Preprints
https://doi.org/10.5194/amt-2021-343
https://doi.org/10.5194/amt-2021-343

  01 Dec 2021

01 Dec 2021

Review status: this preprint is currently under review for the journal AMT.

Laboratory characterisations and intercomparison sounding test of dual thermistor radiosondes for radiation correction

Sang-Wook Lee1,2, Sunghun Kim1, Young-Suk Lee1, Jae-Keun Yoo1, Sungjun Lee1, Suyong Kwon1,2, Byung Il Choi1, Jaewon So3, and Yong-Gyoo Kim1 Sang-Wook Lee et al.
  • 1Division of Physical Metrology, Korea Research Institute of Standards an 5 d Science, Daejeon 34113, Republic of Korea
  • 2Department of Science of Measurement, University of Science and Technology, Daejeon 34113, Republic of Korea
  • 3Weathex, Gunpo 15880, Republic of Korea

Abstract. A dual thermistor radiosonde (DTR) comprising two (white and black) sensors with different emissivities was developed to correct the effects of solar radiation on temperature sensors based on in-situ radiation measurements. Herein, the DTR performance is characterised in terms of the uncertainty via a series of ground-based facilities and an intercomparison sounding test. The DTR characterisation procedure using laboratory facilities is as follows: individually calibrate the temperature of the thermistors in a climate chamber; test the effect of temperature on the resistance reading using radiosonde boards in the climate chamber; individually perform radiation tests on thermistors; and perform parameterisation of the radiation measurement and correction formulas using an upper air simulator with varying temperature, pressure and ventilation speed. These results are combined and applied to the DTR sounding test conducted in July, 2021. Thereafter, the effective irradiance is measured using the temperature difference between the white and black sensors of the DTR. The measured irradiance is then used for the radiation correction of the DTR white sensor. The radiation-corrected temperature of the DTR is mostly consistent with that of a commercial radiosonde (Vaisala, RS41) within the expanded uncertainty (~0.35 ℃) of the DTR at the coverage factor k = 2. Furthermore, the components contributing to the uncertainty of the radiation measurement and correction are analysed. The DTR methodology can improve the accuracy of temperature measurement in the upper air within the framework of the traceability to the International System of Units.

Sang-Wook Lee et al.

Status: open (until 09 Feb 2022)

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Sang-Wook Lee et al.

Sang-Wook Lee et al.

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Short summary
Dual thermistor radiosonde (DTR) comprising two (white and black) sensors with different emissivities is developed to correct the effects of solar radiation on temperature sensors based on in-situ radiation measurements. All components contributing to the uncertainty of the radiation measurement and correction are analysed. The DTR methodology improves the accuracy of temperature measurement in the upper air within the framework of the traceability to the International System of Units.