μ-XRF and varve data from Lake Nautajärvi (NAU-23)

Data from the NAU-23 core sequence of Lake Nautajärvi in southern Finland. Included are the files used by Lincoln et al. (2025) to run statistical analyses on m-XRF core scanning data. The code used to run the analyses from these files can be found at https://doi.org/10.1016/j.scitotenv.2025.178519.

1.  The 'XRF_Varve_data.RData' object contains four files:
   • 'XRF' is the replicate averaged 0.2mm resolution m-XRF data from the NAU-23 sequence. 
   • ‘variance’ contains the replicate variances on each element at 0.2 and 0.4mm resolution.
   • ‘VT’, contains the Nautajärvi varve thicknesses from Ojala and Alenius (2005). These data are also available on Pangaea at https://doi.org/10.1594/PANGAEA.968802
   • ‘max_depth’ contains the maximum varve depth (mm) in the composite NAU-23 stratigraphy. 
2. ‘Fig1_Halli_Data.RData’ contains the monthly meteorological data from the Halli weather station in southern Finland, which is used in Figure 1 of Lincoln et al. (2025).
3. ‘Image_plots.RData’ contains three files:
   • ’G1_chronology’ is the varve chronology for the surface gravity core taken from the NAU-23 sequence.
   •  ‘G1_image’ is the corresponding core photo for the gravity core.
   • ‘Core_image’ is a JPEG raster of the core section used in Figure 3 of Lincoln et al. (2025).

References

Lincoln, P.C., Tjallingii, R., Kosonen, E., Ojala, A.E.K., Abrook, A.M., Martin-Puertas, C., 2025. Disruption of boreal lake circulation in response to mid-Holocene warmth; evidence from the varved sediments of Lake Nautajärvi, southern Finland. Science of the Total Environment. Xxxx, xxxx, 178519. https://doi.org/10.1016/j.scitotenv.2025.178519

Ojala, A.E.K., Alenius, T., 2005. 10000 years of interannual sedimentation recorded in the Lake Nautajärvi (Finland) clastic-organic varves. Palaeogeogr. Palaeoclimatol.Palaeoecol. 219, 285-302.https://doi.org/10.1016/j.palaeo.2005.01.002.