Cruise 
Name of cruise

unitless 
cruise_id 
Sample 
Sample name

unitless 
sample 
Cycle 
Lagrangian Experiment Number

unitless 
exp_id 
Date 
Date of collection and incubation

unitless 
date_local 
Cast 
CTDNiskin rosette cast number

unitless 
cast 
Lon 
Longitude

decimal degrees 
lon 
Lat 
Latitude

decimal degrees 
lat 
Depth 
Depth

meters (m) 
depth 
Light_Level 
Percent surface irradiance

percent (%) 
irradiance 
T 
Duration of Incubation in decimal hours

hours 
time_elapsed 
Sigma_T 
Estimated measurement uncertainty (sigma, σ) for duration

hours 
time_elapsed 
P 
PON, Particulate organic nitrogen (final)

micromoles of nitrogen per liter (µmol N L1) 
PON 
Sigma_P 
Estimated measurement uncertainty (sigma, σ) for PON

micromoles of nitrogen per liter (µmol N L1) 
PON 
Ip_T 
Ip(T), Isotope ratio of PON (final)

atom percent (%) 
unknown 
Sigma_Ip_T 
Estimated measurement uncertainty (sigma, σ) for Ip(T)

atom percent (%) 
unknown 
Ip_0 
Ip(0), Isotope ratio of PON (initial)

atom percent (%) 
unknown 
Sigma_Ip_0 
Estimated measurement uncertainty (sigma, σ) for Ip(0)

atom percent (%) 
unknown 
I_spk 
Isotope ratio of tracer spike

atom percent (%) 
unknown 
Sigma_I_spk 
Estimated measurement uncertainty (sigma, σ) for I_spk

atom percent (%) 
unknown 
I_amb 
Isotope ratio of ambient ammonium

atom percent (%) 
NH4 
Sigma_I_amb 
Estimated measurement uncertainty (sigma, σ) for I_amb

atom percent (%) 
NH4 
N_spk 
Final concentration of tracer spike. [N]spk

micromoles of nitrogen per liter (µmol N L1) 
unknown 
Sigma_N_spk 
Estimated measurement uncertainty (sigma, σ) for [N]spk

micromoles of nitrogen per liter (µmol N L1) 
unknown 
N_amb 
Ambient nitrate concentration

micromoles of nitrogen per liter (µmol N L1) 
NO3 
Sigma_N_amb 
Estimated measurement uncertainty (sigma, σ) for [N]amb

micromoles of nitrogen per liter (µmol N L1) 
unknown 
a 
Assumed ratio of regeneration to uptake

dimensionless 
unknown 
Sigma_a 
Estimated measurement uncertainty (sigma, σ) for "a" (Assumed ratio of regeneration to uptake).

dimensionless 
unknown 
L10KS 
Assumed log10(halfsaturation constant)

micromoles of nitrogen per liter (µmol N L1) 
unknown 
Sigma_L10KS 
Estimated measurement uncertainty (sigma, σ) for L10KS

micromoles of nitrogen per liter (µmol N L1) 
unknown 
Nitrate_Uptake 
Nitrate Uptake

nanomoles of nitorgen per liter per hour (nmol N L1 h1) 
unknown 
Sigma_Nitrate_Uptake 
Propagated measurement uncertainty (sigma, σ) for nitrate uptake

nanomoles of nitorgen per liter per hour (nmol N L1 h1) 
unknown 