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The effect of regional sea level atmospheric pressure on sea level variations at globally distributed tide gauge stations with long records / H. Baki Iz in Journal of geodetic science, vol 8 n° 1 (January 2018)  

Public [article]  inJournal of geodetic science > vol 8 n° 1 (January 2018) . - pp 55 - 71 Titre : The effect of regional sea level atmospheric pressure on sea level variations at globally distributed tide gauge stations with long records Type de document : Article/Communication Auteurs : H. Baki Iz, Auteur Année de publication : 2018 Article en page(s) : pp 55 - 71 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] changement climatique [Termes descripteurs IGN] changement du niveau de la mer [Termes descripteurs IGN] données marégraphiques [Termes descripteurs IGN] marégraphe [Termes descripteurs IGN] niveau de la mer [Termes descripteurs IGN] pression atmosphérique [Termes descripteurs IGN] série temporelle Résumé : (Auteur) This study provides additional information about the impact of atmospheric pressure on sea level variations. The observed regularity in sea level atmospheric pressure depends mainly on the latitude and verified to be dominantly random closer to the equator. It was demonstrated that almost all the annual and semiannual sea level variations at 27 globally distributed tide gauge stations can be attributed to the regional/local atmospheric forcing as an inverted barometric effect. Statistically significant non-linearities were detected in the regional atmospheric pressure series, which in turn impacted other sea level variations as compounders in tandem with the lunar nodal forcing, generating lunar sub-harmonics with multidecadal periods. It was shown that random component of regional atmospheric pressure tends to cluster at monthly intervals. The clusters are likely to be caused by the intraannual seasonal atmospheric temperature changes,which may also act as random beats in generating sub-harmonics observed in sea level changes as another mechanism. This study also affirmed that there are no statistically significant secular trends in the progression of regional atmospheric pressures, hence there was no contribution to the sea level trends during the 20th century by the atmospheric pressure.Meanwhile, the estimated nonuniform scale factors of the inverted barometer effects suggest that the sea level atmospheric pressure will bias the sea level trends inferred from satellite altimetry measurements if their impact is accounted for as corrections without proper scaling. Numéro de notice : A2018-615 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jogs-2018-0007 date de publication en ligne : 30/05/2018 En ligne : https://doi.org/10.1515/jogs-2018-0007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92663 [article]

Acceleration of the global coastal sea level rise during the 20th century re-evaluated / H. Baki Iz in Journal of geodetic science, vol 7 n° 1 (February 2017)  

Public [article]  inJournal of geodetic science > vol 7 n° 1 (February 2017) . - pp 51 - 58 Titre : Acceleration of the global coastal sea level rise during the 20th century re-evaluated Type de document : Article/Communication Auteurs : H. Baki Iz, Auteur Année de publication : 2017 Article en page(s) : pp 51 - 58 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] autocorrélation [Termes descripteurs IGN] changement climatique [Termes descripteurs IGN] changement du niveau de la mer [Termes descripteurs IGN] données marégraphiques [Termes descripteurs IGN] niveau de la mer [Termes descripteurs IGN] niveau moyen des mers Résumé : (Auteur) In contrast to some of the recent investigations, this study shows that far less number of tide gauge stations experienced statistically significant accelerations in sea level rise during the 20th century. Twenty-seven tide gauge stations with century long data were analyzed for the presence of an acceleration in global sea level rise using a kinematic model inclusive of a secular trend, acceleration, and compounded periodicities with autocorrelated random effects. Eight out of twenty-seven stations revealed statistically significant but slow sea level rise acceleration (p Numéro de notice : A2017-301 Thématique : POSITIONNEMENT Nature : Article En ligne : https://doi.org/10.1515/jogs-2017-0006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85336 [article]

Polar motion modeling, analysis, and prediction with time dependent harmonic coefficients / H. Baki Iz in Journal of geodesy, vol 82 n° 12 (December 2008)

Public [article]  inJournal of geodesy > vol 82 n° 12 (December 2008) . - pp 871 - 881 Titre : Polar motion modeling, analysis, and prediction with time dependent harmonic coefficients Type de document : Article/Communication Auteurs : H. Baki Iz, Auteur Année de publication : 2008 Article en page(s) : pp 871 - 881 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes descripteurs IGN] modèle de simulation [Termes descripteurs IGN] mouvement du pôle [Termes descripteurs IGN] série temporelle [Termes descripteurs IGN] terme de Chandler Résumé : (Auteur) A time dependent amplitude model was proposed for the analysis and prediction of polar motion time series. The formulation was implemented to analyze part of the new combined solution, EOP (IERS) C 04, daily polar motion time series of 14 years length using a statistical model with first order autoregressive disturbances. A new solution approach, where the serial correlations of the disturbances are eliminated by sequentially differencing the measurements, was used to estimate the model parameters using weighted least squares. The new model parsimoniously represents the 14-year time series with 0.5 mas rms fit, close to the reported 0.1 mas observed pole position precisions for the x and y components. The model can also predict 6 months into the future with less than 4 mas rms prediction error for both polar motion components, and down to sub mas for one-step ahead prediction as validated using a set of daily time series data that are not used in the estimation. Copyright Springer Numéro de notice : A2008-471 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29540 [article]

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