神秘的三重对称性可能影响地球气候

could influence Earth’s climate A LINE that runs through Africa, Europe, Alaska and both poles divides Earth into two halves that reflect the same amount of light – and this may have implications for solar geoengineering schemes. It was previously known that the northern and southern hemispheres have almost equal reflectivity, or albedo, but Jianhao Zhang at the National Oceanic and Atmospheric Administration in the US and his colleagues have now uncovered a second line of symmetry along the 27° east and 153° west meridians. The hemispheres separated by this line are nearly equal in three respects: their albedo in clear skies, the reflectivity of clouds and the fractions covered by ice-free oceans. …