np_climate: North Pacific Climate Indices: Monthly and Seasonal Means

In nwfsc-timeseries/atsa-package: Packages, data and scripts for ATSA course and lab book

North Pacific Climate Indices: Monthly and Seasonal Means

Description

Datasets containing monthly, seasonal, and annual averages of climate indices relevant to the North Pacific. All indices are sourced from NOAA PSL Climate Indices.

Usage

data(np_climate)

Format

A data frame with one row per month:

date

Date of the observation (first day of month).

year

Year.

month

Month name (e.g., "Jan", "Feb", etc.).

pna

Pacific-North American pattern (PNA) index. Measures atmospheric variability over North America and the North Pacific.

epo

East Pacific Oscillation (EPO) index. Measures pressure anomalies across the eastern North Pacific.

wp

Western Pacific (WP) pattern index. Describes variability over the western Pacific and eastern Asia.

censo

Central ENSO (CENSO) index. ENSO variability focusing on central Pacific SST anomalies.

whwp

Western Hemisphere Warm Pool (WHWP) index. Measures the area of ocean surface temperatures >28.5°C in the Atlantic and eastern Pacific.

oni

Oceanic Niño Index (ONI). A common index to monitor El Niño/La Niña events.

meiv2

Multivariate ENSO Index Version 2 (MEI.v2). A multivariate index combining several ENSO-related variables.

pdo

Pacific Decadal Oscillation (PDO) index. Long-term ocean temperature fluctuations in the North Pacific.

ipotpi

Indo-Pacific Ocean Temperature Pattern Index (IPOTPI). Measures SST patterns related to tropical Indo-Pacific variability.

np

North Pacific Index (NPI). Area-averaged sea level pressure over the North Pacific.

pacwarm

Pacific Warm Pool index (PACWARMPOOL). Area-averaged SST anomalies in the warm pool region of the Pacific.

gmsst

Global Mean Sea Surface Temperature (GMSST) anomalies.

Seasonal and Annual Data: np_climate_seasonal

Seasonal and annual averages of each climate index.

Seasons are defined as:

• Winter: January, February, March

• Spring: April, May, June

• Summer: May, June, July, August

• Fall: September, October, November

Note: Some months (May and June) are included in both spring and summer means.

A data frame with one row per year:

year

Year.

.

Mean index value for that season (e.g., pdo.spring, oni.winter).

.annual

Annual mean across all months for that index (e.g., pdo.annual, oni.annual).

Objects of class "data.frame".

Details

Monthly Data: np_climate_month

Climate indices recorded at monthly resolution.

Source

Data retrieved from NOAA PSL Climate Indices:

• https://psl.noaa.gov/data/correlation/pna.data

• https://psl.noaa.gov/data/correlation/epo.data

• https://psl.noaa.gov/data/correlation/wp.data

• https://psl.noaa.gov/data/correlation/censo.data

• https://psl.noaa.gov/data/correlation/whwp.data

• https://psl.noaa.gov/data/correlation/oni.data

• https://psl.noaa.gov/enso/mei/data/meiv2.data

• https://psl.noaa.gov/pdo/data/pdo.timeseries.ersstv5.data

• https://psl.noaa.gov/data/timeseries/IPOTPI/ipotpi.hadisst2.data

• https://psl.noaa.gov/data/correlation/np.data

• https://psl.noaa.gov/data/correlation/pacwarm.data

• https://psl.noaa.gov/data/correlation/gmsst.data

Examples

# Monthly PDO example
library(ggplot2)
ggplot(np_climate_month, aes(x = date, y = pdo)) +
  geom_line() +
  labs(title = "Pacific Decadal Oscillation (PDO) - Monthly",
       x = "Year",
       y = "PDO Index") +
  theme_minimal()

# Annual PDO example
ggplot(np_climate_seasonal, aes(x = year, y = pdo.annual)) +
  geom_line() +
  labs(title = "Pacific Decadal Oscillation (PDO) - Annual Mean",
       x = "Year",
       y = "PDO Index (Annual Mean)") +
  theme_minimal()

nwfsc-timeseries/atsa-package documentation built on June 9, 2025, 3:49 p.m.