作者：Ensign, Scott H.; Halls, Joanne N.; Peck, Erin K.
作者单位：University of North Carolina; University of North Carolina Wilmington; University of Massachusetts System; University of Massachusetts Amherst
摘要：Watershed sediment can increase elevation of tidal wetlands struggling against rising seas, but where and how much watershed sediment helps is unknown. By combining contiguous US datasets on sediment loads and tidal wetland areas for 4972 rivers and their estuaries, we calculated that river sediment accretion will be insufficient to match sea level rise in 72% of cases because most watersheds are too small (median 21 square kilometers) to generate adequate sediment. Nearly half the tidal wetla...
作者：Roederer, Ian U.; Vassh, Nicole; Holmbeck, Erika M.; Mumpower, Matthew R.; Surman, Rebecca; Cowan, John J.; Beers, Timothy C.; Ezzeddine, Rana; Frebel, Anna; Hansen, Terese T.; Placco, Vinicius M.; Sakari, Charli M.
作者单位：University of Michigan System; University of Michigan; Carnegie Institution for Science; United States Department of Energy (DOE); Los Alamos National Laboratory; United States Department of Energy (DOE); Los Alamos National Laboratory; University of Notre Dame; University of Oklahoma System; University of Oklahoma - Norman; State University System of Florida; University of Florida; Massachusetts Institute of Technology (MIT); Massachusetts Institute of Technology (MIT); Stockholm University; National Science Foundation (NSF); California State University System; San Francisco State University
摘要：The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and inaccessible to experiments so must be extrapolated by using nucleosynthesis models. We examined element abundances in a sample of stars that are enhanced in r-process elements. The abundances of elements ruthenium, rhodium, palladium, and silver (...
作者：Mercer, Theresa
作者单位：Cranfield University
