Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Veldhuis, Marcel J W; Fransz, H George; de Bruin, Taco F (1996): Oceanography during TYDEMAN cruise DCM (DeepChlorMax) to the Equatorial Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.761718

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
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 nannoflagellates and ciliates, which feed on the small algae and on bacteria. Heterotrophic bacteria can outnumber the autotrophic algae, because their number is related to the substrate pools of dissolved and particulate dead organic matter. These DOC and detritus pools reach equilibrium at a concentration, where the rate of their production (proportional to algal biomass) equals their mineralisation and sinking rate (proportional to the concentration and weight of POC and detritus). At a relatively low value of the weight-specific loss rates, the equilibrium concentration of these carbon pools and their load of bacteria can be high. The bacterial productivity is proportional to the mineralisation rate, which in a steady state can never be higher than the rate of primary production. Hence the ratio in turnover rate of bacteria and autotrophs tends to be reciprocally proportional to their biomass ratio.
Related to:
Veldhuis, Marcel J W; Fransz, H George; de Bruin, Taco F (1996): Deep Chlorophyll Maximum 1996 - cruise report - Hr. Ms. Tydeman, 22 July to 31 August 1996 - The Deep Chlorophyll Maximum of the oceans: persistence of the plankton community, its biodiversity and its implications for carbon cycling. Royal Netherlands Institute for Sea Research, Texel, The Netherlands, NIOZ-RAPPORT, 22 pp, hdl:10013/epic.37632.d001
Project(s):
Coverage:
Median Latitude: 22.184826 * Median Longitude: -37.264815 * South-bound Latitude: 7.414800 * West-bound Longitude: -68.946700 * North-bound Latitude: 34.000800 * East-bound Longitude: -15.753300
Date/Time Start: 1996-07-20T12:52:00 * Date/Time End: 1996-08-31T20:43:00
Event(s):
DCM100-0 * Latitude: 11.025000 * Longitude: -49.760000 * Date/Time: 1996-07-29T03:18:00 * Campaign: DCM (DeepChlorMax) * Basis: Tydeman * Device: Absorption and beam attenuation (AC-9)
DCM100-1 * Latitude: 11.021667 * Longitude: -49.763333 * Date/Time: 1996-07-29T03:59:00 * Campaign: DCM (DeepChlorMax) * Basis: Tydeman * Device: CTD/Rosette (CTD-RO)
DCM100-10 * Latitude: 10.975000 * Longitude: -49.811667 * Date/Time: 1996-07-29T10:01:00 * Campaign: DCM (DeepChlorMax) * Basis: Tydeman * Device: Absorption and beam attenuation (AC-9)
Size:
19 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )

Datasets listed in this publication series

  1. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Chlorophyll and phaeopigments during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93831
  2. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Downwelling irradiance during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93746
  3. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Egg production of incubated copepods during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93959
  4. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Flying fish observations during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.91245
  5. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Hydrochemistry measured on water bottle samples during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.761691
  6. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Integrated daily PAR during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.91251
  7. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Marine optical absorption and attenuation during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.761694
  8. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Mesozooplankton biomass during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93931
  9. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Organic carbon and nitrogen in marine sediment from short time moorings during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93969
  10. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Particulate organic carbon and nitrogen during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93848
  11. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Photosynthetically available radiation (PAR) measured during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.91250
  12. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Physical oceanography during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.761693
  13. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Phytoplankton pigment analysis during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93815
  14. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Phytoplankton primary production during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93936
  15. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Primary production from in situ measurements during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93954
  16. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Primary production from simulated in situ measurements during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93964
  17. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Thermosalinograph data along the track of TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.91431
  18. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Transparency measurements with Secchi disc during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.91309
  19. Veldhuis, MJW; Fransz, HG; de Bruin, TF (1996): Upwelling irradiance during TYDEMAN cruise DCM. https://doi.org/10.1594/PANGAEA.93759