Abrupt change in tropical Pacific climate mean state during the Little Ice Age
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The mean state of the tropical Pacific ocean-atmosphere climate, in particular its east-west asymmetry, has profound consequences for regional climates and for the El Niño/Southern Oscillation variability. Here we present a new high-resolution paleohydrological record using the stable-hydrogen-isotopic composition of terrestrial-lipid biomarkers (δDwax) from a 1,400-year-old lake sedimentary sequence from northern Philippines. Results show a dramatic and abrupt increase in δDwax values around 1630 AD with sustained high values until around 1900 AD. We interpret this change as a shift to significantly drier conditions in the western tropical Pacific during the second half of the Little Ice Age as a result of a change in tropical Pacific mean state tied to zonal sea surface temperature (SST) gradients. Our findings highlight the prominent role of abrupt shifts in zonal SST gradients on multidecadal to multicentennial timescales in shaping the tropical Pacific hydrology of the last millennium, and demonstrate that a marked transition in the tropical Pacific mean state can occur within a period of a few decades.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 227 |
| Tidsskrift | Communications Earth and Environment |
| Vol/bind | 4 |
| Antal sider | 13 |
| ISSN | 2662-4435 |
| DOI | |
| Status | Udgivet - 2023 |
| Eksternt udgivet | Ja |
Bibliografisk note
Funding Information:
We thank the Philippine Bureau of Fisheries and Aquatic Resources and the Philippine Department of Environment and Natural Resources, as well as the Bulusan Volcano Natural Park staff, for permitting and facilitating our research at Bulusan Lake. We would also like to thank Professor Keith Bennett (University of St Andrews) and Philip Bartilet (Bulusan Volcano Natural Park) for fieldwork assistance, and Iris Van Der Veen (University of Potsdam) and Anne Thoisen (University of Aarhus) for laboratory assistance. For assistance with the figures, we thank Marwan Butrous. Finally, we thank Kei Yoshimura for providing access to isoGSM2 data. This work was supported by the Royal Geographical Society (Monica Cole Research Grant and Paddy Coker Postgraduate Research Award), Quaternary Research Association (New Research Worker’s Award), the Department of Zoology at the University of Oxford (Postgraduate Research and Training Grant), and Merton College (Graduate Research Expenses and Supplementary Travel Grants). Radiocarbon dating was funded by the Natural Environment Research Council. A.P. was supported by the Clarendon Fund. D.S. was supported by an Emmy-Noether grant of the DFG (SA-1889/1) and an ERC Consolidator grant (STEEPclim, Grant agreement no.: 647035).
Funding Information:
We thank the Philippine Bureau of Fisheries and Aquatic Resources and the Philippine Department of Environment and Natural Resources, as well as the Bulusan Volcano Natural Park staff, for permitting and facilitating our research at Bulusan Lake. We would also like to thank Professor Keith Bennett (University of St Andrews) and Philip Bartilet (Bulusan Volcano Natural Park) for fieldwork assistance, and Iris Van Der Veen (University of Potsdam) and Anne Thoisen (University of Aarhus) for laboratory assistance. For assistance with the figures, we thank Marwan Butrous. Finally, we thank Kei Yoshimura for providing access to isoGSM2 data. This work was supported by the Royal Geographical Society (Monica Cole Research Grant and Paddy Coker Postgraduate Research Award), Quaternary Research Association (New Research Worker’s Award), the Department of Zoology at the University of Oxford (Postgraduate Research and Training Grant), and Merton College (Graduate Research Expenses and Supplementary Travel Grants). Radiocarbon dating was funded by the Natural Environment Research Council. A.P. was supported by the Clarendon Fund. D.S. was supported by an Emmy-Noether grant of the DFG (SA-1889/1) and an ERC Consolidator grant (STEEPclim, Grant agreement no.: 647035).
Publisher Copyright:
© 2023, The Author(s).
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