Description of MOCE 5 SeaBird CTD and Station Data

Two classes of data are reported. Vertical CTD profiles of water column properties and water analyses for particulate materials. In addition to making particulate analyses from CTD rosette bottles, we also report those data from samples taken from the ships sea chest during long-track horizontal profiles and while on station. First the CTD downcast profile data is described, then the CTD upcast bottle data and lastly the TSM/POC/PON data taken from the ships seachest while on station.

CTD Downcast Data
Symbol units Description
Salin PSU Seawater salinity in Practical Salinity Units,PSU (numerically equivalent to g/kg)
Temp °C In situ seawater temperature in Celsius
Pres dbar Pressure in decibars (numerically equivalent to depth in m)
Oxy ml/l Dissolved oxygen in ml/l determined by oxygen electrode
Fl680 rfu In situ chlorophyll fluorescence at 680 nm in relative fluorescence units (rfu), MLML Fluorometer
Fl670 rfu In situ chlorophyll fluorescence at 670 nm in relative fluorescence units (rfu), Chelsea Fluoromter
JulDay Julian Day of the Year
GMT Hours Greenwich Mean Time in decimal dours
Sigma g/l Potential seawater density anomaly based on potential temperature in grams per liter
GeoPot dynamic meters Geopotential anomaly (dynamic meters)
Theta °C Potential temperature, ITS-90 (°C)
% OxySat % Oxygen saturation percentage is 100 x the ratio of observed oxygen concentration to the oxygen solubility
c660 1/m The total attenuation coefficient in m-1 measured by a C-Star 25-cm transmissometer at 660 nm


CTD Upcast Bottle Data
Symbol units Description
Btl# # Bottle number from which sample was drawn
Btime Hours GMT time the bottle was tripped
CTD_S PSU Seawater salinity in Practical Salinity Units (numerically equivalent to g/kg).
CTD_T °C Bottle in situ seawater temperature in Celsius
CTD_P dbars Bottle pressure in decibars (numerically equivalent to depth in m)
CTD_O ml/l Bottle dissolved oxygen in ml/l determined by oxygen electrode
CTD_F680 rfu Bottle chlorophyll fluorescence at 680 nm in relative fluorescence units (rfu), MLML Fluorometer
CTD_F670 rfu Bottle chlorophyll fluorescence at 680 nm in relative fluorescence units (rfu), MLML Fluorometer
CTDC660 1/m Bottle total attenuation coefficient at 660 nm in 1/m
CTDwoxy ml/l Bottle oxygen in ml/l determined by Winkler titration
CTDTSM mg/l Total suspended material in milligrams per liter
CTDTSMV l Volume filtered in liters for the determination of TSM
CTDPOC µg/l Particulate Organic Carbon in micrograms per liter
CTDPON µg/l Particulate Organic Nitrogen in micrograms per liter
CTDPOCV l Volume filtered in liters for the determination of POC and PON
CTD_C/N Molar Carbon to Nitrogen Ratio
CTD_OM µg/l Organic Matter
CTD_%OM % Percent Organic Matter
Total Suspended Material and Particulate Organic Carbon and Nitrogen samples taken from the ship's sea chest
Symbol units Description
Date YYMMDD The GMT date the sample was collected in the format YYMMDD, where YY is the 2 digit year, MM is the month and DD is the day.
Time Hours and Minutes GMT time sample was collected in the format HH.MM, where HH is the hour and MM is the minutes.
Latitude DD.MMm Latitude in DD.MMm were DD is degrees and MMm is decimal minutes. North is positive and South is negative.
Longitude DD.MMmm Longitude in DD.MMm were DD is degrees and MMm is decimal minutes. East is positive and West is negative
Depth m Depth of sample collected, ship sea chest is 5 meter, bucket samples are 0 meters
TSM mg/l Total Suspended Material
Vol l Water filtered for Total Suspended Material
POC µg/l Particulate Organic Carbon
PON µg/l Particulate Organic Nitrogen
Vol l Water filtered (l) for POC and PON
OM µg/l Organic Matter
%OM % Percent by weight of organic matter in TSM
C/N ratio Molar Carbon to Nitrogen Ratio