The mysterious missing sink

Article Abstract:

Thirty years ago geochemists were confident that the imbalance between carbon from man's activities and measured concentrations in the atmosphere could be explained by the uptake of carbon at the ocean's surface. Detailed surface carbon-flux measurements in the 1970s and 1980s and in 1990 Tans and colleagues reported that the annual flux to oceans was probably less than 0.5 x 10(super15) g of carbon a year. Nadelhoffer and colleagues now conclude that the 'missing sink' for atmospheric CO(sub2) cannot be explained by uptake in the northern temperate forests. They show that nitrogen is not stimulating forest carbon uptake in temperate forests, after tracing (super15)N through various forest compartments.

Carbon cycle (Biogeochemistry), Carbon cycle

---

Planktonic nutrient regeneration and cycling efficiency in temperate lakes

Article Abstract:

Planktonic nutrient regeneration maintains the majority of primary productivity in marine and freshwater. The efficiency of nutrient regeneration is thought to fall along a gradient of productivity, and nutrient-poor environments are assumed to be more efficient at nutrient cycling. Phosphorus regeneration was measured directly, and cycling efficiency was found not to vary with phosphorus concentration.

Observations, Plankton research, Lakes

---

Phosphate concentrations in lakes

Article Abstract:

Research is presented concerning the phosphate concentrations in 56 lakes in North America. The use of steady-state radiobioassay techniques to survey picomolar nutrient concentrations is discussed.

North America, Phosphates, Bacteria, Letter to the Editor, Lake ecology

Similar abstracts:

• Abstracts: Wetland use, settling patterns, and recruitment in mallards. Relationships of habitat patch size to predator community and survival of duck nests
• Abstracts: Structure and function of the vertebrate magnetic sense. Magnetoreception and its trigeminal mediation in the homing pigeon
• Abstracts: Triggering of volcanic eruptions. A slow earthquake sequence on the San Andreas fault. Annual modulation of triggered seismicity following the 1992 Landers earthquake in California
• Abstracts: The RCAF complex mediates chromatin assembly during DNA replication and repair. A chromatin remodelling complex involved in transcription and DNA processing
• Abstracts: HOT and the North Pacific gyre. Reduced mixing generates oscillations and chaos in the oceanic deep chlorophyll maximum

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.