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Filters: Sites: US-PFa

Publications Found: 37

Climatic And Phenological Controls On Coherent Regional Interannual Variability Of Carbon Dioxide Flux In A Heterogeneous Landscape
Desai, A.R.

The climate sensitivity of plant seasonal life cycles, or phenology, may impart significant carbon cycle feedbacks on climatic change. Analysis of interannual ecosystem carbon exchange provides one way to assess this climate sensitivity. Multiyear eddy covariance carbon dioxide flux observations from five different ecosystems (deciduous …

Journal: Journal Of Geophysical Research, Volume 115 (G00J02): n/a-n/a (2010), ISBN . DOI: 10.1029/2010JG001423 Sites: US-Los, US-PFa, US-Syv, US-WCr

Climatic Controls Of Interannual Variability In Regional Carbon Fluxes From Top-Down And Bottom-Up Perspectives
Desai, A. R., Helliker, B. R., Moorcroft, P. R., Andrews, A. E., Berry, J. A.

Observations of regional net ecosystem exchange (NEE) of CO₂ for 1997–2007 were analyzed for climatic controls on interannual variability (IAV). Quantifying IAV of regional (10⁴–10⁶ km²) NEE over long time periods is key to understanding potential feedbacks between climate and the carbon …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G2): n/a-n/a (2010), ISBN . DOI: 10.1029/2009JG001122 Sites: US-PFa

Influence Of Vegetation And Seasonal Forcing On Carbon Dioxide Fluxes Across The Upper Midwest, Usa: Implications For Regional Scaling
Desai, A. R., Noormets, A., Bolstad, P. V., Chen, J., Cook, B. D., Davis, K. J., Euskirchen, E. S., Gough, C., Martin, J. G., Ricciuto, D. M., Schmid, H. P., Tang, J., Wang, W.

Carbon dioxide fluxes were examined over the growing seasons of 2002 and 2003 from 14 different sites in Upper Midwest (USA) to assess spatial variability of ecosystem–atmosphere CO₂ exchange. These sites were exposed to similar temperature/precipitation regimes and spanned a range of vegetation types typical of the …

Journal: Agricultural And Forest Meteorology, Volume 148 (2): 288-308 (2008), ISBN . DOI: 10.1016/j.agrformet.2007.08.001 Sites: US-Los, US-PFa, US-Syv, US-WCr, US-Wi0, US-Wi1, US-Wi2, US-Wi3, US-Wi4, US-Wi6, US-Wi8

Regional Carbon Fluxes From An Observationally Constrained Dynamic Ecosystem Model: Impacts Of Disturbance, CO2 Fertilization, And Heterogeneous Land Cover
Desai, A.R., Moorcroft, P.R., Bolstad, P.V., and Davis, K.J.

The Ecosystem Demography (ED) model was parameterized with ecological, forest inventory, and historical land use observations in an intensively managed, wetland-rich forested landscape in the upper midwest United States. Model results were evaluated against a regional network of eddy covariance flux towers and analyzed about the …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 112 (G1): n/a-n/a (2007), ISBN . DOI: 10.1029/2006JG000264 Sites: US-PFa

A Multi-Site Analysis Of Random Error In Tower-Based Measurements Of Carbon And Energy Fluxes
Richardson, A. D., Hollinger, D. Y., Burba, G. G., Davis, K. J., Flanagan, L. B., Katul, G. G., William Munger, J., Ricciuto, D. M., Stoy, P. C., Suyker, A. E., Verma, S. B., Wofsy, S. C.

Measured surface-atmosphere fluxes of energy (sensible heat, H, and latent heat, LE) and CO₂ (FCO₂) represent the “true” flux plus or minus potential random and systematic measurement errors. Here, we use data from seven sites in the AmeriFlux network, including five forested sites …

Journal: Agricultural And Forest Meteorology, Volume 136 (1-2): 1-18 (2006), ISBN . DOI: 10.1016/j.agrformet.2006.01.007 Sites: CA-Let, US-Dk3, US-Ho1, US-Ne1, US-Ne2, US-Ne3, US-PFa

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

A Nonparametric Method For Separating Photosynthesis And Respiration Components In CO2 Flux Measurements
Yi, C., Li, R., Bakwin, P. S., Desai, A., Ricciuto, D. M., Burns, S. P., Turnipseed, A. A., Wofsy, S. C., Munger, J. W., Wilson, K., Monson, R. K.

Future climate change is expected to affect ecosystem-atmosphere CO₂ exchange, particularly through the influence of temperature. To date, however, few studies have shown that differences in the response of net ecosystem CO₂ exchange (NEE) to temperature among ecosystems can be explained by differences in the …

Journal: Geophysical Research Letters, Volume 31 (17): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gl020490 Sites: US-Ha2, US-Los, US-NR1, US-PFa, US-WBW, US-WCr

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), ISBN . DOI: 10.1029/2003jd004164 Sites: US-Los, US-PFa, US-WCr

Carbon Exchange And Venting Anomalies In An Upland Deciduous Forest In Northern Wisconsin, USA
Cook, B. D., Davis, K. J., Wang, W., Desai, A., Berger, B. W., Teclaw, R. M., Martin, J. G., Bolstad, P. V., Bakwin, P. S., Yi, C., Heilman, W.

Turbulent fluxes of carbon, water vapor, and temperature were continuously measured above an upland forest in north central Wisconsin during 1999 and 2000 using the eddy covariance method. Maple (Acer saccharum), basswood (Tilia americana), and green ash (Fraxinus pennsylvanica) species found in this forest …

Journal: Agricultural And Forest Meteorology, Volume 126 (3-4): 271-295 (2004), ISBN . DOI: 10.1016/j.agrformet.2004.06.008 Sites: US-Los, US-PFa, US-WCr

Transport Of Carbon Dioxide In The Presence Of Storm Systems Over A Northern Wisconsin Forest
Hurwitz, M. D., Ricciuto, D. M., Bakwin, P. S., Davis, K. J., Wang, W., Yi, C., Butler, M. P.

Mixing ratios of CO₂ often change abruptly in the presence of inclement weather and low pressure systems. Water vapor mixing ratio, temperature, wind speed, and wind direction data are used to infer that the abrupt changes in CO₂ mixing ratios at a site in northern Wisconsin are due to tropospheric mixing, horizontal …

Journal: Journal Of The Atmospheric Sciences, Volume 61 (5): 607-618 (2004), ISBN . DOI: 10.1175/1520-0469(2004)061<0607:TOCDIT>2.0.CO;2 Sites: US-PFa

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