*2021/09/14 08:57:15.89 *IOS HEADER VERSION 2.0 2016/04/28 2016/06/13 IVF16 *FILE START TIME : UTC 2021/05/14 23:49:11.000 TIME INCREMENT : 0 0 0 0.416667E-01 0 ! (day hr min sec ms) NUMBER OF RECORDS : 37 DATA DESCRIPTION : CTD FILE TYPE : ASCII CRC : EFDD4C73 NUMBER OF CHANNELS : 10 $TABLE: CHANNELS ! No Name Units Minimum Maximum !--- ----------------------------- --------------- -------------- -------------- 1 Pressure:CTD dbar 3.4 38.5 2 Temperature:CTD deg_C_(ITS90) 7.2434 10.0627 3 Salinity:CTD PSS-78 26.1065 31.4937 4 Sigma-t:CTD kg/m^3 20.0511 24.6515 5 Transmissivity:CTD:650 %/m 34.1 55.3 6 Transmissivity:CTD:530 %/m 42.8 81.3 7 Oxygen:Dissolved:CTD:Volume ml/l 6.16 7.04 8 Oxygen:Dissolved:CTD:Mass µmol/kg 268.5 308.2 9 Fluorescence:CTD:Seapoint mg/m^3 0.159 1.075 10 PAR:CTD µE/m^2/sec 0.3 873.4 $END $TABLE: CHANNEL DETAIL ! No Pad Start Width Format Type Decimal_Places !--- ---- ----- ----- ------ ---- -------------- 1 -99 ' ' 7 F ' ' 1 2 -99 ' ' 9 F ' ' 4 3 -99 ' ' 9 F ' ' 4 4 -99 ' ' 9 F R4 4 5 -99 ' ' 6 F ' ' 1 6 -99 ' ' 6 F ' ' 1 7 -99 ' ' 7 F ' ' 2 8 -99 ' ' 6 F ' ' 1 9 -99 ' ' 8 F ' ' 3 10 -99 ' ' 7 F ' ' 1 $END *ADMINISTRATION MISSION : 2021-006 AGENCY : IOS, Ocean Sciences Division, Sidney, B.C. COUNTRY : Canada PROJECT : Line P SCIENTIST : Robert M. PLATFORM : John P. Tully *LOCATION GEOGRAPHIC AREA : North-East Pacific STATION : CH18 EVENT NUMBER : 128 LATITUDE : 54 16.42000 N ! (deg min) LONGITUDE : 130 29.39000 W ! (deg min) WATER DEPTH : 42 *INSTRUMENT TYPE : Sea-Bird CTD MODEL : SBE-911plus SERIAL NUMBER : 0443 LOCATION : Mid-ship ! custom item *COMMENTS CTDEDIT was used to remove some near-surface records and a few records corrupted by shed wakes near the bottom of the cast; salinity was cleaned lightly. Data Processing Notes: ---------------------- Transmissivity, Fluorescence and PAR data are nominal and unedited except that some records were removed in editing temperature and salinity. There were 2 WetLabs CStar transmissometers in use during this cruise: Transmissometer:CTD:530 refers to sensor #1883DG (530nm - green) Transmissometer:CTD:650 refers to sensor #1185DR (650nm - red) For comparison with other Institute of Ocean Sciences cruises, note that the transmissometer wavelength is 650 nm unless otherwise stated. NOTE: While the CTD fluorescence data are expressed in concentration units, they do not always compare well to extracted chlorophyll samples, particularly for casts far from shore. It is recommended that users check extracted chlorophyll values where available. The Fluorescence:CTD channel was removed from the CTD files for events 0001 to 0015 due to excessive noise. The problem was resolved when a Y-cable was replaced before event 0016. Data collected during bottle stops looked better, so the channel is included in CHE files. Oxygen:Dissolved:CTD was calibrated using the method described in Sea-Bird Application Note #64-2, June 2012 revision (Sea-Bird_64-2_Jun2012.pdf), except that a small offset in the fit was allowed. The Oxygen:Dissolved:CTD sensor has a fairly long response time so data accuracy is not as high when it is in motion as it is during stops for bottles. This will be especially true when vertical dissolved oxygen gradients