DIAPALIS 7

Name: DIAPALIS 7
Start: 2003-02-03
End: 2003-02-12
Location: Coral Sea

Type	Oceanographic cruise
Set	This cruise is part of the set DIAPALIS
Ship	Alis
Ship owner	IRD
Dates	03/02/2003 - 12/02/2003
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/mio/presentation
DOI	10.17600/3100020
Objective	Complementing observations made during previous cruises and succeed in stuyding Trichodesmium-rich waters to meet the following objectives: Determining the respective roles played by iron and phosphorus in primary production and and the diazotrophy of Trichodesmium and other diaotrophic cyanobacteria. Quantifying the diazotrophy in various situations and estimating its impact on the environment. Finally, take marine optical measurements to assess diazotrophic cyanobacteria abundance from water colour satellite images. Four set points were occupied: 1) North-east of Lifou (20 deg 37'S; 167 deg 26'E) during 2 days. 2) in the Bay of Santal (167 deg 04'E; 20 deg 51'S) at Lifou (3 days). 3) south of Ouvea (20 deg 57'S; 166 deg 29'E)during one day. 4) southwest of Noumea (22 deg 34'S; 166 deg 06'E) during 2 days. Lastly, a station was visited southeast of Yate (21 deg 56'S; 167 deg 04'E) at a depth of 1000 m. The cruise falls under the following IRD programs: DIAPAZON (UR Cyano and Lodyc), DME department and INSU : National PROOF program (JGOFS-France).

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

Discipline(s)

PHYSICAL OCEANOGRAPHY
BIOLOGICAL OCEANOGRAPHY
CHEMICAL OCEANOGRAPHY
ENVIRONMENT

Code	Label	Quantity	PI
B01	Primary productivity With N. Garcia - C14, 13C, N15 methods - 7 profiles of 12 h and/or 24h	7 stations	LE BOUTEILLER Aubert
B02	Phytoplankton pigments (eg chloroph 6 chlorophyll pigment profiles, 4 phycoerythrin pigment profiles	10 stations	NEVEUX Jacques
B03	Seston Samples for dry weight measurement by double weighing of filters	-	DUPOUY Cécile
B06	Dissolved organic matter (inc DOC) With P. Raimbault - POD (4 stations), NOD and COD (5 stations)	5 stations	MOUTIN Thierry
B07	Pelagic bacteria/micro-organisms With M. Rodier - 6 heterotrophic bacteria counts with flow cytometer	6 stations	BLANCHOT Jean
B08	Phytoplankton With C. Dupouy - Trichodesmium filament and bundle counts	-	NEVEUX Jacques
B71	Particulate organic matter (inc POC Particulate phosphate (total and >10 µm fraction), COP and NOP	-	MOUTIN Thierry
B72	Biochemical meas. (eg,lipids,amino Fixed point, phosphate uptake kinetics with size fraction	-	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 & Noex 5 litres, size fractionation & in situ experimentation.	12 stations	LE BOUTEILLER Aubert
H10	CTD stations Temperature, salinity, transmissometry, fluorescence	48 stations	PANCHE Jean-Yves
H16	Transparency (eg transmissometer) Transmissometry, Quantametry (comparison PAR Insitu/PAR incident)	-	PANCHE Jean-Yves
H17	Optics (eg underwater light levels) 5 targets (SIMBADA) - Absorption of particles, detritus, dissolved substances	-	DUPOUY Cécile
H22	Phosphate 8 dissolved phosphate profiles (on board), 6 phosphorus profiles MAGIC method (deferred)	9 stations	RODIER Martine
H23	Total - P 4 particulate phosphate profiles + size fractionations	5 stations	MOUTIN Thierry
H24	Nitrate 8 nitrate profiles (analysed in the joint lab at the Noumea Centre)	8 stations	RODIER Martine
H25	Nitrite 8 nitrite profiles	8 stations	RODIER Martine
H30	Trace elements 4 total & dissolved iron profiles (0 to 80 m) with pump sampling	-	RODIER Martine
H32	Isotopes 8 samples for delta-N15 analysis + 4 samples in sediment traps	-	LE BOUTEILLER Aubert
H71	Surface measurements underway (T,S) On-board thermosalinometer used continuously	-	LE BOUTEILLER Aubert
H75	Total - N	-	LE BOUTEILLER Aubert
H76	Ammonia 8 NH4 profiles (on board fluorometer analysis)	7 stations	RODIER Martine
M02	Incident radiation Continuous measurement of incident PAR radiation with integration over the day	-	LE BOUTEILLER Aubert

Summary of measurements

-Physical oceanography : temperature, salinity and ADCP current meter
-Chemistry: NO3, NO2, NH4, PO4, O2, DIC, alkalinity, POC, DOC, PON, DON, POP, DOP.
-Pigments (chlorophylls and phycoerythrines) of phytoplankton using the spectrofluorimeter.
-Picophyotoplankton and bacterial cell counts using flow cytometer.
-Delta-N15, delta-C13 and delta-O18. Total iron and dissolved iron.
- Sedimentation 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. Diazotrophic cyanobacteria counts.
-Measurements using the Simbada and Hydroscat, measuring absorption and the 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/

Cravatte Sophie, Kestenare Elodie, Eldin Gerard, Ganachaud Alexandre, Lefevre Jerome, Marin Frederic, Menkes Christophe, Aucan Jerome (2015). Regional circulation around New Caledonia from two decades of observations. Journal Of Marine Systems, 148, 249-271. https://doi.org/10.1016/j.jmarsys.2015.03.004

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