Nature Geoscience - Current issue : November 2009 - Vol 2 No 11
- Partial melt beneath the Washington Cascades
- Tropical ocean: Cooling the surface
- Lowermost mantle: Weak post-perovskite
- Mountain ridge migration: Drainage basins split
Latest content
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Missing shocks
Letter by Peng and Zhao
A significant number of the early aftershocks following large shallow earthquakes are missing in existing earthquake catalogues. An analysis of the waveforms of 3,647 relocated earthquakes along the Parkfield section of the San Andreas fault reveals 11 times more aftershocks within 3 days of the 2004 Parkfield earthquake than listed in a standard catalogue.
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European balance
Progress Article by Schulze et al.
Carbon dioxide uptake by the terrestrial biosphere has the potential to mitigate fossil fuel emissions. Comprehensive estimates of Europe's greenhouse-gas balance suggest that any uptake of carbon dioxide by the terrestrial biosphere is offset by methane and nitrous oxide emissions.
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Antarctic ice
Letter by Chen et al.
Accurate quantification of Antarctic ice-sheet mass balance and its contribution to global sea-level rise remains challenging. Gravity Recovery and Climate Experiment data spanning the period April 2002 to January 2009 confirm earlier estimates of ice loss for Antarctica and indicate that East Antarctica started losing mass in about 2006.
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Dating zircon
Letter by Siebel et al.
Zircon is a common mineral in continental crustal rocks, and is often used in the reconstruction of geological processes. Analyses of the isotopic and trace element compositions of large zircons of gem quality from the Bohemian Massif reveal that zircons can remain intact in the upper mantle under specific chemical conditions for about 20–60 million years.
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Sources and sinks
Progress Article by Le Quéré et al.
Efforts to control climate change require the stabilization of atmospheric carbon dioxide concentrations. An assessment of the trends in sources and sinks of atmospheric carbon dioxide suggests that the sinks are not keeping up with the increase in carbon dioxide emissions, but uncertainties are still large.
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