Search Results - "Rollins, Nick"

Catalysis and chemical mechanisms of calcite dissolution in seawater by Subhas, Adam V., Adkins, Jess F., Rollins, Nick E., Naviaux, John, Erez, Jonathan, Berelson, William M.

“…Near-equilibrium calcite dissolution in seawater contributes significantly to the regulation of atmospheric CO₂ on 1,000-y timescales. Despite many studies on…”
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Benthic fluxes from hypoxia-influenced Gulf of Mexico sediments: Impact on bottom water acidification by Berelson, William M., McManus, James, Severmann, Silke, Rollins, Nick

“…Benthic fluxes are reported from 8 sites on the shelf and slope of the Gulf of Mexico (GoM) in the region near the Mississippi River delta. Benthic landers,…”
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Shallow Calcium Carbonate Cycling in the North Pacific Ocean by Subhas, Adam V., Dong, Sijia, Naviaux, John D., Rollins, Nick E., Ziveri, Patrizia, Gray, William, Rae, James W. B., Liu, Xuewu, Byrne, Robert H., Chen, Sang, Moore, Christopher, Martell‐Bonet, Loraine, Steiner, Zvi, Antler, Gilad, Hu, Huanting, Lunstrum, Abby, Hou, Yi, Kemnitz, Nathaniel, Stutsman, Johnny, Pallacks, Sven, Dugenne, Mathilde, Quay, Paul D., Berelson, William M., Adkins, Jess F.

“…The cycling of biologically produced calcium carbonate (CaCO3) in the ocean is a fundamental component of the global carbon cycle. Here, we present…”
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Mercury contents and isotope ratios from diverse depositional environments across the Triassic–Jurassic Boundary: Towards a more robust mercury proxy for large igneous province magmatism by Yager, Joyce A., West, A. Joshua, Thibodeau, Alyson M., Corsetti, Frank A., Rigo, Manuel, Berelson, William M., Bottjer, David J., Greene, Sarah E., Ibarra, Yadira, Jadoul, Flavio, Ritterbush, Kathleen A., Rollins, Nick, Rosas, Silvia, Di Stefano, Pietro, Sulca, Debbie, Todaro, Simona, Wynn, Peter, Zimmermann, Laura, Bergquist, Bridget A.

“…Mercury is gaining prominence as a proxy for large igneous province (LIP) volcanism in the sedimentary record. Despite temporal overlap between some mass…”
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Living to Lithified: Construction and Preservation of Silicified Biomarkers by Rasmussen, Kalen L., Thieringer, Patrick H., Nevadomski, Sophia, Martinez, Aaron M., Dawson, Katherine S., Corsetti, Frank A., Zheng, Xin‐Yuan, Lv, Yiwen, Chen, Xinyang, Celestian, Aaron J., Berelson, William M., Rollins, Nick E., Spear, John R.

“…ABSTRACT Whole microorganisms are rarely preserved in the fossil record but actively silicifying environments like hot springs provide an opportunity for…”
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Quantification of fossil fuel CO2 from combined CO, δ13CO2 and Δ14CO2 observations by Kim, Jinsol, Miller, John B, Miller, Charles E, Lehman, Scott J, Michel, Sylvia E, Yadav, Vineet, Rollins, Nick E, Berelson, William M

“…We present a new method for partitioning observed CO2 enhancements (CO2xs) into fossil and biospheric fractions (Cff and Cbio) based on measurements of CO and…”
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Arctic Permafrost Thawing Enhances Sulfide Oxidation by Kemeny, Preston Cosslett, Li, Gen K., Douglas, Madison, Berelson, William, Chadwick, Austin J., Dalleska, Nathan F., Lamb, Michael P., Larsen, William, Magyar, John S., Rollins, Nick E., Rowland, Joel, Smith, M. Isabel, Torres, Mark A., Webb, Samuel M., Fischer, Woodward W., West, A. Joshua

“…Permafrost degradation is altering biogeochemical processes throughout the Arctic. Thaw‐induced changes in organic matter transformations and mineral…”
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A Mechanistic Study of Carbonic Anhydrase‐Enhanced Calcite Dissolution by Dong, Sijia, Berelson, William M., Teng, H. Henry, Rollins, Nick E., Pirbadian, Sahand, El‐Naggar, Mohamed Y., Adkins, Jess F.

“…Carbonic anhydrase (CA) has been shown to promote calcite dissolution (Liu, 2001, https://doi.org/10.1111/j.1755-6724.2001.tb00531.x; Subhas et al., 2017,…”
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Duration of and decoupling between carbon isotope excursions during the end-Triassic mass extinction and Central Atlantic Magmatic Province emplacement by Yager, Joyce A., West, A. Joshua, Corsetti, Frank A., Berelson, William M., Rollins, Nick E., Rosas, Silvia, Bottjer, David J.

