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ERA40 T85 Monthly Mean Surface Analysis and Surface Forecast Fields, created at NCAR

Entry ID: NCAR_DS126.0

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Summary

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://rda.ucar.edu/datasets/ds627.0].

Related URL

Link: VIEW RELATED INFORMATION

Description: ECMWF's ERA40 web site

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 Research

Online Resource: http://rda.ucar.edu/datasets/ds126.0/

Temporal Coverage

Start Date: 1957-09-01

Stop Date: 2002-08-31

Data Resolution

Latitude Resolution: 1.375 degrees
Longitude Resolution: 1.4 degrees
Horizontal Resolution Range: 100 km - < 250 km or approximately 1 degree - < 2.5 degrees

Science Keywords

ATMOSPHERE > AIR QUALITY > TROPOSPHERIC OZONE

ATMOSPHERE > ALTITUDE > PLANETARY BOUNDARY LAYER HEIGHT

ISO Topic Category

IMAGERY/BASE MAPS/EARTH COVER

Platform

TRMM > Tropical Rainfall Measuring Mission

Instrument

RADAR > Radio Detection and Ranging

Project

EOS > Earth Observing System

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

TRMM > Tropical Rainfall Measuring Mission Project

Quality Data quality check and control are applied to generate the
TRMM_GV_1C51 data. Each file has a quality control mask for both
reflectivity and differential reflectivity. Data are truncated at 200
km (slant range). The quality control mask consists of values from -99
to 99, with -99 indicating a deletion and 99 indicating that ...

Access Constraints None

Ancillary Keywords

EOSDIS

Data Set Progress

IN WORK

Originating Center

GSFC_DAAC

Data Center

Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

Data Center URL: http://disc.gsfc.nasa.gov/

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP Phone: 301-614-5224 Fax: 301-614-5268 Email: gsfc-help-disc at lists.nasa.gov Contact Address: Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Distribution

Distribution Media: Online (FTP)

Distribution Size: average file size: 1924 KB

Distribution Format: HDF

Fees: none

Personnel

BRAD FERRIER

Role: INVESTIGATOR

Phone: (301)763-8000 x7290

Fax: 301)763-8545

Email: brad.ferrier at noaa.gov

Contact Address:

NOAA/NWS/NCEP/EMC

City: Camp Springs

Province or State: MD

Postal Code: 20705-2675

Country: USA

HYDROLOGY DATA SUPPORT TEAM

Role: TECHNICAL CONTACT

Phone: (301) 614-5165

Fax: (301) 614-5268

Email: gsfc-help-disc at lists.nasa.gov

Contact Address:

Hydrology Data Support Team, Code 610.2

Goddard Space Flight Center

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

RUNHUA YANG

Role: DIF AUTHOR

Phone: 301-614-5251

Fax: 301-614-6297

Email: ryang at gmao.gsfc.nasa.gov

Contact Address:

NASA

Goddard Space Flight Center

Mailstop 610.1

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

Publications/References

Interface Control Specification Between the Tropical Rainfall
Measuring Mission Science Data and Information System (TSDIS) and the
TSDIS Science User (TSU). Volume 3: File Specifications for TRMM
products-Level 1. NASA Goddard Space Flight Center.

Rosenfeld, D., E. Amitai, and D. B. Wolff, 1995: "Classification of
rain regimes by the three-dimensional properties of reflectivity
fields," J. Appl. Meteor., 34, 198-211.

Joint Center for Earth System Technology (JCET) home page:
http://www.jcet.umbc.edu/ .

Creation and Review Dates

DIF Creation Date: 2007-01-31

Last DIF Revision Date: 2009-08-26

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