Table 1 Median values (upper line) and interquartile ranges or min and max (lower line) of measured biogeochemical variables in the top centimeter of each station and at 14 to 16 cm bsf (subsurface).

Because of only one replicate for nutrients in the EBS track, no ranges are given. TN, total nitrogen; TOC, total organic carbon; TIC, total inorganic carbon; Chla, chlorophyll a; Phaeo, phaeopigments; NO2, nitrite; NO3, nitrate; NH4+, ammonium; Fe2+, ferrous oxide; TA, total alkalinity.

ParameterUnitReferenceOutsideFurrowRidgeSubsurface
patch
EBS trackSubsurface
X-ray densityHU294314326315384390416
292–296296–328310–339314–326363–385NA392–433
Porosity0.930.930.920.910.920.890.88
0.93–0.930.93–0.930.92–0.920.91–0.920.91–0.92NA0.87–0.88
TNμgN mgSed−11.31.31.31.21.20.91.1
1.2–1.41.0–1.41.2–1.31.2–1.31.1–1.30.9–0.90.9–1.1
TOCμgC mgSed−19.19.18.98.28.39.27.7
9.0–9.48.4–9.98.5–9.57.4–8.38.1–8.48.9–9.47.0–7.8
TICμgC mgSed−100.21.31.656.75.9
0–0.40–0.90.4–3.21.2–1.83.8–5.75.9–7.15.8–7.4
Chlaμg ml−10.090.090.070.040.050.070.02
0.07–0.10.07–0.090.06–0.10.04–0.060.04–0.060.08–0.080.02–0.03
Phaeoμg ml−10.230.210.190.130.170.230.1
0.17–0.250.15–0.270.16–0.230.11–0.140.15–0.190.22–0.240.08–0.11
Chla, relative%26252724232522
24–2923–3022–2822–3122–2524–2718–23
NO2μM1.31.21.20.80.60.20.2
1.3–2.11.0–1.51.1–1.20.4–1.00.6–2.3NA0.2–0.3
NO3μM46.24241.940.242.137.944.8
43.8–50.240.3–42.640.7–42.339.3–73.839.8–43.0NA43.8–72.2
NH4+μM14.612.29.511.18.59.815.2
8.9–40.26.1–16.47.6–12.35.7–12.97.9–16.5NA43.8–72.2
Fe2+μM00.30.200.20.10
0–0.10.2–0.30.14–0.480–0.20.2–0.2NA0–0.1
TAmeq liter−12.12.32.32.22.32.22.4
2.1–2.22.3–2.32.3–2.32.2–2.22.2–2.3NA2.4–2.4