For GCRG Only

Land-atmosphere carbon fluxes along a thaw-lake chronosequence on the Arctic Coastal Plain of Alaska

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

Vertical and Lateral Carbon Flux in a Larrea/Cardon Ecosystem near La Paz, BCS, Mexico

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

Air-Sea CO2 Exchange in the Coastal Marine Zone

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

Long-term Carbon Flux Measurements of Three Chaparral Stands at Sky Oaks Field Station

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

Alaska 2001 Field Report

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

Alaska 2000 Field Report

4 December 2000 2000 Summer Field Season Report Investigators: Oechel, Vourlitis, Brooks, Zamolodchikov, Karelin, Stow, Hope.

This summer field season was very intensive for our group and included research sites in Prudhoe Bay, Barrow, Atqasuk, and Seward Peninsula, Alaska, as well as a new site on the Chukotka Peninsula, Russia. Site . . . → Read More: Alaska 2000 Field Report