|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
Peer-reviewed Journal Articles, etc >
The Behavior of the Snow White Chilled-Mirror Hygrometer in Extremely Dry Conditions
Title: | The Behavior of the Snow White Chilled-Mirror Hygrometer in Extremely Dry Conditions |
Authors: | Vömel, H. Browse this author | Fujiwara, M. Browse this author →KAKEN DB | Shiotani, M. Browse this author | Hasebe, F. Browse this author →KAKEN DB | Oltmans, S. J. Browse this author | Barnes, J. E. Browse this author |
Issue Date: | Nov-2003 |
Publisher: | American Meteorological Society |
Journal Title: | Journal of Atmospheric and Oceanic Technology |
Volume: | 20 |
Issue: | 11 |
Start Page: | 1560 |
End Page: | 1567 |
Publisher DOI: | 10.1175/1520-0426(2003)020<1560:TBOTSW>2.0.CO;2 |
Abstract: | The Snow White hygrometer, made by Meteolabor AG, Switzerland, is a new chilled-mirror instrument using a thermoelectric Peltier cooler to measure atmospheric water vapor. Its performance under dry conditions is evaluated in simultaneous measurements using the NOAA/CMDL frost-point hygrometer at Boulder, Colorado; San Cristo´bal, Gala´pagos Islands, Ecuador; Watukosek, Indonesia; and Mauna Loa Observatory, Hawaii. The Snow White exhibits a lower detection limit of about 3%–6% relative humidity, depending on the sensor configuration. This detection limit is determined by the temperature depression attainable by the thermoelectric cooler. In some cases, loss of frost-point control within layers with relative humidity below this detection limit caused inaccurate measurements above these dry layers, where the relative humidity was within the detection range of the instrument. The sensor does not operate in the stratosphere because of the large frost-point depression and the large potential for outgassing of water from the instrument box and the sensor housing. The instrument has some capabilities in the tropical tropopause region; however, the results are somewhat mixed. |
Rights: | © Copyright 2003 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyright@ametsoc.org. |
Type: | article |
URI: | http://hdl.handle.net/2115/64841 |
Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 藤原 正智
|