2022-06-02 パデュー大学
＜関連情報＞
- https://www.purdue.edu/newsroom/releases/2022/Q2/salt-may-be-the-key-to-life-on-earth-and-beyond.html
- https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL095748
海洋の塩分濃度が気候に与える影響と地球の居住可能性への影響 The Effect of Ocean Salinity on Climate and Its Implications for Earth’s Habitability
Stephanie Olson,Malte F. Jansen,Dorian S. Abbot,Itay Halevy,Colin Goldblatt
Geophysical Research Letters Published: 24 May 2022
DOI:https://doi.org/10.1029/2021GL095748
Abstract
The influence of atmospheric composition on the climates of present-day and early Earth has been studied extensively, but the role of ocean composition has received less attention. We use the ROCKE-3D ocean-atmosphere general circulation model to investigate the response of Earth’s present-day and Archean climate system to low versus high ocean salinity. We find that saltier oceans yield warmer climates in large part due to changes in ocean dynamics. Increasing ocean salinity from 20 to 50 g/kg results in a 71% reduction in sea ice cover in our present-day Earth scenario. This same salinity change also halves the pCO2 threshold at which Snowball glaciation occurs in our Archean scenarios. In combination with higher levels of greenhouse gases such as CO2 and CH4, a saltier ocean may allow for a warm Archean Earth with only seasonal ice at the poles despite receiving ∼20% less energy from the Sun.
