NOAA/WDS Paleoclimatology - Temperature and Hydroclimate Reconstructions and GDGT Data since the Last Deglaciation from Laguna Llaviucu, Ecuador

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.

本存档古气候学研究数据集可通过隶属于美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）的国家环境信息中心（National Centers for Environmental Information, NCEI），在古气候学世界数据服务（World Data Service for Paleoclimatology, WDS）体系下获取。该数据集对应的NCEI研究分类为气候重建（Climate Reconstruction）。数据集涵盖气候重建与古湖沼学（paleolimnology）相关参数，研究区域位于厄瓜多尔。其时间覆盖范围为距今16800年至距今50年（以日历年份计，Before Present, BP）。如需了解参数与研究区域的详细信息，请查阅元数据（metadata）文档。使用该数据集时，请引用本研究。