Roles of insolation forcing and CO2 forcing on Late Pleistocene seasonal sea surface temperatures

Kyung Eun Lee (), Steven C. Clemens, Yoshimi Kubota, Axel Timmermann, Ann Holbourn, Sang-Wook Yeh, Si Woong Bae and Tae Wook Ko
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Kyung Eun Lee: Korea Maritime and Ocean University
Steven C. Clemens: Brown University
Yoshimi Kubota: National Museum of Nature and Science
Axel Timmermann: Pusan National University
Ann Holbourn: Institute of Geosciences, Christian-Albrechts-University
Sang-Wook Yeh: Hanyang University, ERICA
Si Woong Bae: Korea Maritime and Ocean University
Tae Wook Ko: Korea Maritime and Ocean University

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Late Pleistocene changes in insolation, greenhouse gas concentrations, and ice sheets have different spatially and seasonally modulated climatic fingerprints. By exploring the seasonality of paleoclimate proxy data, we gain deeper insight into the drivers of climate changes. Here, we investigate changes in alkenone-based annual mean and Globigerinoides ruber Mg/Ca-based summer sea surface temperatures in the East China Sea and their linkages to climate forcing over the past 400,000 years. During interglacial-glacial cycles, there are phase differences between annual mean and seasonal (summer and winter) temperatures, which relate to seasonal insolation changes. These phase differences are most evident during interglacials. During glacial terminations, temperature changes were strongly affected by CO2. Early temperature minima, ~20,000 years before glacial terminations, except the last glacial period, coincide with the largest temperature differences between summer and winter, and with the timing of the lowest atmospheric CO2 concentration. These findings imply the need to consider proxy seasonality and seasonal climate variability to estimate climate sensitivity.

Date: 2021
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DOI: 10.1038/s41467-021-26051-y

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