Search Results - "Lapham, Laura L."

A simple headspace equilibration method for measuring dissolved methane by Magen, Cédric, Lapham, Laura L., Pohlman, John W., Marshall, Kathleen, Bosman, Samantha, Casso, Michael, Chanton, Jeffrey P.

“…Dissolved methane concentrations in the ocean are close to equilibrium with the atmosphere. Because methane is only sparingly soluble in seawater, measuring it…”
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Microbial activity in the marine deep biosphere: progress and prospects by Orcutt, Beth N, Larowe, Douglas E, Biddle, Jennifer F, Colwell, Frederick S, Glazer, Brian T, Reese, Brandi Kiel, Kirkpatrick, John B, Lapham, Laura L, Mills, Heath J, Sylvan, Jason B, Wankel, Scott D, Wheat, C Geoff

“…The vast marine deep biosphere consists of microbial habitats within sediment, pore waters, upper basaltic crust and the fluids that circulate throughout it. A…”
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Microbial response to oil enrichment in Gulf of Mexico sediment measured using a novel long-term benthic lander system by Orcutt, Beth N., Lapham, Laura L., Delaney, Jennifer, Sarode, Neha, Marshall, Kathleen S., Whaley-Martin, Kelly J., Slater, Greg, Wheat, C. Geoff, Girguis, Peter R.

“…Weathered crude oil sank to the seafloor following the Deepwater Horizon disaster in 2010, removing this oil from further physical and photo-chemical…”
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Controls on Oxygen Variability and Depletion in the Patuxent River Estuary by Dreiss, Allison, Azarnivand, Amir Reza, Hildebrand, Anna, Pourreza Ahmadi, Seyedeh Fardis, Ali, Syeda Sadia, Lucchese, Veronica Malabanan, Zhang, Qian, Lapham, Laura L., Woodland, Ryan J., Harris, Lora, Testa, Jeremy M.

“…Oxygen depletion in coastal waters is increasing globally due primarily to eutrophication and warming. Hypoxia responses to nutrient loading and climate change…”
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Control of hydrogen concentrations by microbial sulfate reduction in two contrasting anoxic coastal sediments by Coon, Gage R., Williams, Leketha C., Matthews, Adrianna, Diaz, Roberto, Kevorkian, Richard T., LaRowe, Douglas E., Steen, Andrew D., Lapham, Laura L., Lloyd, Karen G.

“…Introduction Molecular hydrogen is produced by the fermentation of organic matter and consumed by organisms including hydrogenotrophic methanogens and sulfate…”
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Methane under-saturated fluids in deep-sea sediments: Implications for gas hydrate stability and rates of dissolution by Lapham, Laura L., Chanton, Jeffrey P., Chapman, Ross, Martens, Christopher S.

“…Deep-sea sediments contain Earth's largest reservoir of methane (CH 4, 3000 GTons C) trapped within ice-like crystals known as gas hydrates. Understanding the…”
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Multiple resolution seismic imaging of a shallow hydrocarbon plumbing system, Woolsey Mound, Northern Gulf of Mexico by Macelloni, Leonardo, Simonetti, Antonello, Knapp, James H., Knapp, Camelia C., Lutken, Carol B., Lapham, Laura L.

“…The northern Gulf of Mexico is dominated by salt tectonics, resulting fracturing and numerous seafloor seeps and vents. Woolsey Mound, site of the Gulf of…”
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Source, Migration Pathways, and Atmospheric Release of Geologic Methane Associated With the Complex Permafrost Regimes of the Outer Mackenzie River Delta, Northwest Territories, Canada by Dallimore, Scott R., Lapham, Laura L., Côté, Michelle M., Bowen, Robert, MacLeod, Roger, McIntosh Marcek, Hadley A., Wheat, C. Geoff, Collett, Timothy S.

“…Sources and fluxes of methane to the atmosphere from permafrost are significant but poorly constrained in global climate models. We present data collected from…”
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Biogeochemical Dynamics of a Glaciated High‐Latitude Wetland by Buser‐Young, Jessica Z., Peck, Erin K., Chace, Peter, Lapham, Laura L., Vizza, Carmella, Colwell, Frederick S.

“…High‐latitude, coastal wetland biogeochemistry is dynamic in response to climate change, and yet we do not understand, and thus cannot fully predict, how…”
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Spatial distribution of seafloor bio-geological and geochemical processes as proxies of fluid flux regime and evolution of a carbonate/hydrates mound, northern Gulf of Mexico by Macelloni, Leonardo, Brunner, Charlotte A., Caruso, Simona, Lutken, Carol B., D'Emidio, Marco, Lapham, Laura L.

