Helo June 15
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Helo June 15 |
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| Helo photo flight | ||||
| June 15, 1998 10:47-12:20 | ||||
| Flight #4 | ||||
| Instruments flown: video, Nikon, KT-19 | ||||
| On board: Don, Tom, Bonnie, Serge Arsenault (pilot) | ||||
| Standard large box with ship at center, 108 nm total | ||||
| camera 1/1000s, f4.0, 50 mm lens, focus infinity | ||||
| interval 21 s (pulse duration=0.1 s, timing= 20 s) | ||||
| Kt 19 sampling rate 1 Hz | ||||
| altitude 6000' entire flight- except additional leg at end at 1000' | ||||
| Brilliantly clear - but StCu deck to the west | ||||
| GPS: | Lat. | Long. | Heading | |
| SHIP | 77 08.80 N | 166 15.3 W | ||
| A | 77 08.80 N | 165 14.6 W | 90 | |
| B | 77 22.3 N | 165 14.6 W | 0 | |
| C | 77 22.3 N | 167 16.0 W | 270 | |
| D | 76 55.3 N | 167 16.0 W | 180 | |
| E | 76 38.50 N | 166 15.3 W | 90 | |
| TIME | NOTES | NIKON | VIDEO | KT-19 |
| 10:47:50 | Off the deck, brilliantly clear | |||
| 10:47:30 | switched on | Kt-19 switched on | ||
| 10:54:36 | line begins, 6200', gr sp=107kn | switched on | 7:27 min elapsed | Polycorder 1 switched on |
| ponds have high spatial variability, some floes show a lot but some do not | ||||
| no clouds great visibility - small pans from 8.5 - 11.5 | ||||
| then over some huge aggregate floes | ||||
| 10:59:20 | 6 nm / 4 min till A | |||
| lots floes with melt, plenty w/ no melt though | ||||
| 11:03:47 | A: start turn, just past lg N-S lead system | 16:35 elapsed time | Poly 1 switched off at beginning of turn | |
| 11:03:50 | big floe at end of line with lots of puddles | |||
| 11:04:25 | A: turn complete | 16:57 elapsed time | Poly 1 switched on after turn complete | |
| Huge floe at 14.5 nm - ground speed 100 kt | ||||
| this leg between lg leads running N-S, over lg floe | ||||
| 11:12:14 | B: start turn | 25:01 elapsed time | Poly 1 switched off at beginning of turn | |
| 11:12:59 | B: turn complete | Poly 1 switched on after turn complete | ||
| FY floes no melt, MY floes lots of melt ponds | ||||
| 11:15:15 | Group of FY floes with no ponds - still snow covered | |||
| 11:21:02 | 13nm before C, 6000' altitude | |||
| In general MY seems more ponded than FY | ||||
| ground speed 99kt | ||||
| 11:23:00 | light clouds below | |||
| 11:24:00 | 8 nm / 5 min before C | |||
| 11:26:00 | approx. where thin clouds below begin to obscure photos | |||
| 11:26:09 | 4.5nm from end of line-photos should be OK but Kt19 will be affected | |||
| 11:26:55 | 5 nm / 3 min before C | |||
| 11:28:45 | C: start turn | 41:35 elapsed time | Poly 1 switched off at beginning of turn | |
| 11:29:24 | Patchy thin clouds underneath - Alt. 6000' - ground speed 82kt | |||
| 11:29:30 | end turn | 42:15 elapsed time | Poly 1 switched on after turn complete | |
| 11:30:23 | CLEAR BELOW- last cloud cover for flt | |||
| 11:32:00 | Polycorder 1 full | |||
| 11:32:45 | Polycorder 2 activated | |||
| 11:33:06 | 21.2nm - out of clouds | |||
| long linear leads - many floes with light or no ponding | ||||
| 11:34:00 | 19 nm to go until the turn, Alt. 6100' | |||
| 11:44:01 | 5.8nm large floe | |||
| 11:44:15 | 5 nm before D | |||
| 11:47:48 | D: start turn | 1:00:35 elapsed time | Poly 2 switched off at beginning of turn | |
| 11:48:28 | D: turn complete | Poly 2 switched on after turn complete | ||
| Alt 6000' ground speed 87kt | ||||
| 11:48:40 | 12.8 nm / 8 min before turn E | |||
| thin ice easy to spot- looks dark | ||||
| 11:55:04 | 3 nm / 2 min before turn E | |||
| 11:56:49 | E: start turn | 1:09:30 elapsed time | Poly 2 switched off at beginning of turn | |
| 11:57:37 | E: end turn | Poly 2 switched on after turn complete | ||
| Ice quite broken up and ponded | ||||
| Large lead system - FY ice breaking into smaller floes - OW approx. isotropic in the horizontal | ||||
| 12:03:00 | 3nm / 1min40sec before ship | |||
| 12:04:53 | F: end of line, OVER SHIP | interval. Off | 1:18:00 elapsed time | Poly 2 switched off |
| 12:12:30 | Begin low pass (nominal 1000') just east of the ship over the camp | Poly 2 switched back on | ||
| 12:12:32 | 1150', 2 mi NE of ship OVER LG LEAD | |||
| 12:15:20 | Over large lead south of ship | 1:28:09 elapsed time | ||
| 12:15:50 | End of low level pass | Poly 2 switched off | ||
| 12:18-19 PM | over station Seattle | |||
| approaching helo deck | switched off | Kt-19 switched off | ||
| 12:20:00 | back on helo deck | |||
| GENERAL IMPRESSIONS & INFORMATION | ||||
| There were some melt ponds with frozen surfaces | ||||
| that were light blue. Lots of open leads and | ||||
| deformation of the leads. | ||||
| More ponds than on the last two flights | ||||
| Between D and E the ice began with relatively little ponding but pond density increased along the line | ||||
| Between D and E FY ice was relatively pond free | ||||
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