DIAPALIS 6

Name: DIAPALIS 6
Start: 2002-08-05
End: 2002-08-12
Location: Coral Sea

Type	Oceanographic cruise
Set	This cruise is part of the set DIAPALIS
Ship	Alis
Ship owner	IRD
Dates	05/08/2002 - 12/08/2002
Chief scientist(s)	LE BOUTEILLER Aubert
	INSTITUT MÉDITERRANÉEN D'OCÉANOLOGIE - UMR 7294 UMR IRD 235 - MARSEILLE 163 avenue de Luminy Bâtiment Méditerranée 13288 Marseille Cedex 9 +33(0)4 86 09 05 00 https://www.mio.osupytheas.fr/fr/linstitut-mediterraneen-doceanologie/presentation-2/
DOI	10.17600/2100140
Objective	Answering the following questions: What environmental conditions are needed for optimal growth of Trichodesmium and other diazotrophic cyanobacteria? This particularly involved determining the respective roles played by iron and phosphorus in Trichodesmium growth and where they came from. What role does Trichodesmium play and what are the biogeochemical consequences in the environment of the development of these organisms? Which phytoplankton communities develop, which food webs are built, which nitrogen, carbon and phosphorus fluxes are established before, during and after a Trichodesmium bloom? Three points were set: 1) Offshore in the Loyalty channel (21 deg 30'S; 167 deg 26'E) at a depth of 2,100m (2 days). 2) Bay of Santal (167 deg 04'E; 20 deg 51'S) at Lifou (2 days). 4) Lagoon (21 deg 57'S; 166 deg 45'E) at Ouinne (2 days). Lastly, a station was visited in the lagoon (21 deg 54.70'S; 166 deg 04'E) at a depth of 40 m. The related programmes are IRD: DIAPAZON programme coordinated by UR Cyano and the Lodyc, 2) INSU: national PROOF programme. Comments on the cruise's progression: Excellent working conditions on board. The new turning contact winch was implemented without any great difficulty.

Sea/Ocean

Coral Sea

Ports

Port of departure : Noumea (New Caledonia)

Port of return : Noumea (New Caledonia)

Project

JGOFS - FRANCE/PROOF

Scientific Authority

COM / LAB. D'OCEANOG. PHYS. & BIOGEOCHIMIQ. (LOPB) - LUMINY

UMR 6535

Campus de Luminy

13288 MARSEILLE CEDEX 9

+33(0)4 91 82 91 15

queguiner@com.univ-mrs.fr

Participating bodie(s)

IRD pour la partie travail de terrain ; IRD, CNRS, IUEM et Université pour les analyses et l'exploitation des donnees.

Discipline(s)

PHYSICAL OCEANOGRAPHY
BIOLOGICAL OCEANOGRAPHY
CHEMICAL OCEANOGRAPHY
ENVIRONMENT

Code	Label	Quantity	PI
B01	Primary productivity C14, 13C, N15 methods - 6 profiles of 6h, 12h, 24h with size fraction	6 stations	LE BOUTEILLER Aubert
B02	Phytoplankton pigments (eg chloroph 6 chlorophyll pigment profiles with size fractionation, 4 phycoerythrin pigment profiles	8 stations	NEVEUX Jacques
B03	Seston Surface sampling for dry weight measurement by double weighing of filters	4 samples	DUPOUY Cécile
B06	Dissolved organic matter (inc DOC) With P. Raimbault - POD (4 stations), NOD and COD (5 stations)	-	MOUTIN Thierry
B07	Pelagic bacteria/micro-organisms Profiles of heterotrophic bacteria counts by flow cytometer	6 profiles	BLANCHOT Jean
B08	Phytoplankton 8 vertical and horizontal net lines for filament and bundle counting	-	NEVEUX Jacques
B71	Particulate organic matter (inc POC Particulate organic phosphate, COP and NOP	6 profiles	MOUTIN Thierry
B72	Biochemical meas. (eg,lipids,amino Phosphate uptake kinetics with size fractionation	8 stations	MOUTIN Thierry
B73	Sediment traps 24h deployment (100 and 250m) in Chenal loyauté and Baie de Santal	-	RODIER Martine
D71	Current profiler (eg ADCP) Continuous measurements (except in the lagoon) using the ADCP on board	-	PANCHE Jean-Yves
H09	Water bottle stations Go-Flo 5 litre bottles, Noex 5 litre bottles	8 stations	LE BOUTEILLER Aubert
H10	CTD stations PRES, TEMP, Salinity - Fluorescence, Transmissiometry (uncontrolled)	26 stations	PANCHE Jean-Yves
H16	Transparency (eg transmissometer) Transmissometry on STD probe and Quantametry	-	PANCHE Jean-Yves
H17	Optics (eg underwater light levels) 5 sights with Simbada from LOA Lille, 8 particle absorption profiles	26 samples	DUPOUY Cécile
H22	Phosphate Dissolved phosphate profiles (on board), 6 MAGIC phosphorus profiles (deferred)	6 stations	RODIER Martine
H23	Total - P Particulate phosphate profiles + size fractionations	6 stations	MOUTIN Thierry
H24	Nitrate Nitrate profiles (analyses at the Noumea Centre's joint lab)	6 stations	RODIER Martine
H25	Nitrite Nitrite profiles (analyses at the common lab of the Noumea Centre)	6 stations	RODIER Martine
H30	Trace elements Total and dissolved iron profiles (0 to 80 m) with pump sampling	4 stations	RODIER Martine
H32	Isotopes Analysis of delta-N15 + 4 samples collected in sediment traps	-	LE BOUTEILLER Aubert
H71	Surface measurements underway (T,S) On-board thermosalinometer used continuously	-	LE BOUTEILLER Aubert
H76	Ammonia 66 measurements - On-board fluorometer analysis	6 stations	RODIER Martine
M02	Incident radiation Continuous measurement of incident PAR radiation with integration	-	LE BOUTEILLER Aubert

