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Download Southern Oscillation Index and Oceanic Nino Index data

Source: R/download-enso.R
download_enso.Rd

The Southern Oscillation Index is defined as the standardized difference between barometric readings at Darwin, Australia and Tahiti. The Oceanic Nino Index is average sea surface temperature in the Nino 3.4 region (120W to 170W) averaged over three months. Phases are categorized by Oceanic Nino Index:

  • Warm phase of El Nino/ Southern Oscillation when 3-month average sea-surface temperature departure of positive 0.5 degC

  • Cool phase of La Nina/ Southern Oscillation when 3-month average sea-surface temperature departure of negative 0.5 degC

  • Neutral phase is defined as when the three month temperature average is between +0.5 and -0.5 degC

Usage

download_enso(climate_idx = c("all", "soi", "oni", "npgo"), create_csv = FALSE)

Arguments

climate_idx

Choose which ENSO related climate index to output. Current arguments supported are soi (the Southern Oscillation Index), oni (the Oceanic Nino Index), npgo (the North Pacific Gyre Oscillation) and all. all outputs each supported index variable as a slimmer dataset than each individual climate index call.

create_csv

Logical option to create a local copy of the data. Defaults to FALSE.

Value

  • Date: Date object that uses the first of the month as a placeholder. Date formatted as date on the first of the month because R only supports one partial of date time

  • Month: Month of record

  • Year: Year of record

  • ONI: Oceanic Oscillation Index

  • phase: ENSO phase

  • SOI: Southern Oscillation Index

  • NPGO: North Pacific Gyre Oscillation

Examples

if (FALSE) {
enso <- download_enso()
}