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  • 1
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    Drought sensitivity of the Amazon rainforest (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-03-07
    Description: Amazon forests are a key but poorly understood component of the global carbon cycle. If, as anticipated, they dry this century, they might accelerate climate change through carbon losses and changed surface energy balances. We used records from multiple long-term monitoring plots across Amazonia to assess forest responses to the intense 2005 drought, a possible analog of future events. Affected forest lost biomass, reversing a large long-term carbon sink, with the greatest impacts observed where the dry season was unusually intense. Relative to pre-2005 conditions, forest subjected to a 100-millimeter increase in water deficit lost 5.3 megagrams of aboveground biomass of carbon per hectare. The drought had a total biomass carbon impact of 1.2 to 1.6 petagrams (1.2 x 10(15) to 1.6 x 10(15) grams). Amazon forests therefore appear vulnerable to increasing moisture stress, with the potential for large carbon losses to exert feedback on climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Phillips, Oliver L -- Aragao, Luiz E O C -- Lewis, Simon L -- Fisher, Joshua B -- Lloyd, Jon -- Lopez-Gonzalez, Gabriela -- Malhi, Yadvinder -- Monteagudo, Abel -- Peacock, Julie -- Quesada, Carlos A -- van der Heijden, Geertje -- Almeida, Samuel -- Amaral, Ieda -- Arroyo, Luzmila -- Aymard, Gerardo -- Baker, Tim R -- Banki, Olaf -- Blanc, Lilian -- Bonal, Damien -- Brando, Paulo -- Chave, Jerome -- de Oliveira, Atila Cristina Alves -- Cardozo, Nallaret Davila -- Czimczik, Claudia I -- Feldpausch, Ted R -- Freitas, Maria Aparecida -- Gloor, Emanuel -- Higuchi, Niro -- Jimenez, Eliana -- Lloyd, Gareth -- Meir, Patrick -- Mendoza, Casimiro -- Morel, Alexandra -- Neill, David A -- Nepstad, Daniel -- Patino, Sandra -- Penuela, Maria Cristina -- Prieto, Adriana -- Ramirez, Fredy -- Schwarz, Michael -- Silva, Javier -- Silveira, Marcos -- Thomas, Anne Sota -- Steege, Hans Ter -- Stropp, Juliana -- Vasquez, Rodolfo -- Zelazowski, Przemyslaw -- Alvarez Davila, Esteban -- Andelman, Sandy -- Andrade, Ana -- Chao, Kuo-Jung -- Erwin, Terry -- Di Fiore, Anthony -- Honorio C, Euridice -- Keeling, Helen -- Killeen, Tim J -- Laurance, William F -- Pena Cruz, Antonio -- Pitman, Nigel C A -- Nunez Vargas, Percy -- Ramirez-Angulo, Hirma -- Rudas, Agustin -- Salamao, Rafael -- Silva, Natalino -- Terborgh, John -- Torres-Lezama, Armando -- New York, N.Y. -- Science. 2009 Mar 6;323(5919):1344-7. doi: 10.1126/science.1164033.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ecology and Global Change, School of Geography, University of Leeds, Leeds LS2 9JT, UK. o.phillips@leeds.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19265020" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Biomass ; Brazil ; Carbon ; Carbon Dioxide ; Climate ; *Droughts ; *Ecosystem ; South America ; *Trees/growth & development ; Tropical Climate
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Global iron connections between desert dust, ocean biogeochemistry, and climate (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-02
    Description: The environmental conditions of Earth, including the climate, are determined by physical, chemical, biological, and human interactions that transform and transport materials and energy. This is the "Earth system": a highly complex entity characterized by multiple nonlinear responses and thresholds, with linkages between disparate components. One important part of this system is the iron cycle, in which iron-containing soil dust is transported from land through the atmosphere to the oceans, affecting ocean biogeochemistry and hence having feedback effects on climate and dust production. Here we review the key components of this cycle, identifying critical uncertainties and priorities for future research.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jickells, T D -- An, Z S -- Andersen, K K -- Baker, A R -- Bergametti, G -- Brooks, N -- Cao, J J -- Boyd, P W -- Duce, R A -- Hunter, K A -- Kawahata, H -- Kubilay, N -- laRoche, J -- Liss, P S -- Mahowald, N -- Prospero, J M -- Ridgwell, A J -- Tegen, I -- Torres, R -- New York, N.Y. -- Science. 2005 Apr 1;308(5718):67-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Environmental Sciences, University of East Anglia, Norwich NR47TJ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15802595" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Dioxide ; *Climate ; Desert Climate ; *Dust ; *Iron/metabolism ; Oceans and Seas ; Phytoplankton/physiology ; *Seawater ; Soil
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Cassini Imaging Science: initial results on Saturn's atmosphere (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-26
    Description: The Cassini Imaging Science Subsystem (ISS) began observing Saturn in early February 2004. From analysis of cloud motions through early October 2004, we report vertical wind shear in Saturn's equatorial jet and a maximum wind speed of approximately 375 meters per second, a value that differs from both Hubble Space Telescope and Voyager values. We also report a particularly active narrow southern mid-latitude region in which dark ovals are observed both to merge with each other and to arise from the eruptions of large, bright storms. Bright storm eruptions are correlated with Saturn's electrostatic discharges, which are thought to originate from lightning.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Porco, C C -- Baker, E -- Barbara, J -- Beurle, K -- Brahic, A -- Burns, J A -- Charnoz, S -- Cooper, N -- Dawson, D D -- Del Genio, A D -- Denk, T -- Dones, L -- Dyudina, U -- Evans, M W -- Giese, B -- Grazier, K -- Helfenstein, P -- Ingersoll, A P -- Jacobson, R A -- Johnson, T V -- McEwen, A -- Murray, C D -- Neukum, G -- Owen, W M -- Perry, J -- Roatsch, T -- Spitale, J -- Squyres, S -- Thomas, P -- Tiscareno, M -- Turtle, E -- Vasavada, A R -- Veverka, J -- Wagner, R -- West, R -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1243-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cassini Imaging Central Laboratory for Operations, Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA. carolyn@ciclops.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15731441" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Extraterrestrial Environment ; *Saturn ; Spacecraft ; Wind
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Science and government. An Earth systems science agency (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-07-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaefer, Mark -- Baker, D James -- Gibbons, John H -- Groat, Charles G -- Kennedy, Donald -- Kennel, Charles F -- Rejeski, David -- New York, N.Y. -- Science. 2008 Jul 4;321(5885):44-5. doi: 10.1126/science.1160192.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18599760" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere ; Biodiversity ; Conservation of Natural Resources ; Ecology ; Fresh Water ; Geological Phenomena ; Geology ; Oceanography ; Oceans and Seas ; *Public Policy ; United States ; United States Government Agencies/*organization & administration
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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