Identification

Title

Hurrell North Atlantic Oscillation (NAO) Index (PC-Based)

Abstract

The principal component (PC)-based indices of the North Atlantic Oscillation (NAO) are the time series of the leading Empirical Orthogonal Function (EOF) of SLP anomalies over the Atlantic sector, 20°-80°N, 90°W-40°E. These indices are used to measure the NAO throughout the year, tracking the seasonal movements of the Icelandic low and Azores high. Positive values of the NAO index are typically associated with stronger-than-average westerlies over the middle latitudes, more intense weather systems over the North Atlantic and wetter/milder weather over western Europe.

Resource type

dataset

Resource locator

Unique resource identifier

code

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

climatologyMeteorologyAtmosphere

Keywords

Keyword set

keyword value

Dataset

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2017-05-10

Keyword set

keyword value

Earth Science > Climate Indicators > Atmospheric/ Ocean Indicators > Teleconnections > North Atlantic Oscillation > NAO

originating controlled vocabulary

title

GCMD

reference date

date type

revision

effective date

2017-07-18

Geographic location

West bounding longitude

-90

East bounding longitude

30

North bounding latitude

80

South bounding latitude

20

Temporal reference

Temporal extent

Begin position

1899-01-01

End position

2017-08-31

Dataset reference date

date type

publication

effective date

1995-01-01

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

TXT

version of format

Constraints related to access and use

Constraint set

Use constraints

Dash and its services comply with policies set by UCAR and NCAR.

Limitations on public access

citation: NAO Index Data provided by the Climate Analysis Section, NCAR, Boulder, USA, Hurrell (2003). Updated regularly. Accessed DD Month YYYY. [list date you accessed the data].

Responsible organisations

Responsible party

contact position

Associate Scientist

organisation name

UCAR/NCAR - Climate and Global Dynamics Laboratory

email address

asphilli@ucar.edu

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

contact position

organisation name

UCAR/NCAR - Climate and Global Dynamics Laboratory

email address

asphilli@ucar.edu

responsible party role

pointOfContact

Metadata date

2023-11-12T10:05:02

Metadata language

eng