Strobl et al.: Determination of Depositional Bervllium-10 Fluxes in the Area o(the La()tev Sea
2. 0
- --- pMJ4C)2=3: 2. 0
PM94f74 :
1.5
1.5
I 1.0 'Cs-137
1.0
0.5
' 0.5:
.~~--l-"=-~J 0. 0 L
0.0
1980 1960 1940 1920 1900
1980 1980 1940 1920 1900
2.0· ~ PM 9442-3
1.5 i
1
10
0.5i
0.0 L ~~- -
.,--r----!"- ~
1980 1980 1940 1920 1900
::,=-r-~-'
::LJb, ·
1980 1980 1940 1920 1900
I ~ : 1' -\ r~-i ~:--H-_-~P_M-r948_1_2
1980 1980 1940 1920 1900
::: 1,
- - -[PM9482-1:
1 10 I +tt
0.5,
+
0. 0 l--,--r T,~-.J
1980 1960 1940 1920 1900
Year [aJ
1980 1980 1940 1920 1900
Year [aJ
523
Figure 6: 137Cs records of the investigated sediment cores against 210Pb ages. The line represent the time mark
1950.
assumption that the flux density 210Pb into the sediments and the concentration of sedimenting
material has remained constant. A smaller SC then the SC of the sediment core PM9463-8
corresponds to a smaller accumulation due to sediment winnowing, a larger Sc to sediment
focussing.
R
R =~·Sc
x Sc
x
63
~3: mean accumulation rate of core PM 9463-8 [g cm- 2 a- l ]
Rx: mean accu mu I ati on rate of core x [g cm-2 a-I]
SC 63 :
Standing Crop of core PM 9463-8 [dpm cm- 2 ]
SCx :
Standing Crop of core x [dpm cm- 2 ]
(8)
As listed in Table 4 the rates derived with this equation are similar to the ones derived from
the depth profiles of 21OPbex. The deviations range within the uncertainties, suggesting that the
rates derived from the 210Pbcx profiles are not significantly distorted by bioturbative mixing of