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The fictitious diurnal cycle of aerosol optical depth: A new approach for “in situ” calibration and correction of AOD data series
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dc.contributor.authorCachorro, Victoria E.es_ES
dc.contributor.authorRomero Campos, Pedro Migueles_ES
dc.contributor.authorToledano, Carloses_ES
dc.contributor.authorCuevas Agulló, Emilioes_ES
dc.contributor.authorFrutos Baraja, Ángel Máximo dees_ES
dc.identifier.citationGeophysical Research Letters. 2004, 31(12), p. L12106es_ES
dc.description.abstractAerosol optical depth (AOD) very often shows a distinct diurnal cycle pattern, which seems to be an artifact. This phenomenon is the result of a deficient calibration (or an equivalent effect, as filter degradation). The fictitious sinusoidal shape of the AOD diurnal cycle is a function of the cosine of the solar zenith angle (SZA) and its effect is more accentuated during mid-day. The observation of this effect is not easy at current field stations and only those stations with excellent weather conditions permit an easier detection and correction. By taking advantage of this diurnal cycle behavior because of its dependence on the cosine of the SZA, we propose an improved “in situ” calibration correction procedure. The method is named KCICLO because the determination of a constant K and the behavior of AOD as a cycle (ciclo, in Spanish). It can be seen as a modification of the classical Langley technique (CLT) with the same level of accuracy when CLT is applied at high-altitude stations, and results in an accuracy of 0.2–0.5% for the calibration ratio constant K (or 0.002–0.005 in AOD). The application of this correction method to current and old data series at sunny stations is a significant improvement over “in situ” methods, because no other information beyond the AOD data is necessary.es_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.subjectAerosol optical depthes_ES
dc.subjectDiurnal cyclees_ES
dc.subjectSolar zenith anglees_ES
dc.subjectLangley techniquees_ES
dc.titleThe fictitious diurnal cycle of aerosol optical depth: A new approach for “in situ” calibration and correction of AOD data serieses_ES
Appears in Collections:Artículos científicos 2000-2004

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