Extended Data Table 2 Canth transport uncertainty estimates

From: Circulation-driven variability of Atlantic anthropogenic carbon transports and uptake

Region

Water mass

 

σTreg

(C_reg – C_sect)

σCTT

σC_reg

Treg

σCTC

σCT

 

(Sv)

(µmol kg−1)

(TgC yr−1)

(µmol kg−1)

(Sv)

(TgC yr−1)

(TgC yr−1)

Surface to bottom of mixed layer

78° W to 46° W

1

0.63

19.7

5

29.3

−0.97

−10

11

46° W to 10° W

2

0.87

31.7

10

29.2

−5.4

−58

59

Bottom of mixed layer to ɣn < 26.7

78° W to 70° W

3

5.04

27.3

51

9.5

4.2

15

53

70° W to 46° W

9

4.53

33.9

57

2.9

−5.2

−5

57

46° W to 30° W

15

1.08

38.3

15

5.1

−2.5

−5

16

30° W to 10° W

21

0.39

43.6

6

3.1

−1.3

−1

7

26.7 < ɣn < 27.4

78° W to 70° W

4

2.59

12.7

12

13.2

2.3

11

17

70° W to 46° W

10

2.91

20.1

22

8.3

−2.2

−7

23

46° W to 30° W

16

1.46

23.3

13

8.7

−2.3

−8

15

30° W to 10° W

22

1.77

24.6

16

9.7

−3.6

−13

21

27.4 < ɣn < 27.65

78° W to 70° W

5

0.61

3.8

1

0.5

0.53

0

1

70° W to 46° W

11

0.75

2.4

1

1.2

−0.13

0

1

46° W to 30° W

17

0.56

2.9

1

2.7

−0.13

0

1

30° W to 10° W

23

0.57

3.4

1

2.1

−0.26

0

1

27.65 < ɣn < 27.85

78° W to 70° W

6

0.48

9.8

2

2.7

0.17

0

2

70° W to 46° W

12

0.60

5.1

1

2.8

−0.37

0

1

46° W to 30° W

18

0.50

0.9

0

1.8

−0.21

0

0

30° W to 10° W

24

0.42

4.6

1

2.0

−0.48

0

1

27.85 < ɣn & Pressure <1775 dbar

78° W to 70° W

7

0.55

0.0

2

0.0

−0.62

0

2

70° W to 46° W

13

0.38

4.5

1

3.2

−1.35

−2

2

46° W to 30° W

19

0.23

0.6

0

2.5

−0.68

−1

1

30° W to 10° W

25

0.18

−0.7

0

3.0

−0.71

−1

1

Pressure > 1775 dbar

78° W to 70° W

8

0.92

0

−3

0.0

−1.7

−3

4

70° W to 46° W

14

1.89

−11.5

−8

4.5

−5.2

−9

12

46° W to 30° W

20

1.09

−14.8

−6

3.2

−3.6

−4

7

30° W to 10° W

26

0.86

−14.2

−4

3.2

−3.1

−4

6

Bering Strait

  

0.20

27.0

2

6.2

0.80

2

3

Ekman

  

0.20

47.7

4

6.3

3.50

6

7

Florida Strait

  

0.99

25.9

10

6.2

31.58

72

72

Canth estimate & ∆Canth

        

37

  

Total uncertainty in individual 10−day Canth transport estimates

0.135 Pg C yr−1

  

Total uncertainty in annual average Canth transport

0.039 Pg C yr−1

  

Total uncertainty in average Canth transport for full time-series

0.013 Pg C yr−1

  1. Key to column headings: σTreg, uncertainty in regional transport; C_reg, regional Canth average; C_sect, section Canth average; (C_reg – C_sect), regional Canth anomaly; σCTT, Canth transport transport-related uncertainty; σC_reg, uncertainty in regional Canth average; Treg, regional transport; σCTC, uncertainty in Canth transport due to uncertainty in Canth; σCT, total uncertainty. Section-averaged Canth (Csect) is estimated as 18.8 × 10−6 kmol m−3 (~18 µmol kg−1). Combining in quadrature, each 10-day estimate of Canth transport has an uncertainty of 0.135 Pg C yr−1. Assuming that there are 12 independent estimates in the year then the uncertainty on the annual average Canth transport is 0.135 Pg C yr−1/(12)1/2 = 0.039 Pg C yr−1. Assuming there are 102 independent estimates across the full 8.5-year time-series then the uncertainty on the full time-series average Canth transport is 0.135 Pg C yr−1/(102)1/2 = 0.013 Pg C yr−1.
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