2.5 Summary of Section 2

Differences between the albedo and specific heat capacity of terrains mean that they heat up at different rates. Air in contact with the warm terrain rises in convection currents, and horizontal winds are set up across the whole planet. The winds can transport pollutants such as PBDEs to the Arctic, where they are deposited in snowfall and as a result can be detected in Arctic wildlife. Ocean currents and rivers can also transport pollution into the Arctic.