Anderson, NJ;
Appleby, PG;
Bindler, R;
Renberg, I;
Conley, DJ;
Fritz, SC;
Jones, VJ;
... Yang, H; + view all
(2019)
Landscape-Scale Variability of Organic Carbon Burial by SW Greenland Lakes.
Ecosystems
10.1007/s10021-019-00368-8.
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Abstract
Lakes are a key feature of arctic landscapes and can be an important component of regional organic carbon (OC) budgets, but C burial rates are not well estimated. 210 Pb-dated sediment cores and carbon and organic matter (as loss-on-ignition) content were used to estimate OC burial for 16 lakes in SW Greenland. Burial rates were corrected for sediment focusing using the 210 Pb flux method. The study lakes span a range of water chemistries (conductivity range 25–3400 µS cm −1 ), areas (< 4–100 ha) and maximum depths (~ 10–50 m). The regional average focusing-corrected OC accumulation rate was ~ 2 g C m −2 y −1 prior to ~ 1950 and 3.6 g C m −2 y −1 after 1950. Among-lake variability in post-1950 OC AR was correlated with in-lake dissolved organic carbon concentration, conductivity, altitude and location along the fjord. Twelve lakes showed an increase in mean OC AR over the analyzed time period, ~ 1880–2000; as the study area was cooling until recently, this increase is probably attributable to other global change processes, for example, altered inputs of N or P. There are ~ 20,000 lakes in the study area ranging from ~ 1 ha to more than 130 km 2 , although over 83% of lakes are less than 10 ha. Extrapolating the mean post-1950 OC AR (3.6 g C m −2 y −1 ) to all lakes larger than 1000 ha and applying a lower rate of ~ 2 g C m −2 y −1 to large lakes (> 1000 ha) suggests a regional annual lake OC burial rate of ~ 10.14 × 10 9 g C y −1 post 1950. Given the low C content of soils in this area, lakes represent a substantial regional C store.
| Type: | Article |
|---|---|
| Title: | Landscape-Scale Variability of Organic Carbon Burial by SW Greenland Lakes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s10021-019-00368-8 |
| Publisher version: | https://doi.org/10.1007/s10021-019-00368-8 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| Keywords: | Nitrogen; arctic; diatoms; tundra; biogenic silica; DOC; soil carbon |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL SLASH UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10074859 |
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