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BODC Cruise Metadata Report for RRS Discovery (74E3) cruise D300

Introduction

This report collates information from the BODC cruise inventory and oceanographic databases. It presents

Cruise Inventory Information

Long name RRS Discovery (74E3) cruise D300
Short name D300
Objectives and Narrative The principal objective of the cruise was to assess how biogeochemical composition and flux of OM to the deep-sea floor drives benthic community structure, dynamics and diversity at two sites with contrasting primary production regimes.

Specific hypotheses to be tested:
1. That the variability in biogeochemical composition as well as the total flux of OM reaching the abyssal seafloor is dependent on the productivity of overlying surface waters.
2. That the biogeochemical composition of incoming OM is imprinted on the biochemistry of key detritovores.
3. That key nano-nutrients are critical for the reproduction of some deep-sea species and thus variations in OM flux affect sediment community structure and diversity.
4. That variations in total OM flux also influence benthic rate processes (e.g. faunal activity).

The cruise of RRS Discovery (D300) to the Crozet Plateau in the Southern Indian Ocean to the south east of South Africa was the field phase of the NERC project (NER/A/S/2003/00573) tackling this issue. We focused our studies on two contrasting areas of surface productivity around the Crozet Plateau (Southern Indian Ocean). We adopted an integrated, multidisciplinary approach which involves assessment the OM input to the deep-sea floor (export production), the ambient biogeochemistry of the sediment surface, the benthic community structure and diversity (molecular and morphological approaches), the activity of fish (seabed lander experimentation), the uptake of specific biochemicals by key species and their influence on reproductive processes. Eutrophic and oligotrophic conditions occur in well-constrained areas around the Crozet Plateau, but in close proximity to each other. To the south of the plateau is an oligotrophic High Nutrient Low Chlorophyll (HNLC) zone, typical of the Southern Ocean; to the north, however, is an area where annual blooms of primary production occur consistently, over the same area with the same temporal evolution. The bloom reaches its peak in October or November and collapses back close to the Crozet Plateau by December (Pollard et al., 2002). These eutrophic waters cover a large area despite being embedded within the HNLC zone. The study area is ideal for assessing the impact of changing biogeochemical composition of OM on the benthos because we can compare two communities that are:
1. At the same depth,
2. In the same physical (topographic and hydrographic) setting and
3. Interconnected (there is no physical barrier between them).

The Cruise sailed from Port Elizabeth on 1st December 2005 and docked at Capetown on 14th January 2006.
Ship RRS Discovery
Departure Port Port Elizabeth, South Africa
Departure Date 2005-12-01
Arrival Port Cape Town, South Africa
Arrival Date 2006-01-14
Principal Scientist(s) George Wolff (University of Liverpool Department of Earth and Ocean Sciences)
Responsible Organisation University of Liverpool Department of Earth and Ocean Sciences
Associated Project(s) Crozet
IHB Sea Areas Visited Indian Ocean
Marsden Squares Visited 475
Work Area Description Crozet Islands
Work Area Bounding Polygon 50S,40E; 40S,40E; 40S,50E; 50S,50E; 50S,40E
Southern Limit 50S
Northern Limit 40S
Western Limit 40E
Eastern Limit 50E

