MA_HIRS2_AM_OMA
001
This is the first version of this data produced
Gridded Monthly Time-Mean Observation minus Analysis (oma) Values 0.5 x 0.667 degree V001 (MA_HIRS2_AM_OMA) at GES DISC
Global Modeling and Assimilation Office (GMAO)
Gridded Monthly Time-Mean Observation minus Analysis (oma) Values V001
MA_HIRS2_AM_OMA
2011-06-01T00:00:00.000Z
Greenbelt, MD, USA
Goddard Earth Sciences Data and Information Services Center (GES DISC)
001
Digital Science Data
https://disc.gsfc.nasa.gov/datacollection/MA_HIRS2_AM_OMA_001.html
METADATA AUTHOR
DANA
OSTRENGA
Code 610.2 Bldg 32 Rm S151
NASA Goddard Space Flight Center
Greenbelt
MD
21230
USA
301-614-5475
Telephone
301-614-5268
Fax
dana.ostrenga@nasa.gov
INVESTIGATOR
ARLINDO
DASILVA
NASA/Goddard Space Flight Center
Global Modeling and Assimilation Office
Code 610.1
Greenbelt
MD
20771
USA
Arlindo.Dasilva@nasa.gov
TECHNICAL CONTACT
GLOBAL MODELING AND ASSIMILATION OFFICE
NASA Goddard Space Flight Center
Code 610.1
Greenbelt
MD
20771
USA
301-614-6142
Telephone
data@gmao.gsfc.nasa.gov
EARTH SCIENCE
ATMOSPHERE
ALTITUDE
BAROMETRIC ALTITUDE
EARTH SCIENCE
LAND SURFACE
TOPOGRAPHY
TERRAIN ELEVATION
EARTH SCIENCE
LAND SURFACE
LAND USE/LAND COVER
LAND USE/LAND COVER CLASSIFICATION
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ENVIRONMENT
ELEVATION
GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER
Not provided
MERRA
Modern-Era Retrospective Analysis for Research and Applications
NOT APPLICABLE
false
2005-01-01T00:00:00.000Z
2006-09-30T23:59:59.000Z
COMPLETE
CARTESIAN
CARTESIAN
-90
90
-180
180
Not provided
GEOGRAPHIC REGION
GLOBAL
MERRA TIME-MEAN OBSERVATION DATA
MERRA for Research and Applications Gridded Monthly Time-Mean Observation Dataset
The Earth Observing System Data and Information System (EOSDIS) data use policy for NASA data can be accessed at https://earthdata.nasa.gov/earth-observation-data/data-use-policy. For information on how to properly cite and acknowledge data from the NASA GES DISC, refer to https://disc.gsfc.nasa.gov/information/documents?title=data-policy.
English
ARCHIVER
NASA/GSFC/SED/ESD/GCDC/GESDISC
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
https://disc.gsfc.nasa.gov/
DATA CENTER CONTACT
GES DISC HELP DESK SUPPORT GROUP
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt
MD
20771
USA
301-614-5224
Telephone
301-614-5268
Fax
gsfc-dl-help-disc@mail.nasa.gov
Online Archive
HDF5
Free
The differences between the observations and the forecast background used for the analysis (the innovations or O-F for short) and those between the observations and the final analysis (O-A) are by-products of any assimilation system and provide information about the quality of the analysis and the impact of the observations. Innovations have been traditionally used to diagnose observation, background and analysis errors at observation locations (Hollingsworth and Lonnberg 1989; Dee and da Silva 1999). At the most simplistic level, innovation variances can be used as an upper bound on background errors, which are, in turn, an upper bound on the analysis errors. With more processing (and the assumption of optimality), the O-F and O-A statistics can be used to estimate observation, background and analysis errors (Desroziers et al. 2005). They can also be used to estimate the systematic and random errors in the analysis fields. Unfortunately, such data are usually not readily available with reanalysis products. With MERRA, however, a gridded version of the observations and innovations used in the assimilation process is being made available. The dataset allows the user to conveniently perform investigations related to the observing system and to calculate error estimates. Da Silva (2011) provides an overview and analysis of these datasets for MERRA.
The innovations may be thought of as the correction to the background required by a given instrument, while the analysis increment (A-F) is the consolidated correction once all instruments, observation errors, and background errors have been taken into consideration. The extent to which the O-F statistics for the various instruments are similar to the A-F statistics reflects the degree of homogeneity of the observing system as a whole. Using the joint probability density function (PDF) of innovations and analysis increments, da Silva (2011) introduces the concepts of the effective gain (by analogy with the Kalman gain) and the contextual bias. In brief, the effective gain for an observation is a measure of how much the assimilation system has drawn to that type of observation, while the contextual bias is a measure of the degree of agreement between a given observation type and all other observations assimilated.
With MERRAs gridded observation and innovation data sets, a wealth of information is available for examination of the quality of the analyses and how the different observations impact the analyses and interact with each other. Such examinations can be conducted regionally or globally and should provide useful information for the next generation of reanalyses.
VIEW RELATED INFORMATION
USER'S GUIDE
https://goldsmr1.gesdisc.eosdis.nasa.gov/data/MERRAOBS_MONTHLY/MA_HIRS2_AM_OMA.001/doc/README.MERRA.pdf
product README file
GET RELATED VISUALIZATION
https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/MA_HIRS2_AM_OMA_001.png
MA_HIRS2_AM_OMA variable
DATA SET LANDING PAGE
https://disc.gsfc.nasa.gov/datacollection/MA_HIRS2_AM_OMA_001.html
Access the dataset landing page from the GES DISC website.
GET DATA
DATA TREE
https://goldsmr1.gesdisc.eosdis.nasa.gov/data/s4pa/MERRAOBS_MONTHLY/MA_HIRS2_AM_OMA.001/
Access the data via HTTP.
PROJECT HOME PAGE
https://gmao.gsfc.nasa.gov/
The GMAO home page
VIEW RELATED INFORMATION
https://disc.gsfc.nasa.gov/datasets?keywords=%22MERRA%22
The user unified interface at the GES DISC
VIEW RELATED INFORMATION
READ-ME
https://goldsmr1.gesdisc.eosdis.nasa.gov/data/s4pa/MERRAOBS_MONTHLY/MA_HIRS2_AM_OMA.001/doc/MERRAOBS.README.pdf
README Document
CEOS IDN DIF
VERSION 10.2
2007-06-14
2015-07-07
2007-06-14T00:00:00.000Z
2015-07-07T00:00:00.000Z
4
SCIENCE_QUALITY