methane - co2.aos.wisc.educo2.aos.wisc.edu/~adesai/documents/weco-symp-12-desai.pdf ·...
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It’s more than just cow farts
Ankur R Desai Wisconsin Ecology Fall 2012 Symposium
http://purefixion.com/attention/2006/03/cow-farts.html
METHANE:
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Methane 1.8 ppm
Carbon Dioxide 393 ppm
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Global change ecology and biogeochemistry deal with the rapid rate of anthropogenic perturbation to ecosystems and its nutrient cycling
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Credit: Dave Moore
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http://media-1.web.britannica.com/eb-media/75/135075-004-105F7745.jpg
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Source: NOAA ESRL
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Source: NOAA ESRL
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http://www.iup.uni-bremen.de/sciamachy/NIR_NADIR_WFM_DOAS/wfmd_image_gallery_ch4.html
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http://amanwithaphd.wordpress.com/2010/03/04/increasing-amounts-of-natural-methane-emissions/
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http://cdn.orkin.com/images/termites/termites_813x559.jpg
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http://environment.yale.edu/content/images/00002578/Flammable-gases-coming-out-of-oak-tree-browser.jpg?1344448836
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http://www.giss.nasa.gov/research/news/20011210/methane_explosion.jpg
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http://www.treehugger.com/clean-technology/major-source-of-atmospheric-methane-identified-near-arctic-lakes.html
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http://ent.arp.harvard.edu/kinetics/sciobj/freerad/hoxcyc.html
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Source: Picarro, Inc. / Nathan Phillips, BU
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http://www.10dailythings.com/2009/12/23/u-s-to-capture-cow-farts-to-save-the-planet/
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Spahni et al. (2011) Biogeosciences
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Credit: P. Weishampel Credit: B. Rychter
Source: Cook et al (2008) AGU Poster
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Tall towers offer novel approach to estimating regional fluxes
Source: B. Cook Credit: M. Rydzik
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Long-term continuous CH4 eddy covariance is now feasible
Credit: M. Rydzik
396 m 122 m 30 m
CO2/H2O flux Picarro G1301-f CH4/CO2 (H2O)
122 m
Not shown: Los Gatos for CH4 profile/storage flux LI-7000 (NOAA) for CO2 profile/storage
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• Methane flux magnitudes do not change in magnitude from winter to growing season, but do change in quality.
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• CH4 emissions regionally are only weakly correlated to temperature, unlike at plot scale. Winter CH4 fluxes strongly correlated to small magnitude CO2 fluxes.
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Petrescu et al (in prep)
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Quiz: Who said this?
• “I am not a scientist myself, but my best assessment of the data is that the world is getting warmer, that human activity contributes to that warming, and that policymakers should therefore consider the risk of negative consequences.” – Sept. 2012
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http://www.sciencedebate.org/debate12/
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Thank you! • NSF CAREER DEB #0845166 • WLEF/ Park Falls (US-PFa) tall tower research
partners: NOAA ESRL (A. Andrews, J. Kofler), USFS NRS (M. Kubiske, D. Baumann), Penn State (K. Davis), Cal Tech (P. Wennberg), COSMOS (M. Zreda), NASA GSFC (B. Cook), WI ECB (J. Ayers) , Ameriflux
• Desai lab at UW:J Thom, K Xu, and others – http://flux.aos.wisc.edu – [email protected] – 608-218-4208