L'ensemble de données NASA NEX-DCP30 est composé de scénarios climatiques réduits pour les États-Unis contigus, qui sont dérivés des exécutions du modèle de circulation générale (GCM) menées dans le cadre du Coupled Model Intercomparison Project Phase 5 (CMIP5, voir Taylor et al. 2012) et des quatre scénarios d'émissions de gaz à effet de serre connus sous le nom de Representative Concentration Pathways (RCP, voir Meinshausen et al. 2011) développés pour le cinquième rapport d'évaluation du Groupe d'experts intergouvernemental sur l'évolution du climat (GIEC AR5). L'objectif de ces ensembles de données est de fournir un ensemble de projections sur le changement climatique à haute résolution et corrigées des biais, qui peuvent être utilisées pour évaluer les impacts du changement climatique sur les processus sensibles aux gradients climatiques à plus petite échelle et aux effets de la topographie locale sur les conditions climatiques.
L'ensemble de données contient des projections mensuelles couvrant les périodes allant de 1950 à 2005 (exécution rétrospective) et de 2006 à 2099 (exécution prospective).
Elle inclut des projections à échelle réduite de 33 modèles. Tous les scénarios ne contiennent pas de projections de chaque modèle.
NEX-DCP30 a été préparé par le groupe Climate Analytics et le centre de recherche NASA Ames à l'aide de NASA Earth Exchange, et distribué par le centre NASA pour la simulation du climat (NCCS).
Bracelets
Taille des pixels 927,67 mètres
Bandes de fréquences
Nom
Unités
Min
Max
Taille des pixels
Description
pr
kg/m^2/s
0*
0,0016*
mètres
Moyenne mensuelle du taux de précipitations quotidiennes en surface ; inclut les phases liquides et solides de tous les types de nuages (à grande échelle et convectifs)
tasmin
K
235.91*
308,97*
mètres
Moyenne mensuelle de la température quotidienne minimale de l'air près de la surface
tasmax
K
246.4*
325,53*
mètres
Moyenne mensuelle de la température maximale quotidienne de l'air près de la surface
* valeur minimale ou maximale estimée
Propriétés des images
Propriétés de l'image
Nom
Type
Description
scénario
STRING
Nom du scénario CMIP5. Il s'agit de l'une des valeurs suivantes : "historical", "rcp26", "rcp45", "rcp60" ou "rcp85". "historical" désigne les exécutions de modèles rétrospectives (avant 2006).
modèle
STRING
Nom du modèle CMIP5. Il s'agit de l'une des valeurs suivantes : "ACCESS1-0", "bcc-csm1-1", "bcc-csm1-1-m", "BNU-ESM", "CanESM2", "CCSM4", "CESM1-BGC", "CESM1-CAM5", "CMCC-CM", "CNRM-CM5", "CSIRO-Mk3-6-0", "FGOALS-g2", "FIO-ESM", "GFDL-CM3", "GFDL-ESM2G", "GFDL-ESM2M", "GISS-E2-H-CC", "GISS-E2-R", "GISS-E2-R-CC", "HadGEM2-AO", "HadGEM2-CC", "HadGEM2-ES", "inmcm4", "IPSL-CM5A-LR", "IPSL-CM5A-MR", "IPSL-CM5B-LR", "MIROC5", "MIROC-ESM", "MIROC-ESM-CHEM", "MPI-ESM-LR", "MPI-ESM-MR", "MRI-CGCM3" ou "NorESM1-M".
