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AGU journal highlights -- January 21, 2010
Date:1/21/2010

(3.6 degrees Fahrenheit), then large floods that occurred about once every 100 years could occur up to 5 times more often.

Title: Global warming increases flood risk in mountainous areas

Authors: P. Allamano, P. Claps, and F. Laio: Dipartimento di Idraulica, Trasporti ed Infrastrutture Civili, Politecnico di Torino, Turin, Italy.

Source: Geophysical Research Letters (GRL) paper 10.1029/2009GL041395, 2009 http://dx.doi.org/10.1029/2009GL041395


4. Worldwide nitrogen deficit constrains carbon dioxide uptake by plants

Nitrogen is an essential nutrient for plants; limits on available nitrogen constrain how much plants can grow. This in turn affects the amount of carbon dioxide plants can absorb, which affects the global climate. Using a framework that considers interactions of carbon and nutrients, Wang and Houlton develop a new global estimate of nitrogen fixation rates. The authors consider the amount of nitrogen plants require to store additional carbon and found that a substantial deficit of nitrogen exists for plants in most areas of the world. They argue that most climate models that do not take into account nitrogen have overestimated carbon uptake and therefore underestimated predicted global warming. The authors suggest that it is important that the next Intergovernmental Panel on Climate Change consider interactions between the nitrogen and carbon cycles.

Title: Nitrogen constraints on terrestrial carbon uptake: Implications for the global carbon-climate feedback

Authors: Ying-Ping Wang: CSIRO Marine and Atmospheric Research and CAWCR, Aspendale, Victoria, Australia; Benjamin Z. Houlton: Department of Land, Air and Water Resources, University of California, Davis, California, USA.

Source: Geophysical Research Letters (GRL) paper 10.1029/2009GL041009, 2009 http://dx.doi.org/10.1029/2009GL041009<
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Contact: Maria-Jose Vinas
mjvinas@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

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