Table 2 First-order estimate of modern oceanic Re and U budgets based on the updated shelf sediment sink

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

 

Re [Kmol y−1]

% of input flux

U [Mmol y−1]

% of input flux

δ238U [‰]

Total input

429

 

53

  

     River dissolved load

429a

100%

42b

79%

−0.34c

     Groundwater

–

–

9.3b

18%

–

     Aeolian

–

–

1.8b

3.4%

–

Total output (Updated Suboxic+Anoxic+Oxic)

860 ± 175

200 ± 41

99.4 ± 27.2

188 ± 51

−0.31 ~ −0.30

      Anoxic sediment

28.0d

6.1

4.5c

8.5

+0.2c

     Suboxic sediment

375d

87.4

15.3 ± 10.6b

29

−0.30

     Oxic sediment

26.1d

6.5

22.9c

43

−0.395

     Shelf sedimente

431 ± 175

100 ± 41

57 ± 22

108 ± 42

–

     Shelf sedimentf

685 [734, 1830]

160 [171, 427]

184 [154, 252]

346 [291, 476]

–

     Updated Suboxic sedimentg

806 ± 175

188 ± 41 g

72 ± 25 g

136 ± 47 g

–

  1. aRef. 21.
  2. bFlux and uncertainty in ref. 20.
  3. cThe output in oxic sediment includes marine carbonates, Mn-oxides, oceanic crust alteration, pelagic clays, and coastal retention5.
  4. dRef. 3.
  5. eEstimated with the correlation between sedimentary reductive removal and DO consumption (this study) and the sediment oxygen consumption rates53; the uncertainties (1 SD) were propagated from the correlation between sedimentary reductive removal of Re and U and sediment oxygen consumption (this study) and the sediment oxygen consumption rate for the global shelf sediments53.
  6. fEstimated by extrapolating the compiled fluxes in shelf sediments to the global suboxic sediments, reported as median [lower, upper bounds] of 95% confidence interval;
  7. gSum of the sinks in shelf sediment (this study) and the suboxic sediment beyond shelf reported in refs. 3,20. The uncertainties were propagated from those associated with these two terms.
Back to article page