State-Of-The-Art of BC observations in the Arctic and the need for more of them

Evangeliou, Nikolaos; Eckhardt, Sabine; Stohl, Andreas; Popovicheva, O. B.; Sevchenko, V. P.; Eleftheriadis, K.; Sitnikov, N.; Kopeikin, V.M.; Lisitzin, A. P.; Novigatsky, A.N.; Pankratova, N.V.; Starodymova, Dina P.; Kalogridis, Athina C.