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DGE Newsletter, April 2006
April 7: Chris Field gave a Seminar to the Biogeochemistry Dept. at Cornell University.
April 8: Ken Caldeira talked about Carbon Sequestration: Is it feasible? during a Symposium at Yale University's Environmental Science Center.
April 11: Kim Cahill has recruited some volunteers to help her with a literature search. One of them, John Pfefferle attended Dr. Hill's Seminar and wishes to contribute what he can to climate change research.
April 13: Ken Caldeira can be heard on the Archive of KQED Radio's Forum Program with Michael Krasny about weather and climate change. Go to www.kqed.org/epArchive/R604130900.
April 21: Ken Caldeira was featured on the San Francisco Channel KTVU News at 5 PM speaking about Climate Change. You may see him in action at http://www.ktvu.com/video/8894115/index.html
April 29: Dave Kroodsma biked with his father during the last two weeks in Costa Rica while the latter collected bird songs. Dave also writes about the effect of hurricanes on the countries bordering the Caribbean which seem to be getting more intense with warming ocean waters.
April 26: Dr. Ulrike Seibt, Marie Curie International Fellow spoke about stable isotope ratios which provide independent tracers of carbon, oxygen and water fluxes in terrestrial ecosystems. Bottom-up model simulations, atmospheric inversion studies, and data interpretation rely on mechanistic
understanding of isotope fractionation at the leaf scale.  This talk gives an overview and examples of how stable isotopes contribute to process studies of the coupled carbon, oxygen and water cycles during biosphere-atmosphere exchange at a variety of scales.

April 11: Dr. Michael J. Hill, Bureau of Rural Sciences and Co-operative Research Centre for Greenhouse Accounting, Canberra, Australia spoke about a NASA funded project that looks at model-data assimilation with a wide array of remotely-sensed data sources over the Australian tropical savanna region.

Field & Berry Groups
April 27: Chris led a discussion of the history of global climate change based mainly on an 1896 paper of Arrhenius.
Tasting: Chris also brought five varieties of grapes grown in Chili—2 green and 3 red. The large red ones with small seeds were the most tasty. We discussed the ecological sustainability of food grown locally as opposed to all over our flat world.
April 20: Dr. Halton Peters spoke on Renewable Energy in China—The Potential of Biomass. This is a topic upon which Halton has spent considerable energy himself since his experiences in China last summer. He asked for and received feedback from our group about what avenues to pursue further.
April 13: Chris Field led us through the history of climate change research since about 1976 with Jule Charney's work. Hal Mooney added to the discussion with his own experiences. This has culminated to the point where now there exist academic majors in Earth Systems Science.
We also planned the Group's Meeting Schedule for the remainder of the quarter.
Tasting: Chris brought five examples of chocolate covered candies from Trader Joe's. The fillings included soy nuts, cranberries, ginger, cherries and expresso beans. The favorites were expresso and ginger with soy running a close third because they were also crunchy.
April 6: Ben Houlton, Halton Peters, Alison Appling, Sue Thayer & Jan Brown met to discuss some recent research concerning element interactions during soil carbon storage. Chris Field was on his way to Ithaca.
April 5: Dr. Curtis Deutsch, School of Oceanography, Univ. Washington spoke about Biological Impacts of Climate Change: Are the Tropics in Trouble? Curtis and his colleagues showed that the thermal sensitivities of insects, lizards, turtles, and frogs are directly related to the climate
variability these organisms experience, so that mid-latitude populations exhibit a wider temperature tolerance than do tropical populations. Their results indicate that a relatively modest warming of the tropics may have a large impact on organismal fitness, due to the high thermal sensitivity born of stable climates, whereas the larger warming predicted in high latitudes is well within the thermal tolerance of populations accustomed to strong climate variability.
Our Landscape
April 14: A Weeding Party was organized to keep ahead of the burr clover that has thrived during recent heavy rains.
This is the latest date yet to begin harvesting the growth in the experimental plots on Jasper Ridge now set to begin on May 8. The unusually late rains have created havoc with schedules. Audrey Niboyet from Univ. Paris Sud and Jessica Mentzer, a graduate student from Univ. Wisconsin both plan to analyze soil collected from the plots but may have to have samples sent to them at their respective labs.
Archives and PDF Archives of past Newsletters, Click on photos for enlargement.
Editor Jan Brown, e-mail: jbrown@globalecology.stanford.edu