“…Woolsey Mound, a carbonate/hydrate complex of cold seeps, vents, and seafloor pockmarks in Mississippi Canyon Block 118, is the site of the Gulf of Mexico…”
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Comparing Sediment Microbial Communities of Arctic Beaver Ponds to Tundra Lakes and Streams by Shannon, Kelly C., Christman, Natasha R., Crump, Byron C., Carey, Michael P., Koch, Joshua, Lapham, Laura L., O’Donnell, Jonathan, Poulin, Brett A., Tape, Ken D., Clark, Jason A., Colwell, Frederick S.

“…In recent decades the habitat of North American beaver (Castor canadensis) has expanded from boreal forests into Arctic tundra ecosystems. Beaver ponds in…”
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Hidden Processes During Seasonal Isolation of a High-Altitude Watershed by Buser-Young, Jessica Z., Lapham, Laura L., Thurber, Andrew R., Williams, Kenneth H., Colwell, Frederick S.

“…Biogeochemical processes capable of altering global carbon systems occur frequently in Earth’s Critical Zone–the area spanning from vegetation canopy to…”
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Pressurized laboratory experiments show no stable carbon isotope fractionation of methane during gas hydrate dissolution and dissociation by Lapham, Laura L., Wilson, Rachel M., Chanton, Jeffrey P.

“…The stable carbon isotopic ratio of methane (δ13C‐CH4) recovered from marine sediments containing gas hydrate is often used to infer the gas source and…”
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The Effects of Engineered Aeration on Atmospheric Methane Flux From a Chesapeake Bay Tidal Tributary by Lapham, Laura L., Hobbs, Edward A., Testa, Jeremy M., Heyes, Andrew, Forsyth, Melinda K., Hodgkins, Casey, Szewczyk, Curtis, Harris, Lora A.

“…Engineered aeration is one solution for increasing oxygen concentrations in highly eutrophic estuaries that undergo seasonal hypoxia. Although there are…”
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Microbial Greenhouse Gas Dynamics Associated With Warming Coastal Permafrost, Western Canadian Arctic by Lapham, Laura L., Dallimore, Scott R., Magen, Cédric, Henderson, Lillian C., Powers, Leanne C., Gonsior, Michael, Clark, Brittany, Côté, Michelle, Fraser, Paul, Orcutt, Beth N.

“…Permafrost sediments contain one of the largest reservoirs of organic carbon on Earth that is relatively stable when it remains frozen. As air temperatures…”
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Measuring Temporal Variability in Pore-Fluid Chemistry To Assess Gas Hydrate Stability: Development of a Continuous Pore-Fluid Array by Lapham, Laura L, Chanton, Jeffrey P, Martens, Christopher S, Higley, Paul D, Jannasch, Hans W, Woolsey, J. Robert

“…A specialized pore-fluid array (PFA) sampler was designed to collect and store pore fluids to monitor temporal changes of ions and gases in gas hydrate bearing…”
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Upward advection rates and methane fluxes, oxidation, and sources at two Gulf of Mexico brine seeps by Lapham, Laura L., Alperin, Marc, Chanton, Jeffrey, Martens, Chris

“…Pore water chloride, sulfate, and methane profiles were measured at two Gulf of Mexico brine seeps to determine upward fluid advection rates and to quantify…”
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Oxygenation of a karst subterranean estuary during a tropical cyclone: mechanisms and implications for the carbon cycle by Brankovits, David, Pohlman, John W., Lapham, Laura L.

“…Seasonal precipitation affects carbon turnover and methane accumulation in karst subterranean estuaries, the region of coastal carbonate aquifers where…”
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Molecular and optical characterization reveals the preservation and sulfurization of chemically diverse porewater dissolved organic matter in oligohaline and brackish Chesapeake Bay sediments by Powers, Leanne C., Lapham, Laura L., Malkin, Sairah Y., Heyes, Andrew, Schmitt-Kopplin, Philippe, Gonsior, Michael

“…[Display omitted] •Upper bay PDOM molecular and fluorescence signatures reflect a terrestrial source.•Mid bay PDOM is indicative of an autochthonous…”
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Gas hydrate dissolution rates quantified with laboratory and seafloor experiments by Lapham, Laura L., Wilson, Rachel M., MacDonald, Ian R., Chanton, Jeffrey P.

“…Methane hydrates are stable at high pressure, low temperature, and saturated methane concentrations. However, natural hydrates exist at the seafloor where…”
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