•
0
50
100
! ..
:
150
200
250
Coastal Upwellng
GeoB 1710
20
40
60
POlat Frontal Zone
PS17S6
Soolh Orkney
PS l575
80
00
20 40 60 80 100
2
'"
•
100
~
;r50
•
co
~
: 200
2SO
8
300
Biogenic Barium as a Proxy for Paleoproductivity
357
South- and Cen1ral Atlant.lc
Equatorial Oive G.081117
GlOB 1041
0
to 15 20 00 S to IS :Ill 25
•
50
.0
12
I.
"
400
Soulhern Ocean
Mlillctic Zone
SubontarotlC Zone
PS1768
PS2082
20
30
40
6
10
2SO.~~
Antarctic Continental Margin
Weddell Sea
PSl648
00
60 eo 100
50 t r - - - - - - - j
o
o
Co$monaUi Sea
PSI82'
50
100
1:50
200
50 tt======::;:j
10
... L-__________ ~12~
Fig. 7. Comparison ofpattems of export production (Po,,) in cores from the
equatorial Atlantic to the Atlantic continental margin. Maxima shift from
glacial stages (shaded) in low latitudes
to peak warm stages near the Atlantic
continent. Po,,, values (diamonds)
were computed following the approach of Francois et al. (1995). For
comparison P values calculated after Dymond et~i (1992) are shown in
the cores from the Atlantic continental margin (crosses).