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

Autor: B. I. Choi, S.-W. Lee, S.-B. Woo, J. C. Kim, Y.-G. Kim, S. G. Yang
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Advances in Science and Research, Vol 15, Pp 207-212 (2018)
Druh dokumentu: article
ISSN: 1992-0628
1992-0636
DOI: 10.5194/asr-15-207-2018
Popis: 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 (1 kPa) 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 116 s 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.
Databáze: Directory of Open Access Journals
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