CTD observations on the North Brazil shelf during a multidisciplinary Amazon Shelf Sediment Study, AMASSEDS, August 1989
Citable URI
https://hdl.handle.net/1912/6453Location
North Brazil shelfAmazon River
DOI
10.1575/1912/6453Keyword
Amazon Shelf Sediment Study; Hydrography; Marine sediments; Columbus Iselin (Ship) Cruise CI8909Abstract
CTD and acoustic Doppler current profiler (ADCP) observations were made on the
North Brazil shelf adjacent to the mouth of the Amazon River during R/V Iselin cruise
I8909 August 3-14, 1989 as part of A Multidisciplinary Amazon Shelf SEDiment Study
(AMASSEDS). These observations were obtained during a large-scale survey in support
of geological and geochemical sampling, an anchored time series station consisting of 26
hourly CTD casts, and one transect which was repeated off the mouth of the Amazon
River. The maximum sampling depth at each station was within two meters of the
bottom.
The primary objectives of the AMASSEDS hydrographic measurement program
were to (a) observe and characterize the temperature, salinity, density, oxygen, fluorescence
and light transmission fields and their spatial variability on the north Brazilian
shelf directly influenced by the Amazon River discharge, (b) resolve the seaward extent
and vertical structure of the surface plume of low salinity Amazon River water during
different stages of river discharge, (c) describe the spatial structure of the turbidity and
associated suspended sediment distributions across the shelf, (d) characterize the properties
of the Amazon shelf water beneath the surface plume and their seasonal variability,
and (e) describe the landward penetration of the North Brazil Current (NBC) with respect
to water properties and shelf currents. This report represents a summary in graphic
and tabular form of the hydrographic observations made during the first AMASSEDS
cruise (I8909) on the R/V Iselin.
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Suggested Citation
Limeburner, R., & Beardsley, R. C. (1989). CTD observations on the North Brazil shelf during a multidisciplinary Amazon Shelf Sediment Study, AMASSEDS, August 1989. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/6453Related items
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