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. 2021 Feb 22;12:1206. doi: 10.1038/s41467-021-21215-2

Table 2.

Analysis of data of DelSontro et al.7 for the 7 lakes investigated by Günthel et al.5.

Lake CH4,av (µM) Asurf (km2) dSML (m) RAV (m−1) Prevailing biological process RCH4 NOMC (%)
Beauchene 0.036 17 5 0.0099 Production 1.24 19
Champlain 0.089 1269 10 0.0011 Oxidation 0.92 −9
Camichagama 0.025 26 7 0.0081 Production 1.21 17
Nominingue 0.067 22 5 0.0087 Production 1.22 18
Ontario 0.032 19,009 12 0.0003 Production 1.22 18
Simard 0.040 170 10 0.0031 Production 1.41 29
St.-Jean 0.009 1065 5 0.0012 — — —

The relative decrease/increase due to oxidation/production in the SML is given by RCH4 − 1. The contribution of net oxic production to diffusive CH4 emissions is NOMC = (RCH4 − 1)/RCH4. All data except for RAV and NOMC are from DelSontro et al.7. Results on all lakes and additional information are provided in Supplementary Table 5 (Supplementary Note 4.1).

CH4,av average CH4 concentration in the SML, Asurf surface area, dSML depth of the surface mixed layer SML, RAV Ased/VSLM assuming a sediment slope of 5°, Ased sediment area in the SML, VSLM volume of the SML, RCH4 ratio of total emissions to total littoral flux (Supplementary Note 4).