Categories - Climate Change

Sub Categories

Topics

flood, cmip6, xclim, e3sm, integrated-assessment, esgf, inundation, hazard-assessment, integrated-assessment-model, climate-data-analysis, tropical-cyclone, cmip, cesm, chirps, hazard, gcam, zealand, national-climate-database, kml, climate-stations, neuralgcm, human-earth-system, climateserv, emodis, esmf, esi, coupled-human-natural-systems, climate-datasets, imerg, disaster, national-water-center, climate-indices, hurricane, icclim, agricultura, cf-conventions, meteorologia, climate-forecasting, s2s, floods, ncar, cmip5, climate-research, cdat, netcdf-library, basin-modeling, openquake, loss, insurance, catastrophe-modelling, catastrophe-model, world3, apache-beam, gfdl, fms, anuclim, gdpcir, climate-impacts, model-validation, forecast-evaluation, contingency-table, urban-climate-model, xcdat, pcmdi, climate-sciences, oceanic-nino, ndimensional-arrays, compressed, cyclone, regrid, netcdf-operators, nco, hdf, gsl, flood-monitoring, roms, regional, regcm, coupled, weather-information, ncei, netcdf-fortran, transcription, digitization, data-rescue, archives, xarray-accessor, ecmwf-services, cds, earthkit, sedimentation, sediment-transport, paleogeography, paleoclimate, lithology, landscape-evolution-model, erosion-process, compaction, cluster, parameters, ecco, tiros, radiometric, metop, lac, gac, avhrr, inasafe, disasterresponse, warming-stripes, sea-levels, carbon-dioxide-data, h5py, pca, cru, gpm-imerg, mtclim, ornl-daac, hector-model, hut23-1077, netcdf-files, multiple-threads, strategic-planning, demographics, colombia, matlab-toolbox, ropenspain, forecast-api, aemet, national-water-model, hand, psha, openquake-engine, prepare, cmor3, climate-policy, model-diagnostics, unstructured-grids, ugrid, ecosystem, clm, spaceweather, iris, timeseries-format, scenario-data, macro-energy, integrated-assessment-scenarios, iamc-format, vulnerability, reinsurance, eof-analysis, dimensionality-reduction, jedi, gefs, gdas, xgcm, cmip6-data, hector, magicc-model, kokkos, cxx, flood-inundation-maps, solar-radiation, relative-humidity, frost, elevation, diurnal-temperature, cru-cl2, ncdc, pp, cfunits, cfdm, cf, rating-curve, hec-ras, floodplain, dem, predictive-analytics, multimodel-ensemble, ohio-state-university, oceans, fever, byrd, mpi4py, projection, s2d, archiving, weather-conditions, tropical-cyclone-variability, potential-intensity, hurricanes, hurricane-calculations, unidata-netcdf, gridded-climate-data, aoi, smap, sea-ice-thickness, scicomm, tropical-storms, cyclones-behaviour, um, conflict, lisvap, lisflood, glofas, efas, sr15, pathway-analysis, storms, performance-diagram, mrms, hail, cloud-optimized, servirglobal, servir, ndvi, bom, australia-bureau-of-meteorology, ogc, indices, tsunami, surge, storm, adaptive, disaster-risk-management, near-real-time, warming-levels, ipcc-regions, climate4r, climate-change-atlas, flood-risk-models, pollen-measurements, phenology-data, ogd, mpas-analysis, mpas, landslide, debrisflow, rstats-package, gcam-china, china, nuopc, model-coupling, esmx, earth-system-modelling, earth-system-modeling-framework, norwegian, noresm, cansips, cangrd, historical-weather, gsod, global-data, daily-weather, daily-data, med-team, large-language-models, climate-services, climate-assessments, ai-for-climate, soil-plant-atmosphere, sif, fluorescence, satellite-imagery-analysis, landsat-data, geodata, ahccd, data-catalog, cesm-lens, tensorflow2, sckit-learn, ensemble-machine-learning, geoinformatics, logon, return-period, kostra, intensity-duration-frequency, heavy-rain, dwa-a-531, dwa, duration-steps, duration, design-rainfall, hadcrut5, climate-simulations, climate-indicators, calculation-climate, variance-scaling, quantile-mapping, quantile-delta-mapping, linear-scaling, detrended-quantile-mapping, delta-method, delta-change-method, cdf, bias-adjustment, tropical, cyclones, adcirc,

