[Parameters: Topic='ATMOSPHERE', Term='ATMOSPHERIC WINDS', Variable_Level_1='WIND STRESS']
ERA40 T85 Monthly Mean Surface Analysis and Surface Forecast Fields, created at NCAREntry ID: NCAR_DS126.0
Abstract: DS126.0 represents a dataset implemented and computed by NCAR's Data Support Section, and forms an essential part of efforts undertaken in late 2004, early 2005, to produce an archive of selected segments of ERA-40 on a standard transformation grid. In this case, forty seven ERA-40 monthly mean (designated as "MODA" or "moda" below) ... surface and single level analysis variables were transformed from a reduced N80 Gaussian grid to a 256x128 regular Gaussian grid. (These are further designated as "SURFACE", or "SURFACE/SINGLE LEVEL", or "SFC/sfc", variables below.) All fields were transformed using routines from the ECMWF EMOS library, including 10 meter winds which were treated as scalars because of a lack of 10 meter spectral vorticity and divergence. A missing value of 9.999e+20 occurs in the sea surface temperature and sea ice (SSTK and CI) fields to mask grid points occurring over land. Fields formerly archived as whole integers, such as vegetation indices and cloud cover, occur as integers plus a fractional part in the T85 version due to interpolation. Twenty seven ERA-40 monthly mean (designated as "MODA" or "moda" below) surface and single level 6-hour forecast variables were transformed from a reduced N80 Gaussian grid to a 256x128 regular Gaussian grid. (These are further designated as "OTHER", or "othr", variables below.) Four of the variables are "instantaneous" variables, and the remaining twenty three variables are "accumulated" over the 6-hour forecast time. Divide the accumulated variables by 21600 seconds to obtain instantaneous values. (Multiplication by minus one may also be necessary to match the sign convention one is accustomed to.) All fields were transformed using routines from the ECMWF EMOS library, including three pairs of stresses which were treated as scalars because of a lack of spectral precursors. In addition, all corresponding 00Z, 06Z, 12Z, and 18Z monthly mean surface and single level analysis variables and 6-hour forecast variables were also transformed to a T85 Gaussian grid (designated as "MNLY", "mnly", or "mnth" below) All forecast variables are valid 6 hours after the forecast was initiated. Thus, 00Z 6-hour forecast evaporation is valid at 06Z. Divide the accumulated variables by 21600 seconds to obtain instantaneous values. (Multiplication by minus one may also be necessary to match the sign convention one is to.) The choice of a T85 Gaussian grid was based on considerations of limiting the volume of new data generated to a moderate level, and to match the horizontal resolution of the Community Atmosphere Model (CAM) [http://www.ccsm.ucar.edu/models/atm-cam/] component of NCAR's Community Climate System Model (CCSM). The ERA-Interim data from ECMWF is an update to the ERA-40 project. The ERA-Interim data starts in 1989 and has a higher horizontal resolution (T255, N128 nominally 0.703125 degrees) than the ERA-40 data (T159, N80 nominally 1.125 degrees). ERA-Interim is based on a more current model than ERA-40 and uses 4-D VAR (as apposed to 3-D VAR in ERA-40). ECMWF will continue to run the ERA-Interim model in near real time thru at least 2010, and possibly longer. This data is available in ds627.0 [http://dss.ucar.edu/datasets/ds627.0].
Data Set Citation
Dataset Originator/Creator: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
Dataset Title: ERA40 T85 Monthly Mean Surface Analysis and Surface Forecast Fields, created at NCAR
Dataset Publisher: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric ResearchOnline Resource: http://dss.ucar.edu/datasets/ds126.0/
Start Date: 1957-09-01Stop Date: 2002-08-31
Latitude Resolution: 1.375 degrees
Longitude Resolution: 1.4 degrees
Horizontal Resolution Range: 100 km - < 250 km or approximately 1 degree - < 2.5 degrees
ATMOSPHERE > AIR QUALITY > TROPOSPHERIC OZONE
ATMOSPHERE > ALTITUDE > PLANETARY BOUNDARY LAYER HEIGHT
ATMOSPHERE > ATMOSPHERIC PRESSURE > GRAVITY WAVE
ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE
ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE AIR TEMPERATURE
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > DEW POINT TEMPERATURE
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > EVAPORATION
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > PRECIPITABLE WATER
ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR
ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS
ATMOSPHERE > ATMOSPHERIC WINDS > WIND STRESS
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY
ATMOSPHERE > PRECIPITATION > PRECIPITATION AMOUNT
ATMOSPHERE > PRECIPITATION > SNOW
ATMOSPHERE > ATMOSPHERIC RADIATION > HEAT FLUX
ATMOSPHERE > ATMOSPHERIC RADIATION > INCOMING SOLAR RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > LONGWAVE RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > OUTGOING LONGWAVE RADIATION
ATMOSPHERE > ATMOSPHERIC RADIATION > SHORTWAVE RADIATION
BIOSPHERE > VEGETATION > VEGETATION COVER
BIOSPHERE > VEGETATION > VEGETATION SPECIES
CRYOSPHERE > SNOW/ICE > SNOW/ICE TEMPERATURE
TERRESTRIAL HYDROSPHERE > SNOW/ICE > ALBEDO
TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW DENSITY
TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW DEPTH
TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW MELT
TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW/ICE TEMPERATURE
TERRESTRIAL HYDROSPHERE > SURFACE WATER > RUNOFF
LAND SURFACE > LAND TEMPERATURE > SKIN TEMPERATURE
LAND SURFACE > SOILS > SOIL MOISTURE/WATER CONTENT
LAND SURFACE > SOILS > SOIL TEMPERATURE
LAND SURFACE > SURFACE RADIATIVE PROPERTIES > ALBEDO
LAND SURFACE > TOPOGRAPHY > SURFACE ROUGHNESS
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
OCEANS > SEA ICE > ICE EXTENT
ISO Topic Category
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Hanna, E., T.Jónsson, J.E.Box (2004), An analysis of Icelandic climate since the nineteenth century., 24, 1193-2004, International J. of Climatology
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Creation and Review Dates
DIF Creation Date: 2012-01-04
Last DIF Revision Date: 2013-01-22