PECH8

Type Oceanographic cruise
Set This cruise is part of the set PECH
Ship Côtes De La Manche
Ship owner CNRS until 2019 - IFREMER since 2020
Dates 13/08/2010 - 19/08/2010
Chief scientist(s) HOWA Hélène

LABORATOIRE DES BIO-INDICATEURS ACTUELS ET FOSSILES - UMR CNRS 6112 LPG-BIAF

Université d'Angers

2, Bd Lavoisier

49000 ANGERS

02 41 73 53 91

https://lpg-umr6112.fr/?lang=fr
DOI 10.17600/10480140
Objective The main objective of the project is to improve understanding of the impact of calcareous production due to phytoplankton and zooplankton and its sedimentation on the carbon cycle in the south of the Bay of Biscay. In order to understand the population dynamics and mesoscale marine plankton fluxes on a time scale ranging from seasonal to inter-annual, good knowledge about plankton ecology and the geochemistry of the environment is essential. Consequently, this project includes analyses of (1) hydrography, (2) physical-chemical parameters in the water column, in bottom water and in interstitial water in the top centimetres of sediments (3) assemblages of living phytoplankton and zooplankton as they fall and are deposited on the bottom, and (4) stable isotopes of carbon and oxygen in the ambient seawater and in shells. (5) satellite imaging (groups of plankton and chlorophyll concentrations), to put our data into a regional context. (6) rate of particle flux in the water column and on the seabed (effectiveness of sediment traps, rate of sedimentation), calculated based on the 210Pb budget. Combining all this data will enable, for the first time, an integrated approach and general understanding of the ecology and biogeochemical significance of calcareous plankton in the Bay of Biscay and more generally in marginal seas. This cruise followed on from the PECH1 (June 2006), PECH3 (April 2007), PECH4 (November 2007), PECH5 (March 2008), PECH6 (July 2008) and FORCLIM 7 (April 2009) cruises. The cruise is part of the ANR FORCLIM (2006-2009) programmes, CYBER CAPLAN project (currently being assessed).

Bibliography

Publications

Kuhnt Tanja, Howa Helene, Schmidt Sabine, Marie Louis, Schiebel Ralf (2013). Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin). Journal Of Marine Systems, 109, S169-S181. Publisher's official version : https://doi.org/10.1016/j.jmarsys.2011.11.026 , Open Access version : https://archimer.ifremer.fr/doc/00125/23593/


Wit J. C., de Nooijer L. J., Barras C., Jorissen F. J., Reichart G. J. (2012). A reappraisal of the vital effect in cultured benthic foraminifer Bulimina marginata on Mg/Ca values: assessing temperature uncertainty relationships. Biogeosciences, 9(9), 3693-3704. Publisher's official version : https://doi.org/10.5194/bg-9-3693-2012 , Open Access version : https://archimer.ifremer.fr/doc/00249/36045/


Geslin E., Risgaard-Petersen N., Lombard F., Metzger E., Langlet DewiORCID, Jorissen F. (2011). Oxygen respiration rates of benthic foraminifera as measured with oxygen microsensors. Journal Of Experimental Marine Biology And Ecology, 396(2), 108-114. https://doi.org/10.1016/j.jembe.2010.10.011


Barras C., Duplessy J. -C., Geslin E., Michel Elisabeth, Jorissen F. J. (2010). Calibration of delta O-18 of cultured benthic foraminiferal calcite as a function of temperature. Biogeosciences, 7(4), 1349-1356. Publisher's official version : https://doi.org/10.5194/bg-7-1349-2010 , Open Access version : https://archimer.ifremer.fr/doc/00241/35177/


References of Articles published in other Periodicals or Scientific Works acclaimed in the Field

Barras Christine, Fontanier Christophe, Jorissen Frans, Hohenegger Johann (2010). A comparison of spatial and temporal variability of living benthic foraminiferal faunas at 550m depth in the Bay of Biscay. Micropaleontology, 56(3-4), 275-295.