Cruise Inventory Datasets

Physical oceanography  
CTD stations Quantity: number of profiles = 10
Description: CTD, full water column for salinity, T, chlorophyll, dissolved O2  
Water bottle stations Quantity: number of profiles = 10
Description: CTD, full water column depth for nutrient analysis  
Chemical oceanography  
Nitrate Quantity: number of profiles = 10
Description: CTD, full water column depth for nutrient analysis  
Nitrite Quantity: number of profiles = 10
Description: CTD, full water column depth for nutrient analysis  
Other chemical oceanographic measurements Quantity: number of profiles = 2
Description: CTD for Helium/tritium analysis  
Oxygen Quantity: number of profiles = 10
Description: CTD, full water column for salinity, T, chlorophyll, dissolved O2  
Oxygen Quantity: number of cores = 9
Description: Cores collected using Megacorer for pore water oxygen measurements  
Phosphate Quantity: number of profiles = 10
Description: CTD, full water column depth for nutrient analysis  
Total - N Quantity: number of samples = 161
Description: Underway samples for nutrient analysis  
Total - P Quantity: number of samples = 161
Description: Underway samples for nutrient analysis  
Trace elements Quantity: number of samples = 160
Description: Underway samples for iron analysis  
Trace elements Quantity: number of samples = 10
Description: SAPS large volume in situ filtration system for particulate iron  
Biology and fisheries  
Benthic bacteria/micro-organisms Quantity: number of cores = 11
Description: Cores collected using Megacorer for determination of bacterial populations  
Biochemical measurements (eg lipids, amino acids) Quantity: number of samples = 4
Description: SAPS large volume in situ filtration system for archaebacterial lipids and proxies  
Biochemical measurements (eg lipids, amino acids) Quantity: number of samples = 10
Description: SAPS large volume in situ filtration system for organic biogeochemistry  
Biochemical measurements (eg lipids, amino acids) Quantity: number of cores = 13
Description: Cores collected using Megacorer for TOC, TN, lipids  
Biochemical measurements (eg lipids, amino acids) Quantity: number of cores = 17
Description: Cores collected using Megacorer for pigment measurements  
Biochemical measurements (eg lipids, amino acids) Quantity: number of cores = 5
Description: Cores collected using Megacorer for Hydrolysable amino acids  
Demersal fish Quantity: number of deployments = 5
Description: ROBIO. RObust BIOdiversity Lander. Time-lapse photography with baited camera system, photographs taken to assess demersal fish populations and activity  
Demersal fish Quantity: number of deployments = 6
Description: FRESP. The Fish RESPirometry Lander. Autonomous baited respirometry trap, video of demersal fish behaviour and in situ measurement of oxygen consumption  
Exploratory fishing Quantity: number of hauls = 6
Description: Benthic Otter Trawls. Collection of invertebrate megafauna and demersal fish.  
Other biological/fisheries measurement Quantity: number of cores = 9
Description: Cores collected using Megacorer for study of polychaete populations  
Other biological/fisheries measurement Quantity: number of cores = 9
Description: Cores collected using Megacorer for study of nematode populations  
Other biological/fisheries measurement Quantity: number of deployments = 5
Description: WASP sea floor photography and video for study of benthic megafaunal populations  
Other biological/fisheries measurement Quantity: number of cores = 9
Description: Cores collected using Megacorer for protozoan meiofauna  
Other biological/fisheries measurement Quantity: number of cores = 13
Description: Cores collected using Megacorer for macrofauna  
Other biological/fisheries measurement Quantity: number of cores = 8
Description: Cores collected using Megacorer for metazoan meiofauna  
Particulate organic matter (inc POC, PON) Quantity: number of profiles = 4
Description: CTD sample, full water column depth for POC and PN  
Pelagic bacteria/micro-organisms Quantity: number of samples = 2
Description: SAPS large volume in situ filtration system for bacterial populations  
Pelagic bacteria/micro-organisms Quantity: number of samples = 2
Description: Bottom water collected for bacterial populations  
Phytoplankton pigs (eg chlorophyll, fluorescence) Quantity: number of samples = 161
Description: Underway samples for chlorophyll analysis  
Phytoplankton pigs (eg chlorophyll, fluorescence) Quantity: number of profiles = 10
Description: CTD, full water column for salinity, T, chlorophyll, dissolved O2  

Cruise Inventory Mooring/Buoy Operations

Latitude Longitude Data type Description
47° 45' S 52° 52' E Biochemical measurements (eg lipids, amino acids) Sediment trap 1973 m, Current meter 1975 m, deployed 6/1/2005 (D285); recovered 26/12/2005
44° 30' S 50° 0' E Biochemical measurements (eg lipids, amino acids) Sediment trap 2000 m, Current meter 2004 m; deployed 20/12/2004, recovered 8/12/2005
46° 0' S 56° 4' E Biochemical measurements (eg lipids, amino acids) Sediment traps 2001, 3195 m Current meters 2003, 3199 m; deployed 26/12/2004, recovered 20/12/2005
49° 0' S 51° 30' E Biochemical measurements (eg lipids, amino acids) Sediment traps 2007, 3183 m Current meters 2010, 3186 m; deployed 3/1/2005, recovered 3/1/2006
49° 0' S 51° 28' E Other biological/fisheries measurement Bathysnap camera system 4202 m; deployed, failed to recover
46° 0' S 56° 7' E Other biological/fisheries measurement Bathysnap camera system 4264 m; deployed 28/12/2004, recovered 1/1/2006
47° 45' S 52° 52' E Particulate organic matter (inc POC, PON) Sediment trap 1973 m, Current meter 1975 m, deployed 6/1/2005 (D285); recovered 26/12/2005
44° 30' S 50° 0' E Particulate organic matter (inc POC, PON) Sediment trap 2000 m, Current meter 2004 m; deployed 20/12/2004, recovered 8/12/2005
46° 0' S 56° 4' E Particulate organic matter (inc POC, PON) Sediment traps 2001, 3195 m Current meters 2003, 3199 m; deployed 26/12/2004, recovered 20/12/2005
49° 0' S 51° 30' E Particulate organic matter (inc POC, PON) Sediment traps 2007, 3183 m Current meters 2010, 3186 m; deployed 3/1/2005, recovered 3/1/2006

