Descripteur
Termes IGN > 1-Candidats > variation temporelle
variation temporelle |
Documents disponibles dans cette catégorie (220)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Understanding sea-level rise and variability / J.A. Church (2010)
Titre : Understanding sea-level rise and variability Type de document : Monographie Auteurs : J.A. Church, Éditeur scientifique ; Philip L. Woodworth, Éditeur scientifique ; T. Aarup, Éditeur scientifique ; et al., Auteur Editeur : Chichester : Wiley-Blackwell Année de publication : 2010 Importance : 428 p. Format : 19 x 25 cm ISBN/ISSN/EAN : 978-1-4443-3451-7 Langues : Anglais (eng) Descripteur : [Termes IGN] changement climatique
[Termes IGN] niveau de la mer
[Termes IGN] océanographie dynamique
[Termes IGN] repère de référence
[Termes IGN] salinité
[Termes IGN] série temporelle
[Termes IGN] surcharge océanique
[Termes IGN] variation séculaire
[Vedettes matières IGN] AltimétrieIndex. décimale : 30.52 Marégraphie et niveau moyen des mers Résumé : (Auteur) Sea-level rise is one of the most obvious manifestations of anthropogenic climate change, and it directly threatens coasts as a result of increased erosion, more frequent storm-surge flooding and loss of habitat. However, the wide range of uncertainty in projections of global and regional sea-level rise presented by the Intergovernmental Panel on Climate Change is a significant hindrance in agreeing to appropriate mitigation levels and in planning adaptation measures. A workshop in June 2006, organized under the auspices of the World Climate Research Programme (WCRP) to address this issue, led to publication of this book. Understanding Sea-Level Rise and Variability identifies the major impacts of sea-level rise, presents up-to-date assessments of past sea-level change, thoroughly explores all of the factors contributing to sea-level rise, and explores how sea-level extreme events might change. It identifies what is known in each area and what research and observations are required to reduce the uncertainties in our understanding of sea-level rise so that more reliable future projections can be made. A synthesis of findings provides a concise summary of sea-level rise and its impacts on society. The book is for everyone interested in sea-level rise and its impacts, including policy makers, research funders, scientists, students, coastal managers and engineers. Note de contenu : Foreword
1 Introduction
2 Impacts of and Responses to Sea-Level Rise
2.1 Introduction
2.2 Climate Change and Global/Relative Sea-Level Rise
2.3 Sea-Level Rise and Resulting Impacts
2.4 Framework and Methods for the Analysis of Sea-Level-Rise Impacts
2.5 Recent Impacts of Sea Level Rise
2.6 Future Impacts of Sea-Level Rise
2.7 Responding to Sea-Level Rise
2.8 Next Steps
2.9 Concluding Remarks Acknowledgments - References
3 A First-Order Assessment of the Impact of Long-Term Trends in Extreme Sea Levels on Offshore Structures and Coastal Refineries
3.1 Introduction
3.2 Design Considerations
3.3 Impact of Long-Term Trends in Extreme Sea Levels
3.4 Evaluating the Economic Impact57
3.5 Conclusions - References
4 Paleoenvironmental Records, Geophysical Modeling, and Reconstruction of Sea-Level Trends and Variability on Centennial and Longer Timescales
4.1 Introduction
4.2 Past Sea-Level Changes
4.3 Sea-Level Indicators
4.4 Geophysical Modeling of Variability in Relative Sea-Level History
4.5 Regional Case Studies
4.6 Discussion and Conclusions Acknowledgments References
5 Modern Sea-Level-Change Estimates
5.1 Introduction
5.2 Estimates from Proxy Sea-Level Records
5.3 Estimate of Global Sea-Level Change from Tide Gauges
5.4 Estimates of Global Sea-Level Change- from Satellite Altimetry
5.5 Recommendations - Acknowledgments - References
6 Ocean Temperature and Salinity Contributions to Global and Regional Sea-Level Change
6.1 Introduction
6.2 Direct Estimates of Steric Sea-Level Rise
6.5 Estimating Steric Sea-Level Change Using Ocean Syntheses
6.4 Inferring Steric Sea Level from Tine Variable Gravity and Sea Level
6.5 Modeling Steric Sea-Level Rise
6.6 Conclusions and Recommendations - Acknowledgments - References
7 Cryospheric Contributions to Sea Level Rise and Variability
7.1 Introduction
7.2 Mass-Balance Techniques
7.3 lce Sheet Mass Balance
7.4 Mass Balance of Glaciers and lee Gaps
7.5 Glacier, lce-Cap, and Ice Sheet Modeling
7.6 Summary and Recommendations - References
8 Terrestrial Water-Storage Contributions to Sea-Level Rise and Variability
8.1 Introduction
8.2 Analysis Tools
8.3 Climate-Driven Changes of Terrestrial Water Storage
8.4 Direct Anthropogenic Changes of Terrestrial Water Storage
8.3 Synthesis
8.6 Recommendations - References
9 Geodetic Observations and Global Reference Frame Contributions to Understanding Sea-Level Rise and Variability
9.1 Introduction
9.2 Global and Regional Reference Systems
