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BENCAL Cruise ReportThis report documents the scientific activities on board the South African Fisheries Research Ship (FRS) Africana during an ocean color calibration and validation cruise in the Benguela upwelling ecosystem (BEN-CAL), 4-17 October 2002. The cruise, denoted Afncana voyage 170, was staged in the southern Benguela between Cape Town and the Orange River within the region 14-18.5 deg E,29-34 deg S, with 15 scientists participat- ing from seven different international organizations. Uniquely in October 2002, four high-precision ocean color sensors were operational, and these included the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on the Aqua and Terra spacecraft, the Medium Resolution Imaging Spectrometer (MERIS), and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). SeaWiFS imagery was transmitted daily to the ship to assist in choosing the vessel's course and selecting stations for bio-optical deployments. There were four primary objectives of the cruise. The first was to conduct bio-optical measurements with above- and in-water optical instruments to vicariously calibrate the satellite sensors. The second was to interrelate diverse measurements of the apparent optical properties (AOPs) at satellite sensor wavelengths with inherent optical properties (IOPs) and bio-optically active constituents of seawater such as particles, pigments, and dissolved compounds. The third was to determine the interrelationships between optical properties, phytoplankton pigment composition, photosynthetic rates, and primary production, while the fourth objective was to collect samples for a second pigment round-robin intercalibration experiment. Weather conditions were generally very favorable, and a range of hyperspectral and fixed wavelength AOP instruments were deployed during daylight hours. Various IOP instruments were used to determine the absorption, attenuation, scattering, and backscattering properties of particulate matter and dissolved substances, while a Fast Repetition Rate Fluorometer (FRRF) was deployed to acquire data on phytoplankton photosynthetic activity. Hydrographic profiling was conducted routinely during the cruise, and seawater samples were collected for measurements of salinity, oxygen, inorganic nutrients, pigments, particulate organic carbon, suspended particulate material, and primary production. Location of stations and times of optical deployments were selected to coincide with satellite overpasses whenever possible, and to cover a large range in trophic conditions.
Document ID
20030112414
Acquisition Source
Goddard Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Hooker, Stanford B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Firestone, Elaine R. (Science Applications International Corp. Beltsville, MD, United States)
Barlow, Ray (Marine and Coastal Management Cape Town, South Africa)
Sessions, Heather (Marine and Coastal Management Cape Town, South Africa)
Silulwane, Nonkqubela (Marine and Coastal Management Cape Town, South Africa)
Engel, Hermann (Marine and Coastal Management Cape Town, South Africa)
Aiken, James (Plymouth Marine Lab. United Kingdom)
Fishwick, James (Plymouth Marine Lab. United Kingdom)
Martinez-Vicente, Victor (Plymouth Marine Lab. United Kingdom)
Morel, Andre (Centre de Recherches Oceanographiques Villefranche-sur-Mer, France)
Date Acquired
September 7, 2013
Publication Date
September 1, 2003
Publication Information
ISSN: 1522-8789
Subject Category
Oceanography
Report/Patent Number
NAS 1.15:206892/VOL27
Rept-2003-01909-0/VOL27
NASA/TM-2003-206892/VOL27
Distribution Limits
Public
Copyright
Public Use Permitted.

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