~
"I
E
... o
Variability in Export Production Documented by Downward Fluxes and Species Composition
371
50
25
50
70
Equatorial upwelling
N-Guinea Basin
EA2 and GBN3
EA2
150
250
350
EA2
Diatoms
50
25
Coastal upwelling
Cape Blanc
CB1
O~~,L~~~~-L,L~~~~
450 50
Silicoflagellates
70
35
150
250
350
450
04--~~UU~~~~~-.-.--.
O~~LL4L~~~LL~~LU~~
50
150
250
350
16
GBN3
8
450 50
Polycystines
16
8
150
250
350
450
o
04-~~-+-L~~~J,~LrL-~~
Days 50
150
250
350
450 50
150
250
350
450
Boreal I
.----,---------,----.--~
Season.
S
Su
F
W
S
Su
F
W
Fig. 2. Open-ocean versus costal upwelling. Comparison of diatom, silicoflagellate (CB 1 data from Lange et al.
1998) and polycystine radiolarian (data from Boltovskoy et al. 1993, 1996) fluxes in the eastern equatorial Atlantic
and off Cape Blanc (NW Africa). For deployment data see Table 1. X-axis is days after 1 January (Julian days),
starting at day 50 for 19 February and ending at 440 for 16 March (see Table 1 for trap location).