Oceanography during TYDEMAN cruise DCM (DeepChlorMax) to the Equatorial Atlantic ...

The cruise with RV Tydeman was devoted to study permanently stratified plankton systems in the (sub)tropical ocean, which are characterised by a deep chlorophyll peak between 80 and 150 m. To minimise lateral effects by horizontal transport of nutrients and organic matter from river outflow and upwe...

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Bibliographic Details
Main Authors: Veldhuis, Marcel J W, Fransz, H George, de Bruin, Taco F
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 1996
Subjects:
Underway cruise track measurements
Absorption and beam attenuation
CTD/Rosette
Advanced spectral irradiance meter
Multiple opening/closing net
Vertical net
Secchi disk
Spectral radiometer
Trap
DCM
Tydeman
Joint Global Ocean Flux Study JGOFS
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.761718
https://doi.pangaea.de/10.1594/PANGAEA.761718
Description
Summary:The cruise with RV Tydeman was devoted to study permanently stratified plankton systems in the (sub)tropical ocean, which are characterised by a deep chlorophyll peak between 80 and 150 m. To minimise lateral effects by horizontal transport of nutrients and organic matter from river outflow and upwelling regions, stations were selected in the middle of the North Atlantic Ocean between the continents of America and Africa. (5 - 35° N and 50 - 15° W). Here the vertical distributions of light and nutrients control the abundance and growth of autotrophic algae in the thermically stratified water column. This phytoplankton is numerically dominated by the prokaryotic picoplankters Synechococcus spp. and Prochlorococcus spp., which are smaller than 2 ?m. The productivity of the 100 to 150 m deep euphotic zone can be high, because a high heterotrophic/autotrophic biomass ratio induces a rapid regeneration of nutrients and inorganic carbon. Primary grazers are mainly micro-organisms such as heterotrophic ...

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