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Volume 15 | Copyright
Adv. Sci. Res., 15, 207-212, 2018
https://doi.org/10.5194/asr-15-207-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Aug 2018

23 Aug 2018

Evaluation of radiosonde humidity sensors at low temperature using ultralow-temperature humidity chamber

Byung Il Choi1, Sang-Wook Lee1, Sang-Bong Woo1, Jong Chul Kim1, Yong-Gyoo Kim1, and Seung Gu Yang2 Byung Il Choi et al.
  • 1Korea Research Institute of Standards and Science, Daejeon, Korea
  • 2Jinyang Industrial, Ansung, Korea

Abstract. Accurate measurements of temperature and water vapor in the upper-air are of great interest in relation to weather prediction and climate change. Those measurements are mostly conducted using radiosondes equipped with a variety of sensors that are flown by a balloon up to lower stratosphere. Reference Upper Air Network (GRUAN) has identified water vapor pressure as one of the most important measurands and has set an accuracy requirement of 2% in terms of the mixing ratio. In order to achieve the requirement, many errors in the humidity measurement such as a temperature dependency in sensing characteristics including measurement values and response time need to be corrected because humidity sensors of radiosondes pass through low-pressure (1kPa) and low-temperature (−80°C) environments in the upper-air. In this paper, the humidity sensing characteristics of Jinyang radiosonde sensors in relation to temperature dependencies were evaluated at low temperature using a newly developed ultralow-temperature humidity chamber. The sensitivity characteristic curve of the radiosonde sensors was evaluated down to −80°C, and the calibration curves of the humidity sensor and the temperature sensor were obtained. The response time of humidity sensor slowly increased from 52 to 116s at the temperature from 20 to −40°C, respectively, and then rapidly increased to almost one hour at −80°C. Those results will help to improve the reliability of the upper-air observation data.

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Accurate measurements of temperature and water vapor in the upper-air are of great interest in relation to weather prediction and climate change. Those measurements are mostly conducted using radiosondes. The sensitivity characteristic and response time of radiosonde humidity sensors were investigated at low temperature, using developed ultralow-temperature humidity chamber. This work will improve the accuracy and reliability of the upper-air observation data.
Accurate measurements of temperature and water vapor in the upper-air are of great interest in...
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