Dipole patterns in tropical precipitation were pervasive across landmasses throughout Marine Isotope Stage 5

Type Article
Date 2021-12
Language English
Author(s) Nilsson-Kerr KatrinaORCID1, Anand PallaviORCID1, Holden Philip B.1, Clemens Steven C.2, Leng Melanie J.3, 4
Affiliation(s) 1 : Faculty of STEM, School of Environment, Earth and Ecosystem Sciences, The Open University, Milton Keynes, UK
2 : Department of Geological Sciences, Brown University, Providence, RI, USA
3 : National Environmental Isotope Facility, British Geological Survey, Nottingham, UK
4 : School of Biosciences, University of Nottingham, Loughborough, UK
Source Communications Earth & Environment (2662-4435) (Springer Science and Business Media LLC), 2021-12 , Vol. 2 , N. 1 , P. 64 (9p.)
DOI 10.1038/s43247-021-00133-7
Keyword(s) Palaeoceanography, Palaeoclimate
Abstract

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.

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