Reconstructed SST-NINO3.4 anomalies for the years 850 to 1981

<p>This data set gives values of reconstructed SST-NINO3.4 anomalies for the years 850 to 1981.</p> <p>SST-NINO3.4 is a key ENSO (El Ni&ntilde;o Southern Oscillation) index, defined as the spatial average of Sea Surface Temperature (SST) over the NINO3.4 spatial box (170&deg;W-120&deg;W, 5&deg;S-5&deg;N).</p> <p>The reconstructed SST-NINO3.4 anomalies are obtained from a new multiproxy reconstruction based on 45 proxy records obtained from the Past Global Changes 2k database (PAGES 2k Consortium, 2017, 2019) and a so-called Random Forest method. The reconstructed anomalies are relative to the 1870-2014 averaged SST-NINO3.4 obtained from the HadISST product (Rayner et al. 2003). Units are degrees Celsius</p>