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

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