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RRS Discovery Cruise D334, 27 Oct-24 Nov 2008. RAPID Mooring Cruise Report

By S.A. Cunningham

Abstract

This report describes the mooring and underway operations conducted during RRS Discovery cruise D334 between 27 October and 24 November 2008. These mooring operations were completed as a part of the United Kingdom Natural Environment Research Council (NERC) funded RAPID Programme to monitor the Atlantic Meridional Overturning Circulation at 26.5°N. The primary purpose of this cruise was to service the Eastern Boundary and Mid-Atlantic Ridge sections of the 26.5°N mooring array first deployed during RRS Discovery cruises D277 and D278 (SOC cruise report number 53), and serviced in 2005 during RRS Charles Darwin cruise CD177 (NOCS cruise report number 5), in 2006 on RRS Discovery cruise D304 (NOCS cruise report number 16) and FS Poseidon cruises P343 and P345 (NOCS cruise report number 28) and in 2007 on RRS Discovery cruise D324 (NOCS cruise report number 34). Cruise D334 started and finished in Tenerife, Spain and covered the Eastern Boundary and Mid-Atlantic Ridge moorings deployed on D324 and P343. This cruise was the fourth annual refurbishment of the Eastern Boundary and Mid-Atlantic Ridge sections of the mooring array. The array will be further refined and refurbished during subsequent years. The instruments deployed consist of a variety of current meters, bottom pressure recorders, CTD loggers and Inverted Echosounders, which, combined with time series measurements of the Florida Straits current and wind stress estimates, will be used to determine the strength and structure of the MOC at 26.5°N. (http://www.noc.soton.ac.uk/rapidmoc

Topics: GC
Publisher: National Oceanography Centre Southampton
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:66655
Provided by: e-Prints Soton

