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wdc-climate.de:3879249 eng; USA collection EKF400_v2.0 Dr. Jörg Franke University of Bern not filled pointOfContact Dr. Jörg Franke University of Bern not filled pointOfContact 2020-06-23T16:32:29 ISO 19115 ISO 19115-2:2009 Ensemble Kalman Fitting Paleo-Reanalysis Version 2 (EKF400_v2) 2020-07-28 publication 1 EKF400_v2.0 doi:10.26050/WDCC/EKF400_v2.0 Dr. Jörg Franke Institute of Geography and Oeschger Centre for Climate Change Research not filled Email: franke@giub.unibe.ch principalInvestigator Dr. Jörg Franke Institute of Geography and Oeschger Centre for Climate Change Research not filled Email: franke@giub.unibe.ch author Dr. Veronika Valler Institute of Geography and Oeschger Centre for Climate Change Research not filled Email: veronika.valler@giub.unibe.ch author Yuri Brugnara Institute of Geography and Oeschger Centre for Climate Change Research not filled Email: yuri.brugnara@gmail.com author Prof. Dr. Stefan Brönnimann Institute of Geography and Oeschger Centre for Climate Change Research not filled Email: stefan.broennimann@giub.unibe.ch author WDC Climate at DKRZ publisher 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temperature, surface pressure and precipitation (new in version 2) observations, temperature indices derived from historical documents and temperature and moisture sensitive tree-ring measurements (largely increased number in version 2) were assimilated into an atmospheric general circulation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. Dr. Jörg Franke University of Bern not filled pointOfContact NetCDF data assimilation tree ring proxy data CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ eng; USA -180.0 180.0 -90.0 90.0 360_day 1602-01-15 2003-12-15 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) air_pressure_at_sea_level 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 precipitation_amount "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 air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: K geopotential_height 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 lagrangian_tendency_of_air_pressure "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 pressure_level_wind not filled; unit: Pa time time [CF-Standard Name]; unit: not filled level_temp not filled; unit: m and Pa pressure_level_gph not filled; unit: Pa eastward_wind "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 latitude latitude [CF-Standard Name]; unit: degrees_north longitude longitude [CF-Standard Name]; unit: degrees_east northward_wind "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 NetCDF 110330 https://www.wdc-climate.de/ui/entry?acronym=EKF400_v2.0 information collection n/a None