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Global temperature modes shed light on the Holocene temperature conundrum
Jürgen Bader1,2, Johann Jungclaus3, Natalie Krivova4
1Max-Planck-Institut für Meteorologie, Hamburg, Germany. juergen.bader@mpimet.mpg.de.
Nature Communications
|September 19, 2020
Summary
Conflicting Holocene temperature reconstructions show both warming and cooling trends. This study reveals two distinct modes, warming and cooling, explaining the divergent global temperature evolution and proxy data interpretation.
Area of Science:
- Paleoclimatology
- Climate modeling
- Earth system science
Background:
- Holocene global mean annual temperature reconstructions present conflicting trends, with some indicating cooling and others warming during the late Holocene.
- Discrepancies in temperature reconstructions highlight challenges in accurately assessing past climate variability and long-term trends.
Purpose of the Study:
- To investigate the emergence of distinct global warming and cooling modes during the Holocene.
- To analyze the spatio-temporal patterns of annual temperature variability using climate model simulations.
- To reconcile conflicting Holocene temperature reconstructions and inform proxy data interpretation.
Main Methods:
- Spatio-temporal analysis of annual temperature variability from a transient climate model simulation of the Holocene.
- Identification and characterization of distinct warming and cooling modes within the simulated temperature data.
- Assessment of the influence of orbital variations and volcanic eruptions on Arctic sea-ice dynamics.
Main Results:
- Two dominant modes of temperature variability, a warming mode and a cooling mode, were identified in the Holocene climate simulation.
- The warming mode was most pronounced in the tropics, while the cooling mode was linked to Arctic sea-ice changes driven by orbital forcing and volcanic activity.
- The warming mode prevailed during the mid-Holocene, with the cooling mode becoming dominant in the late Holocene.
Conclusions:
- The interplay between warming and cooling modes explains the divergent global temperature trends observed in different Holocene reconstructions.
- Findings underscore the importance of considering spatio-temporal variability and distinct climate modes when interpreting paleoclimate proxy data.
- The study provides crucial insights for selecting appropriate proxy locations to accurately reconstruct global mean temperatures and understand past climate dynamics.
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