DIAPALIS 1

Name: DIAPALIS 1
Start: 2001-10-22
End: 2001-10-31
Location: Coral Sea

Type	Oceanographic cruise
Set	This cruise is part of the set DIAPALIS
Ship	Alis
Ship owner	IRD
Dates	22/10/2001 - 31/10/2001
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	10.17600/1100100
Objective	What environmental conditions are necessary for optimal growth of Trichodesmium and other diazotrophic cyanobacteria? In particular, the goal was to determine the origin of iron and phosphorus and their respective roles in the growth of Trichodesmium. What are the biogeochemical consequences of the development of these organisms on the environment? Which phytoplankton communities develop, what kinds of food webs are built, what kinds of nitrogen, carbon and phosphorus fluxes are established before, during and after Trichodesmium blooms? This first cruise was rather exploratory in nature. The main goal was to determine if the strategy adopted was the right one, if the set points had been well chosen and if the sampling tools were appropriate. The related programs are IRD: UR CYANO: DIAPAZON program, INSU: national PROOF program.

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 et Université pour l'exploitation ds donnees.

Discipline(s)

PHYSICAL OCEANOGRAPHY
BIOLOGICAL OCEANOGRAPHY
CHEMICAL OCEANOGRAPHY
ENVIRONMENT

Code	Label	Quantity	PI
B01	Primary productivity C14 and P33 methods - full profiles	7 stations	LE BOUTEILLER Aubert
B02	Phytoplankton pigments (eg chloroph Pigment profiles with fluorometer and spectrofluorometer	19 stations	LE BOUTEILLER Aubert
B03	Seston Profiles with 20 µm sieving and counting	7 profiles	LE BOUTEILLER Aubert
B06	Dissolved organic matter (inc DOC) Sampling and filtration on 0.2 µm filter for MOD measurement	11 samples	LE BOUTEILLER Aubert
B07	Pelagic bacteria/micro-organisms Profiles for counting bacteria and picophytopla with flow cytometer	4 profiles	LE BOUTEILLER Aubert
B08	Phytoplankton 35 µm net lines for Trichodesmium counting	22 hauls	LE BOUTEILLER Aubert
B09	Zooplankton 20 µm net lines for zooplankton counting	8 hauls	LE BOUTEILLER Aubert
B71	Particulate organic matter (inc POC Particulate organic phosphorus measurement profiles	11 profiles	LE BOUTEILLER Aubert
D71	Current profiler (eg ADCP) Continuous measurements using on-board ADCP	-	LE BOUTEILLER Aubert
G74	Multi-beam echosounding Description of some of the areas covered in the East Lagoon in front of Ouinne	-	LE BOUTEILLER Aubert
H09	Water bottle stations Niskin rosette (12 bottles of 8l)	14 stations	LE BOUTEILLER Aubert
H10	CTD stations 0-200 m - Pressure, Temperature, Salinity	26 stations	LE BOUTEILLER Aubert
H16	Transparency (eg transmissometer) A PNF profile equipped with a PAR sensor	-	LE BOUTEILLER Aubert
H17	Optics (eg underwater light levels) 25 Hydroscat-6, 17 targets with Simbada 03	25 profiles	LE BOUTEILLER Aubert
H21	Oxygen Sensor on the CTD probe	26 stations	LE BOUTEILLER Aubert
H22	Phosphate Dissolved phosphate profiles (on board), 3 MAGIC phosphorus profiles (deferred)	14 stations	LE BOUTEILLER Aubert
H23	Total - P POP	3 profiles	LE BOUTEILLER Aubert
H24	Nitrate	11 profiles	LE BOUTEILLER Aubert
H25	Nitrite	11 profiles	LE BOUTEILLER Aubert
H30	Trace elements Total and dissolved iron profiles	10 profiles	LE BOUTEILLER Aubert
H32	Isotopes Samples collected for delta-N15 analysis	4 stations	LE BOUTEILLER Aubert
H76	Ammonia NH4 profiles	6 profiles	LE BOUTEILLER Aubert
M02	Incident radiation Continuous measurement of incident PAR radiation	-	LE BOUTEILLER Aubert

Summary of measurements

-Physical oceanography: temperature, salinity, ADCP current measurements.
-Chemistry: NO3, NO2, NH4, PO4. Total iron and dissolved iron in the euphotic layer.
-Phytoplankton pigments using a fluorimeter and a spectrofluorimeter.
-Cell counts of picophytoplankton using a flow cytometer.
-Samples taken for molecular biology analyses.
-Samples taken for delta-N15 analyses using a mass spectrometer.
-Primary production in the water column (7 days of measurements).
-Phosphate assimilation and phosphorus cycle.
-Samples taken using a 35 micron and a 200 micron net.
-Measurements using the Simbada-3 and Hydroscat-6, 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

Thesis using campaign data

Receveur Aurore (2019). Ecologie spatiale du micronecton : distribution, diversité et importance dans la structuration de l'écosystème pélagique du Pacifique sud-ouest. PhD Thesis, Unversité d'Aix Marseille.