Archive Meta Data

Author(s)

Peter Ditlevsen and Susanne Ditlevsen

Title

Warning of a forthcoming collapse of the Atlantic meridional overturning circulation

Description

This is data and code for the paper: "Warning of a forthcoming collapse of the Atlantic meridional overturning circulation" published in Nature Communications, 2023.

The following files are included: 

Supplementary_Information.pdf
Pdf containing supplementary information for the paper.
S1: Maximum likelihood estimation from data following an Ornstein-Uhlenbeck process.
S2: Pseudo-likelihood estimation of the tipping time, based on Strang splitting.

AMOCestimation.html
File containing R code, explanations and figures from the paper.

AMOCestimation.Rmd
R Mark down file that produces the AMOCestimation.html file. The file needs access to the files below.

AMOCdata.txt 
Text file with the AMOC fingerprint. Contains the following variables:
"time" : time in years
"AMOC0" : sea surface temperature (SST) anamoli, corrected for seasonal variations
"AMOC1" : AMOC0 subtracted 1 x global mean
"AMOC2" : AMOC0 subtracted 2 x global mean
"GM"       : global mean temperature (GM)

SimulatedTraces.Rdata
R archive containing 3 elements:
xx.data : R data frame containing 1000 simulated traces
nsim : numerical variable containing number of simulated traces, equals 1000
Delta_t : time step in years used in the simulations, equals 1/12

EstimMatrix_1000repetitions.xlsx
Excel file containing the 1000 estimates from simulated data, used for constructing bootstrap confidence intervals.