b.e21.B1850.f09_g17.CMIP6-piControl.001 data

CAM6 pre-industrial control

b.e21.BW1850.f09_g17.CMIP6-piControl.001 data

WACCM pre-industrial control run, years 0300-0349

b.e21.BHIST.f09_g17.CMIP6-historical.003 data

CAM6 historical run, years 1850-2014

b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.001 data

WACCM historical, years 1850-2014

f.e21.FHIST_BGC.f09_f09_mg17.CMIP6-AMIP.001 data

CAM6 AMIP 001, years 1950-2014

f.e21.FWHISTBgcCrop.f09_f09_mg17.CMIP6-AMIP-WACCM.001 data

WACCM AMIP 001, years 1950-2014

Gettelman ECS data

The Community Earth System Model Version 2 (CESM2) has a Equilibrium Climate Sensitivity (ECS) of 5.3K. ECS is an emergent property of both climate feedbacks and aerosol forcing. The increase in ECS over the previous version (CESM1) is the result of cloud feedbacks. Interim versions of CESM2 had a land model which damped ECS. Part of the ECS change results from evolving the model configuration to reproduce the long term trend of global and regional surface temperature over the 20th century in re...

Preindustrial fully coupled CESM2.0.1 (B1850_c201_CTL) for atmospheric river analyses

CESM version 2.0.1 (the original public-release version of CESM2, and scientifically identical to public version 2.1.0) was run on a nominal 1-degree finite-volume horizontal grid for 30 years to assess the model's ability to represent atmospheric rivers (extreme precipitation events) and their related weather patterns. The dataset is comprised of global, daily averaged CAM history files for selected single-level and multi-level fields. Data size was minimized by extracting from the native files...

International Space Science Institute Observing System Simulation Experiment

This dataset is comprised of WRF output, created to study orographically generated gravity waves observed by satellite-borne radiometers in the stratosphere. The intent is for the OGWs in the output to be used to evaluate satellite-methods for computing vertical fluxes of horizontal momentum, to be compared with waves in ECMWF and UKMO UM models, and to be validated against stratospheric satellite observations. This dataset covers the Patagonia and Antarctic Peninsula regions. The overall object...

CESM2.1 CISM2 JG/BG simulations

CAM6 Prescribed SST AMIP Ensembles

Experiments using prescribed SST and ice forcing within CAM6 using the CESM2.

CISM ISMIP6 Antarctic Projection data

This work aims at quantifying uncertainties in sea level projections using forcing from the Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6). The Community Ice Sheet Model (CISM) is used to run ISMIP6-based projections of ocean-forced Antarctic Ice Sheet (AIS) evolution. In these experiments we investigate parameters such as basal friction laws, grid resolutions, melt scheme, stress balance approximation among others. These runs span 550 years starting from a spin-up starting at year 1...

CESM2 S2S Hindcasts

This dataset contains subseasonal-to-seasonal (S2S) hindcasts with CESM2 that were carried out as a community project and with community analysis in mind. These forecasts consist of 45-day long runs initialized every Monday from 1999 to 2019, 11 ensemble members. Output includes atmospheric, land, ocean and sea-ice variables (many requested by the community). These simulations are in support of the work done by the newly formed Earth System Predictability Working Group within CESM.

CESM2-WACCM S2S Hindcasts

This dataset contains subseasonal-to-seasonal (S2S) hindcasts with CESM2-WACCM that were done in support of a NOAA project and also NCAR NSC project on Whole Atmosphere subseasonal predictability. These forecasts consist of 45-day long runs initialized every Monday from 1999 to 2019, 11 ensemble members for start dates between Septemeber and March (winter season). Output includes atmospheric, land, ocean and sea-ice variables. The project utilized both NOAA gran and core funding. NOAA did not re...

CESM2-CISM2 Transient Last Interglacial Simulations

The Transient Last Interglacial dataset contains output from the TransientLIG simulation from 127,000 to 119,000 years before present (127 – 119 ka). This simulation is with the CESM2.1 at the FV1_gx1v6 resolution coupled to CISM2 at 4 km resolution for Greenland. The ice sheet model and the orbital parameters over time (eccentricity, obliquity, and precession) are accelerated - advancing 5 years for each CESM2 year. In CAM6, the surface elevation over Greenland is updated every 10 atmosphere ye...

