Earth’s Oceans Used To Be 20-25°C Warmer Than They Are Today
By Kenneth Richard on 1. October 2020
Today’s global ocean temperatures hover around 15°C on average. About 400 to 500 million years ago, Earth’s ocean temperatures averaged 35-40°C and atmospheric CO2 concentrations were “5-10x higher than present day values†(Henke et al., 2018). During this period, the marine biosphere thrived (Voosen et al., 2019).
Image Source: Henke et al., 2018
Image Source: Voosen et al., 2019 and press release
During the last 5.4 million years, CO2 has varied between 180 and 500 ppm (Fletcher et al., 2019). During the Pliocene (5.4 to 2.5 million years ago), Arctic temperatures were said to have been 22°C warmer than today (Fletcher et al., 2017) and tropical ocean temperatures were 3-6°C warmer than present (Wycech et al., 2020).
https://notrickszone.com/2020/10/01/earths-oceans-used-to-be-20-25c-warmer-than-they-are-today/
