Nature Geoscience - Current issue : December 2008 - Vol 1 No 12
- Charcoal in Australian soils
- Earth's missing lead: The Horoman solution
- Glacial Atlantic Ocean: Southern waters moving north
- East Antarctic ice flow: Fast-track on subglacial flood
Latest content
Advance Online Publication
Return of North Atlantic deep convection
Article by Våge et al.
Deep convection in the subpolar North Atlantic, an important component of the global ocean circulation, has been absent in recent years. Profiling float data from the Argo programme document the return of deep mixing to the subpolar gyre in both the Labrador and Irmiger seas in the winter of 2007–2008.
Current Issue
Snowball Earth challenged
Review by Allen and Etienne
The Snowball Earth concept envisages a fully frozen Earth for millions of years several times during the Neoproterzoic Era between 1,000 and 542 million years ago. However, the sedimentary evidence suggests that despite the severity of glaciation, some oceans must have remained ice-free.
Current Issue
Towards resolving the lead paradox
Letter by Malaviarachchi et al.
Peridotites from the Horoman massif have the least radiogenic lead isotope ratios reported from any mantle material, and unlike any inferred from the compositions of mid-ocean-ridge basalts. These data hint at the existence of ancient mantle domains that are not sampled by mid-ocean-ridge basalts.
Current Issue
Nutrient delivery and salmon
Letter by Rex and Petticrew
Pacific salmon deliver substantial quantities of nutrients to freshwater streams when they spawn. Experiments with a recirculation flume support the idea that bacterially mediated aggregation of salmon organic matter, as well as inorganic particulate matter, is responsible for nutrient delivery to these stream beds.
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Current Issue
Urban coasts
Commentary by Törnqvist and Meffert
The 2008 Atlantic hurricane season once again highlighted the challenges awaiting low-lying population centres close to the ocean. In the face of global sea-level rise, unconventional thinking is required to make urban coasts more resilient.