{"id":340872,"date":"2024-08-27T17:12:14","date_gmt":"2024-08-27T15:12:14","guid":{"rendered":"https:\/\/climatescience.press\/?p=340872"},"modified":"2024-08-27T17:12:17","modified_gmt":"2024-08-27T15:12:17","slug":"study-sea-levels-rose-4-7-centimeters-per-year-8200-years-ago-30-times-faster-than-modern-rates","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=340872","title":{"rendered":"\u00a0Study: Sea Levels Rose 4.7 Centimeters Per Year 8200 Years Ago \u2013 30 Times Faster Than Modern Rates"},"content":{"rendered":"\n
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From NoTricksZone<\/a><\/p>\n\n\n\n

By\u00a0Kenneth Richard<\/a><\/em><\/p>\n\n\n\n

The modern rate of sea level rise is not even close veering outside the range of natural variability.<\/strong><\/p>\n\n\n\n

A\u00a0new study<\/a><\/strong>\u00a0reminds us that, 8200 years ago, near-global sea levels rose 6.5 meters in a span of just 140 years. This is 470 centimeters per century, 4.7 centimeters per year, during a period when CO2 levels were alleged to be a \u201csafe\u201d and stagnant 260 ppm.<\/p>\n\n\n\n

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Image Source:\u00a0Nunn et al., 2024<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

To put this change rate in perspective, global sea levels rose at a rate of 1.56 millimeters per year from 1900 to 2018, including 1.5 mm per year rate during the more recent period from 1958-2014 (Frederikse et al., 2020<\/a><\/strong>, Frederikse et al., 2018<\/a><\/strong>). This is just under 16 centimeters per century or sixteen tenths of a centimeter (0.16 cm) per year.<\/p>\n\n\n\n

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Image Source:\u00a0Frederikse et al., 2020<\/a><\/strong>\u00a0and\u00a0Frederikse et al., 2018<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

The net melt of the Greenland ice sheet (GIS) is thought to have been the largest contributor to sea level rise in recent decades. But, to put the GIS change in context, the entire ice sheet melt contribution to sea level rise was just 1.2\u00a0total<\/em>\u00a0centimeters from 1992-2020 (Simonsen et al., 2021<\/a><\/strong>).<\/p>\n\n\n\n

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Image Source:\u00a0Simonsen et al., 2021<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n

The Earth\u2019s natural range of sea level rise rates, periodically reaching 4.7 cm per year, is thus 30 times greater in magnitude than the modern period\u2019s (1900-2018) \u201canthropogenic\u201d rate, which is 0.156 cm per year.<\/p>\n\n\n\n

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