Photo: Julian Stratenschulte / DPA / Globallookpress.com
Scientists at the University of Michigan and the University of Arizona (USA) came to the conclusion that the future rate of global warming increase. Researchers for the first time, successfully simulated the extreme warming in the early Eocene (about 56 million years ago), which is expected to be repeated in the future. This publication reports Science Daily.
Using climate model CESM1.2. the researchers found that the rate of warming increases dramatically with increasing level of carbon dioxide in the atmosphere. One of the factors that explains the high sensitivity of Earth’s climate system is cloud cover. A decrease in cloudiness and opacity of the atmosphere in the Eocene increased warming caused by carbon dioxide. Similar additional conditions can be observed today, but the climate sensitivity level of the Eocene could not be reached during the life of the current generation.
Early Eocene (about 48-56 million years ago) was the warmest period in Earth’s history over the last 66 million years. It began with the Paleocene-Eocene thermal maximum, which is characterized by an abrupt warming that caused the extinction of many species. The surface temperature of the Earth was 14 degrees Celsius warmer than today. The level of carbon dioxide was 1,000 parts per million, which is two times the current level.
According to climatologists, if nothing is done to reduce carbon dioxide emissions, by the end of the century, it can again reach 1,000 parts per million.
CESM1.2 was one of the climate models used in the preparation of the fifth assessment report of the intergovernmental panel on climate change. Its ability to simulate the warming in the early Eocene in accordance with paleoclimatic data indicates the feasibility of the prediction of future climate change.
Video, photo All from Russia.