From: Water-air CO2 fluxes in the Tagus estuary plume (Portugal) during two distinct winter episodes
MARCH 2001 | FEBRUARY 2004 | |||
---|---|---|---|---|
Range | Mean value (SD a ) | Range | Mean value (SD b ) | |
T (°C) | 14.8 – 15.9 | 15.4 (0.3) | 14.4 – 14.9 | 14.7 (0.2) |
S | 31.4 – 34.6 | 32.3 (0.8) | 27.9 – 35.7 | 32.7 (2.1) |
NO3 (μmol l−1) | 0.9 – 13.7 | 8.4 (3.5) | 1.1 – 15.8 | 8.4 (5.9) |
NH4 (μmol l−1) | 0.5 – 3.3 | 1.9 (1.0) | 0.4 – 4.4 | 2.6 (1.5) |
PO4 (μmol l−1) | 0.2 – 1.0 | 0.5 (0.2) | 0.2 – 1.1 | 0.7 (0.3) |
Si(OH)4 (μmol l−1) | 4.8 – 26.5 | 17.1 (7.1) | 1.1 – 16.9 | 9.6 (6.1) |
DO (mg l−1) | 8.3 – 8.9 | 8.5 (0.2) | 7.6 – 9.3 | 8.2 (0.6) |
AOU (μmol kg−1) | −25.9 – -1.7 | −9.3 (6.8) | −35.6 – 25.8 | 2.0 (20.4) |
SPM (mg l−1) | 3.0 – 19.2 | 7.2 (4.6) | 2.1 – 9.6 | 4.1 (2.2) |
Chl a (mg m−3) | 0.7 – 1.6 | 1.1 (0.3) | 0.2 – 1.1 | 0.7 (0.3) |
pH | 7.88 – 7.96 | 7.93 (0.02) | 8.06 – 8.17 | 8.10 (0.05) |
TA (μmol kg−1) | 3026 – 3770 | 3519 (282) | 2357 – 2767 | 2489 (103) |
pCO2 (μatm) | 990 – 1467 | 1207 (140) | 431 – 654 | 531 (70) |
Wind speed (m s−1) | 3.4 – 3.7 | - | 1.0 – 4.2 | - |
Piston velocity (cm h−1) | 3.32 – 4.18 | - | 0.04 – 5.54 | - |