Abstract
The great river systems originating from the Tibetan Plateau are pivotal for the wellbeing of more than half the global population. Our understanding of historical ranges and future changes in water availability for much of Southeast Asia is, however, limited by short observational records and complex environmental factors. Here we present annually resolved and absolutely dated tree ring-based streamflow reconstructions for the Mekong, Salween and Yarlung Tsangpo rivers since 1000 ce, which are supplemented by corresponding model projections until 2100 ce. We show a significant positive correlation between streamflow and dry season vegetation indices over the Indochinese Peninsula, revealing the importance of the Tibetan Water Tower for the functioning and productivity of ecological and societal systems in Southeast Asia. The streamflow variability is associated with low-frequency sea-surface temperature variability in the North Atlantic and North Pacific. We find that streamflow extremes coincide with distinct shifts in local populations that occurred during medieval times, including the occupation and subsequent collapse of Angkor Wat from the eleventh to the sixteenth century. Finally, our projections suggest that future streamflow changes will reach, or even exceed, historical ranges by the end of this century, posing unprecedented risks for Southeast Asia.
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Data availability
The streamflow reconstruction is downloaded from the Mendeley Data Repository Center (https://doi.org/10.17632/7km7vmk4f3.1). Palaeoclimate records for comparison in Fig. 2 were obtained from the National Centers for Environmental Information (https://www.ncei.noaa.gov/access/paleo-search/?dataTypeId=18). The CESM model data can be downloaded at https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.CESM_CAM5_LME.html, and the CMIP data can be downloaded at https://esgf-node.llnl.gov/search/cmip6/.
Code availability
The code to carry out the current analyses is available from the corresponding authors upon request.
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Acknowledgements
This work was supported by Basic Science Center for Tibetan Plateau Earth System (BSCTPES, NSFC project no. 41988101), the 2nd Scientific Expedition to the Qinghai-Tibet Plateau (2019QZKK010206), NSFC (91547115, 42261144687, 42075041) and Jiangsu Collaborative Innovation Center for Climate Change. J.E. and U.B. acknowledge the support of the ERC Advanced project entitled Monostar (AdG 882727).
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F.C., D.H. and F.H.C. conceived and designed the study, with input from all other authors. F.C. and W.M. wrote the original drafts. F.C., W.M., S.W., X.Z. and M.H. performed analyses and generated all figures. All authors contributed to the discussions, reviews and improvement of this paper.
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Chen, F., Man, W., Wang, S. et al. Southeast Asian ecological dependency on Tibetan Plateau streamflow over the last millennium. Nat. Geosci. 16, 1151–1158 (2023). https://doi.org/10.1038/s41561-023-01320-1
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DOI: https://doi.org/10.1038/s41561-023-01320-1
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