*2014/03/13 13:41:29.89 *IOS HEADER VERSION 1.10 2011/10/26 2011/10/26 *FILE START TIME : GMT 1980/09/15 01:00:00.000 END TIME : GMT 1980/09/18 21:00:00.000 TIME INCREMENT : 0 1 0 0 0 ! (day hr min sec ms) NUMBER OF RECORDS : 93 DATA DESCRIPTION : CurrentMeter FILE TYPE : ASCII FORMAT : (f7.3,f8.2) DATA TYPE : REAL*4 NUMBER OF CHANNELS : 2 $TABLE: CHANNELS ! No Name Units Minimum Maximum !--- -------------------- --------- -------------- -------------- 1 Speed m/s 0.51E-01 0.463 2 Direction:Geog(to) degrees 95 315 $END $TABLE: CHANNEL DETAIL ! No Pad Start Width Format Type Decimal_Places !--- ------ ----- ----- ------ ---- -------------- 1 99.999 ' ' 7 F ' ' 3 2 999.99 ' ' 8 F ' ' 2 $END $REMARKS Original file name: $END *ADMINISTRATION AGENCY : CANMAR PROJECT : Beaufort Sea Drilling 1980 *LOCATION GEOGRAPHIC AREA : Beaufort Sea STATION : LATITUDE : 70 51.60000 N ! (deg min) LONGITUDE : 129 16.80000 W ! (deg min) WATER DEPTH : 27 *DEPLOYMENT MISSION : n/a TYPE : Ship, Explorer 3 | custom item *INSTRUMENT TYPE : HydroProducts Current Meter MODEL : 950 DEPTH : 12 $TABLE: SENSORS ! Name Abs Depth Serial No ! --------- -------------- ---------- Compass 12 ' ' Speed 12 ' ' $END $REMARKS Instrument depth in metres. $END *HISTORY $TABLE: PROGRAMS ! Name Vers Date Time Recs In Recs Out ! ----------------------- ------ ---------- -------- --------- --------- REMOVECH 2.0 1996/01/08 14:31:03 93 93 CLEAN 1.1 1996/01/08 14:31:20 93 93 CHANGE_CM_CHANNEL_NAMES 1.0 2013/12/12 11:42:27 93 93 CHANGE_HEADER_INFO 1.0 2014/03/13 13:41:29 93 93 $END $REMARKS -The following CHANNEL(S) were removed from file. temperature -The following CLEAN parameters were used. Reset #RECS, MIN & MAX values in header. $END *COMMENTS Caution: relatively short record; directions limited to 95-315deg. The 1980-1985 Canmar current meter data were extracted from GF3 tape #ASLGF3183001 written by R. Birch of Arctic Sciences Ltd. These current meter data have been edited, checked and processed, under a contract to COGLA (Birch, 1988. Current meter and wind data collected at CANMAR drillships 1980-1986. By Arctic Sciences Ltd., Sidney, B.C., 287 p.). The following documentation was extracted from the GF3 tape. 0 *** CURRENT METER METHODS - 1980 *** 242 0 243 0 NEARLY ALL THE CURRENT DATA FOR 1980 WERE OBTAINED USING HYDROPRODUCT 244 0 MODEL 950 CURRENT METERS. AT EACH SITE A HYDROPRODUCT METER WAS 245 0 SUSPENDED FROM THE DRILLSHIP AT A DEPTH OF 12 METERS. EACH INSTRUMENT 246 0 PROVIDED DIRECT READOUT AT SURFACE OF THE CURRENTS, WHICH WERE LOGGED 247 0 HOURLY. TORSIONALLY RIGID HYDRAULIC HOSE WAS USED SO THAT THE 248 0 ORIENTATION OF THE INSTRUMENT COULD BE FIXED AND DETERMINED AT THE 249 0 SURFACE. THE DIRECTION OF THE VANE WAS THEN MEASURED RELATIVE TO THE 250 0 'IMMOBILE' INSTRUMENT CASING. THUS THE MEASUREMENT OF CURRENT DIRECTION 251 0 WAS NOT DEPENDENT ON A COMPASS WITHIN THE INSTRUMENT, WHICH WOULD NOT BE 252 0 RELIABLE DUE TO THE PROXIMITY OF THE SHIP. 253 0 254 0 THE DIRECTIONAL ACCURACY OF THE MEASURED CURRENTS DEPENDS