CESM2-WACCM6-SSP245

This is a 10-member ensemble of SSP2-4.5 simulations with CESM2 (WACCM6) that provide control simulations for the ARISE-SAI (Assessing Responses and Impacts of Solar climate intervention on the Earth system with Stratospheric Aerosol Injection) simulations. The first 5 members have the default CMIP6 output whereas the subsequent 5 ensemble members include additional output that matches the ARISE-SAI output. Simulations go from 2015 to 2100 (for the first 5 ensemble members) and from 2015 through...

CESM2.2-CAM6 Perturbed Parameter Ensemble (PPE)

To evaluate parameterizations in models, simulations have often been performed with only one change to one parameterization at a time. This is highly inefficient and can be both time-consuming and computationally costly. This data represents ensembles using a Perturbed Parameter Ensemble (PPE) technique, where multiple parameters are varied simultaneously and the parameter values are determined with Latin Hypercube sampling. The simulations vary 43 parameters in the microphysics, convective, tur...

CESM2-CMIP5 Forcing

The CESM2 with CMIP5 forcing is a set of climate model simulations intended to disentangle the role of forcing versus model structure between CESM2 and CESM1 for pre-industrial, 20th and 21st centuries simulations. The CESM2 has considerable changes relative to the CESM1 both in the model structure and in the forcing. In order to understand these changes and their impact on climate variability and change, simulations with CESM2 but with a forcing similar to CESM1 were performed. Data Descr...

CESM2 and CESM1 data supporting Long et al. (2021): Simulations with the Marine Biogeochemistry Library

The Marine Biogeochemistry Library (MARBL) is a prognostic ocean biogeochemistry model that simulates marine ecosystem dynamics and the coupled cycles of carbon, nitrogen, phosphorus, iron, silicon, and oxygen. MARBL is a component of the Community Earth System Model (CESM); it supports flexible ecosystem configuration of multiple phytoplankton and zooplankton functional types; it is also portable, designed to interface with multiple ocean circulation models. Here, we present scientific documen...

CESM2 Pacific Pacemaker Ensemble

A 10-member ensemble of CESM2 (1 degree spatial resolution) simulations in which time-evolving SST anomalies in the eastern tropical Pacific are nudged to observations (NOAA Extended Reconstruction Sea Surface Temperature version 5: ERSSTv5) during 1880-2019. In this way, the observed evolution of ENSO is maintained in each simulation (i.e., ENSO is the pacemaker), with the rest of the model’s coupled climate system free to evolve. Note that only the SST anomalies, not the total SST, are nudged ...

CESM2 Forced Ocean Sea-Ice (FOSI) Experiment

This high-resolution Forced-Ocean-Sea-Ice (FOSI) experiment uses version 2 of the Community Earth System Model (CESM). The ocean component is the Parallel Ocean Program version 2 (POP2) run at nominal 0.1° horizontal resolution with 62 vertical levels. The sea ice model is the Community Ice Code version 5 (CICE5) and is run on the same horizontal grid as the ocean. FOSI is forced at the surface with historical atmospheric state and flux fields from the JRA55-do dataset. JRA55-do cover the 1958–2...

ARISE-SAI-1.5

The Assessing Responses and Impacts of Solar climate intervention on the Earth system with stratospheric aerosol injection simulations (ARISE-SAI-1.5) utilize a moderate emission scenario, introduce stratospheric aerosol injection at ~ 21 km in year 2035, and keep global mean surface air temperature near 1.5C above the pre-industrial value. CESM2(WACCM6) global output from all model components (atm, ice, and, ocn) on monthly, daily and sub-daily frequencies. All data is on the original CESM2(...

CESM2 SMYLE

SMYLE (Seasonal-to-MultiYear Large Ensemble) is an initialized prediction system using CESM2. It consists of fully coupled initialized hindcast simulations using CESM2 component models at nominal 1° horizontal resolution. Hindcasts are initialized from historical reconstructions (SMYLE-FOSI for ocean and sea-ice; SMYLE-landonly for land; and JRA55 reanalysis for atmosphere) and then integrated forward 24-months. Initialization occurs quarterly (1st of each month of February, May, August, and Nov...

CESM2 Tuned Sea Ice Albedo Experiments

This study isolates the influence of sea ice mean state on pre-industrial climate and transient 1850–2100 climate change within a fully coupled global model: The Community Earth System Model version 2 (CESM2). The CESM2 sea ice model physics is modified to increase surface albedo, reduce surface sea ice melt, and increase Arctic sea ice thickness and late summer cover. Importantly, increased Arctic sea ice in the modified model reduces a present-day late-summer ice cover bias. Of interest to cou...

