Readme for file GASEX98-leg2_bottle_data_Version_Sept2020 This file accompanies the Niskin bottle data from leg 2 of GasEx-98. GasEx-98 was a Lagrangian study in an anti-cyclonic ring using SF6 and He-3 as purposeful tracers. The SF6 and He-3 values are thus highly elevated compared to background values. See cruise report: Cruise_Report-GASEX-98 for further details. This file: GASEX98-leg2_bottle_data_Sept2020 is an updated file based on the files GasEx98.csv and gasex98bottleDr.xls. The bottle file is reformatted and some units converted. The file was restructured by Denis Hansell (RSMAS) in Sept 2020 including: -Added column with Expo code: 33RO19980525 and cruise name: GasEx Leg 2 (1998) - It only presents the primary temperature and salinity CTD data rather than primary and secondary CTD sensors. For temperature the average difference was 0.000 ± 0.005 ?C and for salinity it was 0.013 ± 0.002 with the primary being higher. - Added DOC and TDN -Reformatted header with the first row containing parameter name and second line containing units. -Changed default value from -9 to -999 -Added columns with QC flags - Deleted the secondary T and S CTD sensor data Subsequently Rik Wanninkhof and Patrick Mears changed the following in Sept 2020: -Added a column listed as sample number: Station # *100 + niskin positions -Added MeBr, CH3Cl, CH3Br,CH3I, ex 3He [ccSTP/g*10^-16] that was obtained from file gasex98bottleDr.xls -Converted the nutrient concentrations from umol/l to umol/kg by using CTD salinity and a lab temperature of 20 C to determine density (kg/l): e.g. nitrate (umol/kg) = nitrate (umol/l) /density (kg/l) -Converted the oxygen concentrations from umol/l to umol/kg by using CTD salinity and potential temperature to determine potential density (kg/l): oxygen (umol/kg) = oxygen (umol/l) /density (kg/l). Note there was no oxygen sensor on CTD and all values are Winkler analyses. -Converted SF6 data from pptr to f(emto)mole/kg assuming all analyses were performed at lab temp of 20 C. The conversion is 1 pptr = 41.6 fmol/l * 1/density@20C - Included updated DIC data with QCflags. This data which we assume came from PMEL (M. Roberts) has corrections applied ranging from 1 to 7 umol (with the new DIC data being higher) likely because of HgCl2 dilution correction and CRM correction that appears to be applied per cell. Older notes in readme file for previous version Added He-3 # and Alkalinity # on 7/17/98 – Note all Alkalinity values were bad due to degradation during storage and transport to SIO (A. Dickson pers. comm.) so no values are provided GasEx98 Cruise Readme file: June 25,1998 The following files are included on this diskette: 1. GasEx98.csv 2. Units.csv 3. Stations.csv 4. Readme.txt GasEx98.csv contains all bottle data received by the end of Leg 2. It also includes CTD sensor data and 3 computed fields (apparent oxygen utilization - AOU, sigma-theta, and oxygen in micromoles per kilogram). This data is PRELIMINARY only and SHOULD NOT BE USED FOR ANY PURPOSE OTHER THAN REFERENCE WITHOUT THE EXPRESS PERMISSION OF THE P.I. WHO COLLECTED THE DATA. A list of the fields included in the data file along with a description of the field is given in UNITS.CSV. When the field is a measurement, the units are also included. A list of all CTD stations with dates, times, and positions is given in the file STATIONS.CSV. Some of the measurements in the data file have an associated QC field containing a 1-digit number corresponding to a WOCE quality control flag. The meanings of these numbers is given below: 2 Acceptable measurement 3 Questionable measurement 4 Bad measurement 6 Average of duplicate measurements taken from the same bottle 9 No sample drawn Any questions regarding the data should be addressed to: Rik Wanninkhof Atlantic Oceanographic and Meteorological Laboratory 4301 Rickenbacker Causeway Miami, FL 33149 Email: rik.wanninkhof@aoml.noaa.gov