NCEP Twice Daily Global Analysis

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: NOAA-CIRES Climate Diagnostics Center

Publication_Date: 19931031

Title: NCEP Twice Daily Global Analysis

Edition:

Geospatial_Data_Presentation_Form:

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Boulder, CO

Publisher: NOAA-CIRES Climate Diagnostics Center

Other_Citation_Details:

Online_Linkage: http://www.cdc.noaa.gov/cdc/data.nmc.html

Description:

Abstract:

NCEP prepares a twice-daily global analysis at 2.5 degrees resolution on pressure levels as a product of their operational forecast system. The original data set as stored at the National Center for Atmospheric Research (NCAR) starts in July 1976 and is being updated continuously at NCAR. We make a subset of this data available beginning in 1979. We also make available selected monthly mean datasets that go back in time (for the northern hemisphere). As part of a research project supported by the National Science Foundation, the NCEP data has been processed by NCAR into a convenient format for climatological studies. Some quality control and error-checking are done at this time. CDC has processed the twice-daily data by linearly interpolating to fill in missing values and then creating a daily average from the twice daily data. The data set provided is the (00Z + 12Z)/2. (i.e., analyzed) data. In the analysis process, the observations are interpolated to a grid. Because (1) large parts of the world (and many levels) have no observations and (2) the data are not taken at one time (data is included if it is within 6 hours of the forecast time), a model forecast is used to help with the interpolation. Therefore, technically speaking, the data provided is an analyzed data set, which is a blend of observational and model data. These analyses are then INITIALIZED. NOAAServer Codes: [POL 90 -90 180 -180] ; nodateline preview obtain Supplemental Information: Scientific research.

Purpose:

Not Available

Supplemental_Information:

Not Available

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19850101

Ending_Date: 19931031

Currentness_Reference:Unknown

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: -180.0

East_Bounding_Coordinate: 180.0

North_Bounding_Coordinate: 90.0

South_Bounding_Coordinate: -90.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > HUMIDITY

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS

Theme_Keyword: Ncep Twice Daily [pol 90.00 -90.00 180 -180]

Theme_Keyword: Air Temperature

Theme_Keyword: Geopotential Height

Theme_Keyword: Relative Humidity

Theme_Keyword: Sea Level Pressure

Theme_Keyword: U-wind

Theme_Keyword: V-wind

Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: GEOGRAPHIC REGION > GLOBAL

Access_Constraints: None.

Use_Constraints:

None. Acknowledgement of CDC would appreciated in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: ESRL/PSD DATA INQUIRIES

Contact_Position: TECHNICAL CONTACT

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Contact_Electronic_Mail_Address: esrl.psd.data@noaa.gov

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Not Available

Logical_Consistency_Report:

Not Available

Completeness_Report:

Not Available

Lineage:

Process_Step:

Process_Description:

Not Available

Process_Date: Unknown

Spatial_Reference_Information:

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: DOC/NOAA/OAR/ESRL/PSD/CAB > Climate Analysis Branch, Physical Sciences Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce

Contact_Person: ESRL/PSD DATA INQUIRIES

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Contact_Electronic_Mail_Address: esrl.psd.data@noaa.gov

Resource_Description: CDC024

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Not Available

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.esrl.noaa.gov/psd/psd1/

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.cdc.noaa.gov/data/gridded/data.nmc.html...

Access_Instructions:

Obtain this data set via HTML.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

ftp://ftp.cdc.noaa.gov/Datasets/ncep/twice.daily/

Access_Instructions:

Obtain this data set via FTP.

Fees: Not Available

Metadata_Reference_Information:

Metadata_Date: 20020311

Metadata_Review_Date: 20090706

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: ESRL/PSD DATA INQUIRIES

Contact_Position: TECHNICAL CONTACT

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Contact_Electronic_Mail_Address: esrl.psd.data@noaa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time