Table 1 Average (± confidence interval) water-atmosphere CH4 flux rates and gas transfer velocities using different empirical k models.

na, not available.

k modelVariables*BR wetBR dryFR wetFR dryJR wetJR dry
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
flux
(μmol
m−2 day−1)
k600
(cm hour−1)
R17 (27)v236.5 ±
7.4
5.7103.7 ±
3.6
7.31059.0 ±
48.9
15.095.3 ±
6.4
8.3nana484.4 ±
9.4
9.8
R17 (27)v, u283.7 ±
8.3
6.8104.6 ±
4.3
6.91110.7 ±
49.5
16.499.2 ±
6.8
8.9nana460.4 ±
9.6
9.3
R17 (27)v, u, h324.7 ±
8.8
7.9115.7 ±
4.3
7.7979.8 ±
40.7
15.594.8 ±
6.3
9.0nana535.3 ±
8.7
10.9
Average
flux (R17)
301.0 ±
8.7
6.8108.0 ±
4.0
7.31049.8 ±
46.3
15.696.5 ±
6.5
8.7826.210.2493.3 ±
9.1
10.0
H16 (26)v, u, h275.0 ±
9.8
6.569.1 ±
3.6
3.8601.4 ±
28.3
8.169.6 ±
4.9
6.0nana167.0 ±
4.5
3.4
RC01 (54)u385.0 ±
13.8
9.293.5 ±
4.9
5.0474.7 ±
17.1
8.174.8 ±
5.1
7.1375.2 ±
8.7
4.7224.0 ±
5.8
4.6
B04 (55)v, u, h623.2 ±
18.0
14.7187.4 ±
7.8
10.91542.7 ±
75.7
19.3191 ±
13.2
15.6nana494.7 ±
10.1
10.2

*Current velocity (v) in cm s−1, water depth (h) in m, and wind speed (u) in m s−1.

†Calculated based on the % difference of RC01 and average R17 in the JR dry season.