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Earth and Space Sciences · 术语表

什么是 Eustasy, relative sea level？

又称： eustasy · relative sea level

Definition 23.11 University Earth and Space Sciences — Year 1 · 第 23 章 — Diagenesis and Sedimentary Basins

Eustasy is the change of the level of the world ocean measured relative to a fixed reference, the centre of the Earth, caused by a change in the volume of water in the ocean or in the volume of the ocean basins; it is the same everywhere. The relative sea level at a place is the height of the sea surface above a datum attached to the basement there; it changes by eustasy and by the vertical motion of the ground.

Accommodation at one place at two times (schematic). Between t_1 and t_2 sea level rises by E = e_2 - e_1 above the fixed reference and the basement subsides by S: the relative sea level R grows by E + S, the accommodation created, which is shared between more sediment (T_2 > T_1) and a change of water depth (here a slight shallowing, W_2 < W_1). — Accommodation at one place at two times (schematic). Between $t_1$ and $t_2$ sea level rises by $\Delta E = e_2 - e_1$ above the fixed reference and the basement subsides by $S$ : the relative sea level $R$ grows by $\Delta E + S$ , the accommodation created, which is shared between more sediment ( $T_2 > T_1$ ) and a change of water depth (here a slight shallowing, $W_2 < W_1$ ).

Global sea level relative to today from the stack of Spratt and Lisiecki (2016): the first principal component of five reconstructions from deep-sea cores over 800\,000 years (a) and of seven over the last 140\,000 (b), with its one-standard-deviation band. The lowest value of the stack, -130\, m at 24\, ka, lies within that band of the -134\, m found from former shorelines (dot); the last interglacial stands about 3\, m above today at 121\, ka. Data: NOAA NCEI World Data Service for Paleoclimatology. — Global sea level relative to today from the stack of Spratt and Lisiecki (2016): the first principal component of five reconstructions from deep-sea cores over $800\,000$ years (a) and of seven over the last $140\,000$ (b), with its one-standard-deviation band. The lowest value of the stack, $-130\,\mathrm{m}$ at $24\,\mathrm{ka}$ , lies within that band of the $-134\,\mathrm{m}$ found from former shorelines (dot); the last interglacial stands about $3\,\mathrm{m}$ above today at $121\,\mathrm{ka}$ . Data: NOAA NCEI World Data Service for Paleoclimatology.

Global sea level relative to today from the stack of Spratt and Lisiecki (2016): the first principal component of five reconstructions from deep-sea cores over 800\,000 years (a) and of seven over the last 140\,000 (b), with its one-standard-deviation band. The lowest value of the stack, -130\, m at 24\, ka, lies within that band of the -134\, m found from former shorelines (dot); the last interglacial stands about 3\, m above today at 121\, ka. Data: NOAA NCEI World Data Service for Paleoclimatology. — Global sea level relative to today from the stack of Spratt and Lisiecki (2016): the first principal component of five reconstructions from deep-sea cores over $800\,000$ years (a) and of seven over the last $140\,000$ (b), with its one-standard-deviation band. The lowest value of the stack, $-130\,\mathrm{m}$ at $24\,\mathrm{ka}$ , lies within that band of the $-134\,\mathrm{m}$ found from former shorelines (dot); the last interglacial stands about $3\,\mathrm{m}$ above today at $121\,\mathrm{ka}$ . Data: NOAA NCEI World Data Service for Paleoclimatology.

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