Search Results - "Armand, Leanne K"

First records of winter sea ice concentration in the southwest Pacific sector of the Southern Ocean by Ferry, Alexander J., Crosta, Xavier, Quilty, Patrick G., Fink, David, Howard, William, Armand, Leanne K.

“…We use a Generalized Additive Model (GAM) to provide the first winter sea ice concentration record from two cores located within the southwest Pacific sector…”
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The fate of diatom valves in the Subantarctic and Polar Frontal Zones of the Southern Ocean: Sediment trap versus surface sediment assemblages by Rigual-Hernández, Andrés S., Trull, Thomas W., Bray, Stephen G., Armand, Leanne K.

“…An array of deep ocean sediment traps was initiated in 1997 within the Australian sector of the Southern Ocean, and serviced annually for over a decade (the…”
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Seasonal dynamics in diatom and particulate export fluxes to the deep sea in the Australian sector of the southern Antarctic Zone by Rigual-Hernández, Andrés S., Trull, Thomas W., Bray, Stephen G., Closset, Ivia, Armand, Leanne K.

“…Particle fluxes were recorded over a one-year period (2001-02) in the southern Antarctic Zone in the Australian Sector of the Southern Ocean. Here, we present…”
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Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W by Grigorov, Ivo, Rigual-Hernandez, Andrés S., Honjo, Susumu, Kemp, Alan E.S., Armand, Leanne K.

“…An array of four sediment trap moorings recorded the particulate flux across the Antarctic Circumpolar Current (ACC) at 170°W, between November 1996 and…”
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Temporal changes in size distributions of the Southern Ocean diatom Fragilariopsis kerguelensis through high-throughput microscopy of sediment trap samples by Kloster, Michael, Rigual-Hernández, Andrés S., Armand, Leanne K., Kauer, Gerhard, Trull, Thomas W., Beszteri, Bánk

“…Some aspects of the life cycle of the Southern Ocean diatom Fragilariopsis kerguelensis have been investigated previously, but many of its details have not…”
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Ancient DNA from marine sediments: Precautions and considerations for seafloor coring, sample handling and data generation by Armbrecht, Linda H., Coolen, Marco J.L., Lejzerowicz, Franck, George, Simon C., Negandhi, Karita, Suzuki, Yohey, Young, Jennifer, Foster, Nicole R., Armand, Leanne K., Cooper, Alan, Ostrowski, Martin, Focardi, Amaranta, Stat, Michael, Moreau, John W., Weyrich, Laura S.

“…The study of ancient DNA (aDNA) from sediments (sedaDNA) offers great potential for paleoclimate interpretation, and has recently been applied as a tool to…”
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Composition of diatom communities and their contribution to plankton biomass in the naturally iron-fertilized region of Kerguelen in the Southern Ocean by Lasbleiz, Marine, Leblanc, Karine, Armand, Leanne K., Christaki, Urania, Georges, Clément, Obernosterer, Ingrid, Quéguiner, Bernard

“…In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to…”
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Interactions between seasonality and oceanic forcing drive the phytoplankton variability in the tropical-temperate transition zone (~30°S) of Eastern Australia by Armbrecht, Linda H., Schaeffer, Amandine, Roughan, Moninya, Armand, Leanne K.

“…The East Australian Current (EAC) has been shown to be warming rapidly, which is expected to cause latitudinal shifts in phytoplankton abundance, distribution…”
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Distributions of highly branched isoprenoid alkenes and other algal lipids in surface waters from East Antarctica: Further insights for biomarker-based paleo sea-ice reconstruction by Smik, Lukas, Belt, Simon T., Lieser, Jan L., Armand, Leanne K., Leventer, Amy

“…•Highly branched isoprenoid (HBI) alkenes measured in Antarctic surface waters.•HBI diene identified in surface waters from regions of seasonal sea ice…”
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First observations of living sea-ice diatom agglomeration to tintinnid loricae in East Antarctica by Armbrecht, Linda H., Eriksen, Ruth, Leventer, Amy, Armand, Leanne K.

