(a)

(b)

Figure S5

300 2000

250 80

200

POC (µmol/L)

DOC (µmol/L)

70 300

60 50 40 30

100

20 10

0

0

Figure 3

SML thickness 300

250

DF (µm)

200

150

100

50

Figure 4

1,0 0,9 0,8 0,7

µg/m^3

0,6 0,5 0,4 0,3 0,2 0,1 0,0

Figure 5

FINAL

low wind, low chl-a

30 m

high wind low chl-a

30 m

low wind, high chl-a

-1m 0,00001

0,001

0,1

DOC/Na

*median

EF SML (POC) ocean

SML

EF SML (DOC) ocean

SML

atmosphere

atmosphere

high wind, high chl-a

-1m

10

0,000001

(a)

0,0001

0,01

1

100

POC/Na

(b)

Figure 6

low wind, low chl-a low wind, high chl-a

OM fraction, calculated (%)

100

high wind, low chl-a high wind, high chl-a 1:1

90 80 70

R² = 0,3729

60 50 40 30 20 10 0 0,0

10,0

20,0

30,0

40,0

50,0

60,0

70,0

80,0

90,0

100,0

OM fraction (measured), %

Figure 7

300

250

200

DF

Bergen samples, n=10 150

100

50 Samples from the CVAO and from ANT XXIX/10 and Ant-XXVIII-5, n=71 0

0

5

10

15

20

25

30

water temperature (°C)

Figure S4

35

30 20 10

5

EF

4 3 2 1 0

Figure S3

1000000 800000 600000

EF aer.

80000

60000

40000

20000

0

Figure S10

low wind, low chl-a low wind, high chl-a

OM fraction, calculated (%)

100

high wind, low chl-a high wind, high chl-a

90 80 70 60 50 40

R² = 0,1569

30 20 10 0 0,0

10,0

20,0

30,0

40,0

50,0

60,0

70,0

OM fraction (measured), %

Fig. S8 neu

80,0

90,0

100,0