Spectroradiometer with wedge interference filters (SWIF): measurements of the spectral optical depths at Mauna Loa Observatory

Vasilyev, O. B.; Leyva, Alejandra González; Muhila, Agustin; Valdés, M.; Peralta, Ricardo A.; Kovalenko, A. P.; Welch, Ronald M.; Berendes, Todd; Isakov, Vladilen Yu.; Kulikovskiy, Yuri P.; Sokolov, S. S.; Strepanov, Nikolay N.; Gulidov, S. S.; Hoyningen‐Huene, W. von

doi:10.1364/ao.34.004426

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…A detailed description of these can be found in the work by Utrillas et al [2001]. The measurement of solar irradiance with high spectral resolution (<0.01 μm) permits (1) separation of the aerosol signal from that produced by molecular scattering and absorption, (2) retrieval of aerosol optical parameters, and (3) estimation of the aerosol microphysical characteristics, such as the aerosol size distribution [ Vasilyev et al , 1995]. The subsequent processing of these data has allowed, for instance, the atmospheric correction of the POLDER images [see, for example, Ponchaut , 2000].…”

Section: Measurement Campaignsmentioning

confidence: 99%

“…Location of the Barrax study area selected for the DAISEX campaigns. and absorption, (2) retrieval of aerosol optical parameters, and (3) estimation of the aerosol microphysical characteristics, such as the aerosol size distribution [Vasilyev et al, 1995]. The subsequent processing of these data has allowed, for instance, the atmospheric correction of the POLDER images [see, for example, Ponchaut, 2000].…”

Section: Measurement Campaignsmentioning

confidence: 99%

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Column‐integrated aerosol optical properties from ground‐based spectroradiometer measurements at Barrax (Spain) during the Digital Airborne Imaging Spectrometer Experiment (DAISEX) campaigns

Pedrós¹

2003

J. Geophys. Res.

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[1] The Digital Airborne Imaging Spectrometer Experiment (DAISEX) was carried out for the European Space Agency (ESA) in order to develop the potential of spaceborne imaging spectroscopy for a range of different scientific applications. DAISEX involved simultaneous data acquisitions using different airborne imaging spectrometers over test sites in southeast Spain (Barrax) and the Upper Rhine valley (Colmar, France, and Hartheim, Germany). This paper presents the results corresponding to the columnintegrated aerosol optical properties from ground-based spectroradiometer measurements over the Barrax area during the DAISEX campaign days in the years 1998, 1999, and 2000. The instruments used for spectral irradiance measurements were two Licor 1800 and one Optronic OL-754 spectroradiometers. The analysis of the spectral aerosol optical depth in the visible range shows in all cases the predominance of the coarse-particle mode over the fine-particle mode. The analysis of the back trajectories of the air masses indicates a predominance of marine-type aerosols in the lower atmospheric layers in all cases. Overall, the results obtained show that during the DAISEX there was a combination of maritime aerosols with smaller continental aerosols.

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Section: Measurement Campaignsmentioning

confidence: 99%

Section: Measurement Campaignsmentioning

confidence: 99%

Column‐integrated aerosol optical properties from ground‐based spectroradiometer measurements at Barrax (Spain) during the Digital Airborne Imaging Spectrometer Experiment (DAISEX) campaigns

Pedrós¹

2003

J. Geophys. Res.

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“…One of the current problems with the use of the α parameter is the difficulty of a real comparison between existing data (Cachorro et al, 2001a). This is due to the different wavelengths or spectral ranges used for the determination of this parameter, as varied as the instruments used to reach the aerosol optical depth (AOD), from broadband radiation measurements to selected narrow spectral filters with sun photometers (Harrison and Michalsky, 1994;Villevalde et al, 1994;Vasilyev et al, 1995;Alados-Arboledos et al, 2003;Silva et al, 2003). Added to this wide range of the number and values of the wavelengths, the bandwidths, typically from 50 to 5 nm of the different radiometric systems (WMO, 1986(WMO, , 1993(WMO, , 2003, more accentuated with spectroradiometers, make the determination of the α parameter very different.…”

Section: Introductionmentioning

confidence: 99%

Columnar characteristics of aerosols by spectroradiometer measurements in the maritime area of the Cadiz Gulf (Spain)

