title: Atmospheric interactions at northern high latitudes from weekly Be-isotopes in surface air.
abstract: We present weekly 7Be (from 1972 to 1995), and weekly/seasonal 10Be (for 1994) data in surface air from ground level stations in Sweden with a coverage of most of the northern high latitudes (56 degrees-68 degrees N). Our Be data are regionally representative and reveal seasonal variation and coupling with tropospheric air mass from middle-low latitudes. The Be data also suggests a few percent, and sometimes episodic, incursion of stratospheric air mass. Frequent precipitation depletes the Be isotopes in the air, but cyclone events contribute to enrichments. A strong coherence between the 7Be record and short-term (monthly-seasonal) change in solar activity is observed which introduces a new mechanism for driving the amplitude of seasonal variation.
authors.affiliation: Institute of Earth Sciences, Uppsala University, Sweden. ala.aldahan@geo.uu.se
authors.forename: A
authors.initials: A
authors.lastname: Aldahan
authors.forename: G
authors.initials: G
authors.lastname: Possnert
authors.forename: I
authors.initials: I
authors.lastname: Vintersved