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East Asian Winter Monsoon Variations and Their Links to Arctic Sea Ice During the Last Millennium, Inferred From Sea Surface Temperatures in the Okinawa Trough

Li, Dongling; Li, Tiegang; Jiang, Hui; Björck, Svante LU ; Seidenkrantz, Marit Solveig; Zhao, Meixun; Sha, Longbin and Knudsen, Karen Luise (2018) In Paleoceanography and Paleoclimatology 33(1). p.61-75
Abstract

The East Asian winter monsoon (EAWM) significantly impacts living conditions in a large part of Asia, and therefore, it is important to understand its major driving mechanisms. Winter sea surface temperature (SSTW) and circulation in the southern Okinawa Trough are today both primarily controlled by the EAWM. Here we present a new SSTW reconstruction for the last millennium based on a diatom record from sediment core MD05-2908, from the continental slope of the southern Okinawa Trough off northeastern Taiwan. Our reconstruction indicates that SSTW varied between 14.1 and 19.6°C over the past 1,000 years. Changes in SSTW in the southern Okinawa Trough correspond closely to the index of warm... (More)

The East Asian winter monsoon (EAWM) significantly impacts living conditions in a large part of Asia, and therefore, it is important to understand its major driving mechanisms. Winter sea surface temperature (SSTW) and circulation in the southern Okinawa Trough are today both primarily controlled by the EAWM. Here we present a new SSTW reconstruction for the last millennium based on a diatom record from sediment core MD05-2908, from the continental slope of the southern Okinawa Trough off northeastern Taiwan. Our reconstruction indicates that SSTW varied between 14.1 and 19.6°C over the past 1,000 years. Changes in SSTW in the southern Okinawa Trough correspond closely to the index of warm winters based on historical documents from the East Asian monsoon domain. This implies that our SSTW record can be used to reconstruct EAWM variability during the last millennium. Comparisons with the reconstructed winter Arctic Oscillation (AO, developed from historical snow anomaly events in Eastern Asia) and Arctic sea ice cover reveal a significant positive correlation between the EAWM and AO during the time interval from 1000–1400 Common Era (C.E.), coinciding with reduced sea ice cover. However, there is no significant correlation with increased sea ice cover during the interval from 1400 to 1700 C.E. This suggests that the reduction in Arctic sea ice may periodically have played a role in strengthening the relationship between the EAWM and the AO during the last millennium and that the current and future reduction in Arctic sea ice may have significant consequences for the EAWM.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arctic sea ice, East Asian winter monsoon, Last millennium, Sea surface temperature
in
Paleoceanography and Paleoclimatology
volume
33
issue
1
pages
15 pages
external identifiers
  • scopus:85042223273
DOI
10.1002/2016PA003082
language
English
LU publication?
yes
id
66561029-d03f-4bb6-a87d-3f5bddfd61c2
date added to LUP
2018-03-07 12:41:31
date last changed
2018-05-29 12:18:33
@article{66561029-d03f-4bb6-a87d-3f5bddfd61c2,
  abstract     = {<p>The East Asian winter monsoon (EAWM) significantly impacts living conditions in a large part of Asia, and therefore, it is important to understand its major driving mechanisms. Winter sea surface temperature (SST<sub>W</sub>) and circulation in the southern Okinawa Trough are today both primarily controlled by the EAWM. Here we present a new SST<sub>W</sub> reconstruction for the last millennium based on a diatom record from sediment core MD05-2908, from the continental slope of the southern Okinawa Trough off northeastern Taiwan. Our reconstruction indicates that SST<sub>W</sub> varied between 14.1 and 19.6°C over the past 1,000 years. Changes in SST<sub>W</sub> in the southern Okinawa Trough correspond closely to the index of warm winters based on historical documents from the East Asian monsoon domain. This implies that our SST<sub>W</sub> record can be used to reconstruct EAWM variability during the last millennium. Comparisons with the reconstructed winter Arctic Oscillation (AO, developed from historical snow anomaly events in Eastern Asia) and Arctic sea ice cover reveal a significant positive correlation between the EAWM and AO during the time interval from 1000–1400 Common Era (C.E.), coinciding with reduced sea ice cover. However, there is no significant correlation with increased sea ice cover during the interval from 1400 to 1700 C.E. This suggests that the reduction in Arctic sea ice may periodically have played a role in strengthening the relationship between the EAWM and the AO during the last millennium and that the current and future reduction in Arctic sea ice may have significant consequences for the EAWM.</p>},
  author       = {Li, Dongling and Li, Tiegang and Jiang, Hui and Björck, Svante and Seidenkrantz, Marit Solveig and Zhao, Meixun and Sha, Longbin and Knudsen, Karen Luise},
  keyword      = {Arctic sea ice,East Asian winter monsoon,Last millennium,Sea surface temperature},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {61--75},
  series       = {Paleoceanography and Paleoclimatology},
  title        = {East Asian Winter Monsoon Variations and Their Links to Arctic Sea Ice During the Last Millennium, Inferred From Sea Surface Temperatures in the Okinawa Trough},
  url          = {http://dx.doi.org/10.1002/2016PA003082},
  volume       = {33},
  year         = {2018},
}