Search Results - "Letelier, Ricardo M."

Microbial oceanography of anoxic oxygen minimum zones by Ulloa, Osvaldo, Canfield, Donald E, DeLong, Edward F, Letelier, Ricardo M, Stewart, Frank J

“…Vast expanses of oxygen-deficient and nitrite-rich water define the major oxygen minimum zones (OMZs) of the global ocean. They support diverse microbial…”
Get full text

Predictable and efficient carbon sequestration in the North Pacific Ocean supported by symbiotic nitrogen fixation by Karl, David M., Church, Matthew J., Dore, John E., Letelier, Ricardo M., Mahaffey, Claire

“…The atmospheric and deep sea reservoirs of carbon dioxide are linked via physical, chemical, and biological processes. The last of these include…”
Get full text

Coupling carbon and energy fluxes in the North Pacific Subtropical Gyre by Grabowski, Eric, Letelier, Ricardo M., Laws, Edward A., Karl, David M.

“…The major biogeochemical cycles of marine ecosystems are driven by solar energy. Energy that is initially captured through photosynthesis is transformed and…”
Get full text

Temporal variability of nitrogen fixation and particulate nitrogen export at Station ALOHA by Böttjer, Daniela, Dore, John E., Karl, David M., Letelier, Ricardo M., Mahaffey, Claire, Wilson, Samuel T., Zehr, Jonathan, Church, Matthew J.

“…We present nearly 9 yrs (June 2005–December 2013) of measurements of upper-ocean (0 m to 125 m) dinitrogen (N₂) fixation rates, coupled with particulate…”
Get full text

Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre by Letelier, Ricardo M., Björkman, Karin M., Church, Matthew J., Hamilton, Douglas S., Mahowald, Natalie M., Scanza, Rachel A., Schneider, Niklas, White, Angelicque E., Karl, David M.

“…The supply of nutrients is a fundamental regulator of ocean productivity and carbon sequestration. Nutrient sources, sinks, residence times, and elemental…”
Get full text

Simulating the global distribution of nitrogen isotopes in the ocean by Somes, Christopher J., Schmittner, Andreas, Galbraith, Eric D., Lehmann, Moritz F., Altabet, Mark A., Montoya, Joseph P., Letelier, Ricardo M., Mix, Alan C., Bourbonnais, Annie, Eby, Michael

“…We present a new nitrogen isotope model incorporated into the three‐dimensional ocean component of a global Earth system climate model designed for millennial…”
Get full text

Physical forcing of nitrogen fixation and diazotroph community structure in the North Pacific subtropical gyre by Church, Matthew J., Mahaffey, Claire, Letelier, Ricardo M., Lukas, Roger, Zehr, Jonathan P., Karl, David M.

“…Dinitrogen (N2) fixing microorganisms (termed diazotrophs) exert important control on the ocean carbon cycle. However, despite increased awareness on the roles…”
Get full text

Estimating the compensation irradiance in the ocean: The importance of accounting for non-photosynthetic uptake of inorganic carbon by Laws, Edward A., Letelier, Ricardo M., Karl, David M.

“…The compensation irradiance, the irradiance at which net photosynthesis is zero over a 24-h period, was estimated at station ALOHA (22°45′N, 158°W) from…”
Get full text

The influence of abrupt increases in seawater pCO2 on plankton productivity in the subtropical North Pacific Ocean by Viviani, Donn A, Böttjer, Daniela, Letelier, Ricardo M, Church, Matthew J

“…We conducted a series of experiments to examine short-term (2-5 days) effects of abrupt increases in the partial pressure of carbon dioxide (pCO2) in seawater…”
Get full text

Diversity trumps acidification: Lack of evidence for carbon dioxide enhancement of Trichodesmium community nitrogen or carbon fixation at Station ALOHA by Gradoville, Mary R., White, Angelicque E., Böttjer, Daniela, Church, Matthew J., Letelier, Ricardo M.

