Nitrogen (N) is used in many of life's fundamental biomolecules, and it is also a participant in
environmental redox chemistry. Biogeochemical processes control the amount and form of N …

Nitrogen isotope compositions in sedimentary rocks (d 15 N sed) are routinely used for
reconstructing Cenozoic N-biogeochemical cycling and are also being increasingly applied …

John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed
that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age …

Dissolved oxygen (O2) is essential for most ocean ecosystems, fuelling organisms'
respiration and facilitating the cycling of carbon and nutrients. Oxygen measurements have …

We report a new synthesis of best estimates of the inputs of fixed nitrogen to the world ocean
via atmospheric deposition and compare this to fluvial inputs and dinitrogen fixation. We …

Nitrogen is an essential nutrient for all organisms that must have been available since the
origin of life. Abiotic processes including hydrothermal reduction, photochemical reactions …

The cyclic growth and decay of continental ice sheets can be reconstructed from the history
of global sea level. Sea level is relatively well constrained for the Last Glacial Maximum …

Salinity-driven density stratification of the upper Arctic Ocean isolates sea-ice cover and
cold, nutrient-poor surface waters from underlying warmer, nutrient-rich waters. Recently …

Abstract The Yangtze Sea of the South China Craton experienced strong environmental
perturbations during the first~ 5-6 Myr of the Silurian. The Lower Silurian Lungmachi …

Nitrogen isotope ratios (δ 15 N) are a well-established tool for investigating the dietary and
trophic behavior of animals in terrestrial and marine food webs. To date, δ 15 N values in …