The effects of elevated CO2, climate variability, and fire on the functioning of the chaparral of Southern California
Presented at MEDECOS XII Conference, July 6-9, 2011, Los Angeles, CA.
Oechel, Walter1,2, Alessandra Rossi1, Patrick Murphy1, John Kim3, Tom Bell1, Hongyan Luo4, David Lipson5
1Global Change Research Group, San Diego State University, San Diego, CA . . . → Read More: The effects of elevated CO2, climate variability, and fire on the functioning of the chaparral of Southern California
Authors: Ikawa, H.; Oechel, WC Source: CONTINENTAL SHELF RESEARCH Volume: 31 Issue: 13 Pages: 1357-1364 DOI: 10.1016/j.csr.2011.05.012 Published: SEP 1 2011
Abstract: Partial pressure of CO2 in equilibrium with sample water (pCO2) for the coastal water in the Chukchi Sea was continuously observed in summer, 2008. Average daily CO2 flux calculated from the pCO2 and gas transfer coefficients ranged from -0.144 to -0.0701 g C . . . → Read More: Air-sea CO2 exchange of beach and near-coastal waters of the Chukchi Sea near Barrow, Alaska
“Although many scientists agree that the current warming trend is likely to continue, it is unknown whether a warmer climate will turn the Arctic Coastal Plain from a sink to a source of greenhouse gases…. Cove Sturtevant and Dr. Walt Oechel from San Diego State University in California are addressing some of these questions . . . → Read More: GCRG on LI-COR NewsLine: Measure Methane Where it Matters: Part II, Barrow, Alaska
Indonesia has the largest tropical peats, ranging from 18 to 27 million hectares. It is estimated that about 12 million hectares of these peats have been disturbed and substantially drained in order to lower water table depths which are required for agricultural uses (i.e. rice paddy, industrial pulp, and recently oil palm plantation). Drained . . . → Read More: Impacts of Conversion and Drainage of Tropical Peat Forests on Carbon Fluxes to Atmosphere and Water
The Arctic landscape holds massive potential to affect the global carbon balance. Soils of the northern permafrost region account for approximately 50 percent of the estimated global below-ground organic carbon pool. The total soil organic carbon in the first 3 m in northern circumpolar permafrost, excluding yedoma, is ca.1024 PgC. Under a projected warmer . . . → Read More: Seasonal and Inter-Annual Controls on CO2 Flux in Arctic Alaska
GCRG was awarded a grant by the US Department of Energy for the proposal, “Seasonal and Inter-Annual Controls on CO2 Flux in Arctic Alaska” (PI: Walt Oechel). The grant will allow GCRG to operate eddy covariance flux towers at Barrow, Atqasuk and Ivotuk for the next 3 years.
Read more about the project here.
Our 2010 summer research activities near Barrow were very successful. From July 1 to August 12, 2010 Ph.D. candidate Cove Sturtevant and assistant Tim Hubbard placed portable eddy covariance towers at 21 lake or vegetated drained lake features over a 150 square mile area near Barrow, Alaska. A total of three portable towers were . . . → Read More: Summer 2010 Field Report: Barrow, Alaska
During the summer of 2010 Master’s degree candidate Tom Bell completed his field research in the CIBNOR desert preserve near La Paz, BCS, Mexico. From June to August, Tom monitored lateral litter flux experiments, which had commenced in the summer of 2009. Collection of vertical and lateral litter traps was completed over two time . . . → Read More: Summer 2010 Field Report: La Paz, Mexico
GCRG will work with the National Aeronautics and Space Administration’s Jet Propulsion Lab to measure the greenhouse gas effect on the Arctic. The research team will collect data that will provide unprecedented experimental insights into Arctic carbon cycling, especially the release of the important greenhouse gases such as carbon dioxide and methane. The study . . . → Read More: GCRG Heads for the Skies with NASA-Funded Research
Anthropogenic activities have disrupted biogeochemical cycles with subsequent increases in the emission of radiatively important trace gases. Wetlands are natural sources of CO2, CH4 and N2O with seasonal variations in anthropogenic inputs, temperature, salinity, and water modulating emissions. Variations in trace gas flux in mangrove ecosystems using eddy covariance, soil coring, leaf litter sampling, . . . → Read More: Seasonal Variations of Trace Gas Flux in Mangrove Ecosystem in Baja California Sur, Mexico