Table 1 Initial conditions of bioassay experiments, and chlorophyll-a biomass response to nutrient amendments.

From: The influence of Arctic Fe and Atlantic fixed N on summertime primary production in Fram Strait, North Greenland Sea

  

E1

E2

E3

E4

E5

Lat

°N

80.22

76.80

79.59

79.36

78.99

Long

°E

 − 8.14

 − 8.61

 − 4.77

0.23

6.99

Tpot

°C

 − 1.3

0.1

 − 1.6

2.7Ŧ

8.8

Sal

PSU

29.97

30.62

30.03

32.67Ŧ

35.07

MLD§

m

12

10

14

/

14

NO3

µM

 < 0.02

 < 0.02

0.5

12.3

0.3

PO4

0.4

0.3

0.3

1.0

0.1

Si

4.4

1.1

4.4

7.4

 < 0.03

NH4

 < 0.05

 < 0.05

0.5

1.6

 < 0.05

dCo

pM

202

148

164

114*

40

dFe

nM

1.3

0.8

1.8

1.3*

0.4

dMn

5.0

4.2

5.6

2.8*

1.5

dNi

6.2

4.7

5.9

4.4*

3.1

dCu

4.8

3.7

4.5

2.9*

1.3

dZn

1.8

/

1.8

0.9*

0.8

FeN* initial

nM

1.3

0.8

1.3

 − 5.3*

0.3

Initial

Chl.a in mg/m3

0.82

0.25

0.16

0.15

0.51

Control

0.69

0.13

0.18

0.09

0.49

+N

2.16

0.82

0.15

0.09

1.18

+Fe

0.54

0.25

0.16

0.09

0.51

+N + Fe

1.47

0.45

0.15

0.09

1.30

+Dust

0.73

0.23

0.16

0.08

0.59

N-to-initial

%

313

628

80

58

241

(N + Fe)-to-initial

213

344

80

96

265

  1. §Surface mixed layer depth (MLD) defined by threshold value of 0.03 kg/m3 difference to surface reference density (10 m depth).
  2. ŦValues obtained from ship-based thermosalinograph (11 m depth).
  3. *Trace metal concentrations taken from station S8.
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