Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 123166
Title Oxygen sensitivity of krypton and Lyman-alpha hygrometers
Author(s) Dijk, A. van; Kohsiek, W.; Bruin, H.A.R. de
Source Journal of Atmospheric and Oceanic Technology 20 (2003)1. - ISSN 0739-0572 - p. 143 - 151.
Department(s) Meteorology and Air Quality
Publication type Refereed Article in a scientific journal
Publication year 2003
Abstract The oxygen sensitivity of krypton and Lyman-¿ hygrometers is studied. Using a dewpoint generator and a controlled nitrogen/oxygen flow the extinction coefficients of five hygrometers associated with the third-order Taylor expansion of the Lambert¿Beer law around reference conditions for oxygen and for water vapor were measured. Latent heat flux corrections for cross-talk of the sensible heat flux are given as a function of the Bowen ratio. The spread observed in oxygen sensitivities calls for individual oxygen calibrations for each apparatus. It is found that the separation between the tubes is the crucial parameter with respect to the oxygen sensitivity. The oxygen-related nonlinearities in the Lambert¿Beer law are stronger than those associated with water vapor. This leads to a strong reduction of the oxygen sensitivity at a more or less constant water vapor sensitivity when the separation between the tubes is doubled from 1.3 to 2.6 cm. This characteristic is supported by a sensitivity analysis of the theoretical response relations of both types of hygrometers, based on multiple emission and absorption lines. The findings of Tanner et al. are confirmed¿the results of a previous study strongly overestimate the oxygen sensitivity of today's krypton hygrometers
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