[email protected] esonet demonstration mission: long ... loome_session3.pdfhydrosphere 650 m 760 m...
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All All Regions Regions Workshop #1, Workshop #1, Barcelona Barcelona 5-7th Sept. 20075-7th Sept. 2007
Dirk de Dirk de Beer and Beer and LOOME LOOME partnerspartners
Max Planck Max Planck Institute Institute for Marinefor MarineMicrobiology Microbiology (KDM)(KDM)
dbeer@[email protected]
ESONET ESONET demonstration missiondemonstration mission::Long-term Observatory Long-term Observatory OnOn
Mud-volcano EruptionsMud-volcano Eruptions
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ESONET demonstration mission:Long-term Observatory On
Mud-volcano Eruptions(LOOME)
MPI-MM
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Mud volcanism:- the window of the deep subsurface to the ocean
- rapid (catastrophic) transport of energy and mass
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Observatory Target site:Håkon Mosby Mud Volcano
-Norwegian margin, 1250 m depth
-methane emitting geostructure
-hydrate reservoir
-chemosynthetic ecosystem
-polar bottom water
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HMMV is a target site ofHERMES, MARBEF and ESONET,and this is the first proposal for aninterdisciplinary observatory there.
LOOME partners:
• Ifremer• University of Pierre and Marie Curie• University in Tromsø• Norges Geotekniske Institutt• KDM
– Marum– AWI– IfM-Geomar– Max-Planck-Institute for Marine Microbiology
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A mud volcano is created whenoverpressurized gases expandand erupt.
What is interesting about observation of mud volcanism?
Reservoir at 2 km depth, > 45°C
Gas hydratesConsequently subsurfacefluids, gases and muds aredisplaced and emitted to theseafloor, forminghydrate systems andchemosynthetic habitats
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Warm, methane-rich fluids rise
HydrateStability Zone (T<14C)
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Hydrate formation at outer ring,lifting the seafloor
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Pogonophora(ventilating worms)
Beggiatoa(filamentous sulfur oxidisers)
Grey mud
Seafloor topography and habitat structure at HMMV
Data by IFREMER microbathymetry team
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• Mass transfer!
Pogonophora Beggiatoa Center
Lesson from in situ measurements:Upward flow of warm subsurface fluids create a
circular habitat structure at HMMV (and other MVs)!
DeBeer et al. 2006,L&O;Niemann et al. 2006,Nature
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O2 NO3- SO4
-2
e-acceptor free
no O2 NO3- SO4
-2
Effects water upflow on sediment lifeDiffusion
Advection
Upflow
Center: 3-6 m/yr
Beggiatoa: 0.3-1 m/yr
Pogonophora: 0 m/yr
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Methane emission to thehydrosphere
6 5 0 m
7 6 0 m
ARK XIX/3 b , 2 0 0 3
5 4 0 m 770
m
ARK XVIII/1 b , 2 0 0 2 :
Sauter et al. (2006) Earth Plan. Sci. Lett.Niemann et al. (2006) Nature
13–40 106 mol CH4 yr–1
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Previous results from annual visits to HMMV:understanding spatial scales of change
Foucher et al. 2003 Foucher et al 2006
Most active areaT-lance just adjacent (2005-2006)
Data by IFREMER microbathymetry team
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Long-term T-dynamics
Data from Feseker, Foucher and Schlüter (Ifremer/AWI)
9 month deployment of Gravity core with 8 T-sensors
Dramatic T-changesProbably eruptions
Questions: What happens? Gas escape? Mechanism? Early signals?Consequences for geochemistry, microbiology and fauna?
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Scientific Aims ofLOOME observatory
1) Document phenomena of eruptions
2) Study their effects on the ecosystem
3) Quantify variability in fluid flow, gas emission andhabitat cover
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• Deployment for 1- 1.5 year
• Integration of sensors: Seismometers (deep mud and fluid motion) Subsurface temperature and pore pressure lance Surface Temperature and Chemistry (pH, redox, H2S, O2) Imaging gasflares by sonar, ADCP, camera Water column: methane sensor, CTD
• Monitor changes of the seafloor topography, benthic life, larvalcolonization and sediment geochemistry by ROV
To sensors/camera
float
Rack with loggers
Cables connection
sensors to loggers
spools
Heavy plate
5 m
To sensors/camera
float
Rack with loggers
Cables connection
sensors to loggers
spools
Heavy plate
5 m
Long-term Observatory OnMud-volcano Eruptions (LOOME)
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Phase I: Mooring of subsurfacepressure / temperature probe
Data by IFREMER microbathymetry team
PT probe
Hot Spot
RV Jan Mayen Cruise 2008;coordinator J Mienert UiT
UiT/IFREMER deployment ofPT lance (logger retrieval 2009)
20 m
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Data by IFREMER microbathymetry team
Central frame of observatoryat safe place
Hot Spot
RV POLARSTERN/ROVQUEST Cruise 2009;coordinator A Boetius, MPI/AWI
Phase II: Mooring of subsurfacepressure / temperature probe
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All systems register with lowfrequency, to save battery and memory
low pH, low OPRanoxic, warm
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Seismometer registers activity
-> wake up sonar, ADCP, camerato measure in high frequency
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Frame with electronicsis placed outside hot spotat save place
Only cabled sensors are exposed.
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camera
ADCP
Scanning sonar
Methane sensor
seismometer
Wake up call
Surface DO, pH, OPR
Surface T
Data storage
Data storage
Data flow
All units have own power and memory, data storage units can be released
Surface flow sensor
Colonizer &sensors
PT lance
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Technological Aims ofLOOME observatory
• Integrate as many sensors as possible: definebest parameters for further long term observationof mud volcanism
• Develop and optimize integrated ways ofunderwater data storage and retrieval
• Develop a principle and technology for wake upcalls to energy-expensive instruments
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Integration with otherscientific projects
• Share cruise platforms and data:geophysical, hydrological, geological,geochemical, biological studies
• Cooperation with HERMES I+II• Cooperation with ESF EuroDiversity
CHEMECO• Cooperation with CoML CHESS and ICOMM
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LOOME data integration and management
•The underwater communication will be by optical fiber
•Data from all units mirrored on separate storage device
•Storage device can be released and retrieved from anyship
•Loome is interdisciplinary, producing large amounts ofdata in various formats (video, photo, tracks, digitaldata, maps, biological data etc)
• use the database chosen by HERMES (PANGAEA),most data pipelines are established
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Thank you for your attention!
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Team• Ifremer- Jean Paul Foucher, Nadine LeBris, Katrien Olu (pore pressure,
microbathymetry, camera, colonization experiment)• UPMC- Francoise Gaill, Sebastian Duperron, Olivier Gros, Sylvie Gaudron
(colonization experiment, chemosynthesis)• UiT- Jürgen Mienert, Stefan Bünz, Alfred Hansen (seismometer)• NGI- James Strout, Anne Gunn Rike (microbial analyses)• KDM- Christoff Waldmann, Volker Ratmeyer, Gerard Bohrmann (sonar,
ADCP, ROV, datastorage & communication), Tom Feseker (T-string),Eberhard Sauter, Thomas Soltwedel, Christiane Hasemann, Michael Klages,Michael Schlüter (methane sensor, ship, meiofauna analyses) , Antje Boetius,Frank Wenzhöfer, Dirk de Beer (chemical sensor string, frame, elevator)
• TMBL/U Goteborg, shallow water testing, Tomas Lundalv