Modelling of Advective Transport and Biogeochemistry at a Shallow Hydrothermal Vent System

Date

2017-08-18

Author

Bartlett, Stuart
Giovannelli, Donato
Yücel, Mustafa

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Inthisworkwepresentthefirstinaseriesofmodelresultsaimedatelucidatingthecomplexcouplingsbetweenfluidflow,heattransport,advectivetransportofsolutes,andmicrobialmatgrowthatashallowhydrothermalvent.WeareprimarilyinterestedintheventsystemsofMilos,Greece,wherebiofilmcommunitiesarespatiallysegregatedintodistinctdomains,eachwithaverydifferentspeciescomposition[1].Thelocationsofthesedomainsvarystronglywiththesandbedtopography.Inparticular,therearesharpspeciescompositiondifferencesbetweenthewindwardsideand the leeward side of the seafloor ripples. Thedeliveryofnutrientsandremovalofwasteproductsisclearlyafundamentalconstraintonthelocationofthevariousnichesforthesemicroorganisms.Thistransportofdissolvedchemicalspeciesiscontrolledbythephysicalpropertiesoftheseawaterandtheflowoffluidovertheripplesattheseafloor.Sincethisisahydrothermalregion,thefluidflowneartheseafloorcanbestronglyinfluencedbyrisingwarmfluidpercolatingthroughthesandfrombelow(combinedwiththetidalandwind-drivenmeanflowsabove).Thishydrothermalfluidcarriesitsownuniquesetofdissolved chemical species.Totrytouncovertherelationshipsbetweenthegrowthofthevariousmicroorganismsandthephysicochemicaldynamicsofthesesystems,weembarkedonanumericalmodellingeffort,makinguseoftheLatticeBoltzmannMethodtosimulatefluidflowandtheadvectionanddiffusionofheatandpassivescalars.Inthiswork,wepresenttheinitialresultsofoursimulations,showinghowdifferentfluiddynamicalboundaryconditionscontrolthesteadystatedistributionofchemicalspeciesandtemperatures throughout the vent system.

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https://hdl.handle.net/11511/72060
https://goldschmidtabstracts.info/2017/249.pdf

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Graduate School of Marine Sciences, Conference / Seminar