Preprints
https://doi.org/10.5194/amt-2021-246
https://doi.org/10.5194/amt-2021-246

  28 Sep 2021

28 Sep 2021

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

Radiation correction and uncertainty evaluation of RS41 temperature sensors by using an upper-air simulator

Sang-Wook Lee1,2, Sunghun Kim1, Young-Suk Lee1, Byung Il Choi1, Woong Kang1, Youn Kyun Oh1, Seongchong Park1, Jae-Keun Yoo1, Sungjun Lee1, Suyong Kwon1,2, and Yong-Gyoo Kim1 Sang-Wook Lee et al.
  • 1Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
  • 2Department of Science of Measurement, University of Science and Technology, Daejeon 34113, Republic of Korea

Abstract. An upper-air simulator (UAS) has been developed at the Korea Research Institute of Standards and Science (KRISS) to study the effects of solar irradiation of commercial radiosondes. In this study, the uncertainty of the radiation correction of a Vaisala RS41 temperature sensor is evaluated using the UAS at KRISS. First, the effects of environmental parameters including the temperature (T), pressure (P), ventilation speed (v), and irradiance (S) are formulated in the context of the radiation correction. The considered ranges of T, P, and v are −67 to 20 °C, 5–500 hPa, and 4–7 m·s−1, respectively, with a fixed S0 = 980 W·m−2. Second, the uncertainties in the environmental parameters determined using the UAS are evaluated to calculate their contribution to the uncertainty in the radiation correction. In addition, the effects of rotation and tilting of the sensor boom with respect to the irradiation direction are investigated. The uncertainty in the radiation correction is obtained by combining the contributions of all uncertainty factors. The expanded uncertainty associated with the radiation correction for the RS41 temperature sensor is 0.119 °C at the coverage factor k = 2 (approximately 95 % confidence level). The findings obtained by reproducing the environment of the upper air by using the ground-based facility can provide a basis to increase the measurement accuracy of radiosondes within the framework of traceability to the International System of Units.

Sang-Wook Lee et al.

Status: open (until 03 Nov 2021)

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Sang-Wook Lee et al.

Sang-Wook Lee et al.

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Short summary
The measurement of temperature in the free atmosphere is of significance for weather prediction and climate monitoring. Radiosondes are used to measure essential climate variables in upper air. Herein, an upper-air simulator is developed and its performance is evaluated to improve the measurement accuracy of radiosondes by reproducing the environments that may be encountered by radiosondes. The paper presents a methodology to correct the main source of error for the radiosonde measurements.