Hydrogen-nitrogen greenhouse warming in Earth's early atmosphere.

摘要: Understanding how Earth has sustained surface liquid water throughout its history remains a key challenge, given that the Sun’s luminosity was much lower in past. Here we show with an atmospheric composition consistent most recent constraints, early would have been significantly warmed by H2-N2 collision–induced absorption. With two to three times present-day mass of N2 and H2 mixing ratio 0.1, warming be sufficient raise global mean temperatures above 0°C under 75% solar flux, CO2 levels only 2 25 values. Depending on their time emergence diversification, methanogens may caused cooling via conversion CH4, potentially observable consequences geological record.