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ERA40 T106 6-hourly Surface Analysis and Surface Forecast Fields, created at NCAR Entry ID: NCAR_DS127.0 |
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Summary
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Abstract:
DS127.0 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 standard transformation grids. In this case, forty six ERA-40 6-hourly surface and single level analysis variables were transformed from a reduced N80 Gaussian grid to a 320x160 regular Gaussian grid. (These are 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 T106 version due to interpolation. In addition, twenty seven ERA-40 6-hourly surface and single level 6-hour forecast variables were transformed from a reduced N80 Gaussian grid to a 320x160 regular Gaussian grid. (These are designated as OTHER, or othr, variables below.) All variables are valid 6 hours after the forecast was initiated. Thus, 00Z 6-hour forecast evaporation is valid at 06Z. 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. 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://rda.ucar.edu/datasets/ds627.0].
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Related URL
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Link:
VIEW RELATED INFORMATION
Link: VIEW RELATED INFORMATION Description: ECMWF's ERA40 web site |
Geographic Coverage
| N: 89.142 | S: -89.142 | E: 180.0 | W: -180.0 |
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Data Set Citation
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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 T106 6-hourly 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 Research Online Resource: http://rda.ucar.edu/datasets/ds127.0/ |
Temporal Coverage
| Start Date: 1957-09-01 |
| Stop Date: 2002-08-31 |
Data Resolution
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Latitude Resolution:
1.125 degrees
Longitude Resolution: 1.121 degrees |
Science Keywords
| ATMOSPHERE >ALTITUDE >PLANETARY BOUNDARY LAYER HEIGHT [Definition] |
| ATMOSPHERE >ATMOSPHERIC PRESSURE >GRAVITY WAVE [Definition] |
| ATMOSPHERE >ATMOSPHERIC WATER VAPOR >EVAPORATION [Definition] |
| ATMOSPHERE >ATMOSPHERIC WINDS >WIND STRESS [Definition] |
| ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT [Definition] |
| ATMOSPHERE >PRECIPITATION >SNOW [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >HEAT FLUX [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >INCOMING SOLAR RADIATION [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >LONGWAVE RADIATION [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >OUTGOING LONGWAVE RADIATION [Definition] |
| ATMOSPHERE >ATMOSPHERIC RADIATION >SHORTWAVE RADIATION [Definition] |
| TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW MELT [Definition] |
| TERRESTRIAL HYDROSPHERE >SURFACE WATER >RUNOFF [Definition] |
ISO Topic Category
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CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Project
| ESIP >Earth Science Information Partners Program [Information] |
Access Constraints
| We are allowed to distribute this data to US scientists, scientists visiting US organizations, and Canadian scientists affiliated with UCAR member organizations only. |
Use Constraints
| The data can be used for non-commercial research only. |
Keywords
| ERA40DAS > ERA40 Data Assimilation System |
Data Set Progress
| COMPLETE |
Data Center
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Research Data Archive, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
[Information]
Data Center URL: http://rda.ucar.edu/ Dataset ID: 127.0
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Distribution
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Distribution_Size:
495.296 Gbytes
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Distribution_Format:
GRIB1 > GRIdded Binary form, Edition 1
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Personnel
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DAVE
STEPANIAK Role: TECHNICAL CONTACT Phone: (303)-497-1343 Fax: (303)-497-1291 Email: davestep at ucar.edu Contact Address: National Center for Atmospheric Research CISL/DSS P.O. Box 3000 City: Boulder Province or State: CO Postal Code: 80307 Country: U.S.A. |
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JOEY
COMEAUX Role: TECHNICAL CONTACT Phone: (303)-497-1256 Fax: (303)-497-1291 Email: joey at ucar.edu Contact Address: National Center for Atmospheric Research CISL/DSS P.O. Box 3000 City: Boulder Province or State: CO Postal Code: 80307 Country: U.S.A. |
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BOB
DATTORE Role: DIF AUTHOR Phone: (303)-497-1825 Fax: (303)-497-1291 Email: dattore at ucar.edu Contact Address: National Center for Atmospheric Research CISL/DSS P.O. Box 3000 City: Boulder Province or State: CO Postal Code: 80307 Country: U.S.A. |
Creation and Review Dates
Last DIF Revision Date:
2013-05-23
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