station 
Station number.

dimensionless 
station 
date 
Month, day, and year of sampling.

mm/dd/yy 
date 
time 
Time, in hours and minutes, of sampling.

HHMM 
time 
lat 
Latitude in decimal degrees North. (Negative values = South).

decimal degrees 
lat 
lon 
Longitude in decimal degrees East.

decimal degrees 
lon 
depth_mixed_layer 
Mixed layer calculated from sigmat using ref depth = 32 m. Mixed layer depth at each station is defined as the closest depth to the surface at which sigma theta is greater by >= 0.03 kg m3 than the value at a reference depth of 32 m (the shallowest depth common to every CTD station) (based on the criterion of de Boyer Montégut et al. (2004)).

meters 
depth_mixed_layer 
sample 
Sample ID number.

dimensionless 
sample 
depth 
Sample depth.

meters 
depth 
temp 
Water temperature.

degrees Celsius ( C) 
temp 
sal 
Salinity.

practical salinity units (psu) 
sal 
oxygen_corr 
Oxygen (corrected).

milliliters per liter (ml/l) 
O2_ml_L 
sigma_t 
Potential density (sigmatheta); calculated from temperature and salinity.

kilograms per cubic meter (kg/m^3) 
sigma_t 
NO3_NO2_mean 
Mean nitrate (NO3) plus nitrite (NO2) concentration of a sample in micromolar units.

micromolar (uM) 
NO3_NO2 
NO3_NO2_stdev 
Standard deviation of the nitrate (NO3) plus nitrite (NO2) concentration of a sample in micromolar units.

micromolar (uM) 
std_dev 
d15N_NO3_NO2_mean 
delta 15N of NO3+NO2. d15N (‰ vs. AIR) is the nitrogen isotopic composition of a sample expressed in delta notation (in units of per mil) relative to atmospheric N2, where delta 15N = {[ (15N/14N)sample / (15N/14N)atmN2 ] – 1} × 1000.

per mil 
unknown 
d15N_NO3_NO2_stdev 
Standard deviation of d15N_NO3_NO2_mean.

per mil 
std_dev 
d18Ocorr_NO3_NO2_mean 
delta 18O of NO3+NO2. d18O (‰ vs. VSMOW) is the oxygen isotopic composition of a sample expressed in delta notation (in units of per mil) relative to Vienna Standard Mean Ocean Water (VSMOW), where delta 18O = {[ (18O/16O)sample / (18O/16O)VSMOW ] – 1} × 1000.

per mil 
unknown 
d18O_NO3_NO2_stdev 
Standard deviation of d18O_NO3_NO2_mean.

per mil 
std_dev 
NO3_mean 
Mean nitrate (NO3) concentration of a sample in micromolar units, measured after nitrite (NO2) had been removed (using the protocol of Granger and Sigman (2009)).

micromolar (uM) 
NO3 
NO3_stdev 
Standard deviation of the nitrate (NO3) concentration of a sample in micromolar units, measured after nitrite (NO2) had been removed (using the protocol of Granger and Sigman (2009)).

micromolar (uM) 
std_dev 
d15N_NO3_mean 
delta 15N of NO3. d15N (‰ vs. AIR) is the nitrogen isotopic composition of a sample expressed in delta notation (in units of per mil) relative to atmospheric N2, where delta 15N = {[ (15N/14N)sample / (15N/14N)atmN2 ] – 1} × 1000.

per mil 
dN15_NO3 
d15N_NO3_stdev 
Standard deviation of d15N_NO3_mean.

per mil 
std_dev 
d18O_NO3_mean 
delta 18O of NO3. d18O (‰ vs. VSMOW) is the oxygen isotopic composition of a sample expressed in delta notation (in units of per mil) relative to Vienna Standard Mean Ocean Water (VSMOW), where delta 18O = {[ (18O/16O)sample / (18O/16O)VSMOW ] – 1} × 1000.

per mil 
d18O_NO3 
d18O_NO3_stdev 
Standard deviation of d18O_NO3_mean.

per mil 
std_dev 
month 
2digit month of year.

mm (01 to 12) 
month 
day 
2digit day of month.

dd (01 to 31) 
day 
year 
4digit year.

YYYY 
year 
ISO_DateTime_UTC 
Date and time (UTC) formatted to ISO 8601 standard, where T indicates the start of the time string and Z indicates UTC.

YYYYmmddTHH:MM:SS.xxZ 
ISO_DateTime_UTC 