24 Aug 2023
 | 24 Aug 2023
Status: this preprint is currently under review for the journal ESSD.

An 800-kyr planktonic 𝜹18O stack for the West Pacific Warm Pool

Christen L. Bowman, Devin S. Rand, Lorraine E. Lisiecki, and Sanatha C. Bova

Abstract. The West Pacific Warm Pool (WPWP) exhibits different glacial-interglacial climate variability than high latitudes, and its sea surface temperatures are thought to respond primarily to changes in greenhouse gas concentrations. To better characterize the orbital scale climate response of the WPWP, we constructed a planktonic 𝛿18O stack (average) of 11 previously published WPWP records of the last 800 kyr, available at (Bowman et al., 2023), using new Bayesian alignment and stacking software BIGMACS. Similarities in stack uncertainty between the WPWP planktonic 𝛿18O stack and benthic 𝛿18O stacks also constructed using BIGMACS demonstrate that the software performs similarly well when aligning regional planktonic or benthic 𝛿18O data. Sixty-seven radiocarbon dates from four of the WPWP cores suggest that WPWP planktonic 𝛿18O change is nearly synchronous with global benthic 𝛿18O during the last glacial termination. However, the WPWP planktonic 𝛿18O stack exhibits less glacial/interglacial amplitude and less spectral power at all orbital frequencies than benthic 𝛿18O stacks. We assert that the WPWP planktonic 𝛿18O stack provides a useful representation of orbital-scale regional climate response and a regional alignment target, particularly for the higher resolution 0–450 ka portion of our stack.

Christen L. Bowman et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2023-335', Anonymous Referee #1, 31 Aug 2023
  • RC2: 'Comment on essd-2023-335', Manfred Mudelsee, 21 Sep 2023
  • RC3: 'Updated RC by Manfred Mudelsee (own typos corrected) --- Comment on essd-2023-335', Manfred Mudelsee, 21 Sep 2023
  • RC4: 'Comment on essd-2023-335', Anonymous Referee #3, 22 Sep 2023
  • RC5: 'Comment on essd-2023-335', Anonymous Referee #4, 27 Sep 2023

Christen L. Bowman et al.

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An 800-kyr planktonic 𝜹18O stack for the West Pacific Warm Pool C. L. Bowman, D. S. Rand, L. E. Lisiecki, and S. C. Bova

Christen L. Bowman et al.


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Short summary
We estimate an average (stack) of West Pacific Warm Pool (WPWP) sea surface climate records over the last 800 kyr from eleven ocean sediment cores. To better understand glacial-interglacial differences between the tropical WPWP and high-latitude climate change, we compare our WPWP stack to global and North Atlantic deep ocean stacks. Although we see similar timing in glacial-interglacial change between the stacks, the WPWP exhibits less amplitude of change.