caa a22 4500 465792693 CHVBK 20180323112029.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.2307/1351783 doi (NATIONALLICENCE)springer-10.2307/1351783 Sugai Susan Institute of Marine Science, University of Alaska, 99775-1080, Fairbanks, Alaska aut Transport and sediment accumulation of210Pb and137Cs in two Southeast Alaskan fjords [Elektronische Daten] [Susan Sugai] Sediment profiles of210Pb and137Cs in cores collected at increasing distances from the heads of Smeaton Bay and Boca de Quadra fjords indicate that watersheds influence the inventories of radioisotopes present and that the steep topographies of the fjords enhance sediment redistribution. Episodic deposition of terrestrially derived sediment was responsible for roughly 50% of the137Cs and 45% of the210Pb inventories in shallower (less than 180 m) locations in Wilson and Bakewell arms of Smeaton Bay.210Pb sedimentation rates at shallower sites when corrected for episodic deposition were less than sedimentation rates obtained in the deep basins of the fjords where sediment focusing and increased primary productivity in the overlying water column occur. Higher fluxes of dissolved Mn from surficial sediments and subsequent reoxidation in the overlying water may have enhanced scavenging of210Pb in basin locations, resulting in higher inventories. Episodic events have occurred frequently in Smeaton Bay and Boca de Quadra suggesting that steady-state conditions with respect to sedimenting particles can be achieved only when averaged over long time periods approaching the time over which137Cs and210Pb are useful. Estuarine Research Federation, 1990 Estuaries Springer-Verlag 13/4(1990-12-01), 380-392 0160-8347 13:4<380 1990 13 12237 https://doi.org/10.2307/1351783 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.2307/1351783 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sugai Susan Institute of Marine Science, University of Alaska, 99775-1080, Fairbanks, Alaska aut NATIONALLICENCE 773 0- Estuaries Springer-Verlag 13/4(1990-12-01), 380-392 0160-8347 13:4<380 1990 13 12237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer