Validation of a calibration set-up for radiosondes to fulfil GRUAN requirements

Hannu Sairanen (Corresponding Author), Martti Heinonen, Richard Högström

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Interest in the precise measurement of water vapour in the upper-air is growing along with the consciousness of climate change. Because better knowledge of high altitude humidity levels improves the accuracy of climate models and weather forecasts, the Global Climate Observing System (GCOS) is putting more effort into the quality of these measurements. The GCOS established the Reference Upper-Air Network (GRUAN) and set the requirements for its measurements accuracy and traceability to the International System of Units (SI). To fulfil these requirements, improved radiosondes and methods to calibrate them are being developed. This paper presents a new calibration system for radiosondes based on mixing air flows from two independent dew-point generators. The system operates in the air temperature range down to??-80 °C. Our results show that the new calibration set-up is able to provide calibrations for radionsondes at the uncertainty level of 2% in terms of the water vapour mixing ratio as required by GRUAN. A complete calibration covering the whole temperature and humidity range lasts less than three days. Additionally, the apparatus provides an option to characterize the behaviour of a radiosonde in changing temperatures and water vapour concentrations.
Original languageEnglish
Article number105901
Number of pages7
JournalMeasurement Science and Technology
Volume26
Issue number10
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Radiosondes
radiosondes
upper atmosphere
water vapor
Calibration
International System of Units
Water Vapor
requirements
climate
humidity
Water vapor
Requirements
Air
consciousness
dew point
Humidity
Climate
climate models
climate change
air flow

Keywords

  • radiosonde
  • calibration
  • GRUAN
  • humidity
  • traceability
  • uncertainty

Cite this

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title = "Validation of a calibration set-up for radiosondes to fulfil GRUAN requirements",
abstract = "Interest in the precise measurement of water vapour in the upper-air is growing along with the consciousness of climate change. Because better knowledge of high altitude humidity levels improves the accuracy of climate models and weather forecasts, the Global Climate Observing System (GCOS) is putting more effort into the quality of these measurements. The GCOS established the Reference Upper-Air Network (GRUAN) and set the requirements for its measurements accuracy and traceability to the International System of Units (SI). To fulfil these requirements, improved radiosondes and methods to calibrate them are being developed. This paper presents a new calibration system for radiosondes based on mixing air flows from two independent dew-point generators. The system operates in the air temperature range down to??-80 °C. Our results show that the new calibration set-up is able to provide calibrations for radionsondes at the uncertainty level of 2{\%} in terms of the water vapour mixing ratio as required by GRUAN. A complete calibration covering the whole temperature and humidity range lasts less than three days. Additionally, the apparatus provides an option to characterize the behaviour of a radiosonde in changing temperatures and water vapour concentrations.",
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author = "Hannu Sairanen and Martti Heinonen and Richard H{\"o}gstr{\"o}m",
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Validation of a calibration set-up for radiosondes to fulfil GRUAN requirements. / Sairanen, Hannu (Corresponding Author); Heinonen, Martti; Högström, Richard.

In: Measurement Science and Technology, Vol. 26, No. 10, 105901, 2015.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Validation of a calibration set-up for radiosondes to fulfil GRUAN requirements

AU - Sairanen, Hannu

AU - Heinonen, Martti

AU - Högström, Richard

N1 - Project code: 104348

PY - 2015

Y1 - 2015

N2 - Interest in the precise measurement of water vapour in the upper-air is growing along with the consciousness of climate change. Because better knowledge of high altitude humidity levels improves the accuracy of climate models and weather forecasts, the Global Climate Observing System (GCOS) is putting more effort into the quality of these measurements. The GCOS established the Reference Upper-Air Network (GRUAN) and set the requirements for its measurements accuracy and traceability to the International System of Units (SI). To fulfil these requirements, improved radiosondes and methods to calibrate them are being developed. This paper presents a new calibration system for radiosondes based on mixing air flows from two independent dew-point generators. The system operates in the air temperature range down to??-80 °C. Our results show that the new calibration set-up is able to provide calibrations for radionsondes at the uncertainty level of 2% in terms of the water vapour mixing ratio as required by GRUAN. A complete calibration covering the whole temperature and humidity range lasts less than three days. Additionally, the apparatus provides an option to characterize the behaviour of a radiosonde in changing temperatures and water vapour concentrations.

AB - Interest in the precise measurement of water vapour in the upper-air is growing along with the consciousness of climate change. Because better knowledge of high altitude humidity levels improves the accuracy of climate models and weather forecasts, the Global Climate Observing System (GCOS) is putting more effort into the quality of these measurements. The GCOS established the Reference Upper-Air Network (GRUAN) and set the requirements for its measurements accuracy and traceability to the International System of Units (SI). To fulfil these requirements, improved radiosondes and methods to calibrate them are being developed. This paper presents a new calibration system for radiosondes based on mixing air flows from two independent dew-point generators. The system operates in the air temperature range down to??-80 °C. Our results show that the new calibration set-up is able to provide calibrations for radionsondes at the uncertainty level of 2% in terms of the water vapour mixing ratio as required by GRUAN. A complete calibration covering the whole temperature and humidity range lasts less than three days. Additionally, the apparatus provides an option to characterize the behaviour of a radiosonde in changing temperatures and water vapour concentrations.

KW - radiosonde

KW - calibration

KW - GRUAN

KW - humidity

KW - traceability

KW - uncertainty

U2 - 10.1088/0957-0233/26/10/105901

DO - 10.1088/0957-0233/26/10/105901

M3 - Article

VL - 26

JO - Measurement Science and Technology

JF - Measurement Science and Technology

SN - 0957-0233

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