Summary Greatly enhanced atmospheric CO 2 concentrations are the most likely mechanism for offsetting the effects of reduced solar luminosity early in the earth's history. CO 2 levels of 80 to 600 times the present value could have maintained a mean surface temperature of 0掳C to 15掳C, ...
Eventually they discovered sediments of the right age near a traditional African village called Stakishari. By assembling a drilling rig and extracting hundreds of meters of samples from under the ground they were able to obtain exactly the piece of Earth's history they had been searching for. C...
The alkenone–pCO2 methodology has been used to reconstruct the partial pressure of ancient atmospheric carbon dioxide (pCO2) for the past 45 million years of Earth's history (Middle Eocene to Pleistocene epochs). The present long-term CO2 record is a composite of data from multiple ocean loca...
Available estimates indicate that, throughout Earth’s history, atmospheric CO2has generally remained above Pleistocene glacial levels of ~180 ppm (refs.1,13,19,24). Our reconstruction shows sustained low CO2of about 330 ± 210 ppm during much of the LPIA, which declines during its ap...
研究未来全球变暖和氮沉降下C3、C4植物植硅体的变化规律,对松嫩草原优势群落演替方向的预判、古植被及古气候的重建和全球环境变化的预测等工作具有重要意义。本文选取松嫩草原的优势物种羊草(Leymuschinensis,C3)和芦苇(Phragmitescommunis,C4),对其进行模拟增温、施氮、CO2
While Earth was ice-bound, the white planet reflected more of the sun’s energy back into space, making it hard to reverse the cold climate, even with high CO2levels. But the near-global ice cover also shut down the weathering thermostat, which allowed volcanic CO2to build to perhaps100 ...
The history of atmospheric carbon dioxide on Earth began with the release of the gas from beneath the surface of the newly formed planet. The concentration of pCO2 remained extremely high from Precambrian times to at least the Devonian Period, perpetuated by the release of extremely large amounts...
Quantifying ancient atmospheric pCO2 provides valuable insights into the interplay between greenhouse gases and global climate. Beyond the 800-ky history uncovered by ice cores, discrepancies in both the trend and magnitude of pCO2 changes remain among d
That was the reaction of meteorologist Eric Holthaus to news that atmospheric carbon dioxide levels have reached heights not seen in the entirety of human existence – not history, existence. This is the first time in human history our planet's atmosphere has had more than 415ppm CO2.Not jus...
The work reviewed is concerned almost entirely with the history of temperatures at the surface of the earth, and especially at the sea surface. The methods... Savin,S M - 《Ann.rev.earth Planet.sci》 被引量: 780发表: 1977年 Effects of high CO2 levels on surface temperature and atmospheri...