Table 1 Fluxes of 224Ra, DO, NH4+, Re and U, and amplification factors of sediment surface area in the East China Sea

From: Overlooked shelf sediment reductive sinks of dissolved rhenium and uranium in the modern ocean

Total fluxes based on the 224Ra/228Th disequilibria approach

Diffusive flux

Station

DO

\(\xi\) b

224Rab

DOb

NH4+b

Rea

Ua

Re

U

 

μmol L−1

 

dpm m−2 d−1

mmol m−2 d−1

mmol m−2 d−1

pmol m−2 d−1

nmol m−2 d−1

pmol m−2 d−1

nmol m−2 d−1

Summer 2017b

Y3-S

65

11

730 ± 110

30 ± 4

10 ± 1

720 ± 210 (0)

–c

66 ± 13

–c

Y4-S

116

11

990 ± 170

59 ± 20

13 ± 2

110 ± 23 (−49 ± 9)

11 ± 2.4 (0)

11 ± 1.0

1.1 ± 0.1

Y5-S

76

26

1000 ± 160

35 ± 10

8.8 ± 1.6

–c

49 ± 12 (0)

–c

1.9 ± 0.3

Y7-S

115

25

740 ± 190

45 ± 14

4.6 ± 1.2

–d

–d

–d

–d

E14-S

84

1.9

270 ± 55

6 ± 1

1.6 ± 0.4

20 ± 5.1 (−41 ± 9)

1.5 ± 0.6 (0)

11 ± 1.4

0.8 ± 0.2

E13-S

118

10

890 ± 110

10 ± 3

3.6 ± 0.5

82 ± 19 (−400 ± 56)

6.3 ± 1.8 (0)

8.5 ± 1.5

0.6 ± 0.2

E10-S

144

15

450 ± 170

29 ± 11

3.7 ± 1.4

–c

34 ± 14 (0)

–c

2.6 ± 0.2

E4-S

136

3.8

300 ± 180

17 ± 10

2.8 ± 1.7

26 ± 16 (−150 ± 93)

–d

7.3 ± 1.1

–d

E3-S

164

3.7

220 ± 85

25 ± 10

4.5 ± 1.7

53 ± 22 (0)

13 ± 5.5 (−30 ± 13)

15 ± 1.4

3.7 ± 0.4

Summer 2021

F1-S

169

3.8

490 ± 170

9 ± 5

5.6 ± 1.9

65 ± 23 (−180 ± 62)

–d

25 ± 1.0

–d

F2-S

120

19

140 ± 220

54 ± 6

8.6 ± 1.5

120 ± 22 (0)

22 ± 4.6 (0)

11 ± 0.6

2.0 ± 0.2

F3-S

188

25

850 ± 150

120 ± 29

16 ± 3

320 ± 66 (−660 ± 130)

44 ± 13 (−40 ± 8)

20 ± 1.2

2.8 ± 0.6

F4-S

173

35

940 ± 140

50 ± 10

13 ± 2

320 ± 61 (0)

56 ± 14 (0)

15 ± 0.6

2.6 ± 0.4

Winter 2018b

A3-W

241

129

4400 ± 200

250 ± 30

36 ± 4

1100 ± 260 (−620 ± 54)

–d

9 ± 2.1

–d

B3-W

242

175

3800 ± 350

520 ± 70

58 ± 8

–d

–d

–d

–d

D2-W

214

76

4800 ± 360

220 ± 20

21 ± 2

510 ± 64 (−860 ± 90)

91 ± 19 (0)

7.0 ± 0.5

1.2 ± 0.2

S1-W

208

40

2200 ± 290

210 ± 40

26 ± 4

900 ± 180 (0)

110 ± 20 (0)

24 ± 2.6

2.8 ± 0.2

E3-W

190

13

840 ± 290

44 ± 16

22 ± 8

380 ± 140 (−390 ± 140)

36 ± 13 (−4 ± 1)

32 ± 1.8

3.0 ± 0.3

E1-W

253

333

4700 ± 450

680 ± 140

57 ± 11

4600 ± 950 (0)

830 ± 320 (0)

14 ± 0.7

2.6 ± 0.9

  1. aThe regenerated fluxes out of the sediments (Fout with negative values) due to the additional release of Re and U from the “particulate source” are presented in parentheses.
  2. bFluxes of 224Ra, DO, and NH4+, as well as \(\xi\) for the cruises in 2017 and 2018, are adopted from refs. 31,43.
  3. cNo data due to limited sample size;
  4. dFluxes cannot be calculated due to the complicated removal-release within the upper few cm indicated by the distinct zig-zag patterns.
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