Erlenkeuser and von Grafenstein: Stable Oxvl:en Isotope Ratios in Benthic Carbonate Shells
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Ulptav Sea '93, 94
Transec1 N ; Taimyr to Kotelnyy
~
120
125
130
135
longitude, °E (at latitude 7S,SO N)
,- -I
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56 7 89
Ulpta. Sea '93, '94:
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Transecl L : Buor Khaya Bay nonhward
I ' " I " I ' " I '" I
73
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latitude, O N (at longitude 13 , °E)
77
Lena
exp'd calclle~ 1 80 , outer
SheH (4Om; ·,-SOC; 33.6 psu)
't' - Blvah 1.
.. .. oraminfera
- 13 Elphidium
Ostracoda
-e-- Cytheropleron
- 0 - Heterocyprideis
+- Rabimilis
--tr- Sarsicytheridea
--+- (.ar. speeies)
140
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10 1112
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75
76
77
78
latitude, ON (at longitude 137°E)
Figure 4: Stable oxygen isotope composition of benthic carbonate producers from surface sediment samples
collected Aug.lSept. 1993 and 1994 in the Laptev Sea along transects N, L, and Y (Figure I). Station labels
(numbers) given at the upper margins serve for reference (cf. Figure I). Water depths at the stations are shown
for comparison. The data represent mean values of single shell measurements of variable number. Vital effects
have been corrected for.
distribution of 8180, corrected for vital offsets, with depth along the transects N, L, Y (Figure
5), Station counting along the transects, beginning in the west (transect N) or in the south (L,
Y) is displayed in the digramms and indicates the geographical relation of the stations,
Differences in the mean benthic 8180 between stations of about the same water depth are
evident in transects Nand L. 8180 is slightly lower for the 120 to 125°E stations (no. 3 and 4)
and for stations 8 and 9 in the outer Yana Valley at about 135°E. As an aspect of broader
interest, brine waters may be thought of to form on the shallower southern shelf, flowing off