My GeoNetwork catalogue
Ensemble Kalman Fitting Paleo-Reanalysis Version 2 (EKF400_v2)
EKF400 version 2 is a monthly resolved paleo-reanalysis covering the period 1603 to 2003. Early instrumental temperature, surface pressure and precipitation (new in version 2) observations, temperature indices derived from historical documents and temperature and moisture sensitive tree-ring measurements (largely increased number in version 2) were assimilated into an atmospheric general circulation model ensemble using a Kalman filtering technique. This data set combines the advantage of traditional reconstruction methods of being as close as possible to observations with the advantage of climate models of being physically consistent and having 3-dimensional information about the global state of the atmosphere at 2x2 degree resolution for various variables and at all points in time.
While version 1 was using time-dependent covariances from the 30-member ensemble, version 2 uses a blended covariance matrix. It consists of 50% time-dependent and 50% climatological covariances. This leads to a better covariance estimation, not only between various locations in space but in between various variables, too.
Simple
- Date (Publication)
- 2020-07-28
- Edition
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1
- Citation identifier
- EKF400_v2.0
- Citation identifier
- doi:10.26050/WDCC/EKF400_v2.0
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- Name
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NetCDF
- Keywords
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data assimilation
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- Keywords
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tree ring proxy data
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- Use limitation
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CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/
- Language
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eng; USA
))
- Begin date
- 1602-01-15
- End date
- 2003-12-15
- Supplemental Information
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info:eu-repo/grantAgreement/EC/FP7/607029/BE//European Reanalysis of the Global Climate System (ERA-CLIM2)
info:eu-repo/grantAgreement/SNSF//162668/CH//Reconstructing Climate Using Ensemble Kalman Fitting (REUSE)
- Distribution format
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NetCDF
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NetCDF
()
- Transfer size
- 110330
- OnLine resource
- https://www.wdc-climate.de/ui/entry?acronym=EKF400_v2.0
- Hierarchy level
- collection
Non quantitative attribute accuracy
- Name of measure
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n/a
- Measure description
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None
- Attribute description
- air_pressure_at_sea_level
- Descriptor
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sea_level means mean sea level, which is close to the geoid in sea areas. Air pressure at sea level is the quantity often abbreviated as MSLP or PMSL.[CF-Standard Name]; unit: Pa
- Attribute description
- precipitation_amount
- Descriptor
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"Amount" means mass per unit area. "Precipitation" in the earths atmosphere means precipitation of water in all phases. [CF-Standard Name]; unit: kg m-2
- Attribute description
- air_temperature
- Descriptor
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Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: K
- Attribute description
- geopotential_height
- Descriptor
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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]; unit: m
- Attribute description
- lagrangian_tendency_of_air_pressure
- Descriptor
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"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]; unit: Pa s-1
- Attribute description
- pressure_level_wind
- Descriptor
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not filled; unit: Pa
- Attribute description
- time
- Descriptor
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time [CF-Standard Name]; unit: not filled
- Attribute description
- level_temp
- Descriptor
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not filled; unit: m and Pa
- Attribute description
- pressure_level_gph
- Descriptor
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not filled; unit: Pa
- Attribute description
- eastward_wind
- Descriptor
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"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]; unit: m s-1
- Attribute description
- latitude
- Descriptor
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latitude [CF-Standard Name]; unit: degrees_north
- Attribute description
- longitude
- Descriptor
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longitude [CF-Standard Name]; unit: degrees_east
- Attribute description
- northward_wind
- Descriptor
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"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]; unit: m s-1
- File identifier
- wdc-climate.de:3879249 XML
- Metadata language
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eng; USA
- Hierarchy level
- collection
- Hierarchy level name
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EKF400_v2.0
- Date stamp
- 2020-06-23T16:32:29
- Metadata standard name
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ISO 19115
- Metadata standard version
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ISO 19115-2:2009
Overviews
Spatial extent
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