A Coherent Signature of Anthropogenic Nitrogen Deposition to Remote Watersheds of the Northern Hemisphere

Research output: Contribution to journalArticle

Abstract

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 (N-15:N-14) 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.

Details

Authors
  • Gordon W. Holtgrieve
  • Daniel E. Schindler
  • William O. Hobbs
  • Peter R. Leavitt
  • Eric J. Ward
  • Lynda Bunting
  • Guangjie Chen
  • Bruce P. Finney
  • Irene Gregory-Eaves
  • Sofia Holmgren
  • Mark J. Lisac
  • Peter J. Lisi
  • Koren Nydick
  • Lauren A. Rogers
  • Jasmine E. Saros
  • Daniel T. Selbie
  • Mark D. Shapley
  • Patrick B. Walsh
  • Alexander P. Wolfe
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geology
Original languageEnglish
Pages (from-to)1545-1548
JournalScience
Volume334
Issue number6062
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes