期刊
SCIENCE
卷 350, 期 6267, 页码 1537-1541出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac9937
关键词
-
资金
- Lamont-Doherty Earth Observatory Climate Center
- Professional Staff Congress-City University of New York
- College of Staten Island
- NSF [OCE-1103482]
Tropical Pacific Ocean dynamics during the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) are poorly characterized due to a lack of evidence from the eastern equatorial Pacific. We reconstructed sea surface temperature, El Nino-Southern Oscillation (ENSO) activity, and the tropical Pacific zonal gradient for the past millennium from Galapagos ocean sediments. We document a mid-millennium shift (MMS) in ocean-atmosphere circulation around 1500-1650 CE, from a state with dampened ENSO and strong zonal gradient to one with amplified ENSO and weak gradient. The MMS coincided with the deepest LIA cooling and was probably caused by a southward shift of the intertropical convergence zone. The peak of the MCA (900-1150 CE) was a warm period in the eastern Pacific, contradicting the paradigm of a persistent La Nina pattern.
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