CESM2 SSP2-4.5 with Modified Biomass Burning Emissions

This is a 16 member ensemble of simulations with CESM2 under the SSP2-4.5 forcing scenario from 2015 to 2100. These simulations can be compared with the CESM2 Large Ensemble and provide the opportunity to compare and contrast climate change under a lower forcing scenario. One difference from the official CMIP6 SSP2-4.5 forcing is that slightly modified biomass burning emissions are used at the beginning of the simulation. As is discussed in the CESM2 Large Ensemble reference paper (Rodgers et. a...

CESM2 Mechanically Decoupled

The CESM2 Mechanically Decoupled Model (MDM) is designed to simulate buoyancy coupled climate variability. The MDM consists of the same model components, including the dynamic ocean model POP2, as the CESM2 fully coupled model (FCM), but lacks anomalous wind stress driven ocean dynamics. Ocean variability in the MDM is therefore primarily buoyancy driven. Different from a slab ocean model (SOM) with a time invariant mixed layer depth, the MDM includes a freely evolving seasonally varying mixed l...

CESM2 Single Forcing Large Ensemble Project

The CESM2 “Single Forcing” Large Ensemble Project is a publicly available set of climate model simulations useful for addressing the roles of individual forcings in historical and future climate change. This simulations use the same model and forcings as the CESM2 Large Ensemble Project and, therefore, can be used to parse the relative roles of different forcings in responses found in that ensemble where all forcings are applied together. The ensemble members are initialized from 1850 from the s...

CESM2.2 CAM-chem as Boundary Conditions

We have saved CAM-chem simulation output that is intended to be used as boundary conditions for regional modeling. We used CAM-chem at 0.9x1.25 horizontal resolution simulation with 32 vertical levels. Temperatures, and winds are nudged to MERRA2 reanalysis fields with by nudging with 12h relaxation (10%) to MERRA2 reanalysis. Data is saved as instantaneous fields every 6 hours. See a list of saved species. Chemistry is the MOZART-T1 mechanism, described in Emmons et al. (2019). You can find a d...

CESM/WACCM Runs Under Different Solar Conditions

Fundamental understanding of the climate responses to solar variability is obscured by the large and complex climate variability. This long-standing issue is addressed here by examining climate responses under an extreme quiet sun (EQS) scenario, obtained by making the sun void of all magnetic fields. It is used to drive a coupled climate model with whole atmosphere and ocean components. The simulations reveal significant responses, and elucidate aspects of the responses to changes of tropospher...

Storms role for air-sea CO2 exchange in the Southern Ocean

This dataset contains the forced ocean-ice simulation of CESM that is necessary to reproduce the ocean model analysis in Carranza et al. (2023) “Storms role for air-sea CO2 exchange in the Southern Ocean”, submitted to npj Climate and Atmospheric Sciences. It is a branch simulation of the ocean hindcast run used to initialize the Decadal Prediction Large Ensemble (DPLE, Yeager et al. 2018) for the years 2009-2014 using the CORE-Inter-Annually varying Forcing (CORE-IAF, Large & Yeager, 2008). For...

CESM2 SSP5-8.5 with Modified Biomass Burning Emissions

This is a 15 member ensemble of simulations with CESM2 under the SSP5-8.5 forcing scenario from 2015 to 2100. These simulations can be compared with the CESM2 Large Ensemble and provide the opportunity to compare and contrast climate change under a lower forcing scenario. One difference from the official CMIP6 SSP5-8.5 forcing is that slightly modified biomass burning emissions are used at the beginning of the simulation. As is discussed in the CESM2 Large Ensemble reference paper (Rogers et. al...

CESM2-WACCM6ma Last Millennium

The CESM Paleoclimate Working Group (PWG) and Whole Atmosphere Working Group (WAWG) conducted a Last Millennium (LM) community experiment with the high-top WACCM6ma version of CESM2.1. A corresponding 850CE Control simulation was also run. ). The LM simulation extends from years 850 through 1849CE forced by reconstructions for the transient evolution of solar intensity, volcanic emissions, greenhouse gases, aerosols, land use conditions, and orbital parameters. The control simulation has forcing...