9.3 Linking GPS to Tide Gauges and Title Gauge Benchmarks
9.4 Recommendations for Geodetic Observations - Acknowledgments - References
10 Surface Mass Loading on a Dynamic Earth: Complexity and Contamination in the Geodetic Analysis of Global Sea Level Trends
10.1 Introduction
10.2 Glacial Isostatic Adjustment
10.3 Sea Level, Sea Surface, and the Geoid
10.4 Rapid Melting and Sea-Level Fingerprints
10.5 Great Earthquakes
10.6 Final Remarks Acknowledgments - References
11 Past and Future Changes in Extreme Sea Levels and Waves
11.1 Introduction
11.2 Evidence for Changes in Extreme Sea Levels and Waves in the Recent Past
11.3 Mid-Latitude and Tropical Storms: Changes in the Atmospheric Drivers of Extreme Sea Level
11.4 Future Extreme Water Levels
11.5 Future Research Needs
11.6 Conclusions Acknowledgments - References
12 Observing Systems Needed to Address Sea-Level Rise and Variability
12.1 Introduction
12.2 Sustained, Systematic Observing Systems (Existing Capabilities)
12.3 Development of Improved Observing Systems (New Capabilities)
12.4 Summary - References
13 Sea Level Rise and Variability: Synthesis and Outlook for the Future
13.1 Historical Sea-Level Change
13.2 Why is Sea Level Rising?
13.3 The Regional Distribution of Sea-Level Rise
13.4 Projections of Sea-Level Rise for the 21st Century and Beyond
13.5 Changes in Extreme Events
13.6 Sea Level and Society - ReferencesNuméro de notice : 14185 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Recueil / ouvrage collectif Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40507 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 14185-01 30.52 Livre Centre de documentation Géodésie Disponible Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya / Mireille Flouzat in Geophysical journal international, vol 178 n° 3 (September 2009)
[article]
Titre : Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya Type de document : Article/Communication Auteurs : Mireille Flouzat, Auteur ; Pierre Bettinelli, Auteur ; Pascal Willis , Auteur ; Jean-Philippe Avouac, Auteur ; Thierry Héritier, Auteur ; Umesh Gautam, Auteur Année de publication : 2009 Projets : 1-Pas de projet / Article en page(s) : pp 1246 - 1259 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] Himalaya
[Termes IGN] propagation troposphérique
[Termes IGN] série temporelle
[Termes IGN] variation saisonnièreRésumé : (auteur) Geodetic time-series from continuous GPS (cGPS) and 1 DORIS stations across the Himalaya of central Nepal show strong seasonal fluctuations observed on the horizontal and vertical components. Because the fluctuations determined at the different stations have similar phase but different amplitudes, these observations would imply that the secular shortening across the range is modulated by a seasonal strain. Given the geographic and climatic setting, there is however a possibility that the GPS positions be biased by tropospheric effects. We process these data using two different software packages and two different analysis strategies. Our analysis shows evidence for 1-strong seasonal fluctuation of zenithal delays consistent with in situ meteorological data and two strong horizontal tropospheric gradients in particular in the EW direction, that is, parallel to the mountain front at Gumba, also detected in DORIS results. We show that the tropospheric effects cannot however be the source of the observed seasonality of horizontal strain. This study supports the view that the seasonal strain in the Himalaya is real and probably driven by seasonal surface load variations. Our study adds support to the view that seasonal variations of seismicity in the Himalaya reflects seasonal variations of geodetic strain. Numéro de notice : A2009-604 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2009.04252.x En ligne : https://doi.org/10.1111/j.1365-246X.2009.04252.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95755
in Geophysical journal international > vol 178 n° 3 (September 2009) . - pp 1246 - 1259[article]Verification of NWP model analyses and radiosonde humidity data with GPS precipitable water vapor estimates during AMMA / Olivier Bock in Weather and Forecasting, vol 24 n° 4 (August 2009)
[article]
Titre : Verification of NWP model analyses and radiosonde humidity data with GPS precipitable water vapor estimates during AMMA Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Mathieu Nuret, Auteur Année de publication : 2009 Projets : AMMA & AMMA-2 / Janicot, Serge Article en page(s) : pp 1085 - 1101 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] erreur systématique
[Termes IGN] mousson
[Termes IGN] précipitation
[Termes IGN] prédiction
[Termes IGN] prévision météorologique
[Termes IGN] radiosondage
