Evolution of tropical land temperature across the last glacial termination
Metadatos
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Nature
Fecha
2022-09-02Referencia bibliográfica
Løland, M.H... [et al.]. Evolution of tropical land temperature across the last glacial termination. Nat Commun 13, 5158 (2022). [https://doi.org/10.1038/s41467-022-32712-3]
Patrocinador
Research Council of Norway; European Commission 262353/F20 European Research Council (ERC) European Commission 101001957; National Science Foundation (NSF) 0645291; Juan de la Cierva Fellowship IJC2019-040065-IResumen
The tropicalWest Pacific hosts the warmest part of the surface ocean and has a
considerable impact on the global climate system. Reconstructions of past
temperature in this region can elucidate climate connections between the
tropics and poles and the sensitivity of tropical temperature to greenhouse
forcing. However, existing data are equivocal and reliable information from
terrestrial archives is particularly sparse. Here we constrain themagnitude and
timing of land temperature change in the tropical West Pacific across the last
deglaciation using an exceptionally precise paleothermometer applied to a
well-dated stalagmite from Northern Borneo. We show that the cave temperature
increased by 4.4 ± 0.3 °C (2 SEM) from the Last Glacial Maximum to
the Holocene, amounting to 3.6 ± 0.3 °C (2 SEM) when correcting for sea-level
induced cave altitude change. The warming closely follows atmospheric CO2
and Southern Hemisphere warming. This contrasts with hydroclimate, as
reflected by dripwater δ18O, which responds to Northern Hemisphere cooling
events in the form of prominent drying, while temperature was rising. Our
results thus show a close response of tropical temperature to greenhouse
forcing, independent of shifts in the tropical circulation patterns.