Expedition 383 Prospectus: Dynamics of the Pacific Antarctic Circumpolar Current (DYNAPACC)

Lamy, Frank; Winckler, Gisela; Zarikian, C.A. Alvarez

doi:10.14379/iodp.sp.383.2018

Cited by 2 publications

(10 citation statements)

References 87 publications

(153 reference statements)

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“…After consultation and guidance from the EPSP in September 2018, all 10 pending proposed sites in the Scientific Prospectus (Lamy et al 2018) were approved as requested, including five sites along the Chilean margin (CHI-1C [primary], CHI-5A, CHI-6A, CHI-7A, and CHI-8A), one site in the eastern South Pacific (ESP-2A), and four sites in the central South Pacific Ocean (CSP-4A, CSP-5A, CSP-6A, and CSP-7A [primary]). Table T1 shows all primary and alternate sites with their locations, approved penetration depths, anticipated lithologies, and scientific objectives.…”

Section: Site Evaluation By the Environmental Protection And Safety Pmentioning

confidence: 99%

“…The sites are located at latitudes and water depths where sediments will allow the application of a wide range of siliciclastic, carbonate, and opal-based proxies for reconstructing surface to deep-ocean variations and their relation to atmosphere and cryosphere changes with unprecedented stratigraphic detail. For details, see the original Expedition 383 Scientific Prospectus (Lamy et al, 2018).…”

Section: Operations Plan/drilling Strategymentioning

confidence: 99%

“…This addendum to the International Ocean Discovery Program (IODP) Expedition 383 Scientific Prospectus (Dynamics of the Pacific Antarctic Circumpolar Current; Lamy et al, 2018) addresses the results of the safety review of 10 new proposed drill sites by the IODP Environmental Protection and Safety Panel (EPSP) on 4-6 September 2018 and a change to the operations plan and the end port call for Expedition 383.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, at the time of publication of this addendum, the expedition is scheduled to start and end in Punta Arenas, Chile. The dates of the expedition remain unchanged from the original Expedition 383 Scientific Prospectus (Lamy et al, 2018), from 20 May to 20 July 2019. The change in port reduces the distance and hence the transit time between the last drill site in the central South Pacific and the port in Chile, providing ~3 additional days for scientific drilling operations.…”

Section: Introductionmentioning

confidence: 99%

“…The change in port reduces the distance and hence the transit time between the last drill site in the central South Pacific and the port in Chile, providing ~3 additional days for scientific drilling operations. For that reason, a new proposed primary site (CSP-7A) in the central South Pacific has been added to the original operations plan from Lamy et al (2018), bringing the total number of primary sites planned for Expedition 383 to seven ( Figures F1, F2, F3, F4).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Expedition 383 Scientific Prospectus Addendum: Dynamics of the Pacific Circumpolar Current (DYNAPACC)

Lamy¹,

Winckler²,

Zarikian³

2018

Self Cite

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Section: Site Evaluation By the Environmental Protection And Safety Pmentioning

confidence: 99%

Section: Operations Plan/drilling Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Expedition 383 Scientific Prospectus Addendum: Dynamics of the Pacific Circumpolar Current (DYNAPACC)

Lamy¹,

Winckler²,

Zarikian³

2018

Self Cite

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Five million years of Antarctic Circumpolar Current strength variability

Lamy,

Winckler,

Arz

et al. 2024

Nature

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The Antarctic Circumpolar Current (ACC) represents the world’s largest ocean-current system and affects global ocean circulation, climate and Antarctic ice-sheet stability1–3. Today, ACC dynamics are controlled by atmospheric forcing, oceanic density gradients and eddy activity4. Whereas palaeoceanographic reconstructions exhibit regional heterogeneity in ACC position and strength over Pleistocene glacial–interglacial cycles5–8, the long-term evolution of the ACC is poorly known. Here we document changes in ACC strength from sediment cores in the Pacific Southern Ocean. We find no linear long-term trend in ACC flow since 5.3 million years ago (Ma), in contrast to global cooling9 and increasing global ice volume10. Instead, we observe a reversal on a million-year timescale, from increasing ACC strength during Pliocene global cooling to a subsequent decrease with further Early Pleistocene cooling. This shift in the ACC regime coincided with a Southern Ocean reconfiguration that altered the sensitivity of the ACC to atmospheric and oceanic forcings11–13. We find ACC strength changes to be closely linked to 400,000-year eccentricity cycles, probably originating from modulation of precessional changes in the South Pacific jet stream linked to tropical Pacific temperature variability14. A persistent link between weaker ACC flow, equatorward-shifted opal deposition and reduced atmospheric CO2 during glacial periods first emerged during the Mid-Pleistocene Transition (MPT). The strongest ACC flow occurred during warmer-than-present intervals of the Plio-Pleistocene, providing evidence of potentially increasing ACC flow with future climate warming.

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Expedition 383 Prospectus: Dynamics of the Pacific Antarctic Circumpolar Current (DYNAPACC)

Cited by 2 publications

References 87 publications

Expedition 383 Scientific Prospectus Addendum: Dynamics of the Pacific Circumpolar Current (DYNAPACC)

Expedition 383 Scientific Prospectus Addendum: Dynamics of the Pacific Circumpolar Current (DYNAPACC)

Five million years of Antarctic Circumpolar Current strength variability

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