0
50
100
150
200
0
100
200
300
400
500
600
700
800
900
1000
1993
1989
1997
1979
1984
Pb (pmol kg )
_ 1
Depth (m)
Figure 4 Pb in ocean profiles in the Sargasso Sea near Bermuda: 1979 data from Schaule and Patterson 1983; 1984 data from
Boyle et al. (1986); data from Veron et al 1993; 1993 data from Wu and Boyle 1997; 1997 data (Wu and Boyle, unpublished).
Bermuda
D. strigosa
Southern Preserve
North Rock
80
60
40
20
0
1880
1900
1920
1940
1960
1980
Pb/Ca, nmol mol
_
1
Figure 5 Pb in corals near Bermuda in annually laminated layers deposited between 1880 and 1997 (Shen and Boyle, 1987).
ANTHROPOGENIC TRACE ELEMENTS IN THE OCEAN 277