A new model for Proterozoic ocean chemistry
- D. Canfield
- Environmental Science, GeologyNature
- 3 December 1998
There was a significant oxidation of the Earth's surface around 2 billion years ago (2 Gyr). Direct evidence for this oxidation comes, mostly, from geological records of the redox-sensitive elements…
THE EARLY HISTORY OF ATMOSPHERIC OXYGEN: Homage to Robert M. Garrels
- D. Canfield
- Environmental Science
- 15 May 2005
▪ Abstract This paper reviews the Precambrian history of atmospheric oxygen, beginning with a brief discussion of the possible nature and magnitude of life before the evolution of oxygenic…
Development of a sequential extraction procedure for iron: implications for iron partitioning in continentally derived particulates
- S. Poulton, D. Canfield
- Geology
- 25 January 2005
The Evolution and Future of Earth’s Nitrogen Cycle
- D. Canfield, A. Glazer, P. Falkowski
- Environmental ScienceScience
- 8 October 2010
Humans must modify their behavior or risk causing irreversible changes to life on Earth, as the damage done by humans to the nitrogen economy of the planet will persist for decades, possibly centuries, if active intervention and careful management strategies are not initiated.
Reactive iron in marine sediments.
- D. Canfield
- Environmental ScienceGeochimica et Cosmochimica Acta
- 1 March 1989
The global carbon cycle: a test of our knowledge of earth as a system.
- P. Falkowski, R. Scholes, W. Steffen
- Environmental ScienceScience
- 13 October 2000
It is concluded that although natural processes can potentially slow the rate of increase in atmospheric CO2, there is no natural "savior" waiting to assimilate all the anthropogenically produced CO2 in the coming century.
Biogeochemistry of Sulfur Isotopes
- D. Canfield
- Environmental Science
- 2001
Sulfur, with an atomic weight of 32.06, has four stable isotopes. By far the most abundant is 32S, representing around 95% of the total sulfur on Earth. The next most abundant isotope is 34S,…
Late Proterozoic rise in atmospheric oxygen concentration inferred from phylogenetic and sulphur-isotope studies
- D. Canfield, A. Teske
- Environmental ScienceNature
- 11 July 1996
The evolution of non-photosynthetic sulphide-oxidizing bacteria was contemporaneous with a large shift in the isotopic composition of biogenic sedimentary sulphides between 0.64 and 1.05 billion…
Sources of iron for pyrite formation in marine sediments
- R. Raiswell, D. Canfield
- Geology, Environmental Science
- 1 March 1998
More than two hundred aerobic continental margin, aerobic deep sea, dysaerobic, and anaerobic / euxinic sediments have been examined for their variations in different operationally defined iron…
Ferruginous Conditions: A Dominant Feature of the Ocean through Earth's History
- S. Poulton, D. Canfield
- Environmental Science, Geography
- 1 April 2011
The reconstruction of oceanic paleoredox conditions on Earth is essential for investigating links between biospheric oxygenation and major periods of biological innovation and extinction, and for…
...
...