North Atlantic cooling triggered a zonal mode over the Indian Ocean during Heinrich Stadial 1
| Type | Article | ||||||||||||
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| Date | 2023-01 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Du Xiaojing 1, 2, Russell James M.1, 2, Liu Zhengyu3, Otto-Bliesner Bette L.4, Oppo Delia W.5, Mohtadi Mahyar6, Zhu Chenyu7, Galy Valier V.8, Schefuß Enno6, Yan Yan9, Rosenthal Yair10, Dubois Nathalie11, 12, Arbuszewski Jennifer5, Gao Yu13 |
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| Affiliation(s) | 1 : Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA. 2 : Institute at Brown for Environment and Society, Brown University, Providence, RI, USA. 3 : Atmospheric Science Program, Department of Geography, The Ohio State University, Columbus, OH, USA. 4 : Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, USA. 5 : Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. 6 : MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany. 7 : Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao, China. 8 : Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. 9 : State Key Laboratory of Isotope Geochemistry, CAS Center for Excellence in Deep Earth Science, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China. 10 : Department of Marine and Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers, State University of New Jersey, New Brunswick, NJ, USA. 11 : Department of Surface Waters Research and Management, Eawag, Dübendorf, Switzerland. 12 : Department of Earth Sciences, ETH Zürich, Zürich, Switzerland. 13 : Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China. |
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| Source | Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2023-01 , Vol. 9 , N. 1 , P. eadd4909 (9p.) | ||||||||||||
| DOI | 10.1126/sciadv.add4909 | ||||||||||||
| WOS© Times Cited | 4 | ||||||||||||
| Abstract | Abrupt changes in the Atlantic meridional overturning circulation (AMOC) are thought to affect tropical hydroclimate through adjustment of the latitudinal position of the intertropical convergence zone (ITCZ). Heinrich Stadial 1 (HS1) involves the largest AMOC reduction in recent geological time; however, over the tropical Indian Ocean (IO), proxy records suggest zonal anomalies featuring intense, widespread drought in tropical East Africa versus generally wet but heterogeneous conditions in the Maritime Continent. Here, we synthesize proxy data and an isotope-enabled transient deglacial simulation and show that the southward ITCZ shift over the eastern IO during HS1 strengthens IO Walker circulation, triggering an east-west precipitation dipole across the basin. This dipole reverses the zonal precipitation anomalies caused by the exposed Sunda and Sahul shelves due to glacial lower sea level. Our study illustrates how zonal modes of atmosphere-ocean circulation can amplify or reverse global climate anomalies, highlighting their importance for future climate change. |
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