Arctic Oscillation (AO) Index Data

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: David W. J. Thompson, John. M. Wallace,

Publication_Date: Unknown

Title: Arctic Oscillation (AO) Index Data

Edition:

Geospatial_Data_Presentation_Form:

Series_Information:

Series_Name:

Issue_Identification:

Publication_Information:

Publication_Place: Seattle, Washington, USA

Publisher: University of Washington Department of Atmospheric Sciences

Other_Citation_Details:

Online_Linkage:

Description:

Abstract:

The University of Washington Joint Institute for the Study of the Atmosphere and Ocean (JISAO) offers an Arctic Oscillation (AO) Index dataset. The Arctic Oscillation (AO) is defined as the leading EOF of Northern Hemisphere sea-level pressure anomalies poleward of 20N, weighted by area (Thompson and Wallace, 1998). The following indices are generated by projecting various anomaly fields onto the structure of the &AO&, defined here as the leading EOF of SLP poleward of 20N based on all months January 1958 to April 1997. All units are arbitrary. &http://ao.atmos.colostate.edu//Data/AO_TREN_NCEP_Jan1899Current.ascii& AO_TREN_NCEP_Jan1899Current.ascii MONTHLY INDEX January 1899 to present. Found by projecting the AO pattern onto SLP anomalies back to Jan 1899. Index starts Jan 1899, ends June 2002. Index values 1899-December 1957 are based on data described in Trenberth and Paolino (1980). Index values January 1958 to current are from the NCEP/NCAR Reanalysis. (Reference: Thompson and Wallace 2000) &http://ao.atmos.colostate.edu//Data/AO_SATindex_JFM_Jan1851March1997.ascii& AO_SATindex_JFM_Jan1851March1997.ascii MONTHLY INDEX BASED ON SAT DATA. January-March monthly-mean values from January 1851 to March 1997. The first column is the time axis in years (and fractions of years: i.e. 1958+0/3 would be Jan 1958, 1958+2/3 is March 1958, etc). The second column is the index values. In this case the index values are the expansion coefficient time series of the pattern of SAT anomalies associated with the AO. SAT data provided by P. D. Jones (Jones 1994) from the CRU. (Reference: Thompson and Wallace 2000) Additional AO Index data are available from: &http://www.atmos.colostate.edu/ao/Data/ao_index.html& and &http://jisao.washington.edu/data/aots/&

Purpose:

Not Available

Supplemental_Information:

REFERENCE: References: David W. J. Thompson and John. M. Wallace, 1998: The Arctic Oscillation signature in the wintertime geopotential height and temperature fields. Geophys. Res. Lett., 25, No. 9, 1297-1300.

Supplemental_Information:

REFERENCE: Thompson, D. W. J., and J. M. Wallace, 2000: Annular modes in the extratropical circulation. Part I: Month-to-month variability. J. Climate, 13, 1000-1016.

Supplemental_Information:

REFERENCE: Thompson, D. W. J., J. M. Wallace, and G. C. Hegerl, 2000: Annular modes in the extratropical circulation. Part II: Trends. J. Climate, 13, 1018-1036.

Supplemental_Information:

REFERENCE: For additional publications and links to abstracts and the above papers, see: "http://www.atmos.colostate.edu/ao/ResPapers/index.html"

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 18510101

Ending_Date: Unknown

Currentness_Reference:Unknown

Status:

Progress: In Work

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: 75.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > OSCILLATIONS

Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > PRESSURE ANOMALIES

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

Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > ARCTIC OSCILLATION > AO

Theme_Keyword: Arctic Oscillation

Theme_Keyword: Ao

Theme_Keyword: Northern Hemisphere Annular Mode

Theme_Keyword: Climate Index

Theme_Keyword: Climate Indices

Theme_Keyword: Climate Change

Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: GEOGRAPHIC REGION > ARCTIC

Place_Keyword: GEOGRAPHIC REGION > NORTHERN HEMISPHERE

Place_Keyword: GEOGRAPHIC REGION > POLAR

Access_Constraints: Not Available

Use_Constraints:

Please cite the dataset originator if you use this data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: DAVID W.J. THOMPSON

Contact_Position: INVESTIGATOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Department of Atmospheric Sciences

Address: Colorado State University

City: Fort Collins

State_or_Province: CO

Postal_Code: 80523

Country: USA

Contact_Electronic_Mail_Address: davet@atmos.colostate.edu

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: UWA/ATMOS/JISAO > Joint Institute for the Study of the Atmosphere and Ocean, Department of Atmospheric Sciences, University of Washington

Contact_Person: TODD MITCHELL

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Contact_Electronic_Mail_Address: mitchell@atmos.washington.edu

Resource_Description: JISAO_ARCTIC_AO

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.jisao.washington.edu/

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://jisao.washington.edu/data/aots/

Access_Instructions:

Access to AO Index documentation, graphs and data from 1899. Data includes monthly means and seasonal (JFM) means.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://ao.atmos.colostate.edu//Data/AO_TREN_NCEP_J...

Access_Instructions:

Monthly AO Indices from January 1899 to present based on data described in Trenberth and Paolino (1980).

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://ao.atmos.colostate.edu//Data/AO_SATindex_JF...

Access_Instructions:

Monthly AO Indices from January 1851 based on SAT data provided by P. D. Jones (Jones 1994) from the CRU.

Fees: None

Metadata_Reference_Information:

Metadata_Date: 19990727

Metadata_Review_Date: 20090413

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GCMD User Support Office

Contact_Organization: NASA Global Change Master Directory

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Not Available

City: Lanham

State_or_Province: MD

Postal_Code: 20706

Country: USA

Contact_Voice_Telephone: Not Available

Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time