Publications

Publications Found: 1373
Regional Carbon Dioxide Fluxes From Mixing Ratio Data
Bakwin, P. S., Davis, K. J., Yi, C., Wofsy, S. C., Munger, J. W., Haszpra, L., Barcza, Z.

We examine the atmospheric budget of CO2 at temperate continental sites in the Northern Hemisphere. On a monthly time scale both surface exchange and atmospheric transport are important in determining the rate of change of CO2 mixing ratio at these sites. Vertical differences between the atmospheric boundary …


Journal: Tellus Series B-Chemical and Physical Meteorology, Volume 56 (4): 301-311 (2004), ISBN . DOI: 10.3402/tellusb.v56i4.16446 Sites: CA-Man, US-Los, US-PFa, US-WCr

Photosynthesis, Carboxylation And Leaf Nitrogen Responses Of 16 Species To Elevated pCO2 Across Four Free-Air CO2 Enrichment Experiments In Forest, Grassland And Desert
Ellsworth, D. S., Reich, P. B., Naumburg, E. S., Koch, G. W., Kubiske, M. E., Smith, S. D.

The magnitude of changes in carboxylation capacity in dominant plant species under long-term elevated CO2 exposure (elevated pCa) directly impacts …


Journal: Global Change Biology, Volume 10 (12): 2121-2138 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00867.x Sites: US-Dk1, US-Dk2, US-Dk3

Estimating Photosynthetic C-13 Discrimination In Terrestrial CO2 Exchange From Canopy To Regional Scales
Lai, C., Ehleringer, J. R., Tans, P., Wofsy, S. C., Urbanski, S. P., Hollinger, D. Y.

We determined δ13C values associated with canopy gross and net CO2 fluxes from four U.S. sites sampled between 2001 and 2002. Annual mean, flux-weighted δ13C values of net ecosystem CO2exchange (NEE) were estimated for four contrasting ecosystems (three forests and one grassland) by analyzing …


Journal: Global Biogeochemical Cycles, Volume 18 (1): n/a-n/a (2004), ISBN . DOI: 10.1029/2003gb002148 Sites: US-Ho1

A Comparison Of Three Approaches To Modeling Leaf Gas Exchange In Annually Drought-Stressed Ponderosa Pine Forests
Misson, L., Panek, J. A., Goldstein, A. H.
We tested, compared and modified three models of stomatal conductance at the leaf level in a forest ecosystem where drought stress is a major factor controlling forest productivity. The models were tested against 2 years (1999 and 2000) of leaf-level measurements on ponderosa pine (Pinus ponderosaDougl. …


Journal: Tree Physiology, Volume 24 (5): 529-541 (2004), ISBN . DOI: 10.1093/treephys/24.5.529 Sites: US-Blo

Effects Of Meteorological Variations On The CO2 Exchange Of A Brazilian Transitional Tropical Forest
Vourlitis, G. L., Priante Filho, N., Hayashi, M. M., Nogueira, J. d., Raiter, F., Hoegel, W., Campelo, Jr, J. H.

The net ecosystem CO2 exchange (NEE) of a 28–30 m tall transitional (ecotonal) tropical forest of the Brazilian Amazon was quantified using tower-based eddy covariance. Measurements were made …


Journal: Ecological Applications, Volume 14 (sp4): 89-100 (2004), ISBN . DOI: 10.1890/01-6005 Sites: BR-Sa1, BR-Sa3

Wide Dynamic Range Vegetation Index For Remote Quantification Of Biophysical Characteristics Of Vegetation
Gitelson, A. A.

The Normalized Difference Vegetation Index (NDVI) is widely used for monitoring, analyzing, and mapping temporal and spatial distributions of physiological and biophysical characteristics of vegetation. It is well documented that the NDVI approaches saturation asymptotically under conditions of moderate-to-high aboveground biomass. …


Journal: Journal Of Plant Physiology, Volume 161 (2): 165-173 (2004), ISBN . DOI: 10.1078/0176-1617-01176 Sites: US-Ne1, US-Ne2, US-Ne3

Effects Of Logging On Carbon Dynamics Of A Jack Pine Forest In Saskatchewan, Canada
Howard, E. A., Gower, S. T., Foley, J. A., Kucharik, C. J.

We calculated carbon budgets for a chronosequence of harvested jack pine (Pinus banksiana Lamb.) stands (0-, 5-, 10-, and∼29-year-old) and a∼79-year-old stand …


Journal: Global Change Biology, Volume 10 (8): 1267-1284 (2004), ISBN . DOI: 10.1111/j.1529-8817.2003.00804.x Sites: CA-Ojp

The Robustness Of Eddy Correlation Fluxes For Amazon Rain Forest Conditions
Kruijt, B., Elbers, J. A., von Randow, C., Araújo, A. C., Oliveira, P. J., Culf, A., Manzi, A. O., Nobre, A. D., Kabat, P., Moors, E. J.

We analyzed errors and uncertainties in time-integrated eddy correlation data for sites in the Amazon. A well-known source of potential error in eddy correlation is through possible advective losses of CO2emissions during calm nights. There are also questions related to the treatment of low frequencies, non-horizontal …


Journal: Ecological Applications, Volume 14 (sp4): 101-113 (2004), ISBN . DOI: 10.1890/02-6004 Sites: BR-Ma2, BR-Sa1, BR-Sa3

Carbon Balance And Vegetation Dynamics In An Old-Growth Amazonian Forest
Rice, A. H., Pyle, E. H., Saleska, S. R., Hutyra, L., Palace, M., Keller, M., de Camargo, P. B., Portilho, K., Marques, D. F., Wofsy, S. C.

Amazon forests could be globally significant sinks or sources for atmospheric carbon dioxide, but carbon balance of these forests remains poorly quantified. We surveyed 19.75 ha along four 1-km transects …


Journal: Ecological Applications, Volume 14 (sp4): 55-71 (2004), ISBN . DOI: 10.1890/02-6006 Sites: BR-Sa1

The Surface CO2 Gradient And Pore-Space Storage Flux In A High-Porosity Litter Layer
Hirsch, A. I., Trumbore, S. E., Goulden, M. L.


Journal: Tellus Series B-Chemical and Physical Meteorology, Volume 56 (4): 312-321 (2004), ISBN . DOI: 10.1111/j.1600-0889.2004.00113.x Sites: CA-Man, CA-NS2, CA-NS3, CA-NS5, CA-NS6, CA-NS7