Carbon overconsumption
Article Abstract:
A study conducted by researchers Raymond Sambrotto et al on the drawdown of dissolved inorganic carbon, nitrate and phosphate during spring phytoplankton blooms revealed that the amount of carbon removed from the water is 10-14 times higher than that of nitrate. It also exceeds the amount predicted using Redfield ratios. Sambrotto tried to attribute this to the preferential recycling of nitrogen and phosphates as decomposition took place in detrital material. However, organic caarbon and nitrogen levels measured in marine particulate matter fail to prove a systematic bias for high C:N ratios. The form taken by the anomalous production remains to be clarified.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Catalytic conversions
Article Abstract:
Three research papers have cast doubt on Y. Sugimura and Y. Suzuki's theory that high-temperature catalytic oxidation of dissolved organic carbon in ocean water produces far more carbon than previous wet-chemical oxidation methods. John H. Martin and Steve E. Fitzwater noticed no significant difference between the methods when they analysed samples of seawater. Hiroshi Ogawa, Norio Ogura and R. Benner achieved similar results. Researchers must now concentrate on whether gradients in the carbon cycle are real or merely artefacts of the method employed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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An ultimate limiting nutrient
Article Abstract:
Tyrrell has made a strong case that phosphorus, in the form of dissolved phosphate is the ultimate limiting nutrient of the ocean. Dissolved phosphate has the longest resident time of about 50,000 years, and Tyrrell built a simple model to describe relative abundances of nitrate and phosphate in the ocean, based on the ecological competition between phytoplankton that can fix N(sub2) from the air and those that cannot. However the model makes not provision for an important role for Fe.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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