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Performance of the Meteolabor "Snow White" Chilled-Mirror Hygrometer in the Tropical Troposphere : Comparisons with the Vaisala RS80 A/H-Humicap Sensors

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Title: Performance of the Meteolabor "Snow White" Chilled-Mirror Hygrometer in the Tropical Troposphere : Comparisons with the Vaisala RS80 A/H-Humicap Sensors
Authors: Fujiwara, Masatomo Browse this author →KAKEN DB
Shiotani, Masato Browse this author
Hasebe, Fumio Browse this author →KAKEN DB
Vomel, Holger Browse this author
Oltmans, Samuel J. Browse this author
Ruppert, Paul W. Browse this author
Horinouchi, Takeshi Browse this author
Tsuda, Toshitaka Browse this author
Issue Date: 1-Nov-2003
Publisher: American Meteorological Society
Journal Title: Journal of Atmospheric and Oceanic Technology
Volume: 20
Issue: 11
Start Page: 1534
End Page: 1542
Publisher DOI: 10.1175/1520-0426(2003)020<1534:POTMSW>2.0.CO;2
Abstract: The ‘‘Snow White’’ hygrometer is a low-cost, chilled-mirror hygrometer for radiosonde applications provided by a Swiss company, Meteolabor AG. A total of 54 Snow White soundings were conducted at five tropical stations in different seasons in 2000–01. All soundings were made with Vaisala RS80 radiosondes equipped either with the A-Humicap (22 soundings) or H-Humicap (32) relative humidity (RH) sensor. Comparisons of the RH with respect to liquid water between the Snow White and the different RS80 Humicap sensors are made. The Snow White measurements show reasonable agreement with the H-Humicap measurements from the surface up to ;12 km (above 2508C air temperature), the region where the H-Humicap sensor can be considered reliable. Above 12 km, the H-Humicap sensor tends to miss small vertical-scale structures in RH due to the time lag error, but on average both instruments show no significant difference up to 14 km (2658C). The comparison between the Snow White and A-Humicap sensors shows the known A-Humicap dry bias error at low temperatures and second dry bias error in the wet lower troposphere. The latter error [(A-Humicap RH) . 0.9 3 (Snow White RH) above 50% RH] may be a common problem for the recent A-Humicap sensors. These intercomparisons confirm the validity of the Snow White measurements at least up to the tropical upper troposphere and above 3%–6% RH.
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/2115/64839
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

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