npi_annual: NPI - North Pacific Index annual values and anomalies

In pbs-assess/PACea: An R package of Pacific ecosystem information to help facilitate an ecosystem approach to fisheries management

NPI – North Pacific Index annual values and anomalies

Description

The North Pacific index measures interannual to decadal variations in atmospheric circulation across the North Pacific.

Usage

npi_annual

Format

A tibble also of class 'pacea_index' with columns:

year:

year of value

val:

absolute average winter value, hPa. The value for year $N$ refers to an average of the values in November $N-1$, December $N-1$, and January, February, and March for year $N$. For example, the 1999 annual value contains the average of November and December 1998 and January, February, and March 1999. Hence there is an 'NA' for 1899 as no monthly data for 1898.

anom:

anomalies of the annual winter values compared to the 1925-1989 mean of 1008.9 hPa, again with an 'NA' for 1899 TODO check.

Details

See '?npi_monthly' for details.

'npi_annual' contains annual average winter values and anomalies.

Author(s)

Andrew Edwards

Source

Generated from running 'data-raw/coastwide-indices/coastwide-indices.R'.

Examples

## Not run: 
npi_annual
plot(npi_annual)

## End(Not run)

pbs-assess/PACea documentation built on April 17, 2025, 11:36 p.m.