et al, 1998) hardware, which consists in more than 140 identical automatic sun-sky scanning spectral radiometers. The aerosol size distribution (between 0.05 and 15 µm) and optical parameters (single scattering albedo, volume concentration, refractive index, and effective radius) are derived from the angular distribution of sky radiances measured in the almucantar according to the algorithm developed by .…”

Section: Evaluation Of the Polder-2 Aerosol Optical Thicknessmentioning

confidence: 99%

Characterization of aerosol pollution events in France using ground-based and POLDER-2 satellite data

et al. 2006

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Abstract. We analyze the relationship between daily fine particle mass concentration (PM2.5) and columnar aerosol optical thickness derived from the Polarization and Directionality of Earth's Reflectances (POLDER) satellite sensor. The study is focused over France during the POLDER-2 lifetime between April and October 2003. We have first compared the POLDER derived aerosol optical thickness (AOT) with integrated volume size distribution derived from ground-based Sun Photometer observations. The good correlation (R=0.72) with sub-micron volume fraction indicates that POLDER derived AOT is sensitive to the fine aerosol mass concentration. Considering 1974 match-up data points over 28 fine particle monitoring sites, the POLDER-2 derived AOT is fairly well correlated with collocated PM2.5 measurements, with a correlation coefficient of 0.55. The correlation coefficient reaches a maximum of 0.80 for particular sites. We have analyzed the probability to find an appropriate air quality category (AQC) as defined by U.S. Environmental Protection Agency (EPA) from POLDER-2 AOT measurements. The probability can be up to 88.8% (±3.7%) for the "Good" AQC and 89.1% (±3.6%) for the "Moderate" AQC.

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Section: Evaluation Of the Polder-2 Aerosol Optical Thicknessmentioning

confidence: 99%

Characterization of aerosol pollution events in France using ground-based and POLDER-2 satellite data

et al. 2006

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“…Berkoff et al (2011) and Barreto et al (2013) present surface-based methods to estimate nighttime aerosol optical properties through measuring the attenuated moonlight using a modified version of sun photometers. Based on Berkoff et al (2011), the NASA AErosol RObotic NETwork (AERONET, Holben et al, 1998) team is developing an operational nighttime aerosol retrieval capability (B. Holben, personal communication, 2015). While mineral dust can be detected and in part quantified from space by infrared means (e.g., Miller, 2003;Hansell et al, 2007;Lee and Sohn, 2012), the recently launched Visible Infrared Imaging Radiometer Suite (VIIRS) instrument, equipped with a calibrated Day/Night Band (DNB), opens a new door for enabling shortwave nighttime aerosol retrievals from spaceborne observations (e.g., Johnson et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

An improved method for retrieving nighttime aerosol optical thickness from the VIIRS Day/Night Band

McHardy

Zhang

Reid³

et al. 2015

Atmos. Meas. Tech.

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Abstract. Using Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) data, a method, dubbed the "variance method", is developed for retrieving nighttime aerosol optical thickness (τ ) values through the examination of the dispersion of radiance values above an artificial light source. Based on the improvement of a previous algorithm, this updated method derives a semi-quantitative indicator of nighttime τ using artificial light sources. Nighttime τ retrievals from the newly developed method are inter-compared with an interpolated value from late afternoon and early morning ground observations from four AErosol RObotic NETwork (AERONET) sites as well as column-integrated τ from one High Spectral Resolution Lidar (HSRL) site at Huntsville, AL, during the NASA Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC 4 RS) campaign, providing full diel coverage. Sensitivity studies are performed to examine the effects of lunar illumination on VI-IRS τ retrievals made via the variance method, revealing that lunar contamination may have a smaller impact than previously thought; however, the small sample size of this study limits the conclusiveness thus far. VIIRS τ retrievals yield a coefficient of determination (r 2 ) of 0.60 and a root-meansquared error (RMSE) of 0.18 when compared against straddling daytime-averaged AERONET τ values. Preliminary results suggest that artificial light sources can be used for estimating regional and global nighttime aerosol distributions in the future.

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“…Andrada et al (2008) reported the seasonal variability of aerosols in Córdoba by using the Aerosol Optical Depth parameter (AOD) at 340 nanometers. AODs at different wavelength have been monitored by AERONET (AErosol RObotic NETwork) which is a federated international network coordinated by the NASA Goddard Space Flight Center (for detailed description of the acquisition instruments and data procedure see Holben et al, 1998). Even the AERONET site is 20 km away from Córdoba City, Andrada et al (2008) showed the regional character of the aerosols in Córdoba.…”

Section: Resultsmentioning

confidence: 99%

Measurements of natural deposition ice nuclei in Córdoba, Argentina

López

Ávila

2013

Atmos. Chem. Phys.

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Ice nucleation in the atmosphere is of practical and fundamental importance since ice crystals influence the release of snow, rain and hail. Suspended aerosols in the atmosphere typically initiate freezing at temperatures below −15 °C; although occasionally freezing occurs at higher temperatures. In this work we describe an experimental device designed to measure the concentration of natural ice nuclei under controlled temperature and supersaturation conditions. The measurements were performed at Córdoba City, for temperatures between −15 °C and −30 °C and the sampled air was supersaturated with respect to ice and subsaturated with respect to liquid water; under these conditions the deposition ice nuclei were quantified. There are few studies reported in the literature regarding measurements of deposition ice nuclei concentration and, to our knowledge, there are no previous laboratory data of this kind of ice nuclei for T < −20 °C. The results show that the number of deposition ice nuclei increases at colder temperatures and higher supersaturations. These results are in general in good agreement with results previously reported by other authors. A fitting function which depends on temperature and supersaturation is proposed to parameterize the results obtained in the present work

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AERONET—A Federated Instrument Network and Data Archive for Aerosol Characterization

Cited by 7,017 publications

References 35 publications

Characterization of aerosol pollution events in France using ground-based and POLDER-2 satellite data

Characterization of aerosol pollution events in France using ground-based and POLDER-2 satellite data

An improved method for retrieving nighttime aerosol optical thickness from the VIIRS Day/Night Band

Measurements of natural deposition ice nuclei in Córdoba, Argentina

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