Roger Kelly
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View article: <i>Chaetoceros</i> Resting Spores Do Not Significantly Bias Sedimentary Diatom‐Bound Nitrogen Isotope Records Despite Distinctly Low Values
<i>Chaetoceros</i> Resting Spores Do Not Significantly Bias Sedimentary Diatom‐Bound Nitrogen Isotope Records Despite Distinctly Low Values Open
The nitrogen isotopic composition of diatom frustule‐bound organic matter (δ 15 N DB ) is often used to study changes in high latitude biological pump efficiency across glacial‐interglacial cycles, but the proxy may be biased by species‐sp…
View article: Monospecific Diatom Cultures Suggest Potential Interspecies Variation of Diatom‐Bound Nitrogen Isotope Signatures Associated With Silica Acquisition
Monospecific Diatom Cultures Suggest Potential Interspecies Variation of Diatom‐Bound Nitrogen Isotope Signatures Associated With Silica Acquisition Open
Tracking the supply and demand of nitrate in the past ocean can help to constrain the role of biology and circulation in regulating climate. The nitrogen isotopic composition of marine phytoplankton (δ 15 N biomass ) tracks nitrate supply …
View article: Biomass burning is a source of modern black carbon to equatorial Atlantic Ocean sediments
Biomass burning is a source of modern black carbon to equatorial Atlantic Ocean sediments Open
Black carbon is a refractory form of organic carbon formed from the incomplete combustion of fossil fuels and biomass. Riverine transport is considered the dominant pathway of black carbon to the coastal oceans. However, the provenance and…
View article: Dynamic Manganese Cycling in the Northern Gulf of Mexico
Dynamic Manganese Cycling in the Northern Gulf of Mexico Open
View article: Chaetoceros resting spores record low diatom-bound nitrogen isotope values: Evidence from laboratory culture and marine sediment
Chaetoceros resting spores record low diatom-bound nitrogen isotope values: Evidence from laboratory culture and marine sediment Open
The nitrogen isotopic composition of diatom frustule-bound organic matter (δ15NDB) is often used to study changes in high latitude biological pump efficiency across glacial-interglacial cycles, but the proxy may be biased by species-specif…
View article: Glacial Southern Ocean Expansion Recorded in Foraminifera‐Bound Nitrogen Isotopes From the Agulhas Plateau During the Mid‐Pleistocene Transition
Glacial Southern Ocean Expansion Recorded in Foraminifera‐Bound Nitrogen Isotopes From the Agulhas Plateau During the Mid‐Pleistocene Transition Open
The emergence of 100‐Kyr glacial cycles (The Mid‐Pleistocene Transition [MPT]) is attributed in part to slower global overturning circulation and iron stimulation of biological carbon drawdown in the Southern Ocean. We present foraminifera…
View article: Sedimentary Accumulation of Black Carbon on the East Coast of The United States
Sedimentary Accumulation of Black Carbon on the East Coast of The United States Open
The occurrence, trends and sources of soot black carbon (BC) in coastal sediments are poorly understood, particularly during the Anthropocene. Two sediment cores, covering the last ∼100 years from the US East Coast, off North Carolina and …
View article: New Constraints on Assemblage‐Driven Variation in the Relationship Amongst Diatom‐Bound, Biomass, and Nitrate Nitrogen Isotope Values
New Constraints on Assemblage‐Driven Variation in the Relationship Amongst Diatom‐Bound, Biomass, and Nitrate Nitrogen Isotope Values Open
Tracking variations in the surface ocean supply and demand of nitrate, a key marine nutrient, can help constrain the contribution of biological production in driving past climate shifts. The nitrogen isotopic composition (as δ 15 N) of org…
View article: A Visual Tour of Carbon Export by Sinking Particles
A Visual Tour of Carbon Export by Sinking Particles Open
To better quantify the ocean's biological carbon pump, we resolved the diversity of sinking particles that transport carbon into the ocean's interior, their contribution to carbon export, and their attenuation with depth. Sinking particles…
View article: A visual tour of carbon export by sinking particles
A visual tour of carbon export by sinking particles Open
To better quantify the ocean’s biological carbon pump, we resolved the diversity of sinking particles that transport carbon into the ocean’s interior, their contribution to carbon export, and their attenuation with depth. Sinking particles…
View article: Biogenic sinking particle fluxes and sediment trap collection efficiency at Ocean Station Papa
Biogenic sinking particle fluxes and sediment trap collection efficiency at Ocean Station Papa Open
Comprehensive field observations characterizing the biological carbon pump (BCP) provide the foundation needed to constrain mechanistic models of downward particulate organic carbon (POC) flux in the ocean. Sediment traps were deployed thr…
View article: A Test of the Diatom‐Bound Paleoproxy: Tracing the Isotopic Composition of Nutrient‐Nitrogen Into Southern Ocean Particles and Sediments
A Test of the Diatom‐Bound Paleoproxy: Tracing the Isotopic Composition of Nutrient‐Nitrogen Into Southern Ocean Particles and Sediments Open
Sedimentary nitrogen isotope (as δ 15 N) records from the Southern Ocean provide critical constraints on surface nutrient consumption in the past and the role of Southern Ocean biophysical changes in setting atmospheric p CO 2 . We present…
View article: A Cool, Nutrient‐Enriched Eastern Equatorial Pacific During the Mid‐Pleistocene Transition
A Cool, Nutrient‐Enriched Eastern Equatorial Pacific During the Mid‐Pleistocene Transition Open
The emergence of high‐amplitude, low‐frequency glacial‐interglacial cycles during the mid‐Pleistocene climate transition (MPT; 800–1,200 ka) is associated with global cooling. In the eastern equatorial Pacific, sea surface temperatures coo…
View article: How well does wind speed predict air‐sea gas transfer in the sea ice zone? A synthesis of radon deficit profiles in the upper water column of the <scp>A</scp>rctic <scp>O</scp>cean
How well does wind speed predict air‐sea gas transfer in the sea ice zone? A synthesis of radon deficit profiles in the upper water column of the <span>A</span>rctic <span>O</span>cean Open
We present 34 profiles of radon‐deficit from the ice‐ocean boundary layer of the Beaufort Sea. Including these 34, there are presently 58 published radon‐deficit estimates of air‐sea gas transfer velocity ( k ) in the Arctic Ocean; 52 of t…
View article: Estimates of micro-, nano-, and picoplankton contributions to particle export in the northeast Pacific
Estimates of micro-, nano-, and picoplankton contributions to particle export in the northeast Pacific Open
The contributions of micro-, nano-, and picoplankton to particle export were estimated from measurements of size-fractionated particulate 234Th, organic carbon, and phytoplankton indicator pigments obtained during five cruises between 2010…