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Global IWV trends and variability in atmospheric reanalyses and GPS observations / Ana-Claudia Bernardes Parracho in Atmospheric chemistry and physics, vol 18 n° 22 ([01/11/2018])  

Public [article]  inAtmospheric chemistry and physics > vol 18 n° 22 [01/11/2018] . - pp 16213 - 16237 Titre : Global IWV trends and variability in atmospheric reanalyses and GPS observations Type de document : Article/Communication Auteurs : Ana-Claudia Bernardes Parracho , Auteur ; Olivier Bock , Auteur ; Sophie Bastin, Auteur Année de publication : 2018 Projets : REMEMBER / Drobinski, Philippe Article en page(s) : pp 16213 - 16237 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Afrique (géographie physique) [Termes IGN] analyse diachronique [Termes IGN] Antarctique [Termes IGN] circulation atmosphérique [Termes IGN] données GPS [Termes IGN] données météorologiques [Termes IGN] erreur systématique [Termes IGN] hémisphère Sud [Termes IGN] humidité de l'air [Termes IGN] température de surface [Termes IGN] teneur intégrée en vapeur d'eau [Termes IGN] variabilité Résumé : (auteur) This study investigates the means, variability, and trends in integrated water vapour (IWV) from two modern reanalyses (ERA-Interim and MERRA-2) from 1980 to 2016 and ground-based GPS data from 1995 to 2010. It is found that the mean distributions and inter-annual variability in IWV in the reanalyses and GPS are consistent, even in regions of strong gradients. ERA-Interim is shown to exhibit a slight moist bias in the extra-tropics and a slight dry bias in the tropics (both on the order of 0.5 to 1 kg m−2) compared to GPS. ERA-Interim is also generally drier than MERRA-2 over the ocean and within the tropics. Differences in variability and trends are pointed out at a few GPS sites. These differences can be due to representativeness errors (for sites located in coastal regions and regions of complex topography), gaps and inhomogeneities in the GPS series (due to equipment changes), or potential inhomogeneities in the reanalyses (due to changes in the observing system). Trends in IWV and surface temperature in ERA-Interim and MERRA-2 are shown to be consistent, with positive IWV trends generally correlated with surface warming, but MERRA-2 presents a more general global moistening trend compared to ERA-Interim. Inconsistent trends are found between the two reanalyses over Antarctica and most of the Southern Hemisphere, and over central and northern Africa. The uncertainty in current reanalyses remains quite high in these regions, where few in situ observations are available, and the spread between models is generally important. Inter-annual and decadal variations in IWV are also shown to be strongly linked with variations in the atmospheric circulation, especially in arid regions, such as northern Africa and Western Australia, which add uncertainty in the trend estimates, especially over the shorter period. In these regions, the Clausius–Clapeyron scaling ratio is found not to be a good humidity proxy for inter-annual variability and decadal trends. Numéro de notice : A2018-667 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/acp-18-16213-2018 Date de publication en ligne : 15/11/2018 En ligne : http://dx.doi.org/10.5194/acp-18-16213-2018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94260 [article]

First precise results of VLBI observation of the baseline in Antarctic plate / Yoshihiro Fukuzaki in Bulletin of the Geographical survey institute, vol 48 (March 2002)

Public [article]  inBulletin of the Geographical survey institute > vol 48 (March 2002) . - pp 17 - 24 Titre : First precise results of VLBI observation of the baseline in Antarctic plate Type de document : Article/Communication Auteurs : Yoshihiro Fukuzaki, Auteur Année de publication : 2002 Article en page(s) : pp 17 - 24 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Antarctique [Termes IGN] hémisphère Sud [Termes IGN] interférométrie à très grande base [Termes IGN] ligne de base [Termes IGN] positionnement par ITGB Résumé : (Auteur) In the Antarctic region some stations have conducted geodetic observation using space geodetic techniques. At the Syowa Station, regular Very Long Baseline Interferometry (VLBI) observation has been undertaken since 1998. In this session different recording systems were employed. Development of Copy system enabled us to process the data. Meanwhile, since 1992, the O'Higgins Station has been leading an international network involving most of the VLBI stations in the Southern Hemisphere. The Syowa Station has been taking part in this network since 1999 by developing another Copy system, and good results have been obtained. This is the first VLBI observation of the intra-Antarctic plate baseline. Numéro de notice : A2002-373 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22285 [article]

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250-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The problem of the variation of geographical coordinates in the Southern Hemisphere / O. Caceres (1972)

Public Titre : The problem of the variation of geographical coordinates in the Southern Hemisphere Type de document : Actes de congrès Auteurs : O. Caceres, Éditeur scientifique ; Union astronomique internationale, Auteur Congrès : Congrès: IAU 1968, symposium The problem of the variation of geographical coordinates in the Southern Hemisphere (4 - 5 novembre 1968; La Plata, Argentine), Auteur Editeur : la Plata : University of La Plata Année de publication : 1972 Format : 17 x 26 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie [Termes IGN] coordonnées géographiques [Termes IGN] hémisphère Sud Index. décimale : CG1968 Actes de congrès en 1968 Numéro de notice : 10314 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34516

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10314-01	CG.68	Livre	Centre de documentation	En réserve M-103	Disponible