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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10815
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dc.date.accessioned2018-02-27T08:53:46Zen
dc.date.available2018-02-27T08:53:46Zen
dc.date.issued2018en
dc.identifier.urihttp://hdl.handle.net/2122/10815en
dc.description.abstractThe new ground-based 22 GHz spectrometer, VESPA-22 (water Vapor Emission Spectrometer for Polar Atmosphere at 22 GHz) measures the 22.23 GHz water vapor emission line with a bandwidth of 500MHz and a frequency resolution of 31 kHz. The integration time for a measurement ranges from 6 to 24 h, depending on season and weather conditions. Water vapor spectra are collected using the beam-switching technique. VESPA-22 is designed to operate automatically with little maintenance; it employs an uncooled front-end characterized by a receiver temperature of about 180K and its quasi-optical system presents a full width at half maximum of 3.5 . Every 30 min VESPA-22 measures also the sky opacity using the tipping curve technique. The instrument calibration is performed automatically by a noise diode; the emission temperature of this element is estimated twice an hour by observing alternatively a black body at ambient temperature and the sky at an elevation of 60 . The retrieved profiles obtained inverting 24 h integration spectra present a sensitivity larger than 0.8 from about 25 to 75 km of altitude during winter and from about 30 to 65 km during summer, a vertical resolution from about 12 to 23 km (depending on altitude), and an overall 1 uncertainty lower than 7% up to 60 km altitude and rapidly increasing to 20% at 75 km. In July 2016, VESPA-22 was installed at the Thule High Arctic Atmospheric Observatory located at Thule Air Base (76.5 N, 68.8 W), Greenland, and it has been operating almost continuously since then. The VESPA-22 water vapor mixing ratio vertical profiles discussed in this work are obtained from 24 h averaged spectra and are compared with version 4.2 of concurrent Aura/Microwave Limb Sounder (MLS) water vapor vertical profiles. In the sensitivity range of VESPA-22 retrievals, the intercomparison from July 2016 to July 2017 between VESPA-22 dataset and Aura/MLS dataset convolved with VESPA-22 averaging kernels shows an average difference within 1.4% up to 60 km altitude and increasing to about 6% (0.2 ppmv) at 72 km.en
dc.description.sponsorshipItalian Antarctic Programme (PNRA) funded by MIUR through projects 2013/C3.03 and 2015/B3.01. Progetto Premiale ARCA.en
dc.language.isoEnglishen
dc.publisher.nameEGU, Copernicus Publicationsen
dc.relation.ispartofAtmospheric Measurement Techniquesen
dc.relation.ispartofseries/11 (2018)en
dc.subjectstratospheric water vapor, microwave spectrometer, Polaren
dc.titleVESPA-22: a ground-based microwave spectrometer for long-term measurements of polar stratospheric water vaporen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber1099-2018en
dc.identifier.URLhttps://www.atmos-meas-tech.net/11/1099/2018/en
dc.subject.INGV01.01. Atmosphereen
dc.identifier.doi10.5194/amt-11-1099-2018en
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dc.description.obiettivoSpecifico5A. Paleoclima e ricerche polarien
dc.description.journalTypeJCR Journalen
dc.relation.issn1867-1381en
dc.relation.eissn1867-8548en
dc.contributor.authorMevi, Gabrieleen
dc.contributor.authorMuscari, Giovannien
dc.contributor.authorBertagnolio, Pietro Paoloen
dc.contributor.authorFiorucci, Ireneen
dc.contributor.authorPace, Giandomenicoen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptUniversità degli Studi di Roma «La Sapienza», Roma, Italy-
crisitem.author.orcid0000-0003-3625-6166-
crisitem.author.orcid0000-0001-6326-2612-
crisitem.author.orcid0000-0002-3208-6756-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent01. Atmosphere-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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