Wolf Annabel, Ersek Vasile, Braun Tobias, French Amanda D, McGee David, Bernasconi Stefano M, Skiba Vanessa, Griffiths Michael L, Johnson Kathleen R, Fohlmeister Jens, Breitenbach Sebastian F M, Pausata Francesco S R, Tabor Clay R, Longman Jack, Roberts William H G, Chandan Deepak, Peltier W Richard, Salzmann Ulrich, Limbert Deborah, Trinh Hong Quan, Trinh Anh Duc
Department of Earth System Science, University of California, Irvine, CA, 92697, USA.
Department of Geography and Environmental Sciences, Northumbria University Newcastle, Newcastle-upon-Tyne, NE1 8ST, UK.
Nat Commun. 2023 Sep 14;14(1):5697. doi: 10.1038/s41467-023-41373-9.
The winter and summer monsoons in Southeast Asia are important but highly variable sources of rainfall. Current understanding of the winter monsoon is limited by conflicting proxy observations, resulting from the decoupling of regional atmospheric circulation patterns and local rainfall dynamics. These signals are difficult to decipher in paleoclimate reconstructions. Here, we present a winter monsoon speleothem record from Southeast Asia covering the Holocene and find that winter and summer rainfall changed synchronously, forced by changes in the Pacific and Indian Oceans. In contrast, regional atmospheric circulation shows an inverse relation between winter and summer controlled by seasonal insolation over the Northern Hemisphere. We show that disentangling the local and regional signal in paleoclimate reconstructions is crucial in understanding and projecting winter and summer monsoon variability in Southeast Asia.
东南亚的冬季风和夏季风是重要但高度可变的降雨来源。目前对冬季风的理解受到相互矛盾的代用观测数据的限制，这是由区域大气环流模式和当地降雨动态的解耦造成的。这些信号在古气候重建中很难解读。在这里，我们展示了一份涵盖全新世的东南亚冬季风洞穴石笋记录，发现冬季和夏季降雨同步变化，受太平洋和印度洋变化的驱动。相比之下，区域大气环流显示，受北半球季节性日照控制，冬季和夏季之间呈反比关系。我们表明，在古气候重建中区分局部和区域信号对于理解和预测东南亚冬季风和夏季风的变化至关重要。
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