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Tropical Andean climate variations since the last deglaciation.
Zhao, Boyang; Russell, James M; Blaus, Ansis; Nascimento, Majoi de Novaes; Freeman, Aaron; Bush, Mark B.
Afiliação
  • Zhao B; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912.
  • Russell JM; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912.
  • Blaus A; Institute for Global Ecology, Florida Institute of Technology, Melbourne, FL 32901.
  • Nascimento MN; Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam 1098 XH, The Netherlands.
  • Freeman A; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912.
  • Bush MB; Institute for Global Ecology, Florida Institute of Technology, Melbourne, FL 32901.
Proc Natl Acad Sci U S A ; 121(34): e2320143121, 2024 Aug 20.
Article em En | MEDLINE | ID: mdl-39133850
ABSTRACT
Global warming during the Last Glacial Termination was interrupted by millennial-scale cool intervals such as the Younger Dryas and the Antarctic Cold Reversal (ACR). Although these events are well characterized at high latitudes, their impacts at low latitudes are less well known. We present high-resolution temperature and hydroclimate records from the tropical Andes spanning the past ~16,800 y using organic geochemical proxies applied to a sediment core from Laguna Llaviucu, Ecuador. Our hydroclimate record aligns with records from the western Amazon and eastern and central Andes and indicates a dominant long-term influence of changing austral summer insolation on the intensity of the South American Summer Monsoon. Our temperature record indicates a ~4 °C warming during the glacial termination, stable temperatures in the early to mid-Holocene, and slight, gradual warming since ~6,000 y ago. Importantly, we observe a ~1.5 °C cold reversal coincident with the ACR. These data document a temperature change pattern during the deglaciation in the tropical Andes that resembles temperatures at high southern latitudes, which are thought to be controlled by radiative forcing from atmospheric greenhouse gases and changes in ocean heat transport by the Atlantic meridional overturning circulation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2024 Tipo de documento: Article País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Ano de publicação: 2024 Tipo de documento: Article País de publicação: Estados Unidos