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Absolute, pressure-dependent validation of a calibration-free, airborne laser hygrometer transfer standard (SEALDH-II) from 5 to 1200 ppmv using a metrological humidity generator

Buchholz, Bernhard ; Ebert, Volker (2022):
Absolute, pressure-dependent validation of a calibration-free, airborne laser hygrometer transfer standard (SEALDH-II) from 5 to 1200 ppmv using a metrological humidity generator. (Publisher's Version)
In: Atmospheric Measurement Techniques, 11 (1), pp. 459-471. Copernicus Publications, ISSN 1867-1381, e-ISSN 1867-8548,
DOI: 10.26083/tuprints-00012850,
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Item Type: Article
Origin: Secondary publication
Status: Publisher's Version
Title: Absolute, pressure-dependent validation of a calibration-free, airborne laser hygrometer transfer standard (SEALDH-II) from 5 to 1200 ppmv using a metrological humidity generator
Language: English
Abstract:

Highly accurate water vapor measurements are indispensable for understanding a variety of scientific questions as well as industrial processes. While in metrology water vapor concentrations can be defined, generated, and measured with relative uncertainties in the single percentage range, field-deployable airborne instruments deviate even under quasistatic laboratory conditions up to 10–20 %. The novel SEALDH-II hygrometer, a calibration-free, tuneable diode laser spectrometer, bridges this gap by implementing a new holistic concept to achieve higher accuracy levels in the field. We present in this paper the absolute validation of SEALDH-II at a traceable humidity generator during 23 days of permanent operation at 15 different H₂O mole fraction levels between 5 and 1200 ppmv. At each mole fraction level, we studied the pressure dependence at six different gas pressures between 65 and 950 hPa. Further, we describe the setup for this metrological validation, the challenges to overcome when assessing water vapor measurements on a high accuracy level, and the comparison results. With this validation, SEALDH-II is the first airborne, metrologically validated humidity transfer standard which links several scientific airborne and laboratory measurement campaigns to the international metrological water vapor scale.

Journal or Publication Title: Atmospheric Measurement Techniques
Volume of the journal: 11
Issue Number: 1
Publisher: Copernicus Publications
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Divisions: 07 Department of Chemistry > Physical Chemistry
Date Deposited: 09 Mar 2022 15:24
Last Modified: 10 Mar 2022 09:57
DOI: 10.26083/tuprints-00012850
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-128503
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/12850
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