NBP09-01 Cruise Report - British Oceanographic Data Centre

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the sub safe from the major irregularities of the ice base. This mission went according to plan, except thatthe sub detected minimum headroom very early on the northern leg. From the start of the straight leg backto the ice front Autosub followed an undulating course, collecting data on the water column between the icebase and seabed.Mission tracks, as executed are shown in Figure 17 and a summary of each is given in Table 5. Included hereare the test missions, run at the start of operations and following the repairs necessitated by the collision onM431, and the preliminary open water tracks run at the start of each mission as part of the risk mitigationstrategy.NBP09-01 Cruise Report (p. 26 of 83) Revised February 27, 2009
# Starttime, pos,duration, km42742842943043119/1/20091341 GMTS: 74:59.48W: 101:48.236.8 hrs38 km.19/1/20092035 GMTS: 74:59.48W: 101:48.2318.4 hrs101 km23/1/20091544 GMTS: 74 55.9W: 101 50.71 + 3+ 17 hr113 km23/1/20091544S: 74:57.18W: 101:40.7719 hr107 km24/1/20091345 GMTS: 74:52.21W: 101:43.8634.5 hr183 kmPlanComments and FaultsTest Mission to 850 m depth. None critical. Motor appeared to stop andrestart intermittently - fixed for M428. T1on CTD appeared intermittent - connectorscleaned and cable replaced for M428. HotelGround Fault reading high - investigationshowed that source was related to the groundedCTD chassis but no fault found.Sub Ice shelf Mission. Startedwith short (2 hr) test mission, followedby data retrieval and checking.Then AUV run under the iceshelf. 30 km at 200 m const altitude,then turn and 100 m up altitude.2nd run under the PIG. 30 km in.200 m altitude in, and 100 m distanceoff the ice shelf coming out.3rd under ice shelf mission. 30 kmin. 200 m altitude in, and 100 mdistance off the ice shelf comingout.4th under ice shelf mission forPalmer 0901. First 60 km mission.Run 60km in at 100m altitude,turn when got to far waypointor collision avoided and thenrun back at 120m up altitude to30 km point, then profile for theremainder.Mission completed as planned. Good multibeam,CTD, O2, & Transmission data. PoorADCP up profiling range noted.First attempt at mission was unsuccessful becauseshortly after vehicle dived the downADCP misinterpreted a scattering layer at approximately500m as the seabed, causing thevehicle to go to a safe waypoint due to insufficientdepth. To overcome this, we reduced themaximum ADCP range to 440m. Second attemptwas unsuccessful as we were unable tocommunicate acoustically with the AUV due toa faulty crimp joint in the acoustic fish cable.Final mission was successful and completed asplanned.Battery changed before mission. Mission completedas planned.Mission terminated early due to the emergencyexception being called (failed collision avoidance).Consequently, the AUV carried out noprofiling on the way out. The vehicle had, howeverreached 55km under the ice shelf. Vehiclenose section damaged by collision with ice.Port CTD plumbing damaged. Linkquest transducerbulkhead connector damaged (the telemetrysystem was working properly on recovery).continued on next pageNBP09-01 Cruise Report (p. 27 of 83) Revised February 27, 2009
Page 3 and 4: List of Figures1 Regional map of CT
Page 5 and 6: Universities and to Raytheon Polar
Page 8 and 9: 1, 7, 104, and 159. At least one ad
Page 10 and 11: and dissolved oxygen decreasing wit
Page 12: Primary-Secondary O2 sensor differe
Page 15 and 16: Run Test 1 2 3 4 5 6 7 8 9 10 11Stb
Page 17 and 18: In order to estimate the accuracy o
Page 19 and 20: ice-ocean boundary layer. To do thi
Page 21 and 22: Figure 17: Using small boat for rec
Page 23 and 24: Figure 19: Planned mission profiles
Page 25: was under way (Figure 17). This met
Page 29 and 30: S. Jacobs O-274-N Mooring Schematic
Page 31 and 32: at the helm.The high iceberg produc
Page 33 and 34: Seasonal sea ice changes in the Amu
Page 35 and 36: in the Amundsen Sea - (1) the confi
Page 37 and 38: An automated camera system provided
Page 39 and 40: presence of ice layers and wicked b
Page 41 and 42: enough number to be able to regiona
Page 43 and 44: 6 Seafloor MappingFrank Nitsche, Ka
Page 45 and 46: Due to the location of the transduc
Page 47 and 48: Figure 29: Water column thickness (
Page 49 and 50: Figure 31: A south-to-north cross s
Page 51 and 52: phytoplankton from the upper 200m w
Page 53 and 54: uptake (K m ) as well as the maximu
Page 55 and 56: Elmer UV/VIS Lambda 18 spectrophoto
Page 57 and 58: Figure 37: Section plot of dissolve
Page 59 and 60: ligand ’TAC’ (2-(2-Thiazolylazo
Page 61 and 62: Both GA and PA, at times, resulted
Page 63 and 64: 9 Other Sampling and Profiling9.1 O
Page 65 and 66: Figure 42: XBTs gridded as if they
Page 67 and 68: on them. A single hollow column is
Page 69 and 70: in ways that are accessible to a wi
Page 71 and 72: AppendicesACruise ParticipantsPerso
Page 73 and 74: BCTD Station TableNo. Date Time Lat
Page 75 and 76: continued from previous pageNo. Dat
Page 77 and 78:
CPre-cruise Project PlansC.1 Amunds
Page 79 and 80:
Figure 48: Missions, three each, pe
Page 81 and 82:
C.4 Collaborative Research: Samplin
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NBP09-01 Cruise Report - British Oceanographic Data Centre

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