ON HOW WELL THE 255 0 INSTRUMENTS WERE ORIENTED FROM SURFACE. EVEN IF THIS WAS ACCOMPLISHED 256 0 WITH FASTIDIOUS CARE, THE TRUE REFERENCE BEARING MAY HAVE BEEN IN ERROR 257 0 DUE TO DIFFERENCES IN THE CHART AND ACTUAL MAGNETIC DEVIATION VALUES. THE 258 0 LOCAL MAGNETIC DEVIATION, THE DIFFERENCE BETWEEN TRUE AND MAGNETIC NORTH, 259 0 HAS BEEN SHOWN TO HAVE A DAILY RANGE ON THE ORDER OF 5 DEGREES, AND MAY 260 0 DIFFER SIGNIFICANTLY FROM THAT SHOWN ON THE CHART (STEEN, PERS. COMM.). 261 0 262 0 DUE TO THESE FACTORS, IT IS BELIEVED THAT THE CURRENT DIRECTION DATA 263 0 OBTAINED WITH THE HYDROPRODUCT METERS MAY BE IN ERROR BY AS MUCH AS 30 264 0 DEGREES. 265 0 266 0 ERRORS MAY ALSO HAVE BEEN INTRODUCED DUE TO THE PRESENCE OF THE SHIP AND 267 0 THE BLOWOUT PREVENTER (BOP). THE EXPLORER DRILLSHIPS HAVE DRAFTS ON THE 268 0 ORDER OF 6 TO 7 METERS (TABLE 2-1), AND THEIR EFFECT ON THE CURRENTS AT 269 0 THE 12M INSTRUMENT DEPTH MAY HAVE BEEN SIGNIFICANT. DRILLSHIPS WERE 270 0 GENERALLY ORIENTED TO HEADINGS OF EITHER 300 OR 120 DEGREES, SO A 271 0 PREFERENTIAL FLOW ALONG THIS AXIS MAY INDICATE INTERFERENCE FROM THE 272 0 DRILLSHIP. THE BOP AND WELLHEAD ON THE SEA FLOOR MAY ALSO ALTER THE FLOW 273 0 PATTERN IN THE AREA OF THE DRILLSHIP. 274 0 275 0 MOTION OF THE DRILLSHIP IS TRANSFERRED TO THE CURRENT METERS DUE TO THE 276 0 RIGID COUPLING. THIS WAS KNOWN TO HAVE RESULTED IN ERRONEOUS DATA 277 0 PARTICLARLY WHEN SEAS WERE MOST ROUGH, GENERALLY DURING LATE-SUMMER AND 278 0 FALL. IN 1980 HEAVY ICE HELPED KEEP THE SEAS RELATIVELY CALM AND THE 279 0 SHIP MOTION WAS NOT SIGNIFICANT. 280 0 281 0 A MARSH MCBIRNEY ELECTROMAGNETIC CURRENT METER WAS DEPLOYED FOR A SHORT 282 0 PERIOD AT THE ORVILRUK SITE USING THE SAME MOORING METHOD. 283 !--1--- ---2--- !Speed Directi ! on: ! Geog( ! to) !------ ------- *END OF HEADER 0.206 185.00 0.232 180.00 0.232 195.00 0.257 200.00 0.232 215.00 0.206 235.00 0.180 190.00 0.103 180.00 0.129 185.00 0.154 200.00 0.154 225.00 0.206 225.00 0.206 250.00 0.232 275.00 0.154 265.00 0.232 300.00 0.257 310.00 0.180 315.00 0.180 290.00 0.232 265.00 0.154 270.00 0.103 245.00 0.154 190.00 0.180 185.00 0.154 170.00 0.129 175.00 0.051 260.00 0.051 240.00 0.103 160.00 0.154 180.00 0.319 180.00 0.412 180.00 0.463 180.00 0.463 180.00 0.463 200.00 0.283 200.00 0.206 225.00 0.180 225.00 0.185 180.00 0.129 180.00 0.154 180.00 0.180 175.00 0.232 180.00 0.180 190.00 0.129 195.00 0.232 180.00 0.206 170.00 0.257 175.00 0.206 165.00 0.232 160.00 0.154 140.00 0.129 100.00 0.129 100.00 0.206 95.00 0.180 110.00 0.206 135.00 0.180 156.00 0.206 170.00 0.206 180.00 0.180 170.00 0.180 185.00 0.232 190.00 0.232 170.00 0.206 180.00 0.180 150.00 0.206 170.00 0.232 160.00 0.232 180.00 0.309 180.00 0.257 190.00 0.232 195.00 0.180 200.00 0.180 170.00 0.232 180.00 0.283 180.00 0.309 190.00 0.232 200.00 0.154 200.00 0.129 170.00 0.232 160.00 0.154 130.00 0.180 110.00 0.257 110.00 0.232 140.00 0.309 160.00 0.257 190.00 0.232 210.00 0.257 200.00 0.309 210.00 0.283 180.00 0.283 170.00 0.309 180.00 0.232 180.00