TITLE: 		2002-JOSSO-18

P.I.(S): 	Lee Cooper, Jackie Grebmeier
		10515 Research Dr.
		Suite 100, Bldg. A
		Marine Biochemistry & Ecology
		Dept. of Ecology & Evolutionary Biology
		University of Tennessee, Knoxville
		Knoxville, TN 37932	
		tel:  865.974.2990
		fax:  865.974.7896
		email: lcooper1@utk.edu
		website: http://arctic.bio.utk.edu

FUNDING SOURCE/GRANT NUMBER:
	NSF OPP0125082

DATASET OVERVIEW:
	This dataset contains measurements of the ratios of oxygen-18/oxygen-16 in 
bottle samples of seawater collected from the CTD rosette on two cruises of the 
United States Coast Guard Icebreaker Healy (WAGB-20), May 11 - June 6, 2002, and 
July 19 - August 21, 2002. Samples collected on the Healy were funded through 
the Shelf-Basin Interactions project, which is funded by both the National 
Science Foundation and the Office of Naval Research. For convenience, these data 
are grouped with other bottle data (e.g. nutrients, salinity, temperature, and 
other parameters measured during the cruise), that have been made available on 
the JOSS web page.  Data are expressed in the standard delta notation, where 
d18O = (Rsample/Rstandard -1) x 1000. R= ratio of oxygen-18 to oxygen-16, 
standard = Vienna Standard Mean Ocean Water (V-SMOW), distributed by the 
International Atomic Energy Agency. 

Not all samples that were collected have been, or are likely to be analyzed, due 
to cost constraints. 

INSTRUMENT DESCRIPTION:
	Samples were collected from the rosette and stored in 8 mL vials until 
they were analyzed mass spectrometrically. Vials were typically filled to 
overflowing, capped immediately after collection with a Polyseal cap, sealed 
with Parafilm and stored at a cool temperature. 
	Stable isotope mass spectrometry was accomplished using a Finnigan Delta 
Plus dual inlet mass spectrometer mated to an automated equilibrium system that 
uses the traditional carbon dioxide equilibration method (Epstein and Mayeda, 
1953) for determining the stable oxygen isotope ratios of these two isotopes in 
natural waters. Precision was  0.04 per mille, based upon multiple analyses of 
an internal water sample. Accuracy to the V-SMOW international standard is based 
upon calibration of the internal standards to the international standards, 
including V-SMOW. 

Reference: Epstein, S. & Mayeda, T. Variation of 18O content of water from 
natural sources. Geochimica et Cosmochimica Acta 42, 213-224. (1953).

DATA FORMAT
	File Names (Formats): 	HLY0201-JOSSBe7.txt (Tab delimited text file)
		             	HLY0201-JOSSBe7.xls (MS XL 5.0/95 file)
	NOTE: all of our Excel files will be saved in 5.0/95 version to increase 
accessibility. 
	
	Naming Convention:  CruiseName-"JOSS"Variable.filetype
			(ex. HLY0201-JOSSO-18.txt)
	Data Format and Layout:
		Ship - 	HLY: "Healy", USCG Icebreaker WAGB-20
		Year - 	02 : year, 2002
		Cruise# - 01 : cruise number (either 01 or 03) for the Healy for 
that year
		Station# - sequentially numbered from begining to end of cruise
		Cast - the CTD cast number of that station (also found in the Notes 
of the Event Logs on 			JOSS website)
		SampleNo - same as Bottle
		Bottle - the Bottle number from the CTD rosette
		del O18 - the primary parameter of this file, as described above
		Lat., Long., Date/Time - self-explanatory
		Depth - bottom depth in meters
		CTDPRS - pressure in dbars indicates depth bottle was tripped at
		CTDTMP - water temp at depth of each bottle
		The remaining columns are, in sequence, salinity, oxygen, nitrate, 
nitrite, phosphate, ammonium, Haardt fluorometer voltage, photosynthetic 
radiation, N-star (a derived nutrient tracer), chlorophyll, and phaeopigment 
concentrations as obtained from the JOSS data system.


	Data Version Number and Date: Version 1, 5/23/03

	Software Compatibility: This dataset will be posted in both Microsoft 
Excel 5.0/95 and as a 	tab-delimited text file.