2nd csv file

Designates the AFSC division that collected the samples. Note the REFM division is now the FMA (Observer Program).

month day year.

Year collected.

Date the production age estimates were finished (given to Stock Assessment staff).

RACE vessel code if numeric, or REFM vessel code if alpha.

Cruise number.

Statistical areas in GOA or EBS of catch location.

Northern rockfish=303 or yellowfin sole=140.

Collection number for each specimen. NOTE- Specimen numbers are within cruise, so there can be multiple repeats in sheet.

Code for individual staff member that did the production age estimates.

production age estimates, from growth zone counts.

codes by reader at time of Production ageing. A=Collector error, B=Broken (damaged) otolith,C=Comments on age form,D=Difficult,E=Edge,F=Faint annulus,G=Growth pattern,H=Break and burn problems, I=Chalky otolith, J=Checky, K=Crystallized, L=Unable to age, M=More than 2 otoliths in vial, N=Slow growing fish, O=Fast growing fish, P=Otolith too small for length, Q=Otolith too large for length, S=Thin-sectioned specimen, T=Image taken of otolith,X=Picture perfect otolith pattern

Final_Age

Year collected ? Final_age

Post production ageing, new age estimates from growth zone counts done specifically for 14C study.

codes 1 = Good age, high degree of confidence. 2 = Ok age, slight confidence, some easy choices to make on interpretation. 3 = Difficult age, very little confidence, numerous difficult choices to make on interpretation Fraction used is half way between tabled whole unit values.

codes: 1 = Otolith condition allowed ageing with out problems. 2 = Otolith condition allowed ageing with y slight problems. 3 = Otolith condition allowed ageing with excessive problems, or not at all. If used, a fractional value is half way between tabled whole unit values.

Year collected ? AGE (confirmation by reader A or L).

Birth year used for 14C study calculations. This is the same as column R on samples that were chosen for the 14C study.

Sample assigned by WHOI, NOSAMS for mass spectrometry when measuring the 14C. See: http://www.whoi.edu/nosams/

Date the 14C measurements results were reported to AFSC from WHOI, NOSAMS

Material chemical form. Determines type of analysis methods used at WHOI, NOSAMS.

Type of biological structure. Determines type of analysis methods used at WHOI, NOSAMS.

AFSC specimen ID used at WHOI, NOSAMS., Same as column I

Text description of sample material used at WHOI, NOSAMS.

Chemical analysis process used at WHOI, NOSAMS. HY is acid hydrolysis.

Number assigned by NASAMS for international tracking of 14C measurements.

Measurement of d13C made at NASAMS. Needed for analysis of 14C and radiocarbon age, to correct for isotopic fractionation.

Source of d13 measurements; N MEASURED means measured by WHOI, NOSAMS.

If blank, small sample mass methods were not applied by WHOI, NOSAMS. If yes, small sample mass methods were applied by WHOI, NOSAMS.

Fraction Modern (Fm) is a measurement of the deviation of the 14C/12C ratio of a sample from Modern.

Error in Fm of one sigma.

Radiocarbon age is calculated from the d13C-corrected Fraction Modern according to the following formula: Age = -8033 ln (Fm). >

Is 8033 times the relative error in the Fm. > Modern is defined as 95% of the 14C activity for AD 1950, as defined by the oxalic acid standard, sample activities can be substantially greater than Modern.

Defined as equation in docx file, Where lamda is 1/(true mean-life) of radiocarbon = 1/8267 = 0.00012097, and Yc is year of collection. In this case Yc is the same as Birth year in the following column, AJ.

Same as column S. Used in the above calculation.

Weight of otolith sample material supplied by AFSC, Age and Growth Program to WHOI, NOSAMS.

Recalculation by Craig Kastelle at AFSC, to check for errors.

One sigma error in Delta14C (Delta14C in previous columns)

The 95% confidence interval in the Delta14C value, calculated from the one sigma error.