Millennial meridional dynamics of the Indo-Pacific Warm Pool during the last termination

L. Lo, C. C. Shen, K. Y. Wei, G. S. Burr, H. S. Mii, M. T. Chen, S. Y. Lee, M. C. Tsai

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Abstract

To develop an in-depth understanding of the natural dynamics of the Indo-Pacific Warm Pool (IPWP) during the last deglaciation, stacked north- (N-) and south-IPWP (S-IPWP) thermal and hydrological records over the past 23-10.5 ka were built using planktonic foraminiferal geochemistry data from a new core, MD05-2925 (9.3° S, 151.5° E water depth 1661 m) in the Solomon Sea and eleven previous sites. Ice-volume-corrected seawater δ18O (δ18OSW-IVC) stacks show that S-IPWP δ18OSW-IVC values are indistinguishable from their northern counterparts through glacial time. The N-IPWP SST (sea surface temperature) stacked record features an increasing trend of 0.5 °C kag-1 since 18 ka. Its S-IPWP counterpart shows an earlier onset of temperature increase at 19 ka and a strong teleconnection to high-latitude climate in the Southern Hemisphere. Meridional SST gradients between the N- and S-IPWP were 1-1.5 °C during the Bølling/Allerød period and 1 °C during both Heinrich event 1 and the Younger Dryas, due to a warmer S-IPWP. A warm S-IPWP during the cold events could weaken the southern hemispheric branch of the Hadley cell and reduce precipitation in the Asian monsoon region.

Original languageEnglish
Pages (from-to)2253-2261
Number of pages9
JournalClimate of the Past
Volume10
Issue number6
DOIs
Publication statusPublished - 2014 Dec 23

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ASJC Scopus subject areas

  • Global and Planetary Change
  • Stratigraphy
  • Palaeontology

Cite this

Lo, L., Shen, C. C., Wei, K. Y., Burr, G. S., Mii, H. S., Chen, M. T., Lee, S. Y., & Tsai, M. C. (2014). Millennial meridional dynamics of the Indo-Pacific Warm Pool during the last termination. Climate of the Past, 10(6), 2253-2261. https://doi.org/10.5194/cp-10-2253-2014