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Measurements of low amounts of precipitable water vapor by millimeter wave spectroscopy: An intercomparison with radiosonde, Raman lidar, and Fourier transform infrared data

TitoloMeasurements of low amounts of precipitable water vapor by millimeter wave spectroscopy: An intercomparison with radiosonde, Raman lidar, and Fourier transform infrared data
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2008
AutoriFiorucci, I., Muscari G., Bianchi C., Di Girolamo P., Esposito F., Grieco G., Summa D., Bianchini G., Palchetti L., Cacciani M., Di Iorio Tatiana, Pavese G., Cimini D., and de Zafra R.L.
RivistaJournal of Geophysical Research Atmospheres
Volume113
ISSN01480227
Parole chiaveAtmospheric chemistry, Atmospheric opacity, Atmospherics, Cervinia, Conventional instruments, Cooling water, Data sets, Earth cooling, Field campaign, Fourier Transform Infrared, Fourier transform spectrometers, Fourier transforms, FTIR spectroscopy, Ground based, High mountains, infrared spectroscopy, Intercomparisons, lidar, Linear relationships, Millimeter wave devices, Millimeter waves, Millimeter-wave spectrometers, Millimeter-wave spectroscopy, Number of datum, Optical radar, polar region, Polar regions, precipitable water, Precipitable water vapor, radiosonde, Radiosondes, Raman lidar, Spectrometers, Spectrometry, Water vapor
Abstract

Observations of very low amounts of precipitable water vapor (PWV) by means of the Ground-Based Millimeter wave Spectrometer (GBMS) are discussed. Low amounts of column water vapor (between 0.5 and 4 mm) are typical of high mountain sites and polar regions, especially during winter, and are difficult to measure accurately because of the lack of sensitivity of conventional instruments to such low PWV contents. The technique used involves the measurement of atmospheric opacity in the range between 230 and 280 GHz with a spectral resolution of 4 GHz, followed by the conversion to precipitable water vapor using a linear relationship. We present the intercomparison of this data set with simultaneous PWV observations obtained with Vaisala RS92k radiosondes, a Raman lidar, and an IR Fourier transform spectrometer. These sets of measurements were carried out during the primary field campaign of the Earth Cooling by Water vapor Radiation (ECOWAR) project which took place at Breuil-Cervinia (45.9°N, 7.6°E, elevation 1990 m) and Plateau Rosa (45.9°N, 7.7°E, elevation 3490 m), Italy, from 3 to 16 March 2007. GBMS PWV measurements show a good agreement with the other three data sets exhibiting a mean difference between observations of ∼9%. The considerable number of data points available for the GBMS versus lidar PWV correlation allows an additional analysis which indicates negligible systematic differences between the two data sets. Copyright 2008 by the American Geophysical Union.

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cited By 15

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-72049104826&doi=10.1029%2f2008JD009831&partnerID=40&md5=bcf11a93136f14e0c0afbb89438fc498
DOI10.1029/2008JD009831
Citation KeyFiorucci2008