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
Thaw lakes and vegetated thaw lake basins (VTLBs) are common features in permafrost zones and can comprise a large proportion of the land surface [1-7] (Figure 1). Thaw lakes on the Arctic Coastal Plain (ACP) of Alaska are estimated to have begun forming approximately 10,000 years ago in the Holocene when the climate was . . . → Read More: Land-atmosphere carbon fluxes along a thaw-lake chronosequence on the Arctic Coastal Plain of Alaska
Lateral transport of carbon by wind and water in the form of litter fall could represent a significant portion of carbon entering or exiting an ecosystem. In La Paz, Baja California Sur, Mexico, GCRG established a permanent Eddy Covariance tower in 2001. Eddy Covariance tracks daily, seasonal and yearly ecosystem carbon flux, but may . . . → Read More: Vertical and Lateral Carbon Flux in a Larrea/Cardon Ecosystem near La Paz, BCS, Mexico
The 17th Annual Albert W. Johnson University Research Lecture Walter C. Oechel, Ph.D. “Global Change: Is the World Beyond Repair?”
March 21, 2007 | 3:00-4:30pm | Aztec Athletic Center Auditorium
The objective of this study is to identify and describe the patterns of and controls on air-sea CO2 exchange at distinct geographic locations (eg, Barrow AK, Bodega Bay CA, San Diego CA) and understand important characteristics of physical and biological processes of the coastal sea.
Personnel: Hiroki Ikawa, Walt Oechel Duration: 2006 – present
Recently, it was another beautiful, sunny day out on the Arctic tundra. Scientists say the Arctic is melting — and fear it could help send Earth into a global warming tailspin. It may sound nicer that way — but it’s a big problem for the Earth. Scientists say the warm weather adds to global . . . → Read More: What is a “Feedback Loop?”: Dr. Oechel on ABC News
Tidal waves, tornadoes, and the big freeze. The Day After Tomorrow is the latest disaster movie to hit the big screen. But how much of it is based on fact? We’ll talk about the realities of global warming.
Listen to a recording of the show
Dr. Walter C. Oechel is one of eight scientists selected to receive NSF Director’s 2004 Award for Distinguished Teaching Scholars.
NSF Press Release: NSF Names Eight Distinguished Teaching Scholars
Carbon flux in arid and semiarid area shrublands, especially in old-growth shrub ecosystems, has been rarely studied using eddy covariance techniques. We are taking long-term eddy covariance measurements at 3 distinct stands of chaparral at Sky Oaks Field Station. We have found that over a 100-year old-growth chamise-dominated chaparral shrub ecosystem can be a . . . → Read More: Long-term Carbon Flux Measurements of Three Chaparral Stands at Sky Oaks Field Station
General Field Conditions
Atqasuk, North Slope, Alaska
The 2001 summer season (June-September) in the Atqasuk area was colder and drier than in 2000. Average air temperature between June-September was 4.2°C. Average monthly temperatures were 4.3°C, 7.6°C, 4.3°C, and 0.7°C for June, July, August, and September respectively. Soil surface . . . → Read More: Alaska 2001 Field Report