Abrupt change in tropical Pacific climate mean state during the Little Ice Age
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Abrupt change in tropical Pacific climate mean state during the Little Ice Age. / Prohaska, Ana; Seddon, Alistair W. R.; Meese, Bernd; Willis, Katherine J.; Chiang, John C. H.; Sachse, Dirk.
I: Communications Earth and Environment, Bind 4, 227, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Abrupt change in tropical Pacific climate mean state during the Little Ice Age
AU - Prohaska, Ana
AU - Seddon, Alistair W. R.
AU - Meese, Bernd
AU - Willis, Katherine J.
AU - Chiang, John C. H.
AU - Sachse, Dirk
N1 - Publisher Copyright: © 2023, The Author(s).
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
U2 - 10.1038/s43247-023-00882-7
DO - 10.1038/s43247-023-00882-7
M3 - Journal article
AN - SCOPUS:85163825820
VL - 4
JO - Communications Earth and Environment
JF - Communications Earth and Environment
SN - 2662-4435
M1 - 227
ER -
ID: 371558195