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Phytoplankton composition under contrasting oceanographic conditions: Upwelling and downwelling (Eastern Australia) by Armbrecht, Linda H., Roughan, Moninya, Rossi, Vincent, Schaeffer, Amandine, Davies, Peter L., Waite, Anya M., Armand, Leanne K.

“…Phytoplankton abundance and distribution along the east coast of Australia are driven primarily by the southward flowing East Australian Current (EAC), which…”
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Statistical modeling of Southern Ocean marine diatom proxy and winter sea ice data: Model comparison and developments by Ferry, Alexander J., Prvan, Tania, Jersky, Brian, Crosta, Xavier, Armand, Leanne K.

“…•Tenfold and spatially independent holdout cross-validation of current statistical models.•Current models fail to adequately fit the southern ocean diatom…”
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Diversity and taxonomic identification of Shionodiscus spp. in the Australian sector of the Subantarctic Zone by Wilks, Jessica V., Armand, Leanne K.

“…Diatoms are siliceous phytoplankton that play a major role in global carbon fixation, as well as forming the basis of most marine food webs. In the Southern…”
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The Southern Ocean Radiolarian (SO-RAD) dataset: a new compilation of modern radiolarian census data by Lawler, Kelly-Anne, Cortese, Giuseppe, Civel-Mazens, Matthieu, Bostock, Helen, Crosta, Xavier, Leventer, Amy, Lowe, Vikki, Rogers, John, Armand, Leanne K

“…Radiolarians (holoplanktonic protozoa) preserved in marine sediments are commonly used as palaeoclimate proxies for reconstructing past Southern Ocean…”
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A new approach to testing the agreement of two phytoplankton quantification techniques: Microscopy and CHEMTAX by Armbrecht, Linda H., Wright, Simon W., Petocz, Peter, Armand, Leanne K.

“…Strengths of numerical relationships between phytoplankton abundance estimates made by microscopy and CHEMTAX have often been tested using regression analysis…”
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Comparison of the cross-shelf phytoplankton distribution of two oceanographically distinct regions off Australia by Armbrecht, Linda H., Thompson, Peter A., Wright, Simon W., Schaeffer, Amandine, Roughan, Moninya, Henderiks, Jorijntje, Armand, Leanne K.

“…The coastline of Australia spans tropical to temperate latitudes and encompasses a highly diverse phytoplankton community. Yet little is known about…”
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The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species by Crosta, Xavier, Romero, Oscar, Armand, Leanne K., Pichon, Jean-Jacques

“…Diatom assemblages from 228 core-top samples were investigated to determine the modern geographic distributions of 10 major open ocean species or species…”
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Abundance and richness of key Antarctic seafloor fauna correlates with modelled food availability by Jansen, Jan, Hill, Nicole A., Dunstan, Piers K., McKinlay, John, Sumner, Michael D., Post, Alexandra L., Eléaume, Marc P., Armand, Leanne K., Warnock, Jonathan P., Galton-Fenzi, Benjamin K., Johnson, Craig R.

“…Most seafloor communities at depths below the photosynthesis zone rely on food that sinks through the water column. However, the nature and strength of this…”
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Diatoms preserved in surface sediments of the northeastern Kerguelen Plateau by Armand, Leanne K., Crosta, X., Quéguiner, B., Mosseri, J., Garcia, N.

“…An “island mass effect” was observed from the sedimentary distribution of diatoms on the northeastern Kerguelen Plateau. Five new samples placed in context to…”
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Indices based on silicoflagellate assemblages offer potential for paleo-reconstructions of the main oceanographic zones of the Southern Ocean by Rigual-Hernández, Andrés S., Trull, Thomas W., McCartney, Kevin, Ballegeer, Anne-Marie, Lawler, Kelly-Anne, Bray, Stephen G., Armand, Leanne K.

“…This study reports detailed silicoflagellate assemblage composition and annual seasonal flux from sediment traps at four locations along a transect across the…”
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