Similar rates of modern and last-glacial ocean thermohaline circulation inferred from radiochemical data

Article Abstract:

The Atlantic 231Pa/230Th ratio indicates that the transport of North Atlantic deep/intermediate water into the circumpolar deep water (CPDW) of the southern ocean occurred at a more intense rate during the last glacial maximum. A low 231Pa concentration in the glacial Atlantic sediments reveals the continuous export of Northern Component Water from the Atlantic Ocean. Holocene sediments exhibit high 231Pa/230Th ratios at the Polar Frontal Zone in the Atlantic and western Indian sectors, indicating that 231Pa exported from the Atlantic is quenched as it reaches the CPDW.

Natural history, Abyssal zone, Radioactivity, Atlantic Ocean, Radioactive decay

---

Risk of sea-change in the Atlantic

Article Abstract:

Researchers have undertaken a detailed study which indicates that the rate at which greenhouse gases are pumped into the atmosphere has an impact on ocean circulation stability. Higher concentrations of greenhouses gases can be released into the atmosphere without impact on ocean circulation only if the rate of increase is very slow. It is possible that the thermohaline circulation in the North Atlantic will be disrupted if atmospheric pollution continues at the current rate.

Ocean-atmosphere interaction, Greenhouse gases

---

Bifurcations of the Atlantic thermohaline circulation in response to changes in the hydrological cycle

Article Abstract:

The circulation transitions in the North Atlantic ocean reveals that addition of 0.06 sverdrup of freshwater in the catchment areas reduces the deep water circulation. The combination of an integrated global ocean circulation model and an atmospheric model is effective in calculating the required freshwater input. Small freshwater changes causes depletion in the regional convection. Vigorous changes in the regional surface temperature follow.

Observations, Hydrologic cycle, Water cycle

Similar abstracts:

• Abstracts: State of readiness. Large-scale tectonic deformation inferred from small earthquakes. Subsidence and flooding in New Orleans
• Abstracts: Conditional signalling strategies: effects of ontogeny, social experience and social status on the pheromonal signal of male cockroaches
• Abstracts: Short magma chamber residence time at an Icelandic volcano inferred from U-series disequilibria. Discovery of a magma chamber and faults beneath a Mid-Atlantic Ridge hydrothermal field
• Abstracts: Glacial cycles and orbital inclination. Cycles in fossil diversity. Interhemispheric climate links revealed by a late-glacial cooling episode in southern Chile
• Abstracts: Scales and stock markets. Scaling behaviour of heartbeat intervals obtained by wavelet-based time-series analysis

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