Table 1 Mass balance components.

From: Contribution of oxic methane production to surface methane emission in lakes and its global importance

Site

Mass balance component

Symbol

Whole system

Per volume

[mol d−1]

[kg d−1]

[nmol l−1 d−1]

Northeast basin

Surface emission

FS

942 ± 538

15 ± 9

90 ± 52

Methane oxidation

MOx

226

4

22

Lateral sediment input

FL

372 ± 57

6 ± 1

36 ± 6

Diffusion from thermocline

Fz

56 ± 55

1 ± 1

5 ± 5

Internal (oxic) production

Pnet

752 ± 771

12 ± 12

72 ± 74

South basin

Surface emission

FS

795 ± 268

13 ± 4

148 ± 50

Methane oxidation

MOx

141

2

26

Lateral sediment input

FL

423 ± 65

7 ± 1

79 ± 12

Diffusion from thermocline

Fz

41 ± 54

1 ± 1

8 ± 10

Internal (oxic) production

Pnet

470 ± 400

8 ± 6

88 ± 75

  1. Oxic production was computed by measuring/estimating surface emission, oxidation, lateral input, as well as vertical diffusion (see Fig. 1) and solving the mass balance for the missing component
  2. Seven replicate measurements were taken in the open water of the Northeast (69.5 m deep; surface area 2,006,700 m2; 53°09'20.2''N 13°01'51.5''E) and South basin (20.5 m deep; surface area 1,122,775 m2; 53°08'36.6''N 13°01'42.8''E) of Lake Stechlin during the stratified period in 2016 (June–July). Values listed as mean ± SD. Note that Monte Carlo simulation was used to solve the mass balance after the target component (in bold; mean ± 1 SD) (see Methods for details). Supplementary Fig. 5 illustrates the density function of the Northeast and South basin dataset. If the Monte Carlo simulation were to be applied to whole lake data (combining South and Northeast basins data), oxic methane production rates (denoted as Pnet in Eq. (1)) do not change: 78 ± 80 nmol l−1 d−1 (FS = 2503 ± 1160, MOx = 496, FL = 1198 ± 185, Fz = 139 ± 170, Pnet = 1653 ± 1703 mol d−1)
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