RRS Charles Darwin CD176

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS Charles Darwin (74AB)

Cruise identifier

CD176

Cruise period

2005-10-06 — 2005-11-01

Status

Completed

Port of departure

Birkenhead, United Kingdom

Port of return

Falmouth, United Kingdom

Purpose

Research

Objectives

The principle objective of the cruise was to undertake the sampling of the Extended Ellett Line a section of CTD and biochemical monitoring stations that run from Ardnamurchan Point in Scotland to Rockall and on to Iceland, ending close to the volcanic island of Surtsey. Secondary objectives included making trace metal observations with a view to i) an investigation of circulation in the Rockall Trough and ii) researching the limiting role of iron in biological production in the Iceland Basin, investigating cetacean distributions and undertaking coring activities. In addition the cruise provided training and data for 5 PhD students on board and one, Clare Johnson, who was unable to join the ship. The Ellett Line is a vitally important section that provides data to monitor the state of the North Atlantic. In all 66 oceanic CTD stations were occupied. Although a significant amount of downtime was encountered - mainly due to bad weather - the cruise was nevertheless very successful. It completed the section from Scotland to Rockall, an ADCP mooring was laid in the gully leading away from the Wyville Thomson Ridge (the Ellett gully) which was mapped in detail; iron incubation measurements were made with water from the Iceland Basin; a large number of sperm whales and dolphins were heard in the Rockall Trough; the presence of acorn worms in the muds at the bottom of the Faroe-Shetland Channel was confirmed. In addition nearly all the CTD and underway sensors performed satisfactorily, and in particular the oxygen sensor on the stainless steel CTD performed very well. After much work on a neglected system on board the Charles Darwin the vessel mounted ADCP gave good data. And on the final leg home we carried out a very detailed survey of the water quality just above the Migulay cold water coral reef. Given the potential for bad weather as this time of year a large amount work was achieved. No group achieved all its objectives, but neither did any one come away empty handed

Chief scientist

Toby J Sherwin (Scottish Association for Marine Science)

Project

Northern Seas Programme

Coordinating body

SAMS/NOCS

Cruise report

(2.81 MB)

Ocean/sea areas

General

Inner Seas off the West Coast of Scotland
North East Atlantic Ocean (limit 40W)

Specific

Malin Shelf; Rockall Trough; Rockall Bank; Iceland Basin, Wyville Thomson Ridge, Faroe-Shetland Channel

Track charts

(0.05 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: track kilometres = 3148.4
Description: Continuous underway Sea Temp, Salinity, ADCP, Tranmissometer, Fluorometer

CTD stations

Quantity: number of stations = 66
Description: Continuous profiles of pressure, temperature, conductivity, LADCP (up and down), fluorometer, dissolved oxygen, transmissometer

Chemical oceanography

Oxygen

Quantity: number of samples = 600
Description: Oxygen profiles

Phosphate

Quantity: number of samples = 153
Description: Underway phosphate

Phosphate

Quantity: number of samples = 400
Description: Phosphate profiles

Nitrate

Quantity: number of samples = 153
Description: Underway nitrate

Nitrate

Quantity: number of samples = 400
Description: Combined NO2, NO3 profiles

Nitrite

Quantity: number of samples = 100
Description: Near surface nitrite profiles

Ammonia

Quantity: number of samples = 400
Description: Ammonium profiles

Silicate

Quantity: number of samples = 153
Description: Underway silicate

Silicate

Quantity: number of samples = 400
Description: Silicate profiles

Quantity: number of samples = 400
Description: pH profiles

Other chemical oceanographic measurements

Quantity: number of samples = 153
Description: Underway surface dissolved iron samples

Other chemical oceanographic measurements

Quantity: number of samples = 16
Description: Dissolved iron profiles (Iceland Basin only)

Other chemical oceanographic measurements

Quantity: number of samples = 300
Description: Dissolved and particulate aluminium profiles (E of 15 W only)

Biology and fisheries

Particulate organic matter (inc POC, PON)

Quantity: number of samples = 400
Description: POC profiles

Mammals and reptiles

Quantity: number of deployments = 27
Description: Hydrophones deployed at some CTD stations to detect baleen whales (not in Icelandic waters)

Mammals and reptiles

Quantity: track kilometres = 1500
Description: Acoustic monitoring for sperm whales and dolphins (not in Icelandic waters)

