Search Results - "Nicholson, David P"

The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean by Palevsky, Hilary I., Quay, Paul D., Lockwood, Deirdre E., Nicholson, David P.

“…We measured triple oxygen isotopes and oxygen/argon dissolved gas ratios as nonincubation‐based geochemical tracers of gross oxygen production (GOP) and net…”
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Quantifying subtropical North Pacific gyre mixed layer primary productivity from Seaglider observations of diel oxygen cycles by Nicholson, David P., Wilson, Samuel T., Doney, Scott C., Karl, David M.

“…Using autonomous underwater gliders, we quantified diurnal periodicity in dissolved oxygen, chlorophyll, and temperature in the subtropical North Pacific near…”
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River Inflow Dominates Methane Emissions in an Arctic Coastal System by Manning, Cara C., Preston, Victoria L., Jones, Samantha F., Michel, Anna P. M., Nicholson, David P., Duke, Patrick J., Ahmed, Mohamed M. M., Manganini, Kevin, Else, Brent G. T., Tortell, Philippe D.

“…We present a year‐round time series of dissolved methane (CH4), along with targeted observations during ice melt of CH4 and carbon dioxide (CO2) in a river and…”
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Revising Estimates of Aquatic Gross Oxygen Production by the Triple Oxygen Isotope Method to Incorporate the Local Isotopic Composition of Water by Manning, Cara C., Howard, Evan M., Nicholson, David P., Ji, Brenda Y., Sandwith, Zoe O., Stanley, Rachel H. R.

“…Measurement of the triple oxygen isotope (TOI) composition of O2 is an established method for quantifying gross oxygen production (GOP) in natural waters. A…”
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Ocean Time Series Observations of Changing Marine Ecosystems: An Era of Integration, Synthesis, and Societal Applications by Benway, Heather M., Lorenzoni, Laura, White, Angelicque E., Fiedler, Björn, Levine, Naomi M., Nicholson, David P., DeGrandpre, Michael D., Sosik, Heidi M., Church, Matthew J., O’Brien, Todd D., Leinen, Margaret, Weller, Robert A., Karl, David M., Henson, Stephanie A., Letelier, Ricardo M.

“…Sustained ocean time series are critical for characterizing marine ecosystem shifts in a time of accelerating, and at times unpredictable, changes. They…”
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Discrepant estimates of primary and export production from satellite algorithms, a biogeochemical model, and geochemical tracer measurements in the North Pacific Ocean by Palevsky, Hilary I., Quay, Paul D., Nicholson, David P.

“…Estimates of primary and export production (PP and EP) based on satellite remote sensing algorithms and global biogeochemical models are widely used to provide…”
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Reviews and syntheses: expanding the global coverage of gross primary production and net community production measurements using Biogeochemical-Argo floats by Izett, Robert W, Fennel, Katja, Stoer, Adam C, Nicholson, David P

“…This paper provides an overview and demonstration of emerging float-based methods for quantifying gross primary production (GPP) and net community production…”
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Using Noble Gases to Assess the Ocean's Carbon Pumps by Hamme, Roberta C, Nicholson, David P, Jenkins, William J, Emerson, Steven R

“…Natural mechanisms in the ocean, both physical and biological, concentrate carbon in the deep ocean, resulting in lower atmospheric carbon dioxide. The signals…”
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The North Atlantic Biological Pump: INSIGHTS FROM THE OCEAN OBSERVATORIES INITIATIVE IRMINGER SEA ARRAY by Palevsky, Hilary I., Nicholson, David P.

“…The biological pump plays a key role in the global carbon cycle by transporting photosynthetically fixed organic carbon into the deep ocean, where it can be…”
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Rapid Mapping of Dissolved Methane and Carbon Dioxide in Coastal Ecosystems Using the ChemYak Autonomous Surface Vehicle by Nicholson, David P, Michel, Anna P. M, Wankel, Scott D, Manganini, Kevin, Sugrue, Rebecca A, Sandwith, Zoe O, Monk, Samuel A