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] variation diurneRésumé : (auteur) This paper assesses the performance of the European Centre for Medium-Range Weather Forecasts-Integrated Forecast System (ECMWF-IFS) operational analysis and NCEP–NCAR reanalyses I and II over West Africa, using precipitable water vapor (PWV) retrievals from a network of ground-based GPS receivers operated during the African Monsoon Multidisciplinary Analysis (AMMA). The model analyses show reasonable agreement with GPS PWV from 5-daily to monthly means. Errors increase at shorter time scales, indicating that these global NWP models have difficulty in handling the diurnal cycle and moist processes at the synoptic scale. The ECMWF-IFS analysis shows better agreement with GPS PWV than do the NCEP–NCAR reanalyses (the RMS error is smaller by a factor of 2). The model changes in ECMWF-IFS were not clearly reflected in the PWV error over the period of study (2005–08). Radiosonde humidity biases are diagnosed compared to GPS PWV. The impacts of these biases are evidenced in all three model analyses at the level of the diurnal cycle. The results point to a dry bias in the ECMWF analysis in 2006 when Vaisala RS80-A soundings were assimilated, and a diurnally varying bias when Vaisala RS92 or Modem M2K2 soundings were assimilated: dry during day and wet during night. The overall bias is offset to wetter values in NCEP–NCAR reanalysis II, but the diurnal variation of the bias is observed too. Radiosonde bias correction is necessary to reduce NWP model analysis humidity biases and improve precipitation forecast skill. The study points to a wet bias in the Vaisala RS92 data at nighttime and suggests that caution be used when establishing a bias correction scheme. Numéro de notice : A2009-576 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1175/2009WAF2222239.1 Date de publication en ligne : 01/08/2009 En ligne : https://doi.org/10.1175/2009WAF2222239.1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102424
in Weather and Forecasting > vol 24 n° 4 (August 2009) . - pp 1085 - 1101[article]Landsat sub-pixel analysis in mapping impact of climatic variability on prairie pothole changes / B. Zhang in Transactions in GIS, vol 13 n° 2 (April 2009)
[article]
Titre : Landsat sub-pixel analysis in mapping impact of climatic variability on prairie pothole changes Type de document : Article/Communication Auteurs : B. Zhang, Auteur ; F. Schwartz, Auteur ; D. Tong, Auteur Année de publication : 2009 Article en page(s) : pp 179 - 195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse infrapixellaire
[Termes IGN] cartographie thématique
[Termes IGN] changement climatique
[Termes IGN] classification ascendante hiérarchique
[Termes IGN] classification par arbre de décision
[Termes IGN] classification pixellaire
[Termes IGN] Dakota du Sud (Etats-Unis)
[Termes IGN] détection de changement
[Termes IGN] image Landsat
[Termes IGN] lac
[Termes IGN] sécheresse
[Termes IGN] système d'information géographique
[Termes IGN] variation saisonnière
[Termes IGN] zone humideRésumé : (Auteur) The Prairie Pothole Region in the United States contains millions of seasonal, semi-permanent, or permanent lakes and wetlands that typically range in size from 0.1 to 10 ha. These lakes and wetlands are vulnerable to climate change, especially in our study area in South Dakota, in which a period of deluge following a sharp drought considerably expanded the areal extent of prairie pothole lakes during the last decade of the twentieth century. Preliminary estimates of lake areas, determined using LANDSAT 5 and 7 images, had appreciable errors especially for the smallest of these lakes. This article describes a new sub-pixel approach integrated with a CART (Classification and Regression Tree) model using a GIS (Geographical Information System) to quantify mixed water pixels along lake boundaries to improve area estimations for pothole lakes. Errors in estimated area were typically 10% or less for lakes greater than 1 ha in size. An analysis of lakes in our study area demonstrates how lake area changed with the transition from drought to deluge. Small lakes exhibited a distinct seasonal variation in contrast to large lakes that tended to follow precipitation trends more broadly. The total water area of lakes is consistent with broad variation in rainfall. Numéro de notice : A2009-541 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01149.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01149.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30170
in Transactions in GIS > vol 13 n° 2 (April 2009) . - pp 179 - 195[article]West African Monsoon observed with ground-based GPS receivers during African Monsoon Multidisciplinary Analysis (AMMA) / Olivier Bock in Journal of geophysical research : Atmospheres, vol 113 n° D21 (16 November 2008)
[article]
