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306 results on '"Anderson, N. John"'

5. The Arctic in the Twenty-First Century: Changing Biogeochemical Linkages across a Paraglacial Landscape of Greenland

Author

Anderson, N John, Saros, Jasmine E, Bullard, Joanna E, Cahoon, Sean MP, McGowan, Suzanne, Bagshaw, Elizabeth A, Barry, Christopher D, Bindler, Richard, Burpee, Benjamin T, Carrivick, Jonathan L, Fowler, Rachel A, Fox, Anthony D, Fritz, Sherilyn C, Giles, Madeleine E, Hamerlik, Ladislav, Ingeman-Nielsen, Thomas, Law, Antonia C, Mernild, Sebastian H, Northington, Robert M, Osburn, Christopher L, Pla-Rabès, Sergi, Post, Eric, Telling, Jon, Stroud, David A, Whiteford, Erika J, Yallop, Marian L, and Yde, Jacob C

Subjects
Environmental Sciences, Ecological Applications, Ecology, Biological Sciences, Climate Action, tundra, lake, carbon, permafrost, aeolian, Biological sciences, Environmental sciences
Abstract

The Kangerlussuaq area of southwest Greenland encompasses diverse ecological, geomorphic, and climate gradients that function over a range of spatial and temporal scales. Ecosystems range from the microbial communities on the ice sheet and moisture-stressed terrestrial vegetation (and their associated herbivores) to freshwater and oligosaline lakes. These ecosystems are linked by a dynamic glacio-fluvial-aeolian geomorphic system that transports water, geological material, organic carbon and nutrients from the glacier surface to adjacent terrestrial and aquatic systems. This paraglacial system is now subject to substantial change because of rapid regional warming since 2000. Here, we describe changes in the eco- and geomorphic systems at a range of timescales and explore rapid future change in the links that integrate these systems. We highlight the importance of cross-system subsidies at the landscape scale and, importantly, how these might change in the near future as the Arctic is expected to continue to warm.

Published
2017

46. Mercury accumulation rates and spatial patterns in lake sediments from West Greenland: a coast to ice margin transect

Author

Bindler, Richard, Renberg, Ingemar, Appleby, Peter G., Anderson, N. John, and Rose, Neil L.

Subjects
Mercury industry -- Research, Lake sediments -- Research, Water pollution -- Research, Pollution control industry -- Research, Environmental issues, Science and technology
Abstract

The study examines sediments from 21 lakes in the Arctic ranging from the coast of the ice sheet margin in the Sondre Stromford area, for the determination of transport of contaminants, such as mercury. These contaminants are from the industrial areas located at lower latitudes.

Published
2001

47. Modeling diffuse phosphorus loads from land to freshwater using the sedimentray record

Author

Jordan, Philip, Rippey, Brian, and Anderson, N. John

Subjects
Pollution control industry -- Research, Phosphorus, Agriculture, Agricultural industry, Environmental issues, Science and technology
Abstract

The authors studied diffuse phosphorus levels in Friary Lough, a lake in Northern Ireland, and reconstructed the phosphorus loading history using a palaeolimnological model. Results indicate that phosphorus levels increased after the 1940s, when agriculture was becoming a primary focus of the country. Graphs illustrate different findings regarding phosphorus in Friary Lough between the years 1906 and 1995.

Published
2001

50. Predicting epilimnetic phosphorus concentrations using an improved diatom-based transfer function and its application to lake eutrophication management

Author

Bennion, Helen, Juggins, Stephen, and Anderson, N. John

Subjects
Eutrophication -- Methods, Lakes, Phosphorus -- Measurement, Environmental issues, Science and technology
Abstract

A new approach to lake eutrophication management use diatoms as indicators of lake trophic status. In comparison with past eutrophication methods, this approach combines six regional training sets of modern surface-sediment diatom assemblages and uses weighted average partial least squares to reconstruct environmental variables. Application of the method to reconstruct historical total phosphorus concentrations for a hypertrophic Danish lake reveals a high predictive ability.

Published
1996

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