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AGU journal highlights -- Jan. 28, 2008
Date:1/28/2008

h to steppes in the south, specifically focusing on wildfire history and the long-term trends in fire occurrence in larch-dominated communities. Through statistical analysis of burn scars present in tree-ring data, the authors calculate fire return intervals for zones where larch dominate and those called "larch-mixed taiga," where larch are less prevalent. They find that fires return on average every 65 years for the zone of larch dominance and every 50 years for the larch-mixed taiga zone. By comparison, in the nineteenth century fires returned on average every 101 years for the zone of larch dominance and every 97 years in the larch-mixed taiga zone. Because larch seeds require the extreme heat of fires to germinate, this decrease in fire return intervals may help sustain larch as competitor species migrate north as a result of warmer climates.

Title: Wildfires dynamic in the larch dominance zone

Authors: Viacheslav I. Kharuk and Maria L. Dvinskaya: V. N. Sukachev Institute of Forest, Krasnoyarsk, Russia;

K. Jon. Ranson: NASA Goddard Space Flight Center, Greenbelt, Maryland, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL032291, 2007; http://dx.doi.org/10.1029/2007GL032291

3. Expansion and contraction of Mars's exosphere with solar cycle

Incoming visible solar radiation heats the surface of terrestrial planets; infrared photons emitted by the surface are absorbed in the low atmosphere by greenhouse gases. By contrast, incoming ultraviolet solar radiation is absorbed by upper atmospheric particles, causing heating and expansion of the exosphere, the highest level of a planet's atmosphere. This expansion is modulated by carbon-dioxide infrared cooling to space, which occurs since the atmosphere is too thin to absorb infrared photons at these levels. Noting that comparative studies of exospheric properties can yield
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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