*2020/01/22 11:07:41.96 *IOS HEADER VERSION 2.0 2016/04/28 2016/06/13 IVF16 *FILE START TIME : UTC 1998/08/12 00:00:00.000 NUMBER OF RECORDS : 8 DATA DESCRIPTION : Bottle:Wire FILE TYPE : ASCII NUMBER OF CHANNELS : 8 $TABLE: CHANNELS ! No Name Units Minimum Maximum !--- ---------------------- -------- -------------- -------------- 1 Depth metres 4 50 2 Sample_Number n/a 199472 199479 3 Nitrate_plus_Nitrite umol/L 0 4.7 4 Phosphate umol/L 0.81 1.21 5 Silicate umol/L 3 10 6 Nitrite umol/L 0 0.9E-01 7 Ammonium umol/L 0.4E-01 0.25 8 Oxygen:Dissolved mL/L 8.254 9.429 $END $TABLE: CHANNEL DETAIL ! No Pad Start Width Format Type Decimal_Places !--- ---- ----- ----- ------ ---- -------------- 1 -99 ' ' 7 F R4 1 2 -99 ' ' 7 I I 0 3 -99 ' ' 6 F R4 1 4 -99 ' ' 7 F R4 2 5 -99 ' ' 6 F R4 1 6 -99 ' ' 7 F R4 2 7 -99 ' ' 7 F R4 2 8 -99 ' ' 8 F R4 3 $END *ADMINISTRATION MISSION : 1997-49 AGENCY : 'IOS, Marine Environment and Habitat Science,' CONTINUED : ' Sidney, B.C.' COUNTRY : Canada PROJECT : SHEBA Surface Heat Budget of the Arctic Ocean SCIENTIST : McLaughlin F. PLATFORM : Des Groseilliers *LOCATION GEOGRAPHIC AREA : Canada Basin, Northwind Ridge, Chukchi Plateau STATION : 791 EVENT NUMBER : 791 LATITUDE : 78 48.10200 N ! (deg min) LONGITUDE : 158 48.70200 W ! (deg min) WATER DEPTH : 1200 *HISTORY $TABLE: PROGRAMS ! Name Vers Date Time Recs In Recs Out ! -------- ------ ---------- -------- --------- --------- SPRD2IS 4.1 2004/03/17 15:32:47 8 8 HDREDIT2 1.9 2004/03/19 14:04:49 ? ? REMOVECH 6.0 2004/03/26 14:10:02 8 8 HDREDIT2 1.9 2004/03/26 14:14:41 ? ? CLEAN 4.5 2004/03/26 14:15:35 8 8 HDREDIT2 3.2 2020/01/22 11:07:41 ? ? $END $REMARKS -The following CHANNEL(S) were removed from file. Temperature_CTD_Raw Salinity_CTD_Raw Salinity:Bottle_and_ctd:raw CLEAN functions: - Reset #RECS, MIN & MAX values in header. - Change Pad Value to -99 in All Channels. - Delete Empty Channels: 2 deleted. - Remove Sea-Bird comments from the header. -HEADER EDITS: 2020/01/22 11:07:41 - none. $END *COMMENTS The CCGS Des Groseilliers was frozen into the ice in October 1997 for a one year period. On average CTD profiles were collected every three days (range: 1-14 days) and bottle samples were collected every eight days (range: 1-14 days) using a tripod and winch system mounted in a container located on the ice. After June 1 1998 the top 50 m was sampled by bottle every 2-3 days. A Seabird SBE-19 CTD profiler was used to collect data in the upper 250-650 m of the water column from October 1997 to August 1998; a Seabird SBE-25 CTD was used for the remainder of the program. Both instruments were calibrated before the cruise and processed downcast salinity data were calibrated using bottle salinity measurements. The accuracy of the temperature and salinity data are 0.02 oC and 0.02. The chemistry files cite a reference CTD cast where possible and the chemistry casts were named to match the reference CTD cast. When no CTD cast was available to pair with the chemistry cast, a 1 was added to the end of the cast number (eg. Cast would be named 531 instead of 53 or 1001 instead of 100). This serves to distinguish between casts that have CTD temperatures and salinities associated with them and those that do not. Cast with no reference CTD cast are as follows : 191, 231, 241, 291, 341, 391, 491, 492, 531, 761, 762, 781, 791, 931, 951, 1001. Salinity, nutrients (nitrate plus nitrite, silicate, orthophosphate, nitrite, ammonia), dissolved oxygen, and oxygen isotope samples were collected from the upper 240 m in 5 L Niskin bottles. Salinity was calculated from Guildline Autosal conductivity measurements and referenced to IAPSO standard seawater. Nutrients were analyzed by routine AutoAnalyzer methods (Barwell-Clarke and Whitney, 1996) either one day after collection or frozen and analyzed after a 24-hour thaw. A subset of samples collected in duplicate provided an estimate of precision: Salinity sp =0.02, n=12; nitrate sp=0.05, n=25; silicate sp=0.1, n=25; phosphate sp=0.02, n=26. Dissolved oxygen samples, collected in duplicate, were determined via an automated titration procedure (Knapp et al., 1990; Culberson, 1991) within one day of sampling. The mean coefficient of variation was 0.12 %. The oxygen isotope (18O/16O) ratios of the water samples were analyzed at the Stable Isotope Laboratory, Department of Physics and Astronomy, University of Calgary,Canada. The common CO2-H2O equilibration technique (Epstein, 1953; O'Neil et al., 1975) was used in which millimole quantities of CO2 are equilibrated with water samples under constant temperatures. Subsequently, the CO2 is cryogenically purified and analyzed mass spectrometrically for its 18O/16O ratio. Note that this technique measures the isotopic activity of 18O and not the actual 18O concentration. For dilute waters, differences between isotopic activity and concentration are negligible. For saline waters and brines, however, supplemental water chemistry data and longer equilibration times are needed to obtain true isotopic compositions (Horita, 1993; Sofer, 1972). Accuracy and precision for oxygen isotope ratios of natural waters are generally better than 0.2 ppt (one standard deviation based on n=50 lab standards). !--1--- --2--- --3-- --4--- --5-- --6--- --7--- ---8--- !Depth Sample Nitra Phosph Silic Nitrit Ammoni Oxygen: ! _ te_ ate ate e um Dissolv ! Number plus_ ed ! Nitri ! te !------ ------ ----- ------ ----- ------ ------ ------- *END OF HEADER 4.0 199472 0.0 0.81 3.0 0.00 0.04 9.317 10.0 199473 0.0 0.81 3.0 0.00 0.05 9.366 17.0 199474 -99.0 -99.00 -99.0 -99.00 -99.00 9.395 20.0 199475 0.0 0.83 3.2 0.00 0.07 9.429 30.0 199476 2.8 1.07 8.2 0.09 0.25 8.693 40.0 199477 4.6 1.19 10.0 0.05 0.16 8.304 45.0 199478 4.7 1.21 10.0 0.07 0.09 8.254 50.0 199479 4.6 1.19 10.0 0.08 0.08 8.384