Summary of measurements

-Physical oceanography: temperature, salinity, ADCP current measurements.
-Chemistry: NO3, NO2, NH4, PO4, O2, DIC, alkalinity, POC, DOC, PON, DON, POP, DOP.
-Pigments (chlorophylls and phycoerythrines) of phytoplankton measured using the spectrofluorimeter.
-Picophyotoplankton and baterial cell counts using flow cytometer.
-Delta-N15, delta-C13 and O18. Total iron and dissolved iron.
-Sedimentation measurements using particle traps.
-Primary production, nitrogenous production and diazotrophy in the water column.
- Phosphate assimilation and phosphorus cycle. Bacterial production.
- Samples taken in 35 µm net.
-Measurements using the Simbada, of absorption and dissolved fraction.

Location map

Joint document(s)

Data managed by SISMER

Bibliography

Publications

Dupouy Cécile, Whiteside Andra, Tan Jing, Wattelez Guillaume, Murakami Hiroshi, Andréoli Rémi, Lefèvre Jérôme, Röttgers Rüdiger, Singh Awnesh, Frouin Robert (2023). A Review of Ocean Color Algorithms to Detect Trichodesmium Oceanic Blooms and Quantify Chlorophyll Concentration in Shallow Coral Lagoons of South Pacific Archipelagos. Remote Sensing, 15(21), 5194 (25p.). Publisher's official version : https://doi.org/10.3390/rs15215194 , Open Access version : https://archimer.ifremer.fr/doc/00871/98267/

Dutheil Cyril, Aumont Olivier, Gorgues Thomas, Lorrain Anne, Bonnet Sophie, Rodier Martine, Dupouy Cecile, Shiozaki Takuhei, Menkes Christophe (2018). Modelling N2 fixation related to Trichodesmium sp.: driving processes and impacts on primary production in the tropical Pacific Ocean. Biogeosciences, 15(14), 4333-4352. Publisher's official version : https://doi.org/10.5194/bg-15-4333-2018 , Open Access version : https://archimer.ifremer.fr/doc/00419/53042/

Moutin Thierry, Wagener Thibaut, Caffin Mathieu, Fumenia Alain, Gimenez Audrey, Baklouti Melika, Bouruet-Aubertot Pascale, Pujo-Pay Mireille, Leblanc Karine, Lefevre Dominique, Nunige Sandra Helias, Leblond Nathalie, Grosso Olivier, de Verneil Alain (2018). Nutrient availability and the ultimate control of the biological carbon pump in the Western Tropical South Pacific Ocean. Biogeosciences, 15(9), 2961-2989. Publisher's official version : https://doi.org/10.5194/bg-15-2961-2018 , Open Access version : https://archimer.ifremer.fr/doc/00420/53113/

Barboza Tenorio Marcio Murilo, Dupouy Cecile, Rodier Martine, Neveux Jacques (2018). Trichodesmium and other planktonic cyanobacteria in New Caledonian waters (SW tropical Pacific) during an El Niño episode. Aquatic Microbial Ecology, 81(3), 219-241. Publisher's official version : https://doi.org/10.3354/ame01873 , Open Access version : https://archimer.ifremer.fr/doc/00439/55078/

Fuchs Rosalie, Pinazo Christel, Douillet R., Fraysse Marion, Grenz Christian, Mangin A., Dupouy C. (2013). Modelling ocean-lagoon interaction during upwelling processes in the South West of New Caledonia. Estuarine Coastal And Shelf Science, 135, 5-17. https://doi.org/10.1016/j.ecss.2013.03.009

Fuchs R., Dupouy C., Douillet Pascal, Caillaud Matthieu, Mangin A., Pinazo Christel (2012). Modelling the impact of a La Nina event on a South West Pacific Lagoon. Marine Pollution Bulletin, 64(8), 1596-1613. https://doi.org/10.1016/j.marpolbul.2012.05.016

Dupouy Cecile, Neveux Jacques, Ouillon Sylvain, Frouin Robert, Murakami Hiroshi, Hochard Sebastien, Dirberg Guillaume (2010). Inherent optical properties and satellite retrieval of chlorophyll concentration in the lagoon and open ocean waters of New Caledonia. Marine Pollution Bulletin, 61(7-12), 503-518. https://doi.org/10.1016/j.marpolbul.2010.06.039