Summary of BODC Data Holdings for the Cruise

National Oceanographic Database

Summary

# Series Instrument Description Parameters
23 Acoustic doppler current profiler Acoustic backscatter in the water column
Date and time
Horizontal platform movement
Horizontal spatial co-ordinates
Horizontal velocity of the water column (currents)
Metadata parameters
Raw current meter output parameters
Vertical spatial coordinates
Vertical velocity of the water column (currents)
9 CTD/STD cast Chlorophyll pigment concentrations in water bodies
Date and time
Electrical conductivity of the water column
Reference numbers
Salinity of the water column
Temperature of the water column
Transmittance and attenuance of the water column
Vertical spatial coordinates
1 CTD/STD cast Chlorophyll pigment concentrations in water bodies
Date and time
Electrical conductivity of the water column
Reference numbers
Salinity of the water column
Temperature of the water column
Vertical spatial coordinates
1 Pumped water sample Chlorophyll pigment concentrations in water bodies
Date and time
Horizontal spatial co-ordinates

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

Full List

BODC Reference Instrument Description Date/Time Location  
679556 Acoustic doppler current profiler 2005-12-01 13:56Z to 2005-12-03 11:57Z 33° 55' S to 29° 50' S; 25° 46' E to 31° 10' E Click for more
679568 Acoustic doppler current profiler 2005-12-03 11:59Z to 2005-12-05 11:57Z 35° 28' S to 29° 51' S; 31° 3' E to 37° 58' E Click for more
679581 Acoustic doppler current profiler 2005-12-05 11:59Z to 2005-12-07 11:58Z 41° 22' S to 35° 28' S; 37° 59' E to 46° 8' E Click for more
679593 Acoustic doppler current profiler 2005-12-07 12:00Z to 2005-12-09 11:58Z 45° 5' S to 41° 22' S; 46° 8' E to 52° 43' E Click for more
679600 Acoustic doppler current profiler 2005-12-09 12:00Z to 2005-12-11 11:58Z 46° 0' S to 45° 5' S; 52° 43' E to 57° 0' E Click for more
679612 Acoustic doppler current profiler 2005-12-11 12:00Z to 2005-12-13 11:58Z 46° 1' S to 45° 43' S; 56° 4' E to 56° 57' E Click for more
679624 Acoustic doppler current profiler 2005-12-13 12:00Z to 2005-12-14 11:58Z 45° 54' S to 45° 50' S; 56° 6' E to 56° 27' E Click for more
679636 Acoustic doppler current profiler 2005-12-14 12:00Z to 2005-12-16 11:58Z 46° 4' S to 45° 43' S; 56° 6' E to 56° 57' E Click for more
679648 Acoustic doppler current profiler 2005-12-16 12:00Z to 2005-12-18 11:58Z 45° 56' S to 45° 28' S; 56° 6' E to 56° 50' E Click for more
679661 Acoustic doppler current profiler 2005-12-18 12:00Z to 2005-12-20 11:58Z 46° 1' S to 45° 45' S; 55° 56' E to 56° 25' E Click for more
679673 Acoustic doppler current profiler 2005-12-20 12:00Z to 2005-12-22 11:59Z 45° 56' S to 45° 28' S; 56° 6' E to 56° 45' E Click for more
679685 Acoustic doppler current profiler 2005-12-22 12:01Z to 2005-12-24 05:59Z 45° 59' S to 45° 49' S; 55° 49' E to 56° 27' E Click for more
679697 Acoustic doppler current profiler 2005-12-24 06:01Z to 2005-12-24 10:59Z 45° 52' S to 45° 50' S; 56° 5' E to 56° 10' E Click for more
679704 Acoustic doppler current profiler 2005-12-25 07:59Z to 2005-12-26 11:57Z 47° 38' S to 45° 54' S; 53° 3' E to 55° 55' E Click for more
679716 Acoustic doppler current profiler 2005-12-26 11:59Z to 2005-12-28 11:57Z 49° 12' S to 47° 38' S; 50° 39' E to 53° 3' E Click for more
679728 Acoustic doppler current profiler 2005-12-28 11:59Z to 2005-12-30 11:57Z 49° 15' S to 48° 52' S; 50° 51' E to 51° 27' E Click for more
