TM_bottle

Data Object bottle_TM_RR

contact PIs:

name	title
Dr Ken Johnson	Principal Investigator
Dr Zanna Chase	Contact

Dataset description

Trace Metal Clean Rosette bottle hydrographic and nutrient data

Acquisition description

 dates:           11 January 2002 to 10 February 2002  (20020111-20020210)
 location:        N: -54.093  S: -66.602  W: -172.038  E: -169.242 
 project/cruise:  SOFeX/RR

Nutrients were run at MBARI on an Alpkem RFA.
Some vials thawed during transit and produced bad numbers; these have been excluded

Processing description

Change history: YYMMDD
   060110: downloaded original TMR CTD cast data from SOFeX project data web site;
           added to OCB database by Cyndy Chandler, OCB DMO, (cchandler@whoi.edu);
           all units information taken from original .xls file;

10 January 2006: Prepared for OCB data system by Terry McKee (PO Dept, WHOI) and Cyndy Chandler, OCB DMO (WHOI).

The TM_bottle data object was prepared from an excel file of merged CTD and nutrient data file for the MBARI TM Rosette on Revelle.
Contact Zanna Chase (zanna@mbari.org) with questions about the original data.
original file: was downloaded in December 2005 from the SOFeX data web site:
merged_TM_CTD_nut.xls

Note: cond units are S/m;
Temp is T90 (ITS-90 scale confirmed from .btl file);
Potemp is also T90;
PO4, Si, NO3 and NO2 are all uM, micromolar

The event number, date, time, latitude and longitude position information were taken from the CTD header records. For TMR1 station 7, the latitude may have been entered incorrectly during data acquisition (55 °W) but was not changed to be consistent with the cruise Activity Log (56 °W).

Final TMR-CTD station *.btl file header record showing history of processing steps:
TMR-CTD station 7

MATLAB data processing scripts:
Physical properties of seawater function was used to compute potential density:: PhyPropSW sw_pden.m

Field Names List

Parameter	Description	Units
event	unique sampling event composite of date and time	YYYYMMDDhhmm
date	date sampling began	YYYYMMDD
time	time sampling began	hhmm
lon	longitude, negative denotes West	decimal degrees
lat	latitude, negative denotes South	decimal degrees
sta	station identifier	dimensionless
bot	TM Rosette bottle number	dimensionless
depth	depth, calculated from pressure	meters
press	pressure, from CTD Strain Gauge	decibars
temp	temperature, from CTD, ITS-90	degrees Celsius
sal	salinity, from CTD, PSS-78 (PSU)	dimensionless
sigma_0	sigma theta (potential density) (from primary T0,C0 sensors)	kilograms/meter^3
potemp	potential temperature, ITS-90 (from primary T0,C0 sensors)	degrees Celsius
cond	conductivity, from CTD (from primary C0 sensor)	S/m
fluor	fluorescence, from CTD profiler	V ?? voltage
PO4	Phosphate	microMolar
Si	Silicon	microMolar
NO3	Nitrate	microMolar
NO2	Nitrite	microMolar

Platforms List

R/V Roger Revelle DRFT08RR

Instruments List

Trace Metal Bottle:

This document is created from the content of the BCO-DMO metadata database. 2009-11-22 09:46:12

info app: /home/ocb/dbase v.090827 CLC
Data URL: http://ocb.whoi.edu/jg/serv/OCB/SOFeX/Revelle/TM_bottle.