Twenty years ago, measurements on ice cores showed that the concentration of carbon
dioxide in the atmosphere was lower during ice ages than it is today. As yet, there is no …

Nitrogen isotopes are an important tool for evaluating past biogeochemical cycling from the
paleoceanographic record. However, bulk sedimentary nitrogen isotope ratios, which can be …

In the modern climate, the ocean below 2 km is mainly filled by waters sinking into the abyss
around Antarctica and in the North Atlantic. Paleoproxies indicate that waters of North …

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

An Introduction to Organic Geochemistry explores the fate of organic matter of all types,
biogenic and man-made, in the Earth System. investigates the variety of pathways and …

Uncovers the Key Role Microbes Play in the Transformation of Oxidizable and Reducible
MineralsMany areas of geomicrobial processes are receiving serious attention from …

New data force us to raise previous estimates of oceanic denitrification. Our revised estimate
of~ 450 Tg N yr-1 (Tg= 10 12 g) produces an oceanic fixed N budget with a large deficit …

Residual macronutrients in the surface Southern Ocean result from restricted biological
utilization, caused by low wintertime irradiance, cold temperatures, and insufficient …

We report the first measurements of coupled nitrogen (N) and oxygen (O) isotopic variations
of nitrate (NO) during its assimilation by laboratory cultures of marine phytoplankton and …

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 …