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README.md

Experiments in El Nino analysis and prediction

This software is connected to the Azimuth Code Project's Experiments in El Nino analysis and prediction.

R / netcdf-convertor.R.

This converts netCDF files containing surface temperature data from NOAA (eg air.sig995.1951.nc) into a format more easily readable by other programs in other languages. You will need to edit it to your requirements:

  • Change the working directory
  • Change the ranges of latitude and longitude
  • Change the range of years

As supplied, it converts 3 years for 4 grid points covering Scotland. I’ve put the Ludescher et al Pacific co-ordinates in comments. More instructions are in the script.

Then start R, and copy and paste the whole file into the R console. (There are other ways of running R scripts but this is simplest for novices).

R / grj / ludescher.R

Aimed at replicating Ludescher et al, 2013. As of 26 June 2014, it is close, but not identical. For an explanation see Part 4 of the El Niño Project series.

R / average-link-strength.txt

This file has the average link strength S as computed by ludescher.R at 10-day intervals, starting from day 730 and going until day 12040, where day 1 is the first of January 1948. For an explanation see Part 4 of the El Niño Project series.

R / average-link-strength-1948-2013.txt

The second column in this file lists the average link strengths S as computed by ludescher.R at 10-day intervals, starting from day 730, and going until day 24090, where day 1 is 1 January 1948. The first column numbers these items from 1 to 2337. For an explanation see Part 4 of the El Niño Project series.

R / average-link-strength-daily.txt

The second column in this file lists the average link strengths S as computed by Blake Pollard using a modified version of ludescher.R at daily intervals, starting from day 730 and going until day 24090, where day 1 is 1 January 1948. The first column numbers these items from 730 to 24090. For an explanation see Part 4 of the El Niño Project series.

R / average-link-strength-monthly.txt

The second column in this file lists the average link strengths S as computed by Blake Pollard using a modified version of ludescher.R at monthly intervals, starting from January 1950 and going until December 2013. The first column numbers these items from 1 to 768. For an explanation see Part 4 of the El Niño Project series.

R / grj / covariances-basin-vs-rest.R

Makes maps of the Pacific, one per quarter from 1951 to 1979, showing covariances of grid points with the "Ludescher et al basin"

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