RRS Charles Darwin CD145

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD145
Cruise period2003-03-12 — 2003-04-09
Port of departureMuscat, Oman
Port of returnVictoria, Seychelles
Objectives"Benthic ecology and biogeochemistry of the Pakistan Margin". As the first in a series of four cruises (CD145, CD146, CD150, CD151):
a) Establish a transect of six sites spanning the oxygen minimum zone as it impinges the seabed of the Pakistan Margin;
b) Characterise the water column overlying these sites by CTD profiling and chemical determinations from water bottles;
c) Characterise the seabed around these sites by acoustic remote sensing (12 kHz swath bathymetry, 10 kHz echo-sounding, 3.5 kHz seabed profiling) and photography (video and still images);
d) Detailed seabed sampling of these sites (various corers) to assess a suite of biological and biogeochemical paramters;
e) To assess the medabenthos of the area by trawling and photography.
Chief scientistBrian James Bett (Southampton Oceanography Centre)
ProjectBenthic processes in the Arabian Sea: mechanistic relationships between benthos,
Coordinating bodyNERC, UK
Cruise reportRRS Charles Darwin CD145 cruise report cd145.pdf (2.99 MB) 
Ocean/sea areas 
GeneralArabian Sea
SpecificIndus Margin; Pakistan Margin
Track chartsRRS Charles Darwin CD145 cruise track — cd145track.pdf (0.25 MB) 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 7
Description: Water bottles - various chemical parameters
CTD stationsQuantity: number of stations = 7
Description: CTD casts + 02, transmissometer and fluorometer
Chemical oceanography 
OxygenQuantity: number of stations = 7
Description: CTD casts + 02, transmissometer and fluorometer
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 7
Description: CTD casts + 02, transmissometer and fluorometer
ZoobenthosQuantity: number of stations = 9
Description: Seabed trawling - ecology and biochemistry
Geology and geophysics 
Core - soft bottomQuantity: number of stations = 6
Description: Various corer - various biological, biochemical, chemical, geochemical and geological parameters
Bottom photographyQuantity: number of stations = 14
Description: Seabed photography (video + stills)
Single-beam echosoundingDescription: 10 kHz echo-sounding, largely continuous
Multi-beam echosoundingDescription: 12 kHz swath bathymetry, limited extent on Indus Margin
Single channel seismic reflectionDescription: 3.5 kHz seabed profiling, limited extent on Indus Margin
Moorings, landers, buoys 
Geology and geophysics 
Bottom photography23° 30' 0" N  59° 30' 0" E — "Bathysnap" seabed time-lapse photography, recovery, 19 December 2002 to 12 March 2003, depth: 3008m
Data held at BODC 
Discrete samples 
11  CTD frame plus rosette samplerTransmittance and attenuance of the water column
Salinity of the water column
Dissolved oxygen parameters in the water column
Temperature of the water column
Concentration of suspended particulate material in the water column
Density of the water column
Chlorophyll pigment concentrations in water bodies
34  Sample taken from ship's non-toxic supplySalinity of the water column