Southern Ocean Paleoclimate Simulations of Tectonic Gateway Effects on Antarctic Cooling

High-resolution ocean simulations with detailed paleobathymetry demonstrate the role of tectonic gateway opening in Southern Ocean climate change around 34 million years ago. The dataset, hosted by the Australian Ocean Data Network, shows that gateway subsidence below 300 meters can cause Antarctic surface water cooling of 2–4°C on average, up to 5°C. These results are consistent with available proxy data and suggest tectonic changes are crucial for constraining long-term climate sensitivity to CO2.

Use Cases

• Validate paleoclimate proxy records based on simulated Antarctic surface temperature changes.
• Study the relationship between ocean gyre strength and heat transport based on gateway depth configurations.
• Model the climatic impact of tectonic changes on the Antarctic Circumpolar Current during the Cenozoic transition.
• Analyze the sensitivity of Southern Ocean circulation patterns to paleobathymetry.

Strengths

• Simulations are high-resolution and incorporate detailed paleobathymetry.
• Results quantify a dramatic cooling effect of 2–4°C on average, with localized cooling up to 5°C.
• Findings are consistent with available proxy data, supporting model validity.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data files are in PNG and HTML formats, which may not be standard for quantitative analysis.

Provenance

Source

Australian Ocean Data Network via data_gov_au.

Collection Method

High-resolution ocean simulations with detailed paleobathymetry.

Time Range

Focuses on the Cenozoic Greenhouse-Icehouse transition, ~34 million years ago.

Freshness

Last updated 2026-07-10 01:12:30.115720; freshness should be verified.

Geography

Southern Ocean, specifically the Tasmanian and Drake gateways and Antarctic coastal waters.