The paper follows on the heels of another paper published last week finding Indian Summer Monsoon failures "synchronize well with abrupt changes in solar activity," which may represent another potential solar amplification mechanism by which small changes in solar activity are amplified to large-scale effects on climate.
Initiation of East Asia monsoon failure at the climate transition from the Medieval Climate Anomaly to the Little Ice Age
- We estimated SST and SSS of the East/Japan Sea over the last 1300 years.
- East Asia monsoon variability has been reconstructed over the period.
- A strengthened summer monsoon occurred for the MCA at time of negative PDO.
- Asian monsoon failure started at the end of the MCA and extended to the LIA.
We have reconstructed decadally-resolved continuous sea surface temperature and seawater δ18O (hence salinity) records over the last 1300 years from alkenone and planktonic foraminiferal oxygen isotope ratio analyses of the East Sea/Japan Sea marine sediments to investigate East Asia monsoon variability. Comparisons of the records with other paleoclimate records indicate a possible connection between changes in the mid-latitude East Asia monsoon and Pacific Decadal Oscillation (PDO) over this period. The results show that during the Medieval Climate Anomaly when the PDO index was negative, East Asia was characterized by surface warming with a strengthened summer monsoon. Summer monsoon-related precipitation increased and pluvials possibly dominated in the region at that time. Onset of Asia monsoon failure and severe drought occurred at the end of the MCA and extended to the Little Ice Age when the PDO became positive.
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