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A Coherent Signature of Anthropogenic Nitrogen Deposition to Remote Watersheds of the Northern Hemisphere
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A Coherent Signature of Anthropogenic Nitrogen Deposition to Remote Watersheds of the Northern Hemisphere
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Journal Article
A Coherent Signature of Anthropogenic Nitrogen Deposition to Remote Watersheds of the Northern Hemisphere
2011
Overview
Humans have more than doubled the amount of reactive nitrogen (Nr) added to the biosphere, yet most of what is known about its accumulation and ecological effects is derived from studies of heavily populated regions. Nitrogen (N) stable isotope ratios (¹⁵N:¹⁴ N) in dated sediments from 25 remote Northern Hemisphere lakes show a coherent signal of an isotopically distinct source of N to ecosystems beginning in 1895 ± 10 years (±1 standard deviation). Initial shifts in N isotope composition recorded in lake sediments coincide with anthropogenic CO₂ emissions but accelerate with widespread industrial Nr production during the past half century. Although current atmospheric Nr deposition rates in remote regions are relatively low, anthropogenic N has probably influenced watershed N budgets across the Northern Hemisphere for over a century.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
Animal, plant and microbial ecology
/ Biological and medical sciences
/ Earth and Related Environmental Sciences
/ Ecotoxicology, biological effects of pollution
/ Exact sciences and technology
/ Fundamental and applied biological sciences. Psychology
/ Geologi
/ Geology
/ Geovetenskap och relaterad miljövetenskap
/ humans
/ Isotopes
/ Lakes
/ Nitrogen
/ Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
/ Runoff
