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Water vapor retrievals from spectral direct irradiance measured with an EKO MS-711 spectroradiometer—intercomparison with other techniques

García, Rosa D.; Cuevas, Emilio; Cachorro, Victoria E.; García, Omaira E.; Barreto, África; Almansa, Almansa F.; Romero-Campos, Pedro M.; Ramos, Ramón; Pó, Mário; Hoogendijk, Kees; Gross, Jochen

Abstract:
Precipitable water vapor retrievals are of major importance for assessing and understanding atmospheric radiative balance and solar radiation resources. On that basis, this study presents the first PWV values measured with a novel EKO MS-711 grating spectroradiometer from direct normal irradiance in the spectral range between 930 and 960 nm at the Izaña Observatory (IZO, Spain) between April and December 2019. The expanded uncertainty of PWV (U$_{PWV}$) was theoretically evaluated using the Monte-Carlo method, obtaining an averaged value of 0.37 ± 0.11 mm. The estimated uncertainty presents a clear dependence on PWV. For PWV ≤ 5 mm (62% of the data), the mean U$_{PWV}$ is 0.31 ± 0.07 mm, while for PWV > 5 mm (38% of the data) is 0.47 ± 0.08 mm. In addition, the EKO PWV retrievals were comprehensively compared against the PWV measurements from several reference techniques available at IZO, including meteorological radiosondes, Global Navigation Satellite System (GNSS), CIMEL-AERONET sun photometer and Fourier Transform Infrared spectrometry (FTIR). The EKO PWV values closely align with the above mentioned different techniques, providing a mean bias and standard deviation of −0.30 ± 0.89 mm, 0.02 ± 0.68 mm, −0.57 ± 0.68 mm, and 0.33 ± 0.59 mm, with respect to the RS92, GNSS, FTIR and CIMEL-AERONET, respectively. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129836
Veröffentlicht am 03.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung (IMK)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000129836
Erschienen in Remote sensing
Verlag MDPI
Band 13
Heft 3
Seiten 1-20
Schlagwörter spectral direct irradiance; EKO MS-711 spectroradiometer; water vapor; Monte-Carlo method
Nachgewiesen in Dimensions
Scopus
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