Background Knowledge of biological and climatic controls in terrestrial nitrogen (N) cycling
within and across ecosystems is central to understanding global patterns of key ecosystem …

The marine nitrogen cycle is a complex web of microbially mediated reactions that control
the inventory, distribution, and speciation of nitrogen in the marine environment. Because …

We report a new method for measurement of the isotopic composition of nitrate (NO3-) at the
natural-abundance level in both seawater and freshwater. The method is based on the …

Ocean Biogeochemical Dynamics provides a broad theoretical framework upon which
graduate students and upper-level undergraduates can formulate an understanding of the …

We report a novel method for measurement of the oxygen isotopic composition (18O/16O) of
nitrate (NO3-) from both seawater and freshwater. The denitrifier method, based on the …

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 …

Nitrogen (N) has two stable isotopes, 14N and 15N (atomic masses of 14 and 15,
respectively). 14N is the more abundant of the two, comprising 99.63 Æ 0.02% of the N …

Ecosystem processes are important determinants of the biogeochemistry of the ocean, and
they can be profoundly affected by changes in climate. Ocean models currently express …

The surface water of the marine environment has traditionally been viewed as a nitrogen (N)
limited habitat, and this has guided the development of conceptual biogeochemical models …

A nitrogen stable isotopic model was constructed in order to constrain the Holocene marine‐
fixed nitrogen budget. The primary sources and sinks considered were riverine and …