Increased El Niño amplitude during the last deglacial warming
It is still unclear how El Niño Southern Oscillation (ENSO), the leading mode of global-scale interannual climate variability, will respond to global warming. The last deglaciation offers natural experimental conditions to observe the behavior of ENSO in a period of abrupt warming and sea level rise...
Main Authors: | , , , , , , , |
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Other Authors: | , , , , , , , , , , , , , , |
Format: | Report |
Language: | English |
Published: |
HAL CCSD
2022
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Subjects: | |
Online Access: | https://hal.science/hal-03813693 https://hal.science/hal-03813693/document https://hal.science/hal-03813693/file/Yseki_prepint_v1.pdf https://doi.org/10.21203/rs.3.rs-1303299/v1 |
Summary: | It is still unclear how El Niño Southern Oscillation (ENSO), the leading mode of global-scale interannual climate variability, will respond to global warming. The last deglaciation offers natural experimental conditions to observe the behavior of ENSO in a period of abrupt warming and sea level rise. Here we present a record of ENSO-related interannual variability of river discharge in Peru during the last deglaciation (17.3-13 kyr) and the Late Holocene (2.7-1.3 kyr), based on high-resolution records of Titanium concentration in marine sediments from the Peruvian margin (Callao, 12°S and Pisco 14°S). We find that the amplitude of ENSO events was 16 to 100 % larger during the last deglaciation compared to the Late Holocene, which supports the hypothesis that ENSO in the EP is strengthened by ice sheet meltwater discharge. A possible strengthening of ENSO in response to future ice sheet melting should be considered. |
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