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Earth and Space Sciences · 术语表

什么是 Ice-volume effect？

Definition 24.3 University Earth and Space Sciences — Year 2 · 第 24 章 — Climate Archives and Proxies

The ice-volume effect is the change of the oxygen-isotope composition of the whole ocean caused by the growth or decay of the continental ice sheets, which store water depleted in ¹⁸O; it shifts the $\delta^{18}$ O of every carbonate formed in the sea by the same amount, whatever the temperature.

The ice-volume effect (schematic, not to scale): the vapour that feeds the ice sheets is depleted in 18O, so storing 130\, m of sea level as ice of 18 O = -40 per mil leaves the ocean 1.46 per mil heavier (). Values in per mil, VSMOW. — The ice-volume effect (schematic, not to scale): the vapour that feeds the ice sheets is depleted in ¹⁸O, so storing $130\,\mathrm{m}$ of sea level as ice of $\delta^{18}\mathrm{O} = -40$ per mil leaves the ocean $1.46$ per mil heavier (Proposition 24.4). Values in per mil, VSMOW.

The ice-volume effect from the mass balance of , for three compositions of the ice (per mil, VSMOW); grey band: the sea-level fall of the Last Glacial Maximum, 125 to 134\, m; square: the change measured in sediment pore waters, 1.0 ± 0.1 per mil, placed at 130\, m; dashed: the change of the benthic stack between today and the Last Glacial Maximum. — The ice-volume effect from the mass balance of Proposition 24.4, for three compositions of the ice (per mil, VSMOW); grey band: the sea-level fall of the Last Glacial Maximum, 125 to $134\,\mathrm{m}$ ; square: the change measured in sediment pore waters, $1.0 \pm 0.1$ per mil, placed at $130\,\mathrm{m}$ ; dashed: the change of the benthic stack between today and the Last Glacial Maximum.

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