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MEI.v2 is based on EOF analysis of level pressure, sea surface temperature, surface zonal winds, surface meridional winds, and Outgoing Longwave Radiation. The analysis is conducted for 12 partially overlapping 2-month "seasons".

Warm phase is defined as MEI index greater or equal to 0.5. Cold phase is defined as MEI index lesser or equal to -0.5.

Usage

download_mei(use_cache = FALSE, file = NULL)

Arguments

use_cache

logical option to save and load from cache. If `TRUE`, results will be cached in memory if `file` is `NULL` or on disk if `file` is not `NULL`.

file

optional character with the full path of a file to save the data. If `cache` is `FALSE` but `file` is not `NULL`, the results will be downloaded from the internet and saved on disk.

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: Bi-moonthly season of record

  • Year: Year of record

  • MEI: Multivariate ENSO Index Version 2

  • Phase: ENSO phase

Examples

if (FALSE) {
mei <- download_mei()
}