*2017/12/13 11:31:17.78 *IOS HEADER VERSION 2.0 2016/04/28 2016/06/13 IVF16 *FILE START TIME : UTC 2016/08/11 19:10:00.000 END TIME : UTC 2016/08/11 19:10:03.200 TIME INCREMENT : 0 0 0 0 200 ! (day hr min sec ms) TIME UNITS : Milliseconds NUMBER OF RECORDS : 17 DATA DESCRIPTION : CTD NUMBER OF CHANNELS : 6 $TABLE: CHANNELS ! No Name Units Minimum Maximum !--- ------------- --------------- -------------- -------------- 1 Pressure decibar 0.15 4.986 2 Depth metres 0.15 4.988 3 Temperature 'deg C (ITS90)' 15.626 18.97 4 Salinity PSS-78 26.409 27.213 5 Speed:Sound m/s 1499.71 1508.928 6 Density kg/m^3 1018.477 1019.869 $END $TABLE: CHANNEL DETAIL ! No Pad Start Width Format Type Decimal_Places !--- ---- ----- ----- ------ ---- -------------- 1 -99 ' ' 7 F R4 2 2 -99 ' ' 7 F R4 2 3 -99 ' ' 8 F R4 3 4 -99 ' ' 7 F R4 2 5 -99 ' ' 8 F R4 2 6 -99 ' ' 9 F R4 3 $END *ADMINISTRATION MISSION : 2016-98 AGENCY : Canadian Hydrographic Service COUNTRY : Canada PROJECT : CHS CTD Data Acquisition SCIENTIST : Dangerfield N. *LOCATION EVENT NUMBER : 599 LATITUDE : 49 29.48924 N ! (deg min) LONGITUDE : 124 21.07219 W ! (deg min) *INSTRUMENT TYPE : SonTek CTD MODEL : CastAway SERIAL NUMBER : CC1441005 *HISTORY $TABLE: PROGRAMS ! Name Vers Date Time Recs In Recs Out ! ------------- ------ ---------- -------- --------- --------- READ_CHS_CTDS 1.0 2017/12/09 01:49:25 17 17 HDREDIT2 3.1.1 2017/12/13 11:31:17 ? ? $END $REMARKS -READ_CHS_CTDS processing: 2017/12/09 01:49:24 -HEADER EDITS: 2017/12/13 11:31:17 Applied edit header: P:\Cruise_Data_Processing\CHS_data\test\Docs\CHS-ref-HDR.TXT Channel 1: Pressure [decibar] Format: F10.3 ==> F7.2 Channel 2: Depth [metres] Format: F10.3 ==> F7.2 Channel 3: Temperature [deg C (ITS90)] Format: F10.3 ==> F8.3 Channel 4: Salinity [PSS-78] Format: F10.3 ==> F7.2 Channel 6: Density [kg/m^3] Format: F10.3 ==> F9.3 Channel 5: Speed:Sound [m/s] Format: F10.3 ==> F8.2 $END *COMMENTS Data Processing Notes: The CastAway-CTD is a small profiling instrument that measures conductivity, temperature, and pressure. Its embedded firmware controls all of the instrument's functions. It is designed for profiling to depths of up to 100m at 5 Hz. It uses a six electrode flow-through conductivity cell with zero external field coupled with a rapid response thermistor (<5Hz) to attain high measurement accuracies. The instrument does not require a pump and is hydrodynamically designed to free fall rate of 1 m/s. Processing was done using the CastAway CTD data processing system which included the following steps: - Pressure correction to remove ambient atmospheric pressure. - Removal of records obtained while the system was stationary. - De-spiking of conductivity data to remove erratic measurements near the water surface that can be caused by air bubbles trapped in the conductivity flow cell. - Bin-averaging with 0.3db bins with linear interpolation used to fill empty bins or the nearest available value for surface or bottom bins. - Combination of downcast and upcast data using a weighted average based on fall velocity. - Derivation of specific conductance, salinity, sound speed, density and depth for each pressure bin. The data were converted to IOS Header format and some quality control checks were made. Resolution and Accuracy as stated by the manufacturer is: Channel Resolution Accuracy Pressure 0.01 db 0.25 db Depth 0.01 m 0.25 m Temperature 0.01 degrees C 0.05 degrees C Conductivity 1 mS/cm 5 mS/cm Conductance:Specific 1 mS/cm 5 mS/cm Salinity 0.01 (PSS-78) 0.1 (PSS-78) Speed:Sound 0.01 m/s 0.15 m/s Density 0.004 kg/m3 0.02 kg/m3 GPS 10m Density is derived based on temperature resolution and accuracy using the International Equation of State for sea water (EOS-80). Depth and Specific Conductance are derived using the International Equation of State for sea water (EOS-80). Salinity was calculated using the 1978 Practical Salinity Scale. Sound Speed was calculated using the method of Chen-Millero, 1977. Original data file header: % Device,CC1441005,,,, % File name,CC1441005_20160811_191017,,,, % Cast time (UTC),2016/08/11 19:10,,,, % Cast time (local),2016/08/11 19:10,,,, % Sample type,Cast,,,, % Cast data,Processed,,,, % Location source,GPS,,,, % Default latitude,32,,,, % Default altitude,0,,,, % Start latitude,49.4914874,,,, % Start longitude,-124.3512032,,,, % Start altitude,-3.720000029,,,, % Start GPS horizontal error(Meter),1.980000019,,,, % Start GPS vertical error(Meter),3.069999933,,,, % Start GPS number of satellites,8,,,, % End latitude,49.4914903,,,, % End longitude,-124.3511459,,,, % End altitude,-17.35000038,,,, % End GPS horizontal error(Meter),4.46999979,,,, % End GPS vertical error(Meter),8.289999962,,,, % End GPS number of satellites,7,,,, % Cast duration (Seconds),60.2,,,, % Samples per second,5,,,, % Electronics calibration date,0001-01-01,,,, % Conductivity calibration date,2015/01/26,,,, % Temperature calibration date,2015/01/26,,,, % Pressure calibration date,2015/01/26,,,, % ,,,,, For more information about the CastAway CTD see document "CastAway CTD Principles of Operation.pdf”. !--1--- --2--- ---3--- --4--- ---5--- ---6---- !Pressu Depth Tempera Salini Speed: Density !re ture ty Sound !------ ------ ------- ------ ------- -------- *END OF HEADER 0.15 0.15 18.970 26.41 1508.93 1018.477 0.45 0.45 18.830 26.49 1508.62 1018.575 0.75 0.75 18.789 26.47 1508.48 1018.573 1.05 1.05 18.616 26.50 1508.00 1018.632 1.35 1.35 18.531 26.47 1507.73 1018.634 1.65 1.65 18.496 26.48 1507.63 1018.649 1.95 1.95 18.423 26.50 1507.45 1018.687 2.25 2.25 18.284 26.55 1507.10 1018.759 2.55 2.55 18.129 26.55 1506.64 1018.794 2.85 2.85 17.913 26.58 1506.04 1018.872 3.15 3.15 17.698 26.64 1505.46 1018.966 3.45 3.45 17.455 26.71 1504.80 1019.074 3.75 3.75 17.013 26.84 1503.61 1019.279 4.05 4.05 16.529 26.92 1502.21 1019.450 4.35 4.35 16.087 26.96 1500.87 1019.575 4.65 4.65 15.626 27.21 1499.71 1019.869 4.99 4.99 15.647 27.20 1499.77 1019.856