Gu2003 - Response of a Deciduous Forest to the Mount...

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DOI: 10.1126/science.1078366 , 2035 (2003); 299 Science et al. Lianhong Gu, Pinatubo Eruption: Enhanced Photosynthesis Response of a Deciduous Forest to the Mount www.sciencemag.org (this information is current as of December 7, 2006 ): The following resources related to this article are available online at http://www.sciencemag.org/cgi/content/full/299/5615/2035 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/299/5615/2035/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http://www.sciencemag.org/cgi/content/full/299/5615/2035#related-content http://www.sciencemag.org/cgi/content/full/299/5615/2035#otherarticles , 8 of which can be accessed for free: cites 10 articles This article 49 article(s) on the ISI Web of Science. cited by This article has been http://www.sciencemag.org/cgi/content/full/299/5615/2035#otherarticles 3 articles hosted by HighWire Press; see: cited by This article has been http://www.sciencemag.org/cgi/collection/atmos Atmospheric Science : subject collections This article appears in the following http://www.sciencemag.org/help/about/permissions.dtl in whole or in part can be found at: this article permission to reproduce of this article or about obtaining reprints Information about obtaining registered trademark of AAAS. c 2005 by the American Association for the Advancement of Science; all rights reserved. The title SCIENCE is a Copyright American Association for the Advancement of Science, 1200 New York Avenue NW, Washington, DC 20005. Science (print ISSN 0036-8075; online ISSN 1095-9203) is published weekly, except the last week in December, by the on December 7, 2006 www.sciencemag.org Downloaded from
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Response of a Deciduous Forest to the Mount Pinatubo Eruption: Enhanced Photosynthesis Lianhong Gu, 1 * Dennis D. Baldocchi, 2 Steve C. Wofsy, 3 J. William Munger, 3 Joseph J. Michalsky, 4 Shawn P. Urbanski, 3 Thomas A. Boden 1 Volcanic aerosols from the 1991 Mount Pinatubo eruption greatly increased diffuse radiation worldwide for the following 2 years. We estimated that this increase in diffuse radiation alone enhanced noontime photosynthesis of a deciduous forest by 23% in 1992 and 8% in 1993 under cloudless conditions. This finding indicates that the aerosol-induced increase in diffuse radiation by the volcano enhanced the terrestrial carbon sink and contributed to the tem- porary decline in the growth rate of atmospheric carbon dioxide after the eruption. The growth rate of atmospheric CO 2 concen- tration experienced a sharp decline in the early 1990s, an observation that was unprec- edented since CO 2 monitoring began in the late 1950s ( 1 , 2 ). This perturbation is of great interest to the global carbon cycle community because it coincided with the eruption of Mount Pinatubo (15.1°N, 121.4°E) on 15 June 1991. Studies using inversions of atmo- spheric CO 2 , O 2 /N 2 ratios, and 13 CO 2 mea- surements have indicated that an enhanced terrestrial carbon sink explains this decline ( 3 6 ). However, there is debate about the
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