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Ocean Level Changes: Natural Patterns or Human Impact?

Explore the natural and human factors influencing ocean level changes over time, from glacial cycles to human activity. Learn about the earth's ocean level history and the gradual increase observed. Dive into the interplay of natural forces such as glacial melt, volcanic input, and anthropogenic influences that shape our oceans. Gain insights into past sea level variations and the ongoing rise, with a focus on depositional facies and wave cut terraces.

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Ocean Level Changes: Natural Patterns or Human Impact?

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  1. Changes in Ocean Level: Natural or Not? Christine Gammans Patrick Loury

  2. Natural Factors influencing Sea Level:  Amount of glacial ice (Milankovich cycles) Thermal expansion/contraction of ocean water (surface temperature) Tectonics Isostacy Tidal Forces  Ocean level is constantly changing in response to these factors Ocean Level: Natural State and Rates of Change

  3. Ocean Level: Natural State and Rates of Change • At the Last Glacial Maximum (20Ka), Sea Level was 125m lower than today • Average sea level rise since LGM: 3mm/year • In previous interglacial periods, sea level was 3-20m higher than at present time • depositional facies and wave cut terraces

  4. Sea Level Rise: 1.7 ± 0.13 mm/yr Ocean Level: Increasing Over Time

  5. Why? • Natural Glacial Melt • Volcanic Input (Very Small) • Human Activity

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