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NLDAS Primary Forcing Data L4 Hourly 0.125 x 0.125 degree V002 (NLDAS_FORA0125_H) at GES DISC
Entry ID: GES_DISC_NLDAS_FORA0125_H_V002

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Summary
Abstract: This data set contains the primary forcing data "File A" for Phase 2 of the North American Land Data Assimilation System (NLDAS-2). The data are in 1/8th degree grid spacing and range from Jan 1979 to the present. The temporal resolution is hourly. The file format is WMO GRIB-1.

Details about the generation of the NLDAS-2 forcing data sets can be found in Xia et al. (2012).

The non-precipitation land surface forcing fields for NLDAS-2 are derived from the analysis fields of the NCEP North American Regional Reanalysis (NARR). NARR analysis fields are 32-km spatial resolution and 3-hourly temporal frequency. Those NARR fields that are utilized to generate NLDAS-2 forcing fields are spatially interpolated to the finer resolution of the NLDAS 1/8th-degree grid and then temporally disaggregated to the NLDAS hourly frequency. Additionally, the fields of surface pressure, surface downward longwave radiation, near-surface air temperature, and near-surface specific humidity are adjusted vertically to account for the vertical difference between the NARR and
NLDAS fields of terrain height. This vertical adjustment applies the traditional vertical lapse rate of 6.5 K/km for air temperature. The details of the spatial interpolation, temporal disaggregation, and vertical adjustment are those employed in NLDAS-1, as presented by Cosgrove et al. (2003).

The surface downward shortwave radiation field in "File A" is a bias-corrected field wherein a bias-correction algorithm was applied to the NARR surface downward shortwave radiation. This bias correction utilizes five years (1996-2000) of the hourly 1/8th-degree GOES-based surface downward shortwave radiation fields derived by Pinker et al. (2003). The potential evaporation field in "File A" is that computed in NARR using the modified Penman scheme of Mahrt and Ek (1984).

The precipitation field in "File A" is not the NARR precipitation forcing, but is rather a product of a temporal disaggregation of a gauge-only CPC analysis of daily precipitation, performed directly on the NLDAS grid and including an orographic adjustment based on the widely-applied PRISM climatology. The precipitation is temporally disaggregated into hourly fields by deriving hourly disaggregation weights from either WSR-88D Doppler radar-based precipitation estimates, 8-km CMORPH hourly precipitation analyses, or NARR-simulated precipitation (based on availability, in order). The latter fields from radar, CMORPH, and NARR are used only to derive disaggregation weights and do not change the daily total precipitation. The field in "File A" that gives the fraction of total precipitation that is convective is an estimate derived from the following two NARR precipitation fields (which are provided in "File B"): NARR total precipitation and NARR convective precipitation (the latter is less than or equal to the NARR total precipitation and can be zero). The Convective Available Potential Energy (CAPE) is the final variable in the forcing data set, also interpolated from NARR.

The hourly land surface forcing fields for NLDAS-2 are grouped into two GRIB files, "File A" and "File B". "File A" is the primary (default) forcing file and contains eleven fields. The data set applies a user-defined parameter table to indicate the contents and parameter number. The GRIBTAB file (http://disc.sci.gsfc.nasa.gov/hydrology/grib_tabs/gribtab_NLDAS_FORA_hourly.002.txt) shows a list of parameters for this data set, along with their Product Definition Section (PDS) IDs and units.

For more information, please see the README Document at ftp://hydro1.sci.gsfc.nasa.gov/data/s4pa/NLDAS/README.NLDAS2.pdf.

Related URL
Link: GET DATA > ON-LINE ARCHIVE
Description: Access the data via FTP.


Link: GET DATA > MIRADOR
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Link: GET DATA > SSW
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Link: GET DATA > REVERB
Description: Search and retrieve data with Reverb ECHO


Link: GET DATA > GIOVANNI
Description: The GES-DISC Interactive Online Visualization ANd aNalysis Interface (Giovanni) is a web-based tool that allows users to analyze gridded data interactively online without having to download any data.


Link: GET DATA > GDS
Description: The GrADS Data Server (GDS, formerly known as GrADS-DODS Server) is another form of OPeNDAP that provides subsetting and some analysis services across the internet.


Link: VIEW EXTENDED METADATA
Description: The GRIBTAB file contains a list of variables, along with the GRIB Product Definition Section (PDS) ID, variable short name, long names, and unit.


Link: VIEW EXTENDED METADATA
Description: The Grid Analysis and Display System (GrADS) data descriptor file contains a complete description of the binary data as well as instructions for GrADS on where to find the data and how to read it.


Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: README document


Link: VIEW RELATED INFORMATION
Description: NLDAS Project Web Site


Link: VIEW RELATED INFORMATION > HOW-TO
Description: GES DISC Services Cookbook main page


Geographic Coverage
 N: 53.0 S: 25.0  E: -67.0  W: -125.0

Data Set Citation
Dataset Originator/Creator: Xia, Y., et al., NCEP/EMC
Dataset Title: NLDAS Primary Forcing Data L4 Hourly 0.125 x 0.125 degree
Dataset Series Name: NLDAS_FORA0125_H
Dataset Release Date: 08.01.2009
Dataset Release Place: Greenbelt, Maryland, USA
Dataset Publisher: Goddard Earth Sciences Data and Information Services Center (GES DISC)
Version: 002
Dataset Editor: David Mocko, NASA/GSFC/HSL
Data Presentation Form: Digital Science Data
Dataset DOI: 10.5067/6J5LHHOHZHN4
Online Resource: http://disc.sci.gsfc.nasa.gov/datacollection/NLDAS_FORA0125_H_V002....


Temporal Coverage
Start Date: 1979-01-01


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GREAT LAKES
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALABAMA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ARIZONA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ARKANSAS
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > COLORADO
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CONNECTICUT
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DELAWARE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DISTRICT OF COLUMBIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > IDAHO
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ILLINOIS
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > INDIANA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > IOWA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > KANSAS
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > KENTUCKY
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > LOUISIANA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MARYLAND
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MASSACHUSETTS
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MICHIGAN
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MINNESOTA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MISSISSIPPI
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MISSOURI
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MONTANA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEBRASKA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEVADA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW HAMPSHIRE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW JERSEY
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW MEXICO
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH CAROLINA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH DAKOTA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OHIO
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OKLAHOMA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OREGON
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > PENNSYLVANIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > RHODE ISLAND
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > SOUTH CAROLINA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > SOUTH DAKOTA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TENNESSEE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TEXAS
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > UTAH
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > VERMONT
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > VIRGINIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WASHINGTON
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WEST VIRGINIA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WISCONSIN
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WYOMING


Data Resolution
Latitude Resolution: 0.125 degree
Longitude Resolution: 0.125 degree
Temporal Resolution: hourly


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >SURFACE PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >EVAPORATION    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >LONGWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SHORTWAVE RADIATION    [Definition]
ATMOSPHERE >PRECIPITATION >LIQUID PRECIPITATION >RAIN    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >AIR TEMPERATURE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
Models/Analyses    [Information]
Forcing-LSM >Forcing data for Land Surface Model


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
NLDAS >North American Land Data Assimilation System    [Information]
CWIC >CEOS WGISS Integrated Catalog    [Information]


Quality
The data are provisional and subject to change as model improvements are implemented and new input data sets become available.


Access Constraints
None


Use Constraints
None


Keywords
Hydrology


Data Set Progress
IN WORK


Originating Center
NASA/GSFC/HSL and NCEP/EMC


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    [Information]
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 (HTTP)
Distribution_Format: GRIB
Fees: No Fee


Personnel
GES DISC HELP DESK SUPPORT GROUP
Role: TECHNICAL CONTACT
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


HUALAN RUI
Role: DIF AUTHOR
Phone: 301-614-5200
Fax: 301-614-5268
Email: Hualan.Rui at 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


Publications/References
Xia, Y., K. Mitchell, M. Ek, J. Sheffield, B. Cosgrove, E. Wood, L. Luo, C. Alonge, H. Wei, J. Meng, B. Livneh, D. Lettenmaier, V. Koren, Q. Duan, K. Mo, Y. Fan, and D. Mocko, (2012), Continental-scale water and energy flux analysis and validation for the North American Land Data Assimilation System project phase 2 (NLDAS-2): 1. Intercomparison and application of model products, J. Geophys. Res., 117, D03109, doi:10.1029/2011JD016048.

Cosgrove, B. A., D. Lohmann, K. E. Mitchell, P. R. Houser, E. F. Wood, J. Schaake, A. Robock, C. Marshall, J. Sheffield, L. Luo, Q. Duan, R. T. Pinker, J. D. Tarpley, R. W. Higgins, and J. Meng (2003), Real-time and retrospective forcing in the North American Land Data Assimilation System (NLDAS) project, J. Geophys. Res., 108(D22), 8842, doi:10.1029/2002JD003118.

Mahrt L., and M. Ek, 1984: The Influence of Atmospheric Stability on Potential Evaporation. J. Applied Meteorology, Vol 23, Issue 2, pp. 222–234. DOI: 10.1175/1520-0450(1984)023<0222:TIOASO>2.0.CO;2

Pinker, R. T., J. D. Tarpley, I. Laszlo, K. E. Mitchell, P. R. Houser, E. F. Wood, J. C. Schaake, A. Robock, D. Lohmann, B. A. Cosgrove, J. Sheffield, Q. Duan, L. Luo, and R. W. Higgins (2003), Surface radiation budgets in support of the GEWEX Continental-Scale International Project (GCIP) and the GEWEX Americas Prediction Project (GAPP), including the North American Land Data Assimilation System (NLDAS) project, J. Geophys. Res., 108(D22), 8844, doi:10.1029/2002JD003301.

Creation and Review Dates
DIF Creation Date: 2009-06-03
Last DIF Revision Date: 2016-01-20
Future DIF Review Date: 2015-04-30



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