*2014/03/13 13:41:29.92 *IOS HEADER VERSION 1.10 2011/10/26 2011/10/26 *FILE START TIME : GMT 1980/09/01 16:00:00.000 END TIME : GMT 1980/09/09 14:00:00.000 TIME INCREMENT : 0 1 0 0 0 ! (day hr min sec ms) NUMBER OF RECORDS : 191 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 1.081 2 Direction:Geog(to) degrees 20 360 $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 20.40000 N ! (deg min) LONGITUDE : 136 39.00000 W ! (deg min) WATER DEPTH : 56 *DEPLOYMENT MISSION : n/a TYPE : Ship, Explorer 4 | custom item *INSTRUMENT TYPE : Marsh-McBirney Current Meter 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 ! ----------------------- ------ ---------- -------- --------- --------- CLEAN 1.1 1996/01/08 14:05:03 191 191 REMOVECH 2.0 1996/01/08 14:06:38 191 191 CHANGE_CM_CHANNEL_NAMES 1.0 2013/12/12 11:42:28 191 191 CHANGE_HEADER_INFO 1.0 2014/03/13 13:41:29 191 191 $END $REMARKS -The following CLEAN parameters were used. Reset #RECS, MIN & MAX values in header. -The following CHANNEL(S) were removed from file. temperature $END *COMMENTS 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 0.978 80.00 1.081 85.00 1.030 85.00 0.978 90.00 0.720 91.60 0.463 95.00 0.383 89.00 0.309 80.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.309 45.00 0.309 40.00 0.257 360.00 0.257 30.00 0.257 40.00 0.360 50.00 0.412 50.00 0.412 55.00 0.412 33.00 0.412 40.00 0.412 35.00 0.412 30.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.309 40.00 0.257 55.00 0.103 60.00 0.154 65.00 0.206 65.00 0.309 80.00 0.412 80.00 0.463 85.00 0.360 75.00 0.154 360.00 0.309 25.00 0.257 355.00 0.257 350.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.154 360.00 0.154 350.00 0.154 350.00 0.103 350.00 0.051 310.00 0.103 65.00 0.309 40.00 0.360 25.00 0.309 45.00 0.103 330.00 0.103 305.00 0.051 285.00 0.051 250.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.257 360.00 0.309 20.00 0.360 20.00 0.360 35.00 0.412 60.00 0.463 55.00 0.669 75.00 0.669 75.00 0.515 75.00 0.515 70.00 0.412 65.00 0.412 65.00 0.412 60.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.566 60.00 0.412 35.00 0.360 25.00 0.360 30.00 0.412 35.00 0.515 40.00 0.463 45.00 0.515 55.00 0.412 45.00 0.412 65.00 0.412 60.00 0.360 60.00 0.463 75.00 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 99.999 999.99 0.257 50.00 0.360 60.00 0.463 55.00 0.309 45.00 0.360 70.00 0.515 70.00 0.515 70.00 0.566 75.00 0.566 80.00 0.618 70.00 0.566 65.00 0.412 45.00 0.463 50.00 0.566 50.00 0.515 45.00 0.463 40.00 0.412 35.00 0.412 40.00 0.566 65.00 0.566 70.00 0.566 70.00 0.515 70.00 0.515 70.00 0.463 65.00 0.618 65.00 0.463 65.00 0.412 60.00 0.412 60.00 0.309 85.00 0.309 35.00 0.309 50.00 0.360 60.00 0.463 60.00 0.515 80.00 0.515 65.00 0.412 65.00 0.412 70.00 0.515 75.00 0.489 75.00 0.463 75.00 0.566 70.00 0.566 65.00 0.515 60.00 0.412 70.00 0.412 65.00 0.309 75.00 0.412 70.00 0.360 75.00 0.412 70.00 0.412 70.00 0.412 60.00 0.360 45.00 0.360 45.00 0.360 45.00 0.257 45.00 0.257 35.00