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Arctic Oscillation (AO) Index Data
Entry ID: JISAO_ARCTIC_AO


Summary
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.

Related URL
Link: View Related Information
Description: Access to AO Index documentation, graphs and data from 1899. Data
includes monthly means and seasonal (JFM) means.


Geographic Coverage
 N: 90.0 S: 75.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: David W. J. Thompson, John. M. Wallace,
Dataset Title: Arctic Oscillation (AO) Index Data
Dataset Release Place: Seattle, Washington, USA
Dataset Publisher: University of Washington Department of Atmospheric Sciences


Temporal Coverage
Start Date: 1851-01-01


Location Keywords
GEOGRAPHIC REGION > ARCTIC
GEOGRAPHIC REGION > NORTHERN HEMISPHERE
GEOGRAPHIC REGION > POLAR


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >OSCILLATIONS    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >PRESSURE ANOMALIES    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >ARCTIC OSCILLATION >AO    [Definition]


ISO Topic Category
null


Use Constraints
Please cite the dataset originator if you use this data.


Keywords
Arctic Oscillation
AO
Northern Hemisphere Annular Mode
climate index
climate indices
climate change


Data Set Progress
IN WORK


Data Center
Joint Institute for the Study of the Atmosphere and Ocean, Department of Atmospheric Sciences, University of Washington    [Information]
Data Center URL: http://www.jisao.washington.edu/

Data Center Personnel
Name: TODD MITCHELL
Email: mitchell at atmos.washington.edu



Distribution
Distribution_Media: Online (FTP)
Distribution_Format: ASCII
Fees: None


Personnel
DAVID W.J. THOMPSON
Role: INVESTIGATOR
Email: davet at atmos.colostate.edu
Contact Address:
Department of Atmospheric Sciences
Colorado State University
City: Fort Collins
Province or State: CO
Postal Code: 80523
Country: USA


Publications/References
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.

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.

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.

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

Creation and Review Dates
DIF Creation Date: 1999-07-27
Last DIF Revision Date: 2016-04-22



Link to Web Site