Other biological/fisheries measurement

Quantity: number of experiments = 2
Description: Bioassay incubations involving dissolved Fe, nutrients, Chl A, HPLC, POC, PON, Lugols, FRRF (phytoplankton physiology). Iceland Basin and Rockall Trough

Meteorology

Routine standard measurements

Quantity: track kilometres = 3148.4
Description: Continuous underway Air temp, atmospheric pressure, port and starboard PAR, port and starboard TIR, wind speed and direction

Geology and geophysics

Core - soft bottom

Quantity: number of cores = 3
Description: Box core (Faroe-Shetland Channel)

Core - soft bottom

Quantity: number of cores = 7
Description: Megacore (either side of Wyville Thomson Ridge)

Multi-beam echosounding

Quantity: number of surveys = 4
Description: Swath bathymetry - parts of: Wyville Thomson Ridge, Hatton Bank, Rockall Bank, George Bligh Bank

Moorings, landers, buoys

Physical oceanography

Current profiler (eg ADCP)

60° 14' 21" N 8° 52' 11" W — 1 Broadband ADCP 16 Oct 2005 (Ellett gully ADCP)

Neutrally buoyant floats

61° 15' 42" N 20° 0' 47" W — 1 Argo float 19 Oct 2005

Data held at BODC

Get data

Series/Profiles

1 Acoustic doppler current profiler

Reference numbers
Date and time
Vertical spatial coordinates
Temperature of the water column
Platform or instrument orientation
Vertical velocity of the water column (currents)
Acoustic backscatter in the water column
Horizontal velocity of the water column (currents)
Metadata parameters
Sea level

[Show series]

[Hide series]

BODC id	Date/Time	Location	Doc.
1014459	2005-10-16 15:30 — 2006-05-06 02:00	60° 14' 21" N 8° 52' 11" W

82 Bottle station

Reference numbers
Nitrite concentration parameters in the water column
Vertical spatial coordinates
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Quality control flags
Chlorophyll pigment concentrations in water bodies

[Show series]

[Hide series]

