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A 2007 Science study found that deep-sea warming preceded the rise in atmospheric carbon dioxide and tropical surface-ocean warming near the start of the last deglaciation. The authors proposed that changes in austral-spring sunlight and sea-ice feedbacks helped initiate this early warming. Their findings describe one part of the ice age’s retreat—not a complete, uncontested explanation for how it ended.
What the scientists found
Lowell Stott, Axel Timmermann, and Robert Thunell reported that deep-sea temperatures rose by about 2°C between 19,000 and 17,000 years before present. In their reconstruction, that warming led the increase in atmospheric CO2 and the warming of the tropical surface ocean by approximately 1,000 years.
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The sequence matters: it suggests that the initial deep-ocean warming did not result from rising CO2. The authors instead identified increasing austral-spring insolation—sunlight reaching the Southern Hemisphere during its spring—together with sea-ice albedo feedbacks as key factors in the early warming.
How the study reconstructed the sequence
The researchers analyzed a marine sediment core from the western tropical Pacific. They established its chronology using radiocarbon dating and examined stable-isotope and magnesium/calcium records from benthic and planktonic foraminifera, microscopic organisms that preserve evidence of past ocean conditions.
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Benthic foraminifera live on or near the seafloor; planktonic foraminifera live in the water column. Comparing their records helped the team reconstruct changes in deep-sea and surface-ocean conditions over time. The paper was published in Science in 2007 as “Southern Hemisphere and deep-sea warming led deglacial atmospheric CO2 rise and tropical warming.” See the paper’s abstract and record.
How warming, sea ice, and CO2 may have interacted
The proposed explanation distinguishes an early trigger from a later amplifier. In the authors’ interpretation, changing austral-spring sunlight and sea-ice albedo feedbacks contributed to early Southern Hemisphere and deep-water warming. The deep-sea temperature rise then preceded the increase in atmospheric CO2 and tropical surface-ocean warming.
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Contemporaneous reporting said the warming apparently originated in the Antarctic Ocean and noted that melting Antarctic sea ice coincided with increased springtime solar radiation over Antarctica. That geographic origin is an interpretation, not a direct observation of the entire process from a single global record. Chemistry World also reported the possibility that later ocean ventilation released CO2, amplifying deglaciation; that final step is expert interpretation in the report, not a sole mechanism established by the paper’s abstract.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallRobert Mulvaney of the British Antarctic Survey summarized the long-timescale interpretation in a comment reported by Chemistry World: “This paper confirms what we already suspected, that climate at the very long timescale is driven by temperature increases brought about by the orbit of the Earth around the Sun which warms up the deep ocean and that this in turn releases carbon dioxide into the atmosphere which amplifies the temperature increase.” This was a contemporaneous expert comment, not a quotation from the Science paper. Read the Chemistry World report.
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What the findings do—and do not—explain
The study provides evidence about the timing of changes and a proposed driver during deglaciation, based on one marine-core reconstruction. It does not establish a single cause for every regional change or supply a global estimate for the overall duration or magnitude of the ice age’s ending. Nor does this ancient sequence, by itself, predict near-term climate change.
Dick Kroon, identified in the Chemistry World report as Regius Professor of Geology at the University of Edinburgh, described the study as important for understanding glacial-to-interglacial change, “but not necessarily for driving climate change in the near future.”
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