Pacific/North American (PNA) Index since 1948
Entry ID: JISAO_PNA_PANAMERICAN

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Summary
Abstract: The University of Washington Joint Institute for the Study of the
Atmosphere and Ocean (JISAO) offers a Pacific/North American (PNA)
index covering the time period 1948-97. This page contains the PNA
index derived from the formula in Wallace and Gutzler (1981): PNA =
0.25 * [ Z(20N,160W) - Z(45N,165W) + Z(55N,115W) - Z(30N,85W) ] where
Z are standardized 500 hPa geopotential height values.

The input time series are standardized for each calendar month using
the entire period of record, and the resultant PNA series is
normalized using the standard deviation of the combined December,
January, February values. The data employed is the NCEP / NCAR
reanalysis.

[Summary extracted from the JISAO home page]
Related URL
Description: Access to PNA data and documentation

Description: The data employed is the NCEP / NCAR reanalysis. Link here
to view the original dataset.
Geographic Coverage
Spatial coordinates   
  N: 90.0   S: 10.0   E: 180.0   W: -180.0

Data Set Citation
Dataset Title: Pacific/North American (PNA) Index since 1948
Dataset Release Place: Seattle, Washington, USA
Dataset Publisher: Joint Institute for the Study of the Atmosphere and Ocean (JISAO)
Temporal Coverage
Start Date: 1948-01-01
Use Constraints Please cite the dataset orginator if you use this data.
Ancillary Keywords
Data Set Progress
IN WORK
Originating Center
Distribution
Distribution Media: Online (HTTP)
Distribution Format: ASCII
Fees: None
Publications/References
Wallace, J. M., and D. S. Gutzler, 1981: Teleconnections in the
geopotential height field during the Northern Hemisphere
Winter. Mon. Wea. Rev., 109, 784-812.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1999-07-30
Last DIF Revision Date: 2009-04-13
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