BODC id	Date/Time	Location
2079336	2005-10-12 20:39:18	57° 32' 57" N 12° 59' 50" W
2079404	2005-10-19 04:36:57	62° 20' 1" N 19° 49' 53" W
2079545	2005-10-26 08:12:09	56° 41' 4" N 6° 16' 53" W
1350790	2005-10-08 06:04	57° 3' 16" N 9° 12' 26" W
1350949	2005-10-12 11:52	57° 32' 31" N 12° 51' 58" W
1351013	2005-10-18 12:42	63° 12' 58" N 20° 3' 52" W
1351025	2005-10-18 14:23	63° 18' 59" N 20° 12' 10" W
1351154	2005-10-25 11:32	56° 50' 9" N 8° 20' 2" W
1351210	2005-10-26 04:55	56° 44' 3" N 6° 35' 52" W
2079219	2005-10-11 04:20:05	57° 22' 1" N 10° 40' 5" W
2079268	2005-10-11 22:18:59	57° 29' 29" N 11° 51' 0" W
1350789	2005-10-08 03:35	56° 59' 54" N 8° 59' 59" W
1350821	2005-10-10 13:57	57° 9' 15" N 9° 42' 11" W
1350833	2005-10-10 18:44	57° 13' 52" N 10° 2' 53" W
1350894	2005-10-11 17:50	57° 28' 59" N 11° 31' 58" W
1351086	2005-10-19 14:48	61° 29' 59" N 19° 59' 59" W
1351142	2005-10-25 09:34	56° 54' 58" N 8° 38' 19" W
1351234	2005-10-26 08:12	56° 41' 4" N 6° 16' 53" W
2079256	2005-10-11 17:49:57	57° 28' 59" N 11° 31' 58" W
2079324	2005-10-12 18:41:49	57° 34' 2" N 13° 19' 58" W
2079465	2005-10-25 11:31:35	56° 50' 9" N 8° 20' 2" W
1350986	2005-10-14 12:02	60° 12' 47" N 6° 12' 10" W
2079207	2005-10-10 23:58:39	57° 18' 9" N 10° 22' 52" W
2079220	2005-10-11 08:21:27	57° 24' 1" N 10° 51' 50" W
2079293	2005-10-12 09:01:44	57° 32' 14" N 12° 44' 51" W
2079312	2005-10-12 16:05:37	57° 35' 2" N 13° 37' 59" W
2079533	2005-10-26 07:17:12	56° 42' 30" N 6° 22' 0" W
2079416	2005-10-19 08:58:51	61° 59' 57" N 20° 0' 11" W
2079428	2005-10-19 14:48:30	61° 29' 59" N 19° 59' 59" W
2079441	2005-10-19 18:59:40	61° 15' 8" N 20° 0' 15" W
2079557	2005-10-26 09:38:52	56° 40' 1" N 6° 8' 3" W
1350870	2005-10-11 10:40	57° 26' 59" N 11° 4' 54" W
1350925	2005-10-12 05:40	57° 31' 55" N 12° 37' 14" W
1351129	2005-10-23 15:20	58° 58' 42" N 13° 23' 2" W
1351178	2005-10-25 16:12	56° 44' 5" N 7° 40' 27" W
1351191	2005-10-25 23:02	56° 44' 2" N 7° 19' 53" W
2079176	2005-10-10 13:57:28	57° 9' 15" N 9° 42' 11" W
1350808	2005-10-08 10:07	57° 6' 1" N 9° 24' 51" W
1350962	2005-10-12 18:42	57° 34' 2" N 13° 19' 58" W
1351049	2005-10-18 20:27	62° 54' 57" N 19° 32' 39" W
1351209	2005-10-26 02:13	56° 43' 59" N 6° 59' 57" W
2079152	2005-10-08 06:03:58	57° 3' 16" N 9° 12' 26" W
2079244	2005-10-11 15:16:11	57° 28' 1" N 11° 19' 9" W
2079348	2005-10-18 12:41:30	63° 12' 58" N 20° 3' 52" W
2079373	2005-10-18 16:58:37	63° 8' 28" N 19° 54' 31" W
2079397	2005-10-19 00:10:18	62° 40' 5" N 19° 40' 20" W
2079489	2005-10-25 16:11:36	56° 44' 5" N 7° 40' 27" W
2079490	2005-10-25 23:01:35	56° 44' 2" N 7° 19' 53" W
2079521	2005-10-26 04:55:08	56° 44' 3" N 6° 35' 52" W
1350845	2005-10-10 23:59	57° 18' 9" N 10° 22' 52" W
1350857	2005-10-11 04:20	57° 22' 1" N 10° 40' 5" W
1350869	2005-10-11 08:21	57° 24' 1" N 10° 51' 50" W
1350882	2005-10-11 15:16	57° 28' 1" N 11° 19' 9" W
1350937	2005-10-12 09:02	57° 32' 14" N 12° 44' 51" W
1350974	2005-10-12 20:39	57° 32' 57" N 12° 59' 50" W
1350998	2005-10-16 08:46	60° 14' 58" N 9° 0' 26" W
1351001	2005-10-16 21:49	60° 25' 34" N 8° 14' 37" W
1351105	2005-10-23 11:20	58° 58' 16" N 13° 34' 55" W
1351130	2005-10-23 17:42	58° 58' 59" N 13° 11' 59" W
2079453	2005-10-25 09:33:49	56° 54' 58" N 8° 38' 19" W
2079477	2005-10-25 13:53:49	56° 46' 53" N 8° 0' 4" W
2079508	2005-10-26 02:13:03	56° 43' 59" N 6° 59' 57" W
1350901	2005-10-11 22:19	57° 29' 29" N 11° 51' 0" W
1351050	2005-10-19 00:10	62° 40' 5" N 19° 40' 20" W
1351074	2005-10-19 08:59	61° 59' 57" N 20° 0' 11" W
1351117	2005-10-23 13:17	58° 58' 34" N 13° 27' 13" W
1351166	2005-10-25 13:54	56° 46' 53" N 8° 0' 4" W
2079140	2005-10-08 03:35:10	56° 59' 54" N 8° 59' 59" W
2079188	2005-10-10 18:44:17	57° 13' 52" N 10° 2' 53" W
2079232	2005-10-11 10:40	57° 26' 59" N 11° 4' 54" W
2079281	2005-10-12 02:15:01	57° 30' 32" N 12° 15' 0" W
2079300	2005-10-12 11:52:05	57° 32' 31" N 12° 51' 58" W
2079361	2005-10-18 14:23:10	63° 18' 59" N 20° 12' 10" W
2079385	2005-10-18 20:27:21	62° 54' 57" N 19° 32' 39" W
1350913	2005-10-12 02:15	57° 30' 32" N 12° 15' 0" W
1350950	2005-10-12 16:06	57° 35' 2" N 13° 37' 59" W
1351037	2005-10-18 16:59	63° 8' 28" N 19° 54' 31" W
1351062	2005-10-19 04:37	62° 20' 1" N 19° 49' 53" W
1351098	2005-10-19 19:00	61° 15' 8" N 20° 0' 15" W
1351222	2005-10-26 07:17	56° 42' 30" N 6° 22' 0" W
1351246	2005-10-26 09:39	56° 40' 1" N 6° 8' 3" W
2079164	2005-10-08 10:07:18	57° 6' 1" N 9° 24' 51" W

