Vaisala Radiosonde Water Vapor Measurements:
Accuracy and Correction
This page contains information and results related to my work on characterizing and improving the accuracy of atmospheric relative humidity measurements from Vaisala radiosondes (especially RS92).
As an aside, this interesting figure nicely captures my transition from cloud physics research to atmospheric water vapor and radiosondes, and illustrates their close connection.
Some Relevant Topics and Documents
|RS92 Correction Method
||Description, implementation tips, and IDL code related to my method of correcting RS92 RH measurements for sensor time-lag error, mean calibration bias, and solar radiation error.
|RS92 Correction and Analysis Services
||Not interested in developing your own correction algorithm using the information given above? I can do it faster, better, and cheaper. Looking for expert analysis of radiosonde or other types of data? I'm available for hire on projects such as these.
||The Temperature-Humidity reference system (THref) is a high-accuracy reference standard for RH and T measurements that is suitable for indoor or outdoor environments. It is particularly well-suited for characterizing the accuracy of RH, T, and P measurements from radiosondes or other instrumentation. Its measurement uncertainty is ±0.5% RH, ±0.1°C, and ±0.08 mb.
||A summary of the accuracy of RH measurements from various Vaisala radiosonde models, and the effect of applying corrections for known measurement errors.
|RS92 Data Continuity
||This is Vaisala's reference page that documents hardware and software changes affecting RS92 measurements. Beginning in Dec. 2010, new or updated Digicora v3.64 software applies RH corrections for sensor time-lag error and solar radiation error. Unfortunately, this introduces new Data Continuity issues.
|RS92 Best Practices
||My on-going list of operational practices aimed at improving radiosonde data quality and consistency. Please, everyone, save the FLEDT file rather than the EDT file, and don't use those RH=1.0% values in analyses!
My Main Radiosonde-related Publications
- Miloshevich, L.M., H. Vömel, D.N. Whiteman, and T. Leblanc (2009), Accuracy assessment and correction of Vaisala RS92 radiosonde water vapor measurements. J. Geophys. Res., 114, D11305, doi:10.1029/2008JD011565. [PDF]
- Miloshevich, L.M., H. Vömel, D.N. Whiteman, B.M. Lesht, F.J. Schmidlin, and F. Russo (2006), Absolute accuracy of water vapor measurements from six operational radiosonde types launched during AWEX-G and implications for AIRS validation. J. Geophys. Res., 111, doi:10.1029/2005JD006083. [PDF]
- Miloshevich, L.M., A. Paukkunen, H. Vömel, and S.J. Oltmans (2004), Development and validation of a time-lag correction for Vaisala radiosonde humidity measurements. J. Atmos. Oceanic Technol., 21, 1305-1327. [PDF]
- Miloshevich, L.M., H. Vömel, A. Paukkunen, A.J. Heymsfield, and S.J. Oltmans (2001), Characterization and Correction of Relative Humidity Measurements from Vaisala RS80-A Radiosondes at Cold Temperatures. J. Atmos. Oceanic Technol.,18, 135-156. [PDF]