Thrasher, B., J. Xiong, W. Wang, F. Melton, A. Michaelis et R. Nemani
(2013), Downscaled Climate Projections Suitable for Resource Management,
Eos Trans. AGU, 94(37), 321.
doi:10.1002/2013EO370002
L'ensemble de données NASA NEX-DCP30 est composé de scénarios climatiques réduits pour les États-Unis contigus, qui sont dérivés des exécutions du modèle de circulation générale (MCG) menées dans le cadre du Coupled Model Intercomparison Project Phase 5 (CMIP5, voir Taylor et al. 2012) et des quatre scénarios d'émissions de gaz à effet de serre connus sous le nom de …
[null,null,[],[[["\u003cp\u003eNEX-DCP30 provides downscaled climate projections for the conterminous United States, derived from CMIP5 models and RCP scenarios.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes monthly projections of precipitation and temperature from 1950 to 2099 at a 927-meter resolution.\u003c/p\u003e\n"],["\u003cp\u003eProjections are available for 33 climate models and four greenhouse gas emissions scenarios (RCPs).\u003c/p\u003e\n"],["\u003cp\u003eNEX-DCP30 was developed by the Climate Analytics Group and NASA, and is freely available for use and distribution.\u003c/p\u003e\n"],["\u003cp\u003eData can be accessed and analyzed using Google Earth Engine.\u003c/p\u003e\n"]]],["The NASA NEX-DCP30 dataset provides downscaled climate projections for the US from 1950 to 2099, derived from CMIP5 GCM runs and IPCC AR5 emissions scenarios. The data, available monthly, includes precipitation rate (`pr`), minimum (`tasmin`) and maximum (`tasmax`) air temperature. It offers projections from 33 models, across historical and future scenarios. The dataset is accessible via the Earth Engine with the snippet: `ee.ImageCollection(\"NASA/NEX-DCP30\")` and is in the public domain.\n"],null,["# NEX-DCP30: NASA Earth Exchange Downscaled Climate Projections\n\nDataset Availability\n: 1950-01-01T00:00:00Z--2099-12-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA / Climate Analytics Group](https://www.nccs.nasa.gov/services/data-collections/land-based-products/nex-dcp30)\n\nCadence\n: 1 Month\n\nTags\n:\n[cag](/earth-engine/datasets/tags/cag) [climate](/earth-engine/datasets/tags/climate) [cmip5](/earth-engine/datasets/tags/cmip5) [geophysical](/earth-engine/datasets/tags/geophysical) [ipcc](/earth-engine/datasets/tags/ipcc) [nasa](/earth-engine/datasets/tags/nasa) [nex](/earth-engine/datasets/tags/nex) [precipitation](/earth-engine/datasets/tags/precipitation) [temperature](/earth-engine/datasets/tags/temperature) \n\n#### Description\n\nThe NASA NEX-DCP30 dataset is comprised of downscaled climate scenarios\nfor the conterminous United States that are derived from the General\nCirculation Model (GCM) runs conducted under the Coupled Model\nIntercomparison Project Phase 5 (CMIP5, see [Taylor et al. 2012](https://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-11-00094.1))\nand across the four greenhouse gas emissions scenarios known as\nRepresentative Concentration Pathways (RCPs, see [Meinshausen et al. 2011](https://rd.springer.com/article/10.1007%2Fs10584-011-0156-z#page-1))\ndeveloped for the Fifth Assessment Report of the Intergovernmental Panel\non Climate Change (IPCC AR5). The purpose of these datasets is to provide\na set of high resolution, bias-corrected climate change projections that\ncan be used to evaluate climate change impacts on processes that are\nsensitive to finer-scale climate gradients and the effects of local\ntopography on climate conditions.\n\nThe dataset contains monthly projections covering the periods from 1950\nthrough 2005 (Retrospective Run) and from 2006 to 2099 (Prospective Run).