65 CTD/STD cast

Reference numbers
Transmittance and attenuance of the water column
Dissolved oxygen parameters in the water column
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column
Chlorophyll pigment concentrations in water bodies

[Show series]

[Hide series]

BODC id	Date/Time	Location
896421	2005-10-08 08:09 — 2005-10-08 09:36	57° 6' 1" N 9° 24' 51" W
896537	2005-10-12 04:49 — 2005-10-12 05:26	57° 31' 55" N 12° 37' 14" W
896630	2005-10-15 02:04 — 2005-10-15 02:29	60° 0' 51" N 6° 20' 53" W
896691	2005-10-16 07:55 — 2005-10-16 08:42	60° 14' 58" N 9° 0' 26" W
896838	2005-10-23 17:05 — 2005-10-23 17:38	58° 58' 59" N 13° 11' 59" W
896875	2005-10-25 09:24 — 2005-10-25 09:32	56° 54' 58" N 8° 38' 19" W
896899	2005-10-25 13:46 — 2005-10-25 13:51	56° 46' 55" N 8° 0' 1" W
897018	2005-10-26 04:49 — 2005-10-26 04:53	56° 44' 3" N 6° 35' 52" W
896469	2005-10-11 03:08 — 2005-10-11 04:13	57° 22' 1" N 10° 40' 5" W
896482	2005-10-11 10:12 — 2005-10-11 10:34	57° 26' 59" N 11° 4' 54" W
896734	2005-10-18 14:13 — 2005-10-18 14:18	63° 18' 59" N 20° 12' 10" W
896390	2005-10-08 03:26 — 2005-10-08 03:32	56° 59' 54" N 8° 59' 59" W
896470	2005-10-11 07:50 — 2005-10-11 08:16	57° 24' 1" N 10° 51' 50" W
896549	2005-10-12 08:08 — 2005-10-12 08:47	57° 32' 14" N 12° 44' 51" W
896574	2005-10-12 18:31 — 2005-10-12 18:38	57° 34' 2" N 13° 19' 58" W
896654	2005-10-16 01:45 — 2005-10-16 02:14	60° 17' 21" N 9° 1' 47" W
896678	2005-10-16 05:30 — 2005-10-16 06:12	60° 15' 45" N 9° 0' 37" W
896709	2005-10-16 10:51 — 2005-10-16 11:20	60° 13' 45" N 8° 59' 31" W
896918	2005-10-25 18:29 — 2005-10-25 18:38	56° 49' 14" N 7° 23' 12" W
897043	2005-10-26 07:11 — 2005-10-26 07:15	56° 42' 30" N 6° 22' 0" W
897055	2005-10-26 08:08 — 2005-10-26 08:11	56° 41' 4" N 6° 16' 53" W
897080	2005-10-19 18:03 — 2005-10-19 18:50	61° 15' 8" N 20° 0' 15" W
896445	2005-10-10 17:24 — 2005-10-10 18:43	57° 13' 52" N 10° 2' 53" W
896586	2005-10-12 20:23 — 2005-10-12 20:36	57° 32' 57" N 12° 59' 50" W
896598	2005-10-14 09:31 — 2005-10-14 10:05	60° 12' 57" N 6° 11' 54" W
896629	2005-10-14 23:59 — 2005-10-15 00:29	60° 4' 49" N 6° 19' 16" W
896783	2005-10-19 03:45 — 2005-10-19 04:34	62° 20' 1" N 19° 49' 53" W
896851	2005-10-23 19:45 — 2005-10-23 20:19	58° 59' 58" N 12° 57' 7" W
897079	2005-10-19 13:57 — 2005-10-19 14:38	61° 29' 59" N 19° 59' 59" W
896433	2005-10-10 12:58 — 2005-10-10 13:43	57° 9' 15" N 9° 42' 11" W
896525	2005-10-12 01:17 — 2005-10-12 02:00	57° 30' 32" N 12° 15' 0" W
896550	2005-10-12 11:14 — 2005-10-12 11:41	57° 32' 31" N 12° 51' 58" W
896562	2005-10-12 15:55 — 2005-10-12 16:02	57° 35' 2" N 13° 37' 59" W
896746	2005-10-18 16:29 — 2005-10-18 16:53	63° 8' 16" N 19° 54' 47" W
896814	2005-10-23 12:45 — 2005-10-23 13:05	58° 58' 34" N 13° 27' 13" W
