Dipole patterns in tropical precipitation were pervasive across landmasses throughout Marine Isotope Stage 5
Dipole patterns in tropical precipitation were pervasive across landmasses throughout Marine Isotope Stage 5
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DOI：
10.1038/s43247-021-00133-7
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发表时间：
2021-03
影响因子：
7.9
通讯作者：
K. Nilsson-Kerr;P. Anand;P. Holden;S. Clemens;M. Leng
中科院分区：
文献类型：
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作者：
K. Nilsson-Kerr;P. Anand;P. Holden;S. Clemens;M. Leng
地球上的大部分雨水落在热带地区，通常是高度季节性的季风性降雨，这被认为与热带辐合带的半球间迁移有关，以响应日照的季节性循环。然而，对过去地质时期热带降雨行为的描述却很贫乏。在这里，我们将来自六个大尺度热带地区的新的和现有的水文气候记录与完全独立的基于模式的降雨重建结合起来，这些降雨重建跨越了13万至7万年前持续变暖和随后的气候变冷的最后间隔（海洋同位素阶段5）。我们的数据模型方法揭示了响应气候变化的大规模非均匀降雨模式。我们注意到普遍的偶极子样热带降水模式，以及整个海洋同位素阶段的降水位置与全新世记录的不同。这些降雨模式不能仅仅归因于热带辐合带的经向变化。
Most of Earth’s rain falls in the tropics, often in highly seasonal monsoon rains, which are thought to be coupled to the inter-hemispheric migrations of the Inter-Tropical Convergence Zone in response to the seasonal cycle of insolation. Yet characterization of tropical rainfall behaviour in the geologic past is poor. Here we combine new and existing hydroclimate records from six large-scale tropical regions with fully independent model-based rainfall reconstructions across the last interval of sustained warmth and ensuing climate cooling between 130 to 70 thousand years ago (Marine Isotope Stage 5). Our data-model approach reveals large-scale heterogeneous rainfall patterns in response to changes in climate. We note pervasive dipole-like tropical precipitation patterns, as well as different loci of precipitation throughout Marine Isotope Stage 5 than recorded in the Holocene. These rainfall patterns cannot be solely attributed to meridional shifts in the Inter-Tropical Convergence Zone.