“…We conducted 11 independent short-term carbon dioxide (CO₂) manipulation experiments using colonies of the filamentous cyanobacteria Trichodesmium isolated on…”
Get full text

Does eddy-eddy interaction control surface phytoplankton distribution and carbon export in the North Pacific Subtropical Gyre? by Guidi, Lionel, Calil, Paulo H. R., Duhamel, Solange, Björkman, Karin M., Doney, Scott C., Jackson, George A., Li, Binglin, Church, Matthew J., Tozzi, Sasha, Kolber, Zbigniew S., Richards, Kelvin J., Fong, Allison A., Letelier, Ricardo M., Gorsky, Gabriel, Stemmann, Lars, Karl, David M.

“…In the North Pacific Subtropical Gyre (NPSG), the regular occurrence of summer phytoplankton blooms contributes to marine ecosystem productivity and the annual…”
Get full text

Physiological response of Crocosphaera watsonii to enhanced and fluctuating carbon dioxide conditions by Gradoville, Mary R, White, Angelicque E, Letelier, Ricardo M

“…We investigated the effects of elevated pCO2 on cultures of the unicellular N2-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO2-enriched air,…”
Get full text

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…”
Get full text

Microbiome of Trichodesmium Colonies from the North Pacific Subtropical Gyre by Gradoville, Mary R, Crump, Byron C, Letelier, Ricardo M, Church, Matthew J, White, Angelicque E

“…Filamentous diazotrophic Cyanobacteria of the genus , often found in colonial form, provide an important source of new nitrogen to tropical and subtropical…”
Get full text

Light Driven Seasonal Patterns of Chlorophyll and Nitrate in the Lower Euphotic Zone of the North Pacific Subtropical Gyre by Letelier, Ricardo M., Karl, David M., Abbott, Mark R., Bidigare, Robert R.

“…The euphotic zone below the deep chlorophyll maximum layer (DCML) at Station ALOHA (a long-term oligotrophic habitat assessment; 22°45′N, 158°00′W) transects…”
Get full text

What factors are driving summer phytoplankton blooms in the North Pacific Subtropical Gyre? by White, Angelicque E., Spitz, Yvette H., Letelier, Ricardo M.

“…Annually recurrent summer to fall surface blooms of the dinitrogen (N2) fixing genera Trichodesmium and Richelia have a significant impact on biogeochemical…”
Get full text

Flexible Elemental Stoichiometry in Trichodesmium spp. and Its Ecological Implications by White, Angelicque E., Spitz, Yvette H., Karl, David M., Letelier, Ricardo M.

“…We conducted laboratory experiments to assess the bioelemental plasticity of cultures of Trichodesmium IMS101 under phosphorus (P)-replete, P-restricted, and…”
Get full text

A Framework for a Marine Biodiversity Observing Network Within Changing Continental Shelf Seascapes by MULLER-KARGER, FRANK E., KAVANAUGH, MARIA T., MONTES, ENRIQUE, BALCH, WILLIAM M., BREITBART, MYA, CHAVEZ, FRANCISCO P., DONEY, SCOTT C., JOHNS, ELIZABETH M., LETELIER, RICARDO M., LOMAS, MICHAEL W., SOSIK, HEIDI M., WHITE, ANGELICQUE E.

“…Continental shelves and the waters overlying them support numerous industries as diverse as tourism and recreation, energy extraction, fisheries,…”
Get full text

ALOHA From the Edge: Reconciling Three Decades of in Situ Eulerian Observations and Geographic Variability in the North Pacific Subtropical Gyre by Kavanaugh, Maria T., Church, Matthew J., Davis, Curtiss O., Karl, David M., Letelier, Ricardo M., Doney, Scott C.

“…Global analyses of satellite-and modeled data suggest decreased phytoplankton abundance and primary productivity in oligotrophic gyres as they expand in…”
Get full text

Impact of climate forcing on ecosystem processes in the North Pacific Subtropical Gyre by Corno, Guido, Karl, David M., Church, Matthew J., Letelier, Ricardo M., Lukas, Roger, Bidigare, Robert R., Abbott, Mark R.

“…Measurements at the Hawaii Ocean Time‐series (HOT) Station ALOHA (22°45′N, 158°W) have revealed a significant, approximately 50% increase in euphotic zone…”
Get full text