896943	2005-10-25 20:02 — 2005-10-25 20:12	56° 49' 18" N 7° 24' 7" W
896967	2005-10-25 21:40 — 2005-10-25 21:52	56° 48' 17" N 7° 23' 55" W
896980	2005-10-26 00:25 — 2005-10-26 00:31	56° 44' 4" N 7° 10' 4" W
896389	2005-10-07 09:58 — 2005-10-07 10:03	55° 22' 13" N 6° 42' 55" W
896408	2005-10-08 05:44 — 2005-10-08 05:58	57° 3' 13" N 9° 12' 38" W
896457	2005-10-10 22:50 — 2005-10-10 23:41	57° 18' 9" N 10° 22' 52" W
896501	2005-10-11 16:53 — 2005-10-11 17:39	57° 28' 59" N 11° 31' 58" W
896617	2005-10-14 13:53 — 2005-10-14 14:12	60° 17' 57" N 6° 6' 48" W
896722	2005-10-16 21:16 — 2005-10-16 21:44	60° 25' 34" N 8° 14' 37" W
896887	2005-10-25 11:23 — 2005-10-25 11:28	56° 50' 9" N 8° 20' 2" W
896906	2005-10-25 16:06 — 2005-10-25 16:09	56° 44' 4" N 7° 40' 22" W
896992	2005-10-26 02:05 — 2005-10-26 02:11	56° 43' 59" N 6° 59' 57" W
897031	2005-10-26 06:12 — 2005-10-26 06:17	56° 44' 2" N 6° 26' 53" W
897067	2005-10-26 09:29 — 2005-10-26 09:38	56° 40' 1" N 6° 8' 3" W
896758	2005-10-18 19:45 — 2005-10-18 20:20	62° 54' 57" N 19° 32' 39" W
896795	2005-10-19 08:09 — 2005-10-19 08:46	61° 59' 57" N 20° 0' 11" W
896802	2005-10-23 11:00 — 2005-10-23 11:14	58° 58' 16" N 13° 34' 55" W
896826	2005-10-23 14:47 — 2005-10-23 15:14	58° 58' 44" N 13° 23' 4" W
896863	2005-10-25 07:29 — 2005-10-25 07:36	57° 0' 3" N 8° 59' 52" W
896955	2005-10-25 20:53 — 2005-10-25 21:00	56° 49' 15" N 7° 24' 39" W
897006	2005-10-26 03:46 — 2005-10-26 03:49	56° 43' 58" N 6° 44' 47" W
896494	2005-10-11 14:49 — 2005-10-11 15:07	57° 28' 1" N 11° 19' 9" W
896513	2005-10-11 21:15 — 2005-10-11 22:07	57° 29' 29" N 11° 51' 0" W
896605	2005-10-14 11:20 — 2005-10-14 11:55	60° 12' 47" N 6° 12' 10" W
896642	2005-10-15 23:45 — 2005-10-16 00:02	60° 20' 22" N 9° 2' 27" W
896666	2005-10-16 03:38 — 2005-10-16 04:16	60° 16' 41" N 9° 0' 53" W
896710	2005-10-16 12:46 — 2005-10-16 12:58	60° 11' 20" N 8° 57' 40" W
896771	2005-10-18 23:25 — 2005-10-18 23:59	62° 40' 5" N 19° 40' 20" W
896931	2005-10-25 19:18 — 2005-10-25 19:30	56° 49' 31" N 7° 23' 50" W
896979	2005-10-25 22:53 — 2005-10-25 22:59	56° 44' 2" N 7° 19' 53" W

Discrete samples

3 Box core

66 CTD frame plus rosette sampler

Particulate total and organic nitrogen concentrations in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Salinity of the water column
Dissolved oxygen parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Particulate total and organic carbon concentrations in the water column
Chlorophyll pigment concentrations in water bodies

1 Instrument mooring

7 Multicorer

50 Sample taken from ship's non-toxic supply

Salinity of the water column

Resources

RRS Charles Darwin CD176

Cruise summary report

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BODC holdings

EDMED