Appendix C 



Oceanographic Conditions on the Grand 

 Banks During the 1985 IIP Season 



LT I. Anderson, USCG 



Introduction 



TIROS Oceanographic 

 Drifter Tracks 



During the 1985 International Ice 

 Patrol (IIP) season, twelve satellKe- 

 tracked TIROS Oceanographic 

 Drifters (TODs) were deployed in 

 the IIP operating region. Ten of 

 the TODs were deployed from an 

 HC-1 30 aircraft during regular ice 

 reconnaissance flights. The data 

 from these TODs are discussed 

 below. The remaining two TODs 

 were deployed and recovered 

 five times each from the USCGC 

 EVERGREEN as part of an 

 iceberg drift and deterioration 

 study. This is the first time IIP has 

 deployed TODs with the 

 expressed intent of recovery. 

 The tracks of the two ship- 

 deployed TODs are discussed in 

 Appendix D. 



Two oceanographic cmises were 

 planned during the 1985 IIP 

 season. The first cruise was on 

 the USCGC EVERGREEN 

 (WMEC 295) from 1 April until 1 

 May 1985. The objectives of 

 obtaining iceberg drift, 

 deterioration and detection data 

 were met. The results of the 

 EVERGREEN cruise drift data 

 are discussed in Appendix D and 

 the detection data results are 

 discussed in Appendix B. The 

 iceberg deterioration data will be 

 discussed below. The second 

 cruise planned for USCGC 

 NORTHWIND (WAGB 282) was 

 cancelled because of ship's main 

 engine problems. 



56 



IIP uses TODs to provide real time 

 current information to update the 

 historical current field used by our 

 iceberg drift model. TODs are 

 deployed in areas of high iceberg 

 density and in areas of high 

 variability in the current field in 

 order to improve drift prediction. 



All ten of the air-dropped TODs 

 have a 3 meter tong spar-shaped 

 hull withal meter diameter 

 flotation collar and are equipped 

 with a sea suriace temperature 

 (SST) sensor, a drogue tension 

 sensor, and a battery voltage 



Table C-1. 1985 IIP TIROS Oceanographic Drifters 



monitor. Each TOD is deptoyed 

 with a 2 meter by 1 meter 

 window shade drogue attached 

 to the TOD by either a 30 or 50m 

 tether (Table C-1). An average of 

 7.4 positions per day from each 

 TOD were obtained through 

 Service ARGOS. The distribution 

 of the positions and sensor data 

 points are evenly distributed in 

 time except for the period 

 between OOOOZ and 0400Z 

 where virtually no data is 

 received. This null data period is 

 due to the orbits of the 

 NOAA/TIROS N-series satellites. 



Date 

 TOD# Deployed 



Tether Par. Deploy Date Left Aye/ 

 Deployment Position Length Rel. SST IIP Area ^^^ 



4526 10 APRIL 46015.6N 46»28.8W 30M NO -0.8 22 JULY 



4536 7 MAY 45°42.0N 48°09.6W 50M NO -0.6 5 AUG* 



4527 30 MAY 46''34.8N 47'^.8W 30M NO 0.0 17 SEP" 



4537 3 JUNE 47°40.0N 48°00.0W 50M NO 



4548 26 JULY A7°00m 47'17.4W 50M NO 10.2 



4529 28 JULY 48*^1 .ON 46''48.0W 30M NO 10.0 



4550 29 JULY 50°30.0N 50'^9.4W 50M YES 8.3 



4546 10 AUGUST 47''00.0N 47°30.0W 50M NO 



4541 11 AUGUST 48''17.4N 47°00.6W 50M NO 12.6 11 SEP 



4544 26 AUGUST 50°07.2N 50°29.4W 50M YES 8.8 



8 AUG* 

 17 OCT 

 2 OCT 



7.2+ 

 6.4 

 7.1 



7.7 

 7.9 

 7.6 



8.7 

 6.6 



PAR. REL..: Visually confirmed release of parachute at deployment 



+: INCLUDES DATA FROM 3 JUNE ONLY 



*: PICKED UP BY FISHING VESSELS. 4536 HAS BEEN RETURNED TO IIP 

 AND 4548 IN MURMANSK, USSR 



**: TOD FAILED ON 17 SEPTEMBER WHILE IN IIP REGION 

 *": STILL IN IIP REGION AS OF 30 OCTOBER 1 985 



