Hurrell's North Atlantic Oscillation (NAO) Index from NCAR
Entry ID: NCAR_NAO

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Summary
Abstract: The North Atlantic Oscillation (NAO) is based on the difference of
normalized sea level pressure (SLP) between Lisbon, Portugal or Ponta
Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1864. The
SLP anomalies at each station were normalized by division of each
seasonal pressure by the long-term (1864--1983) standard
deviation. The station data were obtained from the World Monthly
Surface Station Climatology: http://dss.ucar.edu/datasets/ds570.0/

Station data includes:
Extended Winter (Dec - Mar) index of the NAO based on the difference of
normalized sea level pressure (SLP) between Lisbon, Portugal and
Stykkisholmur/Reykjavik, Iceland since 1864.

Seasonal (DJF,MAM,JJA,SON) indices of the NAO are based on the
difference of normalized sea level pressure (SLP) between Ponta
Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1864.

Annual: The annual index of the NAO is based on the difference of
normalized sea level pressure (SLP) between Ponta Delgada, Azores and
Stykkisholmur/Reykjavik, Iceland since 1864.

The values in the above table differ slightly from those in Hurrell
(1995) because of continual updates to the data and a change in the
base period. The SLP anomalies at each station were normalized
relative to the 120-year period 1864--1983. Hurrell (1995) normalized
relative to 1864--1994.

Related URL
Link: GET DATA
Description: Monthly and Seasonal NAO data from station-based indices


Link: VIEW RELATED INFORMATION
Description: The NAO Thematic Web Site


Geographic Coverage
 N: 64.0 S: 38.0  E: -9.0  W: -22.0

Data Set Citation
Dataset Originator/Creator: Hurrell, J.W.
Dataset Title: Decadal trends in the North Atlantic Oscillation: Regional temperatures and precipitation
Dataset Series Name: Science
Dataset Release Date: 1995
Dataset Publisher: AAAS
Issue Identification: 269
Online Resource: http://www.cgd.ucar.edu/cas/jhurrell/


Temporal Coverage
Start Date: 1864-01-01


Location Keywords
OCEAN > ATLANTIC OCEAN
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > AZORES
CONTINENT > EUROPE > NORTHERN EUROPE > ICELAND
CONTINENT > EUROPE > WESTERN EUROPE > PORTUGAL


Data Resolution
Temporal Resolution: Annual, Seasonal


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >DIFFERENTIAL PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >OSCILLATIONS    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >PRESSURE ANOMALIES    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >NORTH ATLANTIC OSCILLATION >NAO    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
GROUND STATIONS    [Information]


Project
ESIP >Earth Science Information Partners Program    [Information]


Keywords
CLIMATE INDEX
CLIMATE INDICES
CLIMATOLOGY
NAO
SLP
NORTH ATLANTIC OSCILLATION


Data Set Progress
IN WORK


Originating Center
NCAR


Data Center
Climate and Global Dynamics Division, National Center for Atmospheric Research, University Corporation for Atmospheric Research    [Information]
Data Center URL: http://www.cgd.ucar.edu/

Data Center Personnel
Name: CLIMATE AND GLOBAL DYNAMICS DIVISION
Phone: 303.497.1740
Email: cwimert at cgd.ucar.edu
Contact Address:
National Center for Atmospheric Research
P.O. Box 3000
City: Boulder
Province or State: CO
Postal Code: 80307-3000
Country: USA



Distribution
Distribution_Media: online
Distribution_Format: ASCII
Fees: None


Personnel
JAMES W. HURRELL
Role: INVESTIGATOR
Email: jhurrell at ucar.edu


SCOTT A. RITZ
Role: DIF AUTHOR
Phone: 301-614-5126
Fax: 301-614-5268
Email: Scott.A.Ritz at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: Maryland
Postal Code: 20771
Country: USA


Publications/References
J.W. Hurrell, Y. Kushnir, G. Ottersen, and M. Visbeck (2003), The North Atlantic Oscillation: Climate Significance and Environmental Impact, Eds. Geophysical Monograph Series, 134, 279

Hurrell, J. W. (1995), Decadal trends in the North Atlantic Oscillation: Regional temperatures and precipitation, Science, 269, 676-679

Hurrell, J. W. (1996), Influence of variations in extratropical wintertime teleconnections on Northern Hemisphere temperatures, Geophys. Res. Lett., 23, 665-668, For a list of published papers, papers in press and white papers, see:
http://www.cgd.ucar.edu/cas/jhurrell/

Creation and Review Dates
Last DIF Revision Date: 2011-04-06

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