Skip to content

Bussjösjön basin and coordinate review

The Neotoma/EPD source site 28869 places Bussjösjön at 55.46667° N, 13.81667° E. Its pollen dataset 53995 belongs to collection unit 39238 (BUS core, handle BUS). The source says that the core was taken at the lake centre in 2.5 m of water, but does not supply a core GPS position or a site area. The 69-sample direct-pollen cohort uses this site coordinate for centre-distance comparisons; those comparisons do not require a lake boundary.

The author-generated Jenny et al. (2016) supplementary inventory, Table S2 (PDF page 8) lists Bussjösjön at 55.44559° N, 13.80172° E, with lake area 0.03 km² = 3 ha, catchment area 0.5 km² and maximum depth 3.0 m. Its row cites Olsson et al. (1997), a sediment chemistry study, as its source. The inspected supplementary PDF has SHA-256 a27df91931ff8a4c75da3daf6699a0e12d2b3c9c084db55a77ab1e69d69dced0. The great-circle distance between the inventory coordinate and the Neotoma site point is 2.5264 km (haversine, Earth radius 6371.0088 km). The inventory is a published source for its own lake entry, but neither its coordinate nor its 3 ha area identifies the Neotoma BUS pollen core.

As a present-day spatial check, the inventory point lies inside OpenStreetMap lake way 247465403, version 2. The closed 50-node polygon (version 2, dated 2019-11-13, and tagged as reviewed against an LM topographic map) spans 55.4443921–55.446581° N and 13.7998235–13.8029397° E. A local planar shoelace calculation gives approximately 2.27 ha, in the vicinity of the inventory's 3 ha. This community map corroborates that the inventory coordinate points at a mapped lake; it does not establish the lake's name, historical size, collection-unit identity or accuracy of the Neotoma site point. The polygon is not an admitted historical LRA basin.

A Lund University literature synthesis (2019), PDF page 16 places Bussjösjön at the coarse 55°28′ N, 13°49′ E, close to the Neotoma site point. It reports approximately 2 ha in the early Holocene and 0.3 ha at the time described, attributing shrinkage to drainage begun in the nineteenth century. It also says cores were collected in 1984–85. These are secondary summaries of earlier field studies, not surveyed boundaries for the Neotoma samples. Olsson et al. (1997) independently describe rerouting of the drainage system and a large reduction in effective catchment area; catchment area is not lake surface area.

The primary Thuning and Linderson (1986) Lund field study reports approximately 0.3 ha for Bussjösjön in its site description (printed page 5, PDF page 5) and places it around 24 m above sea level (printed page 6, PDF page 6). It says that the incoming stream was culverted around the lake in 1954, sharply reducing the former 180 ha drainage area (printed page 7, PDF page 7). Figure 12 (printed page 27, PDF page 18) maps the maximum extent of gyttja and peat deposits at about 1:1100 scale. The authors place the mapped gyttja edge 35–55 m from the then-current shore on the north, west and south, while the eastern edge is not bounded by their profiles (printed page 26, PDF page 17). Pollen sample F assigns maximum gyttja extent to Boreal zone 1, 8,500–9,600 uncalibrated radiocarbon BP in their Table 1 (printed page 25, PDF page 16); that is not a calibrated boundary series for the Neotoma bins. Their study uses 59 sediment profiles and local pollen analyses; it does not identify its profiles as the Neotoma collection unit 39238. The inspected 72-page PDF has SHA-256 91c54054a237b6ea50b8a63c6572494215afaf027e2b0291cc12c447e90b8875. The three records also disagree in reported altitude: Neotoma site 28869 gives 49 m, Jenny et al. Table S2 gives 40 m, and the 1986 field study gives approximately 24 m above sea level. Reference points and vertical datums have not been reconciled, so altitude cannot settle the coordinate discrepancy by itself.

The LandClim metadata give BUS siteradius 69 m, equivalent to 1.4957 ha if treated as a circular lake radius. The existing Swedish source questions also retain a 2 ha source value. These numbers have different source roles and possible time meanings. The field study's approximately 0.3 ha modern lake is smaller than either circular BUS radius area or the 3 ha inventory value. The present-day mapped-water check strengthens the inventory coordinate as a lake-location lead, while leaving the Neotoma point and core identity unresolved. None of these records binds a time-specific lake boundary or radius to the Neotoma pollen samples. Historical basin geometry and every Bussjösjön LRA sample remain unadmitted. Resolve the inventory coordinate against the mapped 1986 lake, then link the BUS core and its calibrated sample ages to dated basin outlines before selecting an LRA radius. The direct observed-pollen result remains valid for its declared coordinate-based estimand.