679741 Acoustic doppler current profiler 2005-12-30 11:59Z to 2006-01-01 11:59Z 49° 13' S to 48° 52' S; 50° 58' E to 51° 31' E Click for more
679753 Acoustic doppler current profiler 2006-01-01 12:01Z to 2006-01-03 12:05Z 49° 8' S to 48° 57' S; 50° 55' E to 51° 42' E Click for more
679765 Acoustic doppler current profiler 2006-01-03 12:07Z to 2006-01-05 12:10Z 49° 7' S to 48° 58' S; 51° 9' E to 51° 15' E Click for more
679777 Acoustic doppler current profiler 2006-01-05 12:12Z to 2006-01-07 12:16Z 49° 1' S to 43° 31' S; 49° 1' E to 51° 55' E Click for more
679789 Acoustic doppler current profiler 2006-01-07 12:18Z to 2006-01-09 12:21Z 43° 28' S to 38° 58' S; 39° 58' E to 48° 58' E Click for more
679790 Acoustic doppler current profiler 2006-01-09 12:23Z to 2006-01-11 12:26Z 38° 57' S to 36° 56' S; 29° 1' E to 39° 52' E Click for more
679808 Acoustic doppler current profiler 2006-01-11 12:28Z to 2006-01-13 13:32Z 36° 55' S to 35° 4' S; 19° 41' E to 28° 54' E Click for more
681407 CTD/STD cast 2005-12-08 17:35Z to 2005-12-08 18:44Z 44° 28' S, 50° 0' E Click for more
681419 CTD/STD cast 2005-12-14 10:19Z to 2005-12-14 11:35Z 45° 53' S, 56° 24' E Click for more
681420 CTD/STD cast 2005-12-11 12:03Z to 2005-12-11 13:19Z 46° 0' S, 56° 15' E Click for more
681432 CTD/STD cast 2005-12-23 22:28Z to 2005-12-23 23:48Z 45° 55' S, 56° 24' E Click for more
681444 CTD/STD cast 2005-12-30 18:00Z to 2005-12-30 19:19Z 49° 10' S, 51° 10' E Click for more
681456 CTD/STD cast 2006-01-03 22:12Z to 2006-01-03 22:52Z 49° 4' S, 51° 13' E Click for more
681468 CTD/STD cast 2006-01-04 21:21Z to 2006-01-04 22:37Z 49° 1' S, 51° 13' E Click for more
681481 CTD/STD cast 2005-12-28 16:23Z to 2005-12-28 17:46Z 49° 3' S, 51° 17' E Click for more
681493 CTD/STD cast 2006-01-06 05:17Z to 2006-01-06 05:29Z 46° 30' S, 51° 55' E Click for more
681500 CTD/STD cast 2006-01-06 11:21Z to 2006-01-06 11:24Z 46° 22' S, 51° 49' E Click for more
1651526 Pumped water sample 2005-12-05 16:16Z to 2006-01-08 09:10Z 49° 3' S to 44° 0' N; 38° 31' E to 57° 0' E Click for more

Project Database

# Events Gear Type Parameters Held
36 Multicorer Concentration of aliphatic hydrocarbons in sediment samples
Sediment lipid concentrations
Concentration of carbohydrates, phenols, alkanols (alcohols), ethers, aldehydes and ketones in sediment
Dissolved oxygen parameters for sediments

Phaeopigment concentrations in sediment
Concentration of alkenones and alkenoates in sediment
Carotenoid pigment concentrations in sediment
Chlorophyll pigment concentrations in sediment
Carbon concentrations in sediment
Nitrogen concentrations in sediment
Inorganic chemical composition of sediment or rocks
13 Stand-alone pumps Water body lipid concentrations
Particulate metal concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Concentration of alkenones and alkenoates in the water column
Concentration of suspended particulate material in the water column
Concentration of carbohydrates, phenols, alkanols (alcohols), aldehydes and ketones in water bodies

Particulate total and organic carbon concentrations in the water column
317 Sample taken from ship's non-toxic supply Salinity of the water column

Chlorophyll pigment concentrations in water bodies
10 CTD frame plus rosette sampler Salinity of the water column

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

References

Track Charts

Track Chart

Reports

Cruise Report