Projects

Contributors

Trude Eidhammer trude@yslogin3.(none)

OST Projects: 1
Categories: Climate Change, Sustainable Development
Sub Categories: Climate Downscaling, Education
Topics: climate, downscaling, icar, precipitation, regional-climate-model

Valerio Lembo [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics:

Tatyana Bulavskaya [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Integrated Assessment and Climate Policy
Topics:

fredericreynes [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Integrated Assessment and Climate Policy
Topics:

made [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Integrated Assessment and Climate Policy
Topics:

Jessica Strefler [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Integrated Assessment and Climate Policy
Topics:

William James Pringle [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

nadia-eecs [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Kike Portales [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Nadia Ahmed [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Samuel Budd [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Satyarth Praveen [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Zhou Xudong [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics:

Tony De Crescenzo [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics: canada, disaster, flood, flood-risk-models, qgis

James Gibson [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics: canada, disaster, flood, flood-risk-models, qgis

adm_891 [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics: canada, disaster, flood, flood-risk-models, qgis

Govind Lahoti [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Natural Hazard and Storm
Topics: climate-change, transit-data

root [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Access and Visualization
Topics: esgf, logon, opendap

CEDA [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Access and Visualization
Topics: esgf, logon, opendap

Robert [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Stuart Lynn [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Tim [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Robert Smith [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Robert Smith [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription, consumption, energy-consumers, energy-producers and 6 more

Robert Smith [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Alexandre Leroux [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: ahccd, cangrd, cansips, climate, cmip5, downscale, community, ecology, networks, presentation and 3 more

Yumeng [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

jinxingster [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Ben W. Brumfield [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

dhogg [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription

Ben Laurie [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: archives, citizen-science, climate, community, data-rescue, digitization, transcription, arrange, boolean-operations, cgal and 19 more

Mathieu Provencher [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: climate, indices, ogc, wps, xclim, climate-science, online-service, spatial-data-analysis, jenkins-ci, climate-services and 8 more

Long Vu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Climate Data Processing and Analysis
Topics: climate, indices, ogc, wps, xclim, jenkins-ci

Samuel Levis [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Stefan Muszala [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Danica Lombardozzi [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Keith Oleson [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

wwieder [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar, diagnostics

mvdebolskiy [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

chen693 [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

sunnivin [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Daniel Kennedy [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Mathew Rothstein [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

ivanderkelen [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar, publication, lakes and 1 more

Ronny Meier [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Rosemary Fisher [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Keith Oleson [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Leo van Kampenhout [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Sam Rabin [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Yaqiong Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Tony Craig [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

David Lawrence [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Danica [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Leo van Kampenhout [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Rosemary Fisher [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Katie Dagon [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Lifen Jiang [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Lifen Jiang [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Peter Lawrence [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Ryan Knox [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

thornton [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Ryan Knox [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Peter Lawrence [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Peter Lawrence [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Inne Vanderkelen [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

forrest [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Danny M. Leung [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

kaveh [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar, fates, modelling-tool and 1 more

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Samuel Levis [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Erik Kluzek [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

manoj.kc [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Danica Lombardozzi [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Danica Lombardozzi [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Erik Kluzek [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Gregory Lemieux [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Inne Vanderkelen [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Ivanderkelen [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Justin Perket [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Keith Oleson [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Lifen Jiang [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

glemieux [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Zhenggang Du [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Yaqiong Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Brian Kauffman [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Justin Perket [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

AdrienDams [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Xingjie Lu [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

William Wieder [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar

Sean Swenson [email protected]

OST Projects: 1
Categories: Climate Change
Sub Categories: Earth and Climate Modeling
Topics: cesm, climate, clm, ecosystem, hydrology, land, land-surface-model, ncar