Vergaz

Cachorro²,

Baraja

et al. 2005

Intl Journal of Climatology

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Atmospheric aerosol characteristics represented by the spectral aerosol optical depth AOD) and the αÅngström turbidity parameter were determined in the coastal area of the Gulf of Cádiz, (southwest of Spain). The columnar aerosol properties presented here correspond to the 1996-1999 period, and were obtained by solar direct irradiance measurements carried out by a Licor1800 spectroradiometer. The performance of this type of medium-spectral resolution radiometric system is analysed over the measured period. The detailed spectral information of these irradiance measurements enabled the use of selected non-absorption gases spectral windows to determine the columnar spectral AOD that was modelled byÅngström formula to obtain the α coefficient. Temporal evolutions of instantaneous values together with a general statistical analysis represented by seasonal values, frequency distributions and some representative correlations for the AOD and the derived αÅngström coefficient gave us the first insight of aerosol characteristics in this coastal area. Special attention was paid to the analysis of these aerosol properties at the nominal wavelengths of 440 nm, 670 nm, 870 nm and 1020 nm for the near-future comparisons with the Cimel sun-photometer data. However, taking the most representative aerosol wavelength of 500 nm, the variability of the AOD ranges from 0.005 to 0.53, with a mean of 0.12 (s.d = 0.07) and that of the α parameter is given by a mean value of 0.93 (s.d. = 0.58) falling inside the range of marine aerosols. A quantitative discrimination of aerosol types was conducted on the basis of the spectral aerosol properties and air mass back trajectory analysis, which resulted in a mixed type because of the specificity of this area, given by very frequent desert dust episodes, continental and polluted local influences. This study represents the first extended data characterization about columnar properties of aerosols in Spain which has been continued by Cimel-AERONET data.

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“…The AOD at ground level is currently measured at visible and infrared wavelengths by means of commercial photometers (Holben et al, 1998), radiometers (Harrison et al, 1994;Fuenzalida, 1998), spectroradiometers (Ahern et al, 1991;Vasilyev et al, 1995;Cachorro et al, 1989Cachorro et al, , 2000a, or different scientific prototypes (Marenco et al, 1997;Russel et al, 1996). The currently available photometers make the measurements at isolated wavelengths by means of a filter with a spectral width of 5 to 20 nm, depending on the instrument.…”

Section: Introductionmentioning

confidence: 99%

Measurements and estimation of the columnar optical depth of tropospheric aerosols in the UV spectral region

et al. 2002

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Abstract.We report values of the columnar tropospheric aerosol optical depth at UV wavelengths based on experimental measurements of the direct spectral irradiances carried out by a commercial spectroradiometer (Li1800 of Licor company) covering the range from 300-1100 nm at two stations with different climate characteristics in Spain. The first station is located in a rural site in north central Spain with continental climate. The data extend from March to the end of October of 1995. The other station is a coastal site in the Gulf of Cádiz (southwest Spain) of maritime climate type. This study is mainly focused on the capability of estimating aerosol optical depth values in the UV region based on the extracted information in the visible and near infrared ranges. A first method has been used based on theÅngström turbidity parameters. However, since this method requires detailed spectral information, a second method has also been used, based on the correlation between wavelengths. A correlation has been established between the experimental aerosol optical depth values at 350 nm and 500 nm wavelengths. Although the type of aerosol seems to be the key factor that determines the quality of these estimations, the evaluation of the associated error is necessary to know the behavior of these estimations in each area of study.

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Spectroradiometer with wedge interference filters (SWIF): measurements of the spectral optical depths at Mauna Loa Observatory

Cited by 9 publications

References 12 publications

Column‐integrated aerosol optical properties from ground‐based spectroradiometer measurements at Barrax (Spain) during the Digital Airborne Imaging Spectrometer Experiment (DAISEX) campaigns

Column‐integrated aerosol optical properties from ground‐based spectroradiometer measurements at Barrax (Spain) during the Digital Airborne Imaging Spectrometer Experiment (DAISEX) campaigns

Columnar characteristics of aerosols by spectroradiometer measurements in the maritime area of the Cadiz Gulf (Spain)

Measurements and estimation of the columnar optical depth of tropospheric aerosols in the UV spectral region

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