Articles | Volume 11, issue 1
https://doi.org/10.5194/amt-11-459-2018
https://doi.org/10.5194/amt-11-459-2018
Research article
 | 
23 Jan 2018
Research article |  | 23 Jan 2018

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

Bernhard Buchholz and Volker Ebert

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Revised manuscript accepted for AMT
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Cited articles

Buchholz, B. and Ebert, V.: Offsets in fiber-coupled diode laser hygrometers caused by parasitic absorption effects and their prevention, Meas. Sci. Technol., 25, 75501, https://doi.org/10.1088/0957-0233/25/7/075501, 2014. 
Buchholz, B., Kühnreich, B., Smit, H. G. J., and Ebert, V.: Validation of an extractive, airborne, compact TDL spectrometer for atmospheric humidity sensing by blind intercomparison, Appl. Phys. B, 110, 249–262, https://doi.org/10.1007/s00340-012-5143-1, 2013. 
Buchholz, B., Böse, N., and Ebert, V.: Absolute validation of a diode laser hygrometer via intercomparison with the German national primary water vapor standard, Appl. Phys. B, 116, 883–899, https://doi.org/10.1007/s00340-014-5775-4, 2014. 
Buchholz, B., Kallweit, S., and Ebert, V.: SEALDH-II – An Autonomous, Holistically Controlled, First Principles TDLAS Hygrometer for Field and Airborne Applications: Design–Setup–Accuracy/Stability Stress Test, Sensors 2017, 17, 68, https://doi.org/10.3390/s17010068, 2016. 
Buchholz, B., Afchine, A., Klein, A., Schiller, C., Krämer, M., and Ebert, V.: HAI, a new airborne, absolute, twin dual-channel, multi-phase TDLAS-hygrometer: background, design, setup, and first flight data, Atmos. Meas. Tech., 10, 35–57, https://doi.org/10.5194/amt-10-35-2017, 2017. 
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This paper describes the absolute validation of the novel, calibration-free SEALDH-II hygrometer at a traceable humidity generator. During 23 days of permanent operation, 15 H2O mole fractions levels (5–1200 ppmv) at 6 gas pressures (65–950 hPa) were validated. With this validation, SEALDH-II is the first metrologically validated humidity transfer standard which links several scientific airborne and laboratory measurement campaigns to the international metrological water vapor scale.