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Citations

  1. (1949). (on surface) doi
  2. (2008). 015 25.9W (recovery) 0715 Mooring EBH 1 released (recovery) 0748-0837 Recovering
  3. (2008). 0618: first release command sent - inconsistent ranges after release. But many still glum range as was on seabed Actual first release sent : 063930 Rapid Mooring Cruise Report for
  4. 0900 Scientists Join Vessel 1030-1100 Familiarisation of all newly joined Scientific Personnel 1100-30 Emergency and Lifeboat muster and instruction given in our pre-sailing activities – preparing to sail from
  5. 10/11: Revisited and steamed slowly along the deployment track looking for any surface expression.
  6. (2008). 1000: change of drum 1026: wire tangled up around glass floats ~3m in tangle
  7. (2008). 119 Rapid Mooring Cruise Report for D334 – October –
  8. 1200 Making ready mooring MAR1 (deployment) 1224-1637 Deployment of Mooring
  9. (2008). 15 C r u i s e R e p o r t R R S D i s c o v e r y C r u i s e doi
  10. (2008). 151 Appendix F Mooring Recovery Logsheets
  11. (0032). 31/10/08 0014 Hove to on
  12. (2008). 42 Station number (CBOT-CCTD) [mS/cm] Mean (CBOT-CCTD) [mS/cm] Std. Dev. (CBOT-CCTD) [mS/cm] (P>2500dbar) Mean (CBOT-CCTD) [mS/cm] (P>2500dbAR)
  13. (2008). 44 Item Weight in water (kg) Weight in air (kg) Frame 174.4 200 SBE CTD, pinger and altimeter 24 37.5 Niskin bottle (full) 1.3 10.8 8mm wire / 1000m 226
  14. (2008). 6.2.1 Instruments by Mooring Instrument type Manufacturer and model Total intended for recovery Total recovered Total lost Total deployed CTD Seabird
  15. (2008). 69 Figure 16.1a Time series of underway salinity measured with the salinometer compared with bottle data. Figure 16.1b Calibration coefficient deduced from linear fit. Figure 16.1c Salinity after calibration.
  16. (2008). 72 Figure 17.1 The file ebp1_1_200564_136.use.tt.eps, showing the raw and 2-day low-pass filtered hourly median travel times. 17.2 File Telemetry at EBP2_1_200565
  17. (2008). 8 Name Institute Rank Stuart Andrew Cunningham NOCS PS Maria Paz Chidichimo MPI Ph.D. Student Damien Guy Daniel Desbruyeres
  18. (2008). 94 Fig. doi
  19. (2001). and Huntley and Whitehall (Proceedings of Oceans
  20. appears to have kept fouling clear of bottom of release
  21. (2008). Arrive Santa Cruz de Tenerife, Tenerife on Monday 24 th doi
  22. (2008). Attempted communication with MAR1, no comms were established, we tried the release command but to no avail, whilst we were there we tried communication with MAR2 and this was successful, we headed for MAR2 and got good comms straight Rapid Mooring
  23. bottom pressure recorder, BPR, CTD, cruise D334 2008, current meter, Discovery, North Atlantic, moorings, RAPID, RAPID-MOC, RAPID-WATCH, THC, thermohaline circulation, mooring array,
  24. (2008). Built up glass for EBHI and EB1. CTD build completed, initial tests ok. 28 th
  25. (2008). COMMENTS Wd =175 Target 27 54.63’N 13 21.57’W Rapid Mooring Cruise Report for
  26. Conductivity anomaly for instruments on EBHi Rapid Mooring Cruise Report for
  27. (2008). Cruise Report for
  28. (2008). Deployed MAR1 and deployed MAR2, no problems encountered, recovered MARL3, all went well. 9
  29. (2008). deployed the mini moorings EBM1, 4, 5 and 6. 21 st
  30. (2008). Due to this problem and a recommendation from the University of Hawaii in the CODAS documentation for not using PRDID as the secondary heading, a fix was Rapid Mooring Cruise Report for
  31. (2008). Enable pump on / pump off commands: NO --------------------------------------------------------------------- Rapid Mooring Cruise Report for
  32. (2008). Figure 12.1 Picture shows a PES fish on deck; the crane in the background holds the fish actually deployed on this cruise; ship's speed when taking picture about 10 knots; 10m of wire below sea surface. Rapid Mooring Cruise Report for
  33. (2008). Figure 14.6 A section showing the meridional velocity (cross-track velocity) to and from the MAR. Baroclinic agreement between the two sections is good. However there does appear to be a barotropic offset to the data. Rapid Mooring Cruise Report for
  34. (2008). Figure 18.3 Example mooring ‘info.dat’ file Rapid Mooring Cruise Report for
  35. (2008). Figure 18.4 Example output postscript figure depicting measurements of pressure for all MicroCATs participating in a CTD cast. As produced by the mc_call_calib2_noCTD.m script Rapid Mooring Cruise Report for
  36. (2008). Figure 4.2 Schematic of the Eastern Boundary mooring array as deployed for
  37. Figure 4.3 Schematic of the Mid-Atlantic Ridge mooring array for 2007-2008 4.6 Western Boundary Sub-array
  38. (2008). Figure H.1 Chart of the mooring deployment locations during D334. Rapid Mooring Cruise Report for
  39. (2008). Full serial number on light not readable Rapid Mooring Cruise Report for
  40. glasses tangled on chain; polyester slighty wrapped around; cleared with shaking glasses with crane end manually.
  41. Instrumentation deployed on the NOG mooring, (2008/27) Two sediment traps SN’s 11262-06 and 11262-07. Two current meters (RCM 11), SN’s 423 and 419.
