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Estimate Submarine Groundwater Discharge (SGD)to the Atlantic Ocean. 232 Th 228 Ra. half life = 5.7 years l = 0.12 yr -1. Procedure:. 1. Measure inventory of 228 Ra in upper km of Atlantic Ocean. Flux 228 Ra = Inventory x l 2. Subtract riverine and sediment fluxes.

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slide1

Estimate Submarine Groundwater Discharge (SGD)to the Atlantic Ocean

232Th 228Ra

half life = 5.7 years

l = 0.12 yr-1

Procedure:

1. Measure inventory of 228Ra

in upper km of Atlantic Ocean.

Flux 228Ra = Inventory x l

2. Subtract riverine and

sediment fluxes.

3. Estimate 228Ra in SGD.

TTO

1981-1989

228Ra flux (atoms)

SGD Flux =

[228Ra]SGD (at/L)

Bob Key

Princeton

slide2

Distribution of 228Ra in SGD (226 samples)

median

mean

Median = 6.5 x 106 at/L Mean = 17 x 106 at/L

(3.9 dpm/L)

(1.5 dpm/L)

slide3

Total 228Ra Inventory =

2.9 x 1024 atoms

Decay = 3.5 x 1023 at/yr

River flux = 0.3 x 1023 at/yr

Sed. flux = 1.3 x 1023 at/yr

SGD flux = 1.9 x 1023 at/yr

TTO

1981-1989

Mean 228Ra in SGD =

17 x 106 at/L (3.9 dpm/L)

Median 228Ra in SGD =

6.5 x 106 at/L (1.5 dpm/L)

SGD flux = 1-3 x 1016 L/yr

River flux = 2.4 x 1016 L/yr

40-120% of the river water flux; probably >>river metal, nut, C flux