Table 2 Statistics describing the percentage of cleared catchment land, and CH4 concentration and water–air CH4 fluxes calculated using per-minute resolution data in each estuary type (LA: Lagoons; SD: Small deltas; TS: Tidal systems), disturbance group (dist. group; 1: Low; 2: Moderate; 3: High; 4: Very high), and within the disturbance groups of the estuary types
From: Low methane emissions from Australian estuaries influenced by geomorphology and disturbance
% cleared land | CH4 concentrations (nmol l−1) | Water–air CH4 flux (μmol CH4 m−2 d−1) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Per-minute resolution (averaged per-estuary) | Per-minute resolution (averaged per-estuary) | |||||||||||||
Estuary type | Dist. group | Mean (range) | Mean | Median | SE | IQR | Min | Max | Mean | Median | SE | IQR | Min | Max |
LA | All | 41 (0–100) | 95.8 | 22.1 | 3.5 | 76.5 | 2.8 (42.9) | 2196 (345) | 183.9 | 69.6 | 8.0 | 161.7 | 0.6 (66.9) | 12,510 (995) |
SD | All | 55 (27–79) | 46.0 | 22.6 | 0.9 | 63.0 | 2.5 (3.8) | 277 (142) | 99.6 | 43.1 | 2.0 | 154.2 | 0.3 (3.8) | 680 (362) |
TS | All | 29 (1–86) | 42.5 | 14.5 | 1.0 | 25.7 | 1.9 (4.3) | 559 (126) | 115.5 | 36.6 | 2.5 | 78.3 | 0 (6.7) | 1263 (308) |
All | 1 | 10 (0–31) | 49.4 | 10.3 | 2.5 | 13.0 | 2.2 (21.7) | 559 (123) | 105.7 | 26.7 | 5.3 | 55.2 | 1.2 (37) | 1263 (260) |
All | 2 | 24 (1–60) | 28.2 | 14.6 | 1.1 | 20.1 | 1.9 (12.8) | 670 (112) | 66.4 | 45.3 | 1.5 | 68.4 | 0 (26.1) | 534 (187) |
All | 3 | 54 (15–86) | 58.2 | 13.3 | 3.1 | 34.2 | 2.5 (4.4) | 2196 (295) | 125.9 | 35.3 | 8.0 | 96.3 | 0.4 (7.6) | 12,510 (1342) |
All | 4 | 57 (28–100) | 85.1 | 46.9 | 1.7 | 93.5 | 2.6 (43) | 981 (310) | 191.0 | 109.2 | 3.0 | 294.2 | 0.3 (58.2) | 1032 (536) |
LA | 1 | 18 (0–31) | 56.9 | 33.0 | 3.5 | 68.8 | 9.4 (45.7) | 158 (87) | 115.7 | 84.3 | 4.0 | 87.1 | 50.2 (81.6) | 232 (159) |
2 | 28 (5–50) | 50.1 | 8.3 | 3.9 | 33.8 | 2.8 (18.2) | 670 (128) | 83.2 | 44.9 | 4.5 | 79.3 | 2.9 (37.5) | 534 (146) | |
3 | 43 (15–82) | 109.9 | 18.4 | 8.3 | 89.9 | 3.1 (6.3) | 2196 (598) | 253.9 | 70.9 | 21.9 | 144.0 | 0.6 (15.8) | 12,510 (3036) | |
4 | 66 (39–100) | 114.5 | 36.8 | 4.6 | 123.0 | 3 (100.8) | 981 (515) | 187.1 | 88.1 | 5.8 | 262.4 | 0.8 (136.4) | 1032 (704) | |
SD | 3 | 57 (27–79) | 32.2 | 10.9 | 1.2 | 26.5 | 2.5 (3.2) | 277 (124) | 62.4 | 22.3 | 2.2 | 59.3 | 0.4 (2.8) | 651 (334) |
4 | 52 (30–78) | 59.2 | 48.9 | 1.3 | 66.2 | 2.6 (4.4) | 258 (160) | 135.4 | 101.0 | 3.0 | 191.8 | 0.3 (4.8) | 680 (390) | |
TS | 1 | 4 (1–5) | 48.4 | 9.6 | 2.8 | 11.9 | 2.2 (3.7) | 559 (150) | 104.3 | 24.0 | 6.0 | 34.1 | 1.2 (3.5) | 1263 (336) |
2 | 19 (1–60) | 20.6 | 15.0 | 0.5 | 17.3 | 1.9 (5.2) | 182 (91) | 60.7 | 45.4 | 1.3 | 61.9 | 0 (10.2) | 335 (244) | |
3 | 73 (60–86) | 21.0 | 7.9 | 1.0 | 25.4 | 2.8 (3.1) | 98 (51) | 32.2 | 12.0 | 1.9 | 32.1 | 1.1 (1.5) | 253 (129) | |
4 | 49 (28–62) | 89.5 | 76.0 | 2.3 | 154.9 | 4 (4.4) | 330 (202) | 283.0 | 308.1 | 6.8 | 398.8 | 7 (8.6) | 854 (494) | |
