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Table 1 Mean values for monitored parameters

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

-

  1. astandard deviation (SD) (n = 13).
  2. bstandard deviation (SD) (n = 14).
  3. Seawater surface range of data and mean values for Tagus coastal area during winter 2001 and 2004. Shaded area indicates the parameters that are statistically different (t-test, p < 0.05, n = 27) between the 2001 and 2004 winter sampling periods.