are large. To get an estimate of the accuracy of the Oxygen:Dissolved:CTD data during downcasts (after recalibration) a rough comparison was made between downcast Oxygen:Dissolved:CTD data and upcast titrated samples. Much of the difference will be due to problems with flushing of Niskin bottles and/or analysis errors, so the following statement likely underestimates Oxygen:Dissolved:CTD accuracy. Downcast (CTD files) Oxygen:Dissolved:CTD data for this cruise are considered, very roughly, to be ±3% except in areas of very large DO gradients, especially at the base of the mixed layer. For details on the processing see document 2021-006-proc.pdf. !--1--- ---2---- ---3---- ---4---- --5-- --6-- --7--- --8-- ---9--- --10-- !Pressu Temperat Salinity Sigma-t: Trans Trans Oxygen Oxyge Fluores PAR: !re:CTD ure:CTD :CTD CTD missi missi :Disso n:Dis cence: CTD ! vity: vity: lved: solve CTD: ! CTD: CTD: CTD: d:CTD Seapoin ! 650 530 Volume :Mass t !------ -------- -------- -------- ----- ----- ------ ----- ------- ------ *END OF HEADER 3.4 10.0627 26.1280 20.0511 38.1 50.2 7.04 308.2 0.825 873.4 4.0 9.8996 26.1205 20.0700 36.5 47.9 7.03 308.0 0.854 675.4 5.0 9.5167 26.1065 20.1159 36.7 46.8 6.99 305.8 0.831 487.2 6.0 9.4049 26.1832 20.1920 37.8 47.3 6.89 301.8 0.896 308.8 7.0 8.8702 26.7692 20.7258 38.8 48.5 6.87 300.4 1.017 217.5 8.0 8.3888 27.2550 21.1722 35.3 46.2 6.84 299.1 1.075 155.9 9.0 8.0654 27.8006 21.6431 34.1 42.8 6.81 297.8 1.011 110.4 10.0 7.9040 28.2293 22.0006 35.2 44.0 6.79 296.9 0.874 83.8 11.0 7.8105 28.6387 22.3340 37.3 46.7 6.78 296.0 0.755 60.1 12.0 7.7696 28.8283 22.4881 38.8 49.7 6.76 295.2 0.629 43.7 13.0 7.7014 29.1326 22.7359 42.3 51.8 6.73 293.8 0.539 32.4 14.0 7.6504 29.3754 22.9332 44.8 55.8 6.70 292.3 0.475 24.6 15.0 7.5857 29.6584 23.1639 49.3 63.5 6.66 290.9 0.411 18.8 16.0 7.5234 29.9766 23.4220 51.6 69.7 6.63 289.4 0.353 14.4 17.0 7.4820 30.1404 23.5562 53.6 75.4 6.61 288.5 0.315 11.1 18.0 7.4421 30.3597 23.7337 54.8 76.7 6.60 287.8 0.280 8.6 19.0 7.4341 30.4355 23.7943 55.2 78.8 6.59 287.4 0.252 6.9 20.0 7.4291 30.5691 23.9000 55.3 80.3 6.58 287.0 0.239 5.8 21.0 7.4287 30.6338 23.9509 55.3 81.0 6.58 287.0 0.221 5.0 22.0 7.4337 30.7027 24.0043 55.0 81.3 6.58 286.8 0.214 4.4 23.0 7.4521 30.8964 24.1540 51.8 80.3 6.56 285.9 0.197 3.9 24.0 7.4597 30.9248 24.1753 50.5 78.4 6.55 285.7 0.195 3.4 25.0 7.4655 30.9373 24.1844 50.3 75.8 6.55 285.8 0.195 2.9 26.0 7.4667 30.9910 24.2264 49.8 74.3 6.56 285.9 0.186 2.5 27.0 7.4760 31.0364 24.2608 48.6 72.9 6.54 285.3 0.183 2.2 28.0 7.4777 31.1017 24.3119 47.0 71.6 6.51 283.7 0.184 1.9 29.0 7.4507 31.2280 24.4148 42.1 68.1 6.45 281.3 0.171 1.7 30.0 7.4270 31.2630 24.4455 40.5 64.0 6.40 279.1 0.171 1.4 31.0 7.4035 31.3079 24.4839 39.3 59.7 6.37 277.5 0.171 1.2 32.0 7.3894 31.3380 24.5095 38.5 56.7 6.33 275.9 0.164 1.0 33.0 7.3586 31.3765 24.5439 36.2 54.7 6.30 274.4 0.163 0.8 34.0 7.3382 31.3900 24.5573 36.5 52.3 6.27 273.1 0.165 0.7 35.0 7.3275 31.3991 24.5658 37.3 51.1 6.24 272.0 0.165 0.6 36.0 7.3083 31.4192 24.5842 37.7 51.3 6.19 269.9 0.161 0.5 37.0 7.2571 31.4753 24.6352 36.8 51.7 6.16 268.5 0.159 0.4 38.1 7.2443 31.4915 24.6496 35.3 51.4 6.16 268.5 0.159 0.3 38.5 7.2434 31.4937 24.6515 34.5 50.8 6.18 269.3 0.159 0.3