Snow White

A low-cost chilled-mirror hygrometer for radiosondes

updated, February 2004

(Contact Masatomo Fujiwara (fuji @ [
web]) and Paul Ruppert (paul.ruppert @ for the latest information.)

Reference papers on Snow White

01. Fujiwara, M., M. Shiotani, F. Hasebe, H. Voemel, S. J. Oltmans, P. W. Ruppert, T. Horinouchi, and T. Tsuda,
Performance of the Meteolabor "Snow White" chilled-mirror hygrometer in the tropical troposphere: Comparisons with the Vaisala RS80 A/H-Humicap sensors,
Journal of Atmospheric and Oceanic Technology, 20, 1534-1542, 2003. [JTECH]

02. Voemel, H., M. Fujiwara, M. Shiotani, F. Hasebe, S. J. Oltmans, and J. E. Barnes,
The behavior of the Snow White chilled-mirror hygrometer in extremely dry conditions,
Journal of Atmospheric and Oceanic Technology, 20, 1560-1567, 2003. [JTECH]

03. Wang, J., D. J. Carlson, D. B. Parsons, T. F. Hock, D. Lauritsen, H. L. Cole, K. Beierle, and E. Chamberlain,
Performance of operational radiosonde humidity sensors in direct comparison with a chilled mirror dew-point hygrometer and its climate implication,
Geophysical Research Letters, 30, No. 16, 1860, 10.1029/2003GL016985, 2003.


[1] General Information on meteolabor AG and Snow White

[2] Special Model "SOWER-Snow White"

[3] Radiosonde System Utilizing TMAX-C Interface Board and Vaisala RS80-15(A/H)

[4] SOWER Activities and Some Preliminary Results

[5] Remaining Problems and Modification Plan

Other Information

01. Surinam in October 2002

02. Sapporo-EES results in June-August 2003

03. Meteolabor's new radiosonde system (ARGUS37 & SRS-C34) (September 2003)

04. Modification to Night Type (Jan. 2004 version)

05. Snow White Assembly Manual (Feb. 2004 version) [ MS-WORD (9MB) ] and Check Sheet [ Page 1/2 (PDF-44kB) , Page 2/2 (PDF-14kB) ]

Masatomo Fujiwara
Environmental Earth Science, Hokkaido University, Japan
E-mail : fuji @