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Publications Found: 1437

Potential Of MODIS Ocean Bands For Estimating CO2flux From Terrestrial Vegetation: A Novel Approach
Rahman, A. F., Cordova, V. D., Gamon, J. A., Schmid, H. P., Sims, D. A.

A physiologically-driven spectral index using two ocean-color bands of MODIS satellite sensor showed great potential to track seasonally changing photosynthetic light use efficiency (LUE) and stress-induced reduction in net primary productivity (NPP) of terrestrial vegetation. Based on these findings, we developed a simple “continuous …

Journal: Geophysical Research Letters, Volume 31 (10): n/a-n/a (2004). DOI: 10.1029/2004gl019778 Sites: US-MMS

Climatic Versus Biotic Constraints On Carbon And Water Fluxes In Seasonally Drought-Affected Ponderosa Pine Ecosystems
Schwarz, P. A., Law, B. E., Williams, M., Irvine, J., Kurpius, M., Moore, D.

We investigated the relative importance of climatic versus biotic controls on gross primary production (GPP) and water vapor fluxes in seasonally drought-affected ponderosa pine forests. The study was conducted in young (YS), mature (MS), and old stands (OS) over 4 years at the AmeriFlux Metolius sites. Model simulations showed that …

Journal: Global Biogeochemical Cycles, Volume 18 (GB4007): n/a-n/a (2004). DOI: 10.1029/2004GB002234 Sites: US-Me2, US-Me4, US-Me5

Observed Covariance Between Ecosystem Carbon Exchange And Atmospheric Boundary Layer Dynamics At A Site In Northern Wisconsin
Yi, C., Davis, K. J., Bakwin, P. S., Denning, A. S., Zhang, N., Desai, A., Lin, J. C., Gerbig, C.

Ecosystem CO₂ exchange and atmosphere boundary layer (ABL) mixing are correlated diurnally and seasonally as they are both driven by solar insulation. Tracer transport models predict that these covariance signals produce a meridional gradient of annual mean CO₂ concentration in the marine boundary layer that …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 109 (D8): n/a-n/a (2004). DOI: 10.1029/2003jd004164 Sites: US-Los, US-PFa, US-WCr

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). DOI: 10.3402/tellusb.v56i4.16446 Sites: CA-Man, US-Los, US-PFa, US-WCr

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). DOI: 10.1890/01-6005 Sites: BR-Sa1, BR-Sa3

Observing Subcanopy CO2 Advection
Staebler, R. M., Fitzjarrald, D. R.

Underestimation of nocturnal CO₂ respiration under calm conditions remains an unsolved problem at many forest flux stations. In this paper, the hypothesis is tested that horizontal mean transport, not previously measured, may account for the missing CO₂. A systematic methodology was developed that comprises …

Journal: Agricultural And Forest Meteorology, Volume 122 (3-4): 139-156 (2004). DOI: 10.1016/j.agrformet.2003.09.011 Sites: US-Ha1

Nitrogen Deposition And Increased Carbon Accumulation In Ombrotrophic Peatlands In Eastern Canada
Turunen, J., Roulet, N. T., Moore, T. R., Richard, P. J.

Recent and long-term accumulation rates of carbon (C), using ²¹⁰Pb- and ¹⁴C-dating, were examined in 23 ombrotrophic peatlands in eastern Canada, where average 1990–1996 atmospheric wet nitrogen (N) deposition ranged from 0.3 to 0.8 g N m⁻² yr⁻¹. The average recent rate of C accumulation …

Journal: Global Biogeochemical Cycles, Volume 18 (3): n/a-n/a (2004). DOI: 10.1029/2003gb002154 Sites: CA-Mer

Monitoring Forest Carbon Sequestration With Remote Sensing And Carbon Cycle Modeling
Turner, D. P., Guzy, M., Lefsky, M. A., Ritts, W. D., Van Tuyl, S., Law, B. E.

Sources and sinks of carbon associated with forests depend strongly on the management regime and spatial patterns in potential productivity. Satellite remote sensing can provide spatially explicit information on land cover, stand-age class, and harvesting. Carbon-cycle process models coupled to regional climate databases can provide …

Journal: Environmental Management, Volume 33 (4): 457-466 (2004). DOI: 10.1007/s00267-003-9103-8 Sites: US-Me2

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). DOI: 10.1078/0176-1617-01176 Sites: US-Ne1, US-Ne2, US-Ne3

Satellite Monitoring Of Vegetation Dynamics: Sensitivity Enhancement By The Wide Dynamic Range Vegetation Index
Viña, A., Genebry, G.M., Gitelson, A. A.

Synoptic monitoring of vegetation dynamics relies on satellite observations of the distinctive spectral contrast between red and near infrared reflectance that photosynthetically active green vegetation exhibits. It has long been recognized that the Normalized Difference Vegetation Index (NDVI) suffers a rapid decrease of sensitivity …

Journal: Geophysical Research Letters, Volume 31 (4): 1-4 (2004). DOI: 10.1029/2003gl019034 Sites: US-Ne1, US-Ne2, US-Ne3

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