Structure and Properties of Lake Ice - Freezing of Lakes and the Evolution of their Ice Cover - page 76

Table 3.7 Nutrient concentrations in ice, snow and water in four Finnish lakes in winter 1999
(Lepp ä ranta et al. 2003b): oligotrophic Lake P ä ij ä nne, oligo-mesotrophic Lake P ää j ä rvi, eutrophic
Lake Vesij ä rvi, and hypereutrophic Lake Tuusulanj ä rvi
Lake Phosphorus ( ʼ g/

L)

Nitrogen ( ʼ g/L) Congelation ice fraction %

P - PO 4 Total N - NO 3 Total

P ä ij ä nne 93.0

Ice <2 2 11 102

Snow <2 4 390 590

Water <2 4 225 487

P ää j ä rvi 56.6

Ice 2 3 95 260

Snow <2 3 592 987

Water 5 14 867 1,257

Vesij ä rvi 92.9

Ice <2 <2 <5 204

Snow 5 10 232 755

Water 22 28 185 567

Tuusulanj ä rvi 61.0

Ice 8 18 213 487

Snow 5 6 130 318

Water 40 85 3,216 4,799

Fig. 3.14 Vertical distribution of the electric conductivity, concentration of suspended matter, pH,
and concentration of total nitrogen and phosphorus across snow and ice layers in Lake P ää j ä rvi,
winter 1999. Note that the scales have been adjusted so that the numbers fit into range of 1 - 100.
Data source Lepp ä ranta et al. (2003b)