Articles | Volume 20, issue 3
Research article
02 Apr 2024
Research article |  | 02 Apr 2024

Early 20th century Southern Hemisphere cooling

Stefan Brönnimann, Yuri Brugnara, and Clive Wilkinson

Data sets

Daily temperature and sea-level pressure fields for the Southern Hemisphere 1901-1930 S. Brönnimann

GISS Surface Temperature Analysis (GISTEMP) GISTEMP Team

NOAA-CIRES-DOE Twentieth Century Reanalysis Version 3 L. C. Slivinski et al.

ModE-RA - A global monthly paleo-reanalysis to study climate variability during the past 600 years V. Valler et al.

Berkeley Earth Combined Land and Ocean Temperature Field, Jan 1850--Nov 2019 Rohde, R. and Hausfather, Z.

NOAA Global Surface Temperature Dataset (NOAAGlobalTemp), Version 5.1 R. S. Vose et al.

Short summary
The early 20th century warming – the first phase of global warming in the 20th century – started from a peculiar cold state around 1910. We digitised additional ship logbooks for these years to study this specific climate state and found that it is real and likely an overlap of several climatic anomalies, including oceanic variability (La Niña) and volcanic eruptions.