NOAA/WDS Paleoclimatology - Northern Peru 250KYr Stalagmite Stable Isotope Data

Precise characterization of hydroclimate variability in Amazonia on various timescales is critical to understanding the link between climate change and biodiversity. Here we present absolute-dated speleothem oxygen isotope records that characterize hydroclimate variation in western and eastern Amazonia over the past 250 and 20 ka, respectively. Although our records demonstrate the coherent millennial-scale precipitation variability across tropical-subtropical South America, the orbital-scale precipitation variability between western and eastern Amazonia exhibits a quasi-dipole pattern. During the last glacial period, our records imply a modest increase in precipitation amount in western Amazonia but a significant drying in eastern Amazonia, suggesting that higher biodiversity in western Amazonia, contrary to 'Refugia Hypothesis', is maintained under relatively stable climatic conditions. In contrast, the glacial-interglacial climatic perturbations might have been instances of loss rather than gain in biodiversity in eastern Amazonia, where forests may have been more susceptible to fragmentation in response to larger swings in hydroclimate.

本存档的古气候学研究数据集可从美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）国家环境信息中心（National Centers for Environmental Information, NCEI）下属的古气候学世界数据服务中心（World Data Service for Paleoclimatology, WDS）获取。该研究对应的NCEI研究分类为洞穴类（Cave）。数据集包含秘鲁地区洞穴沉积物（speleothems）的相关参数，时间覆盖范围为距今246360至290个日历年（BP，即Before Present）。有关参数及研究地点的详细信息，请参阅元数据（metadata）。使用本数据集时请引用本研究。