15N
values are tabulated in Table 1.
Figure 1 shows the
stratigraphic relationship between these measurements and the nitrogen isotopic
values of sedimentary organic matter (Olsen, 1997; Paull et al., Chap.
7, this volume).Measured pore-water
ammonium concentrations and 15N
values are tabulated in Table 1.
Figure 1 shows the
stratigraphic relationship between these measurements and the nitrogen isotopic
values of sedimentary organic matter (Olsen, 1997; Paull et al., Chap.
7, this volume).
The uncertainty in the
measured 15N
values of pore-water ammonium (±0.5
)
and sedimentary organic nitrogen (±0.3)
precludes recognition of an isotopic gradient in pore-water ammonium within the
upper 200 m of the sedimentary section. Moreover, no convergence of the nitrogen
isotopic composition of sedimentary organic matter and pore-water ammonium
occurs with increasing depth. Below 200 mbsf, there is a clear disparity between
the 15N
values of nitrogen contained in sedimentary organic and nitrogen composing
pore-water ammonium.
