ModE-Sim - A medium size AGCM ensemble to study climate variability during the modern era (1420 to 2009): Set 1420-2

ModE-Sim (short for Modern Era Simulations) is a medium-size ensemble of model simulations using the ECHAM6 atmosphere general circulation model (model version 6.3.5p2, doi:10.17617/2.1810480). Its setup is based on the PMIP4 experiments, but uses a forced AGCM rather than a fully coupled model.


ModE-Sim was originally designed to form the a-priori state for a climate reconstruction (Modern Era Reanalysis, ModE-RA, to be found as separate experiment within this WDC project) that uses an offline data assimilation technique to combine the output of ModE-Sim with historical climate information. However, beyond its original purpose ModE-Sim on its own can be used as a tool to study climate variability, providing a high number of posible climate states that are physically plausible under the given forcings and boundary conditions. This might include, e.g. the separation of internal variability from the response to externally forced signals, understanding of teleconnection patterns, or the study of extreme events.


The ensemble uses observed/reconstructed forcings and boundary conditions, while accounting in uncertainties in these. For 1420 to 1850 we provide a 60 member ensemble grouped in three subsets. The subset 1420-2 provided in this dataset group has 20 members and uses a 20-member ensemble of perturbed volcanic forcings from the easy volcanic aerosol (EVA) model to account for uncertainties in the strength and the timing of volcanic eruptions. As ocean boundary condition 20 different realizations of SST reconstructions were used and for sea ice analogues were picked from the HadISST2 sea ice, based on the reconstructed SST fields.

Simple

Date (Publication)
2023-04-12
Edition

1
Citation identifier
ModE-Sim_s14202
Citation identifier
doi:10.26050/WDCC/ModE-Sim_s14202
Principal investigator
  University of Bern - Dr. Ralf Hand
not filled
Author
  University of Bern - Dr. Ralf Hand
not filled
Author
  University of Bern - Prof. Dr. Stefan Brönnimann
not filled
Author
  University of Bern - Dr. Eric Samakinwa
not filled
Author
  University of Bern - Laura Lipfert
not filled
Publisher
  WDC Climate at DKRZ
Point of contact
  University of Bern - Dr. Ralf Hand
not filled
Point of contact
  University of Bern - Prof. Dr. Stefan Brönnimann
not filled
Name

NetCDF
Keywords

  • ECHAM6
Keywords

  • ECHAM6-3-LR
Keywords

  • ECHAM6.3
Keywords

  • atmospheric model
Keywords

  • climate simulation
Keywords

  • ensemble runs
Keywords

  • forcing dataset
Keywords

  • historical run
Keywords

  • large ensemble
Keywords

  • model data
Keywords

  • model-output
Keywords

  • volcanic forcing
Use limitation

CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/

Language

eng; USA
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Begin date
1420-01-01
End date
1849-12-31
Supplemental Information

info:eu-repo/grantAgreement/EC/H2020/787574/BE//PA Palaeoreanalysis To Understand Decadal Climate Variability (PALAEO-RA)
Distribution format
  • NetCDF ()

Transfer size
245036
OnLine resource
https://www.wdc-climate.de/ui/entry?acronym=ModE-Sim_s14202
Hierarchy level
collection
Attribute description
lagrangian_tendency_of_air_pressure-at500hPa
Descriptor

"tendency_of_X" means derivative of X with respect to time. The Lagrangian tendency of a quantity is its rate of change following the motion of the fluid, also called the "material derivative" or "convective derivative". The Lagrangian tendency of air pressure, often called "omega", plays the role of the upward component of air velocity when air pressure is being used as the vertical coordinate. If the vertical air velocity is upwards, it is negative when expressed as a tendency of air pressure; downwards is positive.[CF-Standard Name-vertical_coordinate]; unit: Pa s-1
Attribute description
air_temperature-at2m
Descriptor

Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name-vertical_coordinate]; unit: K
Attribute description
precipitation_flux
Descriptor

In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. [CF-Standard Name]; unit: kg m-2 s-1
Attribute description
single_scattering_albedo
Descriptor

not filled; unit: 1
Attribute description
northward_wind-at850hPa
Descriptor

"Northward" indicates a vector component which is positive when directed northward (negative southward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) [CF-Standard Name-vertical_coordinate]; unit: m s-1
Attribute description
geopotential_height-at500hPa
Descriptor

Geopotential is the sum of the specific gravitational potential energy relative to the geoid and the specific centripetal potential energy. Geopotential height is the geopotential divided by the standard acceleration due to gravity. It is numerically similar to the altitude (or geometric height) and not to the quantity with standard name height, which is relative to the surface. [CF-Standard Name-vertical_coordinate]; unit: m
Attribute description
aerosol effective radius
Descriptor

aerosol effective radius; unit: m-6
Attribute description
aerosol_extinction
Descriptor

not filled; unit: m-1
Attribute description
eastward_wind-at850hPa
Descriptor

"Eastward" indicates a vector component which is positive when directed eastward (negative westward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) [CF-Standard Name-vertical_coordinate]; unit: m s-1
Attribute description
aerosol_scattering_asymmetry_factor
Descriptor

not filled; unit: 1
Attribute description
sea_surface_temperature
Descriptor

Sea surface temperature is usually abbreviated as "SST". It is the temperature of sea water near the surface (including the part under sea-ice, if any), and not the skin temperature, whose standard name is surface_temperature. For the temperature of sea water at a particular depth or layer, a data variable of sea_water_temperature with a vertical coordinate axis should be used. [CF-Standard Name]; unit: K
Attribute description
aerosol optical depth
Descriptor

aerosol optical depth; unit: 1
Attribute description
sea_ice_area_fraction
Descriptor

sea_ice_area_fraction [CF-Standard Name]; unit: %
Attribute description
air_pressure_at_mean_sea_level
Descriptor

Air pressure at sea level is the quantity often abbreviated as MSLP or PMSL. Air pressure is the force per unit area which would be exerted when the moving gas molecules of which the air is composed strike a theoretical surface of any orientation. "Mean sea level" means the time mean of sea surface elevation at a given location over an arbitrary period sufficient to eliminate the tidal signals. [CF-Standard Name]; unit: Pa
File identifier
wdc-climate.de:3970251 XML
Metadata language

eng; USA
Hierarchy level
collection
Hierarchy level name

ModE-Sim_s14202
Date stamp
2023-03-02T14:54:29
Metadata standard name

ISO 19115
Metadata standard version

ISO 19115-2:2009
Point of contact
  University of Bern - Dr. Ralf Hand
not filled
Point of contact
  University of Bern - Prof. Dr. Stefan Brönnimann
not filled
 
 

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