Search Results - "Kemnitz, Nathaniel"

Increasing Salt Marsh Elevation Using Sediment Augmentation: Critical Insights from Surface Sediments and Sediment Cores by Fard, Elizabeth, Brown, Lauren N., Ambrose, Richard F., Whitcraft, Christine, Thorne, Karen M., Kemnitz, Nathaniel J., Hammond, Douglas E., MacDonald, Glen M.

“…Sea-level rise is particularly concerning for tidal wetlands that reside within an area with steep topography or are constrained by human development and…”
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Spatial patterns of benthic silica flux in the North Pacific reflect upper ocean production by Hou, Yi, Hammond, Douglas E., Berelson, William M., Kemnitz, Nathaniel, Adkins, Jess F., Lunstrum, Abby

“…Diatoms are the dominant algal group that cycles dissolved silicic acid in the ocean; they also play an important role in the oceanic carbon cycle. It is…”
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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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Actinium and radium fluxes from the seabed in the northeast Pacific Basin by Kemnitz, Nathaniel, Hammond, Douglas E., Henderson, Paul, Le Roy, Emilie, Charette, Matthew, Moore, Willard, Anderson, Robert F., Fleisher, Martin Q., Leal, Anne, Black, Erin, Hayes, Christopher T., Adkins, Jess, Berelson, William, Bian, Xiaopeng

“…Five sediment cores were collected along a cruise tract from Hawaii to Alaska in August 2017 (C-Disk-IV cruise) with the objective of characterizing the…”
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Early diagenetic processes in an iron-dominated marine depositional system by Figueroa, Maria C., van de Velde, Sebastiaan J., Gregory, Daniel D., Lemieux, Sydnie, Drake, Jeana, Treude, Tina, Kemnitz, Nathaniel, Berelson, William, Choumiline, Konstantin, Bates, Steven, Kukkadapu, Ravi, Fogel, Marilyn, Riedinger, Natascha, Lyons, Timothy W.

“…The early diagenetic interplay between reactive iron, sulfur, and organic matter in the bathymetrically isolated Santa Monica Basin (SMB) sediments are…”
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A benthic source of isotopically heavy Ni from continental margins and implications for global ocean Ni isotope mass balance by Bian, Xiaopeng, Yang, Shun-Chung, Raad, Robert J., Lunstrum, Abby M., Dong, Sijia, Meng, Haoran, Kemnitz, Nathaniel, Rollins, Nick E., Cetiner, Jaclyn EP, Pavia, Frank J., Hammond, Douglas E., Adkins, Jess F., Berelson, William M., John, Seth G.

“…•Porewater Ni isotope composition (δ60Ni) can be heavier than deep seawater.•Dissolution of detrital materials in marine sediments may supply dNi to pore…”
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Early diagenetic processes in an iron-dominated marine depositional system by Figueroa, Maria C., van de Velde, Sebastiaan J., Gregory, Daniel D., Lemieux, Sydnie, Drake, Jeana, Treude, Tina, Kemnitz, Nathaniel, Berelson, William, Choumiline, Konstantin, Bates, Steven, Kukkadapu, Ravi K., Fogel, Marilyn, Riedinger, Natascha, Lyons, Timothy W.

“…The early diagenetic interplay between reactive iron, sulfur, and organic matter in the bathymetrically isolated Santa Monica Basin (SMB) sediments are…”
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Controls on Dissolved Barium and Radium‐226 Distributions in the Pacific Ocean Along GEOTRACES GP15 by Le Roy, Emilie, Charette, Matthew A., Henderson, Paul B., Shiller, Alan M., Moore, Willard S., Kemnitz, Nathaniel, Hammond, Douglas E., Horner, Tristan J.

“…Radium‐226(226Ra) and barium (Ba) exhibit similar chemical behaviors and distributions in the marine environment, serving as valuable tracers of water masses,…”
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Modeling Deep Ocean Water and Sediment Dynamics in the Eastern Pacific Ocean Using Actinium-227 and Other Naturally Occurring Radioisotopes by Kemnitz, Nathaniel James

“…The disequilibrium that occurs within the U and Th-decay series in marine environments can be exploited to give rates of transport of dynamic processes. To…”
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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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Enriched Regions of 228Ra Along the U.S. GEOTRACES Pacific Meridional Transect (GP15) by Moore, Willard S., Charette, Matthew A., Henderson, Paul B., Hammond, Douglas E., Kemnitz, Nathaniel, Le Roy, Emilie, Kwon, Eun Young, Hult, Mikael

“…The half‐life of 228Ra (5.7 years) aligns well with near‐surface and near‐bottom ocean mixing timescales. Because 228Ra is sourced from sediments, regions of…”
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Evidence of changes in sedimentation rate and sediment fabric in a low-oxygen setting: Santa Monica Basin, CA by Kemnitz, Nathaniel, Berelson, William M, Hammond, Douglas E, Morine, Laura, Figueroa, Maria, Lyons, Timothy W, Scharf, Simon, Rollins, Nick, Petsios, Elizabeth, Lemieux, Sydnie, Treude, Tina

“…The Southern California Bight is adjacent to one of the world's largest urban areas, Los Angeles. As a consequence, anthropogenic impacts could disrupt local…”
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Enriched Regions of 228 Ra Along the U.S. GEOTRACES Pacific Meridional Transect (GP15) by Moore, Willard S., Charette, Matthew A., Henderson, Paul B., Hammond, Douglas E., Kemnitz, Nathaniel, Le Roy, Emilie, Kwon, Eun Young, Hult, Mikael

“…The half‐life of 228 Ra (5.7 years) aligns well with near‐surface and near‐bottom ocean mixing timescales. Because 228 Ra is sourced from sediments, regions of…”
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Actinium-227 as a Tracer for Mixing in the Deep Northeast Pacific by Kemnitz, Nathaniel James

“…227Ac (t1/2 = 22 y) is produced by decay of 231Pa (t1/2 = 32,800 y). 231Pa is scavenged in the water column by falling particulates that carry it to sediments,…”
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