Table 1 Main surface biogeochemical parameters of the stations sampled.

From: Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean

 

Station

Sampling date

Temperature (°C)

NH4+ (nmol L−1)

NO3− (µmol L−1)

PO43− (µmol L−1)

Si(OH)4 (µmol L−1)

Mixed layer depth (m)

Euphotic layer (m)

Chl a (µg L−1)

Off-plateau

M1

09/03/2018

5.08

421

24.8

1.63

6.49

27

80

0.31

M3_1

05/03/2018

5.60

501

23.4

1.62

2.31

65

93

0.19

M4_1

01/03/2018

4.49

354

25.5

1.72

4.13

49

96

0.18

M4_2

12/03/2018

4.47

481

24.8

1.71

4.80

87

100

0.22

Plateau

M2_1

26/02/2018

5.21

704

21.6

1.45

1.17

62

64

0.28

M2_2

07/03/2018

5.24

1090

21.3

1.47

1.29

61

61

0.32

M2_3

17/03/2018

5.18

899

21.8

1.51

2.60

68

58

0.58

  1. Nutrients and Chl a concentration indicated in the table were sampled at 10 m for plateau stations and 25 m for off-plateau stations. The mean mixed layer depth (difference in sigma of 0.02 to the surface value) and euphotic layer depth (1% light depth) of all CTD casts performed during the occupation of the stations is given.
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