Identification

Title

Past2k: Transient simulation of the climate of the last 2000 years

Alternative title(s)

d651023

Abstract

<p>This past2k simulation spanning the last 2 millennia, described in the <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL079447">reference paper</a>, uses the fully coupled CESM1.1 at 1 degree resolution in the ocean and sea ice model model and 2 degree resolution in the atmosphere and land model, the same configuration used for the <a href="https://doi.org/10.1175/BAMS-D-14-00233.1"> CESM Last Millennium Ensemble</a>. </p> <p>The past2k simulation was forced using data compiled for <a href="https://gmd.copernicus.org/articles/10/4005/2017/">PMIP4</a>. As there was no land-cover forcing available prior to 850 CE when the past2k simulation was started, a superposition of HYDE3.1 crop land changes onto the LME land cover for 850 CE was applied between 1 CE to 849 CE, followed by the land cover forcing from the Last Millennium Ensemble between 850 and 20005 CE. A volcanic aerosol forcing file for CESM1 for the last 2000 years was generated using <a href="https://gmd.copernicus.org/articles/9/4049/2016/">PMIP4 Easy Volcanic Aerosol data</a>. The land cover and volcanic forcing data used for past2k is <a href="https://openpolar.no/Record/ftzenodo:oai:zenodo.org:1304427">published</a>.</p> <p>Monthly and daily outputs spanning the last 2000 years are saved and archived as single variable timeseries for the atmosphere, ocean, sea ice, and land model. (Note: In the daily ice data, the file trans1-850AD.cice.h1.FYarea_d.18000101-18991231.nc was corrupted and is not available.) Restart files from the transient simulation are available every 10 years for the first 1000 years and every five years for the second 1000 years of past2k.</p> <p>In addition to the transient past2k output, restart files from the 520 year long CE control simulation are available every 10 years. Note that the past2k simulation was started from year 203 of this control run. See the <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL079447">reference paper</a> for more details on the model spin-up.</p> <p>The past2k simulation was enabled by a Grant of Excellence (141573-053) from the Icelandic Research Center (RANNIS) and the National Science Foundation (ARC 1204096). The model simulation was conducted with high performance computing support from Yellowstone provided by NCAR's Computational and Information Systems Laboratory, sponsored by the National Science Foundation. </p>

Resource type

dataset

Resource locator

https://gdex.ucar.edu/datasets/d651023/

protocol: https

name: Dataset Description

description: Related Link

function: information

https://gdex.ucar.edu/datasets/d651023/dataaccess/

protocol: https

name: Data Access

description: Related Link

function: download

Unique resource identifier

code

codeSpace

Dataset language

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

climatologyMeteorologyAtmosphere

Keywords

Keyword set

keyword value

dataset

originating controlled vocabulary

title

reference date

date type

revision

effective date

2021-03-30

Keyword set

keyword value

CESM > NCAR Community Earth System Model

originating controlled vocabulary

title

reference date

date type

revision

effective date

2025-10-03

Keyword set

keyword value

EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > LIQUID PRECIPITATION > RAIN

originating controlled vocabulary

title

reference date

date type

revision

effective date

2025-10-03

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

0001-01

End position

2005-12

Dataset reference date

date type

publication

effective date

2021-01-13

Frequency of update

notPlanned

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Creative Commons Attribution 4.0 International License

Limitations on public access

None

Responsible organisations

Responsible party

organisation name

email address

datahelp@ucar.edu

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

NSF NCAR Geoscience Data Exchange

email address

datahelp@ucar.edu

web address

https://gdex.ucar.edu

name: NSF NCAR Geoscience Data Exchange

description: The Geoscience Data Exchange (GDEX), managed by the Computational and Information Systems Laboratory (CISL) at NSF NCAR, contains a large collection of meteorological, atmospheric composition, and oceanographic observations, and operational and reanalysis model outputs, integrated with NSF NCAR High Performance Compute services to support atmospheric and geosciences research.

function: download

responsible party role

pointOfContact

Metadata date

2025-10-09T01:35:56Z

Metadata language