SW Greenland Lakes d13C CN

Stable carbon isotope (δ13C) and molar carbon to nitrogen (C:N) ratio data for terrestrial and aquatic vegetation, particulate and dissolved organic matter (POM and DOM, respectively), and surface sediments from lakes across three hydro-climatic regions in southwest Greenland. Our hypothesis was to determine the relatively abundance of C sources to the pelagic DOM and sedimentary OM pools in those lakes. The data were collected from a number of previously published works. Interpreting the data: The data are arranged by observations of three lake groups (Coastal, Central, and Ice margin) that are distinguished in part by their mean annual precipitation (MAP, in mm) as well as the different organic matter (OM) sources and the DOM, POM, and sediment C pools. Stable C isotope values and elemental C:N ratios for solid samples were measured using established methods, e.g., Anderson et al. (2018). DOM δ13C values were measured according to Osburn and St-Jean (2007). N values for C:N ratios of DOM were computed from total nitrogen minus dissolved inorganic nitrogen (sum of ammonium, nitrite, and nitrate) minus particulate nitrogen. References Anderson, N. J., M. J. Leng, C. L. Osburn, S. C. Fritz, A. C. Law, and S. McGowan. 2018. A landscape perspective of Holocene organic carbon cycling in coastal SW Greenland lake-catchments. Quat. Sci. Rev. doi:10.1016/J.QUASCIREV.2018.09.006 Osburn, C. L., and G. St-Jean. 2007. The use of wet chemical oxidation with high-amplification isotope ratio mass spectrometry (WCO-IRMS) to measure stable isotope values of dissolved organic carbon in seawater. Limnol. Oceanogr. Methods 5: 296–308. doi:10.4319/lom.2007.5.29