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If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.</gco:CharacterString>\r\n          </gmd:otherConstraints>\r\n        </gmd:MD_LegalConstraints>\r\n      </gmd:resourceConstraints>\r\n      <gmd:aggregationInfo>\r\n        <gmd:MD_AggregateInformation>\r\n          <gmd:aggregateDataSetName>\r\n            <gmd:CI_Citation>\r\n              <gmd:title>\r\n                <gco:CharacterString>The NCEP/NCAR 40-Year Reanalysis Project</gco:CharacterString>\r\n              </gmd:title>\r\n              <gmd:date>\r\n                <gmd:CI_Date>\r\n                  <gmd:date>\r\n                    <gco:Date>1996</gco:Date>\r\n                  </gmd:date>\r\n                  <gmd:dateType>\r\n                    <gmd:CI_DateTypeCode codeList=\"https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode\" codeListValue=\"publication\">publication</gmd:CI_DateTypeCode>\r\n                  </gmd:dateType>\r\n                </gmd:CI_Date>\r\n              </gmd:date>\r\n              <gmd:citedResponsibleParty>\r\n                <gmd:CI_ResponsibleParty>\r\n                  <gmd:individualName>\r\n                    <gco:CharacterString>Kalnay, E., M. 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The local ingestion process took only the 0Z, 6Z, 12Z, and 18Z forecasted values, and thus only those were used to make the daily time series and monthly means here. \r\nABSTRACT SUPPLIED BY ORIGINATOR: The NCEP and NCAR are cooperating in a project (denoted \u201creanalysis\u201d) to produce a 40-year record of global analyses of atmospheric fields in support of the needs of the research and climate monitoring communities. This effort involves the recovery of land surface, ship, rawinsonde, pibal, aircraft, satellite, and other data; quality controlling and assimilating these data with a data assimilation system that is kept unchanged over the reanalysis period 1957\u201396. This eliminates perceived climate jumps associated with changes in the data assimilation system. The NCEP/NCAR 40-yr reanalysis uses a frozen state-of-the-art global data assimilation system and a database as complete as possible. The data assimilation and the model used are identical to the global system implemented operationally at the NCEP on 11 January 1995, except that the horizontal resolution is T62 (about 210 km). The database has been enhanced with many sources of observations not available in real time for operations, provided by different countries and organizations. The system has been designed with advanced quality control and monitoring components, and can produce 1 mon of reanalysis per day on a Cray YMP/8 supercomputer. Different types of output archives are being created to satisfy different user needs, including a \u201cquick look\u201d CD-ROM (one per year) with six tropospheric and stratospheric fields available twice daily, as well as surface, top-of-the-atmosphere, and isentropic fields. Reanalysis information and selected output is also available on-line via the Internet (http//:nic.fb4.noaa.gov:8000). A special CD-ROM, containing 13 years of selected observed, daily, monthly, and climatological data from the NCEP/NCAR Re-analysis, is included with this issue. Output variables are classified into four classes, depending on the degree to which they are influenced by the observations and/or the model. For example, \u201cC\u201d variables (such as precipitation and surface fluxes) are completely determined by the model during the data assimilation and should be used with caution. Nevertheless, a comparison of these variables with observations and with several climatologies shows that they generally contain considerable useful information. Eight-day forecasts, produced every 5 days, should be useful for predictability studies and for monitoring the quality of the observing systems. The 40 years of reanalysis (1957\u201396) should be completed in early 1997. 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