tell us more about this because it is frightening and alarming. it is not technically is frightening and alarming. it 3 not technically the gulf stream, it is the atlantic circulation which the gulf stream as a part of, but it is this large circulation system that covers the atlantic ocean and brings warm salty water masses from the tropics to the north atlantic and leads to relatively mild temperatures in europe, particularly in the u k and more so in iceland and norway. it has been known from proxy evidence from iceland and greenland that models suggest that there are two stable modes of operation, a strong mode and a weak mode. in principle, there are