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New Zealand 20th century sea level rise : Resolving the vertical land motion using space geodetic and geological data / Abdelali Fadil in Journal of geophysical research : Oceans, vol 118 n° 11 (November 2013)  

Public [article]  inJournal of geophysical research : Oceans > vol 118 n° 11 (November 2013) . - pp 6076 - 6091 Titre : New Zealand 20th century sea level rise : Resolving the vertical land motion using space geodetic and geological data Type de document : Article/Communication Auteurs : Abdelali Fadil, Auteur ; Paul Denys, Auteur ; Robert Tenzer, Auteur ; Hugh R. Grenfell, Auteur ; Pascal Willis , Auteur Année de publication : 2013 Article en page(s) : pp 6076 - 6091 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation verticale de la croute terrestre [Termes IGN] données géologiques [Termes IGN] données marégraphiques [Termes IGN] marais salé [Termes IGN] montée du niveau de la mer [Termes IGN] Nouvelle-Zélande Résumé : (Auteur) Investigations in long‐term instrumental tidal records reveal that 20th century sea level along the coast of New Zealand is rising at 1.46 ± 0.10 mm/yr in agreement with the regional rates from southern Australia and Tasmania. We extend the advanced altimeter‐gauge approach of combining satellite altimetry and tide gauge data with constraint equations from long‐term adjacent tide gauge records to assess its performance in open seas and to explore the impact of vertical land motion on the observed relative sea level. This approach has again proven to be a robust method with an accuracy of 0.4 mm/yr. While no clear sea level rise pattern can be inferred once the tide gauge apparent sea level trends are corrected for vertical land motions from GPS, the advanced altimeter‐gauge and geological vertical rates are completely consistent and reveal three temporal phases of sea level rise marked by an increase from 1.46 ± 0.10 mm/yr to 1.72 ± 0.10 mm/yr during the period (1900–1936), followed by a decrease to 1.48 ± 0.10 mm/yr during the period (1936–1956), and a substantial increase to 2.60 ± 0.10 mm/yr during the period (1956–1975). In contrast, the 20th century microfossil proxy records of absolute sea level rise display twice the tide gauge sea level rise rate of 3.17 ± 0.30 mm/yr and 3.28 ± 0.45 mm/yr, respectively, once salt‐marsh records are corrected using GPS and geological vertical rates. Differential autocompaction and transfer functions are possible factors, which need further investigation. Numéro de notice : A2013-839 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/2013JC008867 Date de publication en ligne : 22/10/2013 En ligne : https://doi.org/10.1002/2013JC008867 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91302 [article]

Study of seasonal-scale atmospheric water cycle with ground-based GPS receivers, radiosondes and NWP models over Morocco / Achraf Koulali in Atmospheric Research, vol 104 - 105 (February 2012)  

Public [article]  inAtmospheric Research > vol 104 - 105 (February 2012) . - pp 273 - 291 Titre : Study of seasonal-scale atmospheric water cycle with ground-based GPS receivers, radiosondes and NWP models over Morocco Type de document : Article/Communication Auteurs : Achraf Koulali, Auteur ; Driss Ouazar, Auteur ; Olivier Bock , Auteur ; Abdelali Fadil, Auteur Année de publication : 2012 Article en page(s) : pp 273 - 291 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Canaries [Termes IGN] circulation atmosphérique [Termes IGN] données GPS [Termes IGN] données météorologiques [Termes IGN] Maroc [Termes IGN] précipitation [Termes IGN] radiosondage [Termes IGN] récepteur GPS [Termes IGN] retard troposphérique zénithal [Termes IGN] teneur en vapeur d'eau [Termes IGN] variation saisonnière Résumé : (Auteur) This study investigates the seasonal variation of precipitable water vapor, moisture transport and precipitation over Morocco and the Canary Islands using data from ground-based GPS receivers, radiosondes, GPCP and NCEP reanalysis II. In a first part, the datasets are inter-compared. Humidity biases are evidenced in both radiosonde observations (dry) and NCEP reanalysis (dry and wet) compared to GPS. Moisture transport and precipitation from the reanalysis and observations show a good agreement. Precipitable water shows a maximum in late summer whereas precipitation is peaking in winter and spring over Morocco. Moisture transport occurs preferentially in two layers, below and above 850 hPa. The monthly mean precipitable water variation over Morocco is controlled by the upper layer zonal and meridional moisture flux. Precipitation is rather controlled by the lower layer moisture flux and the upper layer meridional flux. The GPS tropospheric gradients show also a consistent seasonal evolution, which is explained by gradients both in the thickness of the troposphere and in the precipitable water vapor. Tropospheric gradients are correlated with moisture fluxes, mostly in the upper layer, and may therefore provide valuable information for meteorology and climatology. Numéro de notice : A2012-737 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.atmosres.2011.11.002 Date de publication en ligne : 13/11/2011 En ligne : https://doi.org/10.1016/j.atmosres.2011.11.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91460 [article]

Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records / Abdelali Fadil in Comptes rendus : Géoscience, vol 343 n° 5 (May 2011)  

Public [article]  inComptes rendus : Géoscience > vol 343 n° 5 (May 2011) . - pp 331 - 341 Titre : Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records Titre original : Indications d’une subsidence lente de l’île de Tahiti par analyse de données de positionnement GPS et DORIS, ainsi que par combinaison de données de suivi du niveau de la mer, d’altimétrie et de marégraphie Type de document : Article/Communication Auteurs : Abdelali Fadil, Auteur ; Lydie Sichoix, Auteur ; Jean-Pierre Barriot, Auteur ; Pascal Ortéga, Auteur ; Pascal Willis , Auteur Année de publication : 2011 Article en page(s) : pp 331 - 341 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] coordonnées GPS [Termes IGN] déformation verticale de la croute terrestre [Termes IGN] données altimétriques [Termes IGN] données DORIS [Termes IGN] données marégraphiques [Termes IGN] montée du niveau de la mer [Termes IGN] rebond post-glaciaire [Termes IGN] récif corallien [Termes IGN] subsidence [Termes IGN] Tahiti [Termes IGN] vitesse Résumé : (auteur) Monitoring vertical land motion is of crucial interest in observations of long-term sea level change and its reconstruction, but is among of the most, yet highly challenging, tasks of space geodesy. The aim of the paper is to compare the vertical velocity estimates of Tahiti Island obtained from five independent geophysical measurements, namely a decade of GPS and DORIS data, 17 years sea level difference (altimeter minus tide gauge (TG)) time series, ICE-5G (VM2 L90) Post-Glacial Rebound (PGR) model predictions, and coral reef stratigraphy. Except for the Glacial Isostatic Adjustment (GIA also known as PGR) model, all the techniques are in a good agreement and reveal a very slow subsidence of the Tahiti Island averaged at −0.5 mm/yr which is barely significant. Nevertheless, despite of that vertical motion, Tahiti remains an ideal location for the calibration of satellite altimeter measurements. Numéro de notice : A2011-602 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.1016/j.crte.2011.02.002 Date de publication en ligne : 02/05/2011 En ligne : https://doi.org/10.1016/j.crte.2011.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91676 [article]