“…Coastal ecosystems host high levels of primary productivity leading to exceptionally dynamic elemental cycling in both water and sediments. In such…”
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Dissolved gases in the deep North Atlantic track ocean ventilation processes by Seltzer, Alan M, Nicholson, David P, Smethie, William M, Tyne, Rebecca L, Le Roy, Emilie, Stanley, Rachel H R, Stute, Martin, Barry, Peter H, McPaul, Katelyn, Davidson, Perrin W, Chang, Bonnie X, Rafter, Patrick A, Lethaby, Paul, Johnson, Rod J, Khatiwala, Samar, Jenkins, William J

“…Gas exchange between the atmosphere and ocean interior profoundly impacts global climate and biogeochemistry. However, our understanding of the relevant…”
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Changes in gross oxygen production, net oxygen production, and air-water gas exchange during seasonal ice melt in Whycocomagh Bay, a Canadian estuary in the Bras d'Or Lake system by Manning, Cara C, Stanley, Rachel H. R, Nicholson, David P, Loose, Brice, Lovely, Ann, Schlosser, Peter, Hatcher, Bruce G

“…Sea ice is an important control on gas exchange and primary production in polar regions. We measured net oxygen production (NOP) and gross oxygen production…”
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Oxygen optodes on oceanographic moorings: recommendations for deployment and in situ calibration by Miller, Una Kim, Fogaren, Kristen E., Atamanchuk, Dariia, Johnson, Clare, Koelling, Jannes, Le Bras, Isabela, Lindeman, Margaret, Nagao, Hiroki, Nicholson, David P., Palevsky, Hilary, Park, Ellen, Yoder, Meg, Palter, Jaime B.

“…Increasing interest in the deployment of optical oxygen sensors, or optodes, on oceanographic moorings reflects the value of dissolved oxygen (DO) measurements…”
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Evaluating triple oxygen isotope estimates of gross primary production at the Hawaii Ocean Time-series and Bermuda Atlantic Time-series Study sites by Nicholson, David P., Stanley, Rachel H. R., Barkan, Eugeni, Karl, David M., Luz, Boaz, Quay, Paul D., Doney, Scott C.

“…The triple oxygen isotopic composition of dissolved oxygen (17Δ) is a promising tracer of gross oxygen productivity (P) in the ocean. Recent studies have…”
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Observations of Shallow Methane Bubble Emissions From Cascadia Margin by Michel, Anna P. M., Preston, Victoria L., Fauria, Kristen E., Nicholson, David P.

“…Open questions exist about whether methane emitted from active seafloor seeps reaches the surface ocean to be subsequently ventilated to the atmosphere. Water…”
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Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012 by Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Bidigare, Robert R., Church, Matthew J., del Valle, Daniela A., Dyhrman, Sonya T., Ferrón, Sara, Fitzsimmons, Jessica N., Juranek, Laurie W., Kolber, Zbigniew S., Letelier, Ricardo M., Martínez-García, Sandra, Nicholson, David P., Richards, Kelvin J., Rii, Yoshimi M., Rouco, Mónica, Viviani, Donn A., White, Angelicque E., Zehr, Jonathan P., Karl, David M.

“…Time‐series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Time‐series program has…”
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Impact of recently upwelled water on productivity investigated using in situ and incubation‐based methods in Monterey Bay by Manning, Cara C., Stanley, Rachel H. R., Nicholson, David P., Smith, Jason M., Timothy Pennington, J., Fewings, Melanie R., Squibb, Michael E., Chavez, Francisco P.

“…Photosynthetic conversion of CO2 to organic carbon and the transport of this carbon from the surface to the deep ocean is an important regulator of atmospheric…”
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Spatial and temporal variations in atmospheric gas flux from the Hudson River: the estuarine gas exchange maximum by Scully, Malcolm E., Michel, Anna P. M., Nicholson, David P., Traylor, Shawnee

“…A unique combination of data collected from fixed instruments, spatial surveys, and a long‐term observing network in the Hudson River demonstrate the…”
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Surface gas exchange determined from an aquatic eddy covariance floating platform by Long, Matthew H., Nicholson, David P.

“…We present a new approach to quantifying air‐water flux and gas transfer velocity (k600) from underwater eddy covariance (EC) of dissolved oxygen. EC fluxes…”
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Air calibration of an oxygen optode on an underwater glider by Nicholson, David P., Feen, Melanie L.

“…An Aanderaa Data Instruments 4831 oxygen optode was configured on an underwater glider such that the optode extended into the atmosphere during each glider…”
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