Showing posts from October 27, 2020

A vicious circle. Global heating leads to melting ice leads to more heating.....

                                                       Nature Communications A polar bear navigates a dwindling ice pack. Photo by Andreas Weith The melting of ice in polar and mountain regions around the world could lead to an additional 0.43 °C increase in global warming in the long term, according to a study published online in Nature Communications. The loss of ice cover is known to influence air temperatures, for example through albedo changes (the amount of sunlight reflected from the Earth’s surface). Although the mechanisms that are responsible for increased warming are well understood, it isn't clear how large the contributions of different ice sheets and feedback mechanisms to global temperature changes are. Nico Wunderling and colleagues use a simplified Earth system model in combination with different CO2 concentration levels to provide such an estimate. They find an additional median warming of 0.43°C in response to the loss of all ice sheets at CO2 concentrations sim