rsoi

An R package to download the most up to date of these climate indices:

• Southern Oscillation Index
• Oceanic Nino Index
• North Pacific Gyre Oscillation
• North Atlantic Oscillation
• Arctic Oscillation
• Antarctic Oscillation
• Multivariate ENSO Index Version 2

Installation

For the development version

install.packages("rsoi")

library(rsoi)
library(tibble)

Usage

Download Oceanic Nino Index data

oni <- download_oni()
head(oni)
#> # A tibble: 6 x 7
#>   Date       Month  Year dSST3.4   ONI ONI_month_window phase             
#>   <date>     <ord> <int>   <dbl> <dbl> <chr>            <fct>             
#> 1 1950-01-01 Jan    1950   -1.62 NA    JF               <NA>              
#> 2 1950-02-01 Feb    1950   -1.32 -1.34 JFM              Warm Phase/El Nino
#> 3 1950-03-01 Mar    1950   -1.07 -1.17 FMA              Warm Phase/El Nino
#> 4 1950-04-01 Apr    1950   -1.11 -1.18 MAM              Warm Phase/El Nino
#> 5 1950-05-01 May    1950   -1.37 -1.07 AMJ              Warm Phase/El Nino
#> 6 1950-06-01 Jun    1950   -0.74 -0.85 MJJ              Warm Phase/El Nino

And a quick plot to illustrate the data:

barcols <- c('#edf8b1','#7fcdbb','#2c7fb8')

barplot(oni$ONI, names.arg = oni$Date, ylab = "Oceanic Nino Index" , 
    col = barcols[oni$phase], border = NA, space = 0,
    xaxt = "n")

Inspired by

The idea for this package borrows heavily from the rpdo package. The initial efforts by these authors are gratefully acknowledged. The rpdo github page can be found here: rpdo

Data Sources

• Southern Oscillation Index: https://www.ncdc.noaa.gov/teleconnections/enso/indicators/soi/
• Oceanic Nino Index data: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/detrend.nino34.ascii.txt
• Northern Pacific Gyre Oscillation: http://www.o3d.org/npgo/data/NPGO.txt
• North Atlantic Oscillation: https://www.ncdc.noaa.gov/teleconnections/nao/data.csv
• Arctic Oscillation: https://www.ncdc.noaa.gov/teleconnections/ao/data.csv
• Anarctic Oscillation: https://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/aao/monthly.aao.index.b79.current.ascii
• Multivariate ENSO Index Version 2 (MEI.v2): https://www.esrl.noaa.gov/psd/enso/mei/

Helpful References

In Watching for El Niño and La Niña, NOAA Adapts to Global Warming

L’Heureux, M. L., Collins, D. C., & Hu, Z.-Z. (2012, March.). Linear trends in sea surface temperature of the tropical Pacific Ocean and implications for the El Niño-Southern Oscillation. Climate Dynamics, 1–14. doi:10.1007/s00382-012-1331-2

The Victoria mode in the North Pacific linking extratropical sea level pressure variations to ENSO

Please note that the ‘rsoi’ project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.