  42. (2008). InterOcean S4A — serial number 35612565 Header MAR3_2008 On time 1 min Cycle time 30 min Average count 120 Channels at average Hx, Hx, cond., temp., depth Rapid Mooring Cruise Report for
  43. its descent and settling.
  44. iv: mc_call_calib2_noCTD was run to convert the MicroCAT ascii data files into ‘rodb’ format by calling the ‘microcat2rodb_2’ routine.
  45. (2008). Light flashing in sunlight. Design feature – Pswitch 1020: about 10m of rope tangled 1026: about 10m of badly tangled rope,
  46. (2008). Made up glass for MAR2, MAR1 and MARL3.
  47. (0830). Mooring EBHi being prepared for deployment.
  48. (2008). National Oceanography Centre, Southampton, 189pp. (National Oceanography Centre Southampton Cruise Report, No. 38) ABSTRACT This report describes the mooring and underway operations conducted during
  49. (2008). On time 1 min Cycle time 30 min Average count 120 Channels at average Hx, Hx, cond., temp.,
  50. (2008). One distinct advantage in the CODAS processing route is the gautoedit processing tool which includes built in automatic editing. Rapid Mooring Cruise Report for
  51. Pilot embarked 0908 Vessel cleared berth 0924 Pilot disembarked 0930 Vessel clear of port limits and full away
  52. Position Deployment Date Julian Day GMT Mooring NMFD mooring number Cruise Lat °N Long °W Argos
  53. (2008). Re-locating to a suitable CTD site.
  54. releasing anchor took about 20 minutes to resolve this 13:56 Anchor Towed onto deployment position 14:37:29
  55. (2008). Relocating and stopping at CTD site 2112-0038
  56. (2008). Report for doi
  57. Sampling between casts 0149-0531 Station 07– CTD cast to 4500 m 23 53.4N 041 07.5W 0531-0700 relocating to the NOG sediment trap mooring (recovery) 0700 Hove to at NOGST site 0843
  58. (2006). Scale factor 15.000 Offset 0.000 ---------------------------------------------------------------------Pump Control This setting is only applicable to a custom build of the SBE 9plus.
  59. Seabird SBE53 BPR — serial number 0031 Header MARL3_2008 [sic] Tide interval 30 min Tide measurements duration 30 min Frequency of reference measurement every 96 samples Start date 08/11/2008
  60. (2008). Selected six releases for the 2 CTD casts tonight/early hours of 29 th. 29 th October
  61. (2000). Serial number Approx. depth (m) Recovered ? Date of first useable record Date of last useable record
  62. (2008). Ship’s and Scientific Personnel Name Rank Roger John Chamberlain Master John Woodruff Mitchell
  63. (2008). signal received Rapid Mooring Cruise Report for
  64. site for any surface markers and triangulating moorings MAR1 and MAR2 sea bed anchor positions.
  65. (2008). Started and completed mobilization. 26 th
  66. Station 09– CTD cast to 3500 m 24 15.1N 049 42.0W 0500 Re-locating to the MARL3 site 0830 Mooring MARL3 released (recovery) 0933-1007 Recovering
  67. Station 10– CTD cast to 5500 m 25 06.3N 052 00.9W 1553-1633 Sampling and re-locating to MAR 0 site (deployment) 1633-1718
  68. (2008). Table 1.2 Scientists and Technicians. Principal Scientist (PS), National Oceanography Centre Southampton (NOCS), Max Planck Institute for Meteorology,
  69. (2008). The three releases all worked fine as did the twelve MicroCATs, one of the MicroCATs went down without its blanking plug, but it was fine. 30 th October
  70. (2008). There was a total of two SeaBird SBE37’s (SNs 3941 and 3115), and two LRTs (SNs 245798-003 and 242200-003) lost Rapid Mooring Cruise Report for
  71. (2008). This means several Techsas systems can all be logged on one central Techsas logger, Rapid Mooring Cruise Report for
  72. (2008). to at EB1 – too rough to release, considering our options 23 50.0 N 024 05.9 W 0620-0843 Downtime - weather 0843 set course for mooring EBL1 (recovery) 0909
  73. Total time: 3:26 COMMENTS 1517: switched the drum 1603: messed up wire around it; some 15m doubled; glass floats ok; ~15 min to unwrap cable (not cut); beginning of cable after glasses quite filted.
  74. (2008). Type Location Location Deployed Lat Long Depth Serviced Batts tested tested tested 824
  75. was missing and has been deduced from bathymetry charts.
  76. (2008). We are now conducting a series of CTD casts with the remaining time left of the cruise. 22 nd
  77. (2008). We then deployed a replacement MAR0 with additional MicroCATs, all went well We then readied MARL3 for deployment, eta 13 hours. 10 th
  78. (2008). We then got four mini moorings ready for deployment EBM1, 4, 5 and 6. Rapid Mooring Cruise Report for
  79. (2008). We wound on mooring MAR1 ready for deployment. Continued breaking down and inspecting all of the recovered glass. Started building up Lander MARL4. 3
  80. (2008). We wound on moorings MAR2 and NOG mooring ready for deployment. Made up glass for NOG and some of the glass for MAR2. 4
  81. (2008). Wound on mooring EB1 ready for deployment. Winch operating lever fixed and trialed successfully. 27 th

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