Evolution of Pliocene-Pleistocene tropical terrestrial Andean temperature amplification

• 成果类型: Article
• 署名作者: Perez-Angel, Lina C.; Sepulveda, Julio; Molnar, Peter; Mora-Paez, Hector; Parrado, Angelica; Eaman, Katelyn; Russell, James; Rajagopalan, Balaji; Gonzalez-Arango, Catalina; Snell, Kathryn; Montes, Camilo; Crowley, James L.; Schmitz, Mark; Trayler, Robin B.
• 署名单位: Brown University; Brown University; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; Universidad de Manizales; State University of New York (SUNY) System; University at Albany, SUNY; University at Buffalo, SUNY; University of Colorado System; University of Colorado Boulder; Universidad de los Andes (Colombia); Universidad del Norte Colombia; Boise State University; University of California System; University of California Merced
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.2520191123
• 发表日期: 2026-02-10
• 页码: e2520191123
• 关键词: paleoclimate; Pliocene-Pleistocene; land surface temperature; terrestrial amplification; tropics; sea-surface temperature; POLLEN RECORD; south-america; colombia; climate; QUATERNARY; reveals; HISTORY; project; WARMTH

摘要

The Pliocene is the most recent epoch in which the Earth warmed under atmospheric CO2 levels similar to today (>400 ppm). The Pliocene then transitioned to the colder Pleistocene epoch, with the initiation of large-scale Northern Hemisphere glaciations. Although ocean temperature changes across these epochs are relatively well-known, quantitative estimates of the magnitude of land temperature change in the tropics are scarce. We provide a Plio-Quaternary quantitative air temperature record based on the distribution of bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs) preserved in sediments of the Funza-II core in the Sabana de Bogota, Colombia (similar to 4 degrees N). Using a refined age model based on new U-Pb zircon dates from ash layers, and a novel mixed-source model that disentangles contributions from lake- and soil-derived brGDGTs, we show that warm Pliocene (3.8 to 2.58 Ma) temperatures were 4.8(-1.4)(+1.8) degrees C warmer than the last similar to 800,000 y of the colder Pleistocene. The evolution of Pliocene-Pleistocene temperature in our record largely mirrors long-term tropical sea surface temperature (SST) cooling, highlighting the linkages between sea and land temperatures in the low latitudes via greenhouse-gas forcing. The median amplitude of Pliocene-Pleistocene cooling in the northern tropical Andes exceeds that predicted by theory, highlighting the importance of regional feedbacks including lapse rate adjustments and/or changes in Pacific SST gradients to the long-term evolution of Andean temperature. This first quantitative terrestrial temperature reconstruction within 5 degrees of the equator over the past 3.8 My highlights that both regional and global processes must be considered when constraining uncertainties for future warming scenarios.