\nIt includes downscaled projections from 33 models. Not every\nscenario contains projections from every model.\n\nNEX-DCP30 was prepared by the Climate Analytics Group and NASA Ames\nResearch Center using the NASA Earth Exchange, and distributed by the NASA\nCenter for Climate Simulation (NCCS).\n\n### Bands\n\n\n**Pixel Size**\n\n927.67 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|----------|-----------|----------|----------|------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `pr` | kg/m\\^2/s | 0\\* | 0.0016\\* | meters | Monthly mean of the daily precipitation rate at surface; includes both liquid and solid phases from all types of clouds (both large-scale and convective) |\n| `tasmin` | K | 235.91\\* | 308.97\\* | meters | Monthly mean of the daily-minimum near-surface air temperature |\n| `tasmax` | K | 246.4\\* | 325.53\\* | meters | Monthly mean of the daily-maximum near-surface air temperature |\n\n\\* estimated min or max value\n\n### Image Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|----------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| scenario | STRING | Name of the CMIP5 scenario. It is one of: 'historical', 'rcp26', 'rcp45', 'rcp60', 'rcp85', where 'historical' designates retrospective model runs (pre-2006). |\n| model | STRING | Name of the CMIP5 model. It is one of 'ACCESS1-0', 'bcc-csm1-1', 'bcc-csm1-1-m', 'BNU-ESM', 'CanESM2', 'CCSM4', 'CESM1-BGC', 'CESM1-CAM5', 'CMCC-CM', 'CNRM-CM5', 'CSIRO-Mk3-6-0', 'FGOALS-g2', 'FIO-ESM', 'GFDL-CM3', 'GFDL-ESM2G', 'GFDL-ESM2M', 'GISS-E2-H-CC', 'GISS-E2-R', 'GISS-E2-R-CC', 'HadGEM2-AO', 'HadGEM2-CC', 'HadGEM2-ES', 'inmcm4', 'IPSL-CM5A-LR', 'IPSL-CM5A-MR', 'IPSL-CM5B-LR', 'MIROC5', 'MIROC-ESM', 'MIROC-ESM-CHEM', 'MPI-ESM-LR', 'MPI-ESM-MR', 'MRI-CGCM3', 'NorESM1-M'. |\n| metric | DOUBLE | Calendar month |\n\n### Terms of Use\n\n**Terms of Use**\n\nThis dataset is in the public domain and is available\nwithout restriction on use and distribution. See [NASA's\nEarth Science Data \\& Information Policy](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-information-policy)\nfor additional information.\n\n### Citations\n\nCitations:\n\n- Thrasher, B., J. Xiong, W. Wang, F. Melton, A. Michaelis and R. Nemani\n (2013), Downscaled Climate Projections Suitable for Resource Management,\n Eos Trans. AGU, 94(37), 321.\n [doi:10.1002/2013EO370002](https://doi.org/10.1002/2013EO370002)\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.ImageCollection('NASA/NEX-DCP30')\n .filter(ee.Filter.date('2018-07-01', '2018-07-30'));\nvar minimumAirTemperature = dataset.select('tasmin');\nvar minimumAirTemperatureVis = {\n min: 265.0,\n max: 285.0,\n palette: ['blue', 'purple', 'cyan', 'green', 'yellow', 'red'],\n};\nMap.setCenter(-115.356, 38.686, 5);\nMap.addLayer(\n minimumAirTemperature, minimumAirTemperatureVis, 'Minimum Air Temperature');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_NEX-DCP30) \n[NEX-DCP30: NASA Earth Exchange Downscaled Climate Projections](/earth-engine/datasets/catalog/NASA_NEX-DCP30) \nThe NASA NEX-DCP30 dataset is comprised of downscaled climate scenarios for the conterminous United States that are derived from the General Circulation Model (GCM) runs conducted under the Coupled Model Intercomparison Project Phase 5 (CMIP5, see Taylor et al. 2012) and across the four greenhouse gas emissions scenarios known as ... \nNASA/NEX-DCP30, cag,climate,cmip5,geophysical,ipcc,nasa,nex,precipitation,temperature \n1950-01-01T00:00:00Z/2099-12-01T00:00:00Z \n24.07 -125.03 53.74 -66.47 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.nccs.nasa.gov/services/data-collections/land-based-products/nex-dcp30)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_NEX-DCP30)"]]