Titre : West African Monsoon observed with ground-based GPS receivers during African Monsoon Multidisciplinary Analysis (AMMA) Type de document : Article/Communication Auteurs : Olivier Bock , Auteur ; Marie-Noëlle Bouin , Auteur ; Erik Doerflinger, Auteur ; Philippe Collard, Auteur ; Florian Masson, Auteur ; Rémi Meynadier, Auteur ; Samuel Nahmani , Auteur ; et al., Auteur Année de publication : 2008 Projets : AMMA & AMMA-2 / Janicot, Serge Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] circulation atmosphérique
[Termes IGN] données GPS
[Termes IGN] erreur systématique
[Termes IGN] humidité de l'air
[Termes IGN] modèle de simulation
[Termes IGN] mousson
[Termes IGN] phénomène atmosphérique
[Termes IGN] précipitation
[Termes IGN] vapeur d'eau
[Termes IGN] variation saisonnièreRésumé : (auteur) A ground-based GPS network has been established over West Africa in the framework of African Monsoon Multidisciplinary Analysis (AMMA) in tight cooperation between French and African institutes. The experimental setup is described and preliminary highlights are given for different applications using these data. Precipitable water vapor (PWV) estimates from GPS are used for evaluating numerical weather prediction (NWP) models and radiosonde humidity data. Systematic tendency errors in model forecasts are evidenced. Correlated biases in NWP model analyses and radiosonde data are evidenced also, which emphasize the importance of radiosonde humidity data in this region. PWV and precipitation are tightly correlated at seasonal and intraseasonal timescales. Almost no precipitation occurs when PWV is smaller than 30 kg m−2. This limit in PWV also coincides well with the location of the intertropical discontinuity. Five distinct phases in the monsoon season are determined from the GPS PWV, which correspond either to transition or stationary periods of the West African Monsoon system. They may serve as a basis for characterizing interannual variability. Significant oscillations in PWV are observed with 10- to 15-day and 15- to 20-day periods, which suggest a strong impact of atmospheric circulation on moisture and precipitation. The presence of a diurnal cycle oscillation in PWV with marked seasonal evolutions is found. This oscillation involves namely different phasing of moisture fluxes in different layers implying the low-level jet, the return flow, and the African Easterly Jet. The broad range of timescales observed with the GPS systems shows a high potential for investigating many atmospheric processes of the West African Monsoon. Numéro de notice : A2008-656 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2008JD010327 Date de publication en ligne : 05/11/2008 En ligne : https://doi.org/10.1029/2008JD010327 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98266
in Journal of geophysical research : Atmospheres > vol 113 n° D21 (16 November 2008)[article]Ten years of fluxes and stand growth in a young beech forest at Hesse, North-eastern France / André Granier in Annals of Forest Science, Vol 65 n° 7 (October - November 2008)PermalinkRetrieving earthquake signature in GRACE gravity solutions / Olivier de Viron in Geophysical journal international, vol 174 n° 1 (July 2008)PermalinkUse of a Kalman filter for the retrieval of surface BRDF coefficients with a time-evolving model based on the ECOCLIMAP land cover classification / O. Samain in Remote sensing of environment, vol 112 n° 4 (15/04/2008)PermalinkSeasonal sensitivity analysis of impervious surface estimation with satellite imagery / C. Wu in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 12 (December 2007)PermalinkUsing remote sensing data to develop seasonal outlooks for Arctic regional sea-ice minimum extent / S. Drobot in Remote sensing of environment, vol 111 n° 2-3 (30 November 2007)PermalinkDual-frequency altimeter signal from Envisat on the Amery ice-shelf / Pascal Lacroix in Remote sensing of environment, vol 109 n° 3 (15 August 2007)PermalinkEvaluating NDVI-based emissivities of MODIS bands 31 and 32 using emissivities derived by day/night LST algorithm / M. Momeni in Remote sensing of environment, vol 106 n° 2 (30/01/2007)PermalinkReflectance seasonality and its relation to the canopy leaf area index in an eastern Siberian larch forest: Multi-satellite data and radiative transfer analyses / H. Kobayashi in Remote sensing of environment, vol 106 n° 2 (30/01/2007)PermalinkEvaluation of the potential of SAR ERS and ASAR Envisat sensors in multi-incidence and multi-polarisation modes for landscape study in French Guyana: examples of Kourou and Saint Laurent du Maroni / J.L. Kouame in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)PermalinkMesures et caractérisation des changements d'occupation des sols à partir de l'analyse diachronique de données satellitales : application à la zone humide d'Akgöl (Turquie) / D. Gramond in Photo interprétation, vol 41 n° 4 (Novembre 2005)Permalink