Late Quaternary precipitation dynamics in the central Andes have been linked to both high- and low-latitude atmospheric teleconnections. We use present-day relationships between fecal pellet diameters from ashy chinchilla rats (Abrocoma cinerea) and mean annual rainfall to reconstruct the timing and magnitude of pluvials (wet episodes) spanning the past 16,000 years in the Atacama Desert based on 81 ¹⁴C-dated A. cinerea paleomiddens. A transient climate simulation shows that pluvials identified at 15.9 to 14.8, 13.0 to 8.6, and 8.1 to 7.6 ka B.P. can be linked to North Atlantic (high-latitude) forcing (e.g., Heinrich Stadial 1, Younger Dryas, and Bond cold events). Holocene pluvials at 5.0 to 4.6, 3.2 to 2.1, and 1.4 to 0.7 ka B.P. are not simulated, implying low-latitude internal variability forcing (i.e., ENSO regime shifts). These results help constrain future central Andean hydroclimatic variability and hold promise for reconstructing past climates from rodent middens in desert ecosystems worldwide.

中文翻译：

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过去 16,000 年高纬度和低纬度强迫驱动阿塔卡马沙漠降雨变化

安第斯山脉中部的晚第四纪降水动态与高纬度和低纬度大气遥相关有关。我们使用灰灰栗鼠 ( Abrocoma cinerea ) 粪便颗粒直径与年平均降雨量之间的关系，根据 81 ¹⁴ C-日期重建阿塔卡马沙漠过去 16,000 年的雨季（湿事件）的时间和大小灰霉病古中世纪。瞬态气候模拟表明，在 15.9 至 14.8、13.0 至 8.6 和 8.1 至 7.6 ka BP 确定的雨季可能与北大西洋（高纬度）强迫有关（例如，Heinrich Stadial 1、Younger Dryas 和 Bond 寒冷事件） . 未模拟 5.0 至 4.6、3.2 至 2.1 和 1.4 至 0.7 ka BP 的全新世冲积层，这意味着低纬度内部变率强迫（即 ENSO 制度转变）。这些结果有助于限制未来安第斯中部的水文气候变化，并有望从全球沙漠生态系统中的啮齿动物中部重建过去的气候。