“…Changes in δ13Ccarb and δ13Corg from marine strata occur globally in association with the end-Triassic mass extinction and the emplacement of the Central…”
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Meter-Scale Early Diagenesis of Organic Matter Buried Within Deep-Sea Sediments Beneath the Amazon River Plume by Chong, Lauren S., Berelson, William M., McManus, James, Rollins, Nick E.

“…Gravity cores and multi-cores were collected from the Demerara Abyssal plain to examine meter-scale downcore features of early diagenesis in the sediments and…”
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A novel determination of calcite dissolution kinetics in seawater by Subhas, Adam V., Rollins, Nick E., Berelson, William M., Dong, Sijia, Erez, Jonathan, Adkins, Jess F.

“…We present a novel determination of the dissolution kinetics of inorganic calcite in seawater. We dissolved 13C-labeled calcite in unlabeled seawater, and…”
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Temperature dependence of calcite dissolution kinetics in seawater by Naviaux, John D., Subhas, Adam V., Rollins, Nick E., Dong, Sijia, Berelson, William M., Adkins, Jess F.

“…Knowledge of the mechanism of calcite dissolution in seawater is a critical component of our understanding of the changing global carbon budget. Towards this…”
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A kinetic pressure effect on calcite dissolution in seawater by Dong, Sijia, Subhas, Adam V., Rollins, Nick E., Naviaux, John D., Adkins, Jess F., Berelson, William M.

“…This study provides laboratory data of calcite dissolution rate as a function of seawater undersaturation state (1 − Ω) under variable pressure. 13C-labeled…”
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The carbonic anhydrase activity of sinking and suspended particles in the North Pacific Ocean by Subhas, Adam V., Adkins, Jess F., Dong, Sijia, Rollins, Nick E., Berelson, William M.

“…The enzyme carbonic anhydrase (CA) is crucial to many physiological processes involving CO₂, from photosynthesis and respiration, to calcification and CaCO₃…”
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An atomic force microscopy study of calcite dissolution in seawater by Dong, Sijia, Berelson, William M., Adkins, Jess F., Rollins, Nick E., Naviaux, John D., Pirbadian, Sahand, El-Naggar, Mohamed Y., Teng, H. Henry

“…We present the first examination of calcite dissolution in seawater using Atomic Force Microscopy (AFM). We quantify step retreat velocity and etch pit density…”
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Quantification of fossil fuel CO 2 from combined CO, δ 13 CO 2 and Δ 14 CO 2 observations by Kim, Jinsol, Miller, John B., Miller, Charles E., Lehman, Scott J., Michel, Sylvia E., Yadav, Vineet, Rollins, Nick E., Berelson, William M.

“…We present a new method for partitioning observed CO2 enhancements (CO2xs) into fossil and biospheric fractions (Cff and Cbio) based on measurements of CO and…”
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Quantification of fossil fuel CO.sub.2 from combined CO, [delta].sup.13CO.sub.2 and Î.sup.14CO.sub.2 observations by Kim, Jinsol, Miller, John B, Miller, Charles E, Lehman, Scott J, Michel, Sylvia E, Yadav, Vineet, Rollins, Nick E, Berelson, William M

“…We present a new method for partitioning observed CO.sub.2 enhancements (CO.sub.2 xs) into fossil and biospheric fractions (C.sub.ff and C.sub.bio) based on…”
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Calcite dissolution rates in seawater: Lab vs. in-situ measurements and inhibition by organic matter by Naviaux, John D., Subhas, Adam V., Dong, Sijia, Rollins, Nick E., Liu, Xuewu, Byrne, Robert H., Berelson, William M., Adkins, Jess F.

“…Ocean acidification from fossil fuel burning is lowering the mean global ocean saturation state (Ω = Ca2+CO32−Ksp′), thus increasing the thermodynamic driving…”
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Aragonite dissolution kinetics and calcite/aragonite ratios in sinking and suspended particles in the North Pacific by Dong, Sijia, Berelson, William M., Rollins, Nick E., Subhas, Adam V., Naviaux, John D., Celestian, Aaron J., Liu, Xuewu, Turaga, Nitya, Kemnitz, Nathaniel J., Byrne, Robert H., Adkins, Jess F.

“…The lack of consensus on CaCO3 dissolution rates and calcite to aragonite production and export ratios in the ocean poses a significant barrier for the…”
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Thermal design and analysis of a passive modular molten salt microreactor concept by Larsen, Andrew, Clayton, Braden, Gunnell, LaGrande, Bryner, Austin, Brown, Logan, Rollins, Nick, Memmott, Matthew

“…•45MWth molten salt reactor for remote use with total passivity in transients.•Steady state temperatures remain within safe limits for all components.•Reactor…”
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