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Filters: Sites: US-Ha1

Publications Found: 60

Using Model-Data Fusion To Interpret Past Trends, And Quantify Uncertainties In Future Projections, Of Terrestrial Ecosystem Carbon Cycling
Keenan, T. F., Davidson, E., Moffat, A. M., Munger, W., Richardson, A. D.

Uncertainties in model projections of carbon cycling in terrestrial ecosystems stem from inaccurate parameterization of incorporated processes (endogenous uncertainties) and processes or drivers that are not accounted for by the model (exogenous uncertainties). Here, we assess endogenous and exogenous uncertainties using a model-data …

Journal: Global Change Biology, Volume 18 (8): 2555-2569 (2012), ISBN . DOI: 10.1111/j.1365-2486.2012.02684.x Sites: US-Ha1

Interannual, Seasonal, And Diel Variation In Soil Respiration Relative To Ecosystem Respiration At A Wetland To Upland Slope At Harvard Forest
Phillips, S. C., Varner, R. K., Frolking, S., Munger, J. W., Bubier, J. L., Wofsy, S. C., Crill, P. M.

Soil carbon dioxide efflux (soil respiration, SR) was measured with eight autochambers at two locations along a wetland to upland slope at Harvard Forest over a 4 year period, 2003–2007. SR was consistently higher in the upland plots than at the wetland margin during the late summer/early fall. Seasonal and diel hystereses with …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 115 (G2): n/a-n/a (2010), ISBN . DOI: 10.1029/2008jg000858 Sites: US-Ha1

Factors Controlling CO2 Exchange On Timescales From Hourly To Decadal At Harvard Forest
Urbanski, S., Barford, C., Wofsy, S., Kucharik, C., Pyle, E., Budney, J., McKain, K., Fitzjarrald, D., Czikowsky, M., Munger, J. W.

We analyzed 13 years (1992−2004) of CO₂ flux data, biometry, and meteorology from a mixed deciduous forest in central Massachusetts. Annual net uptake of CO₂ ranged from 1.0 to …

Journal: Journal Of Geophysical Research, Volume 112 (G2): (2007), ISBN . DOI: 10.1029/2006JG000293 Sites: US-Ha1

Atmospheric Reactive Nitrogen Concentration And Flux Budgets At A Northeastern U.S. Forest Site
Horii, C., Munger, J. W., Wofsy, S., Zahniser, M., Nelson, D., McManus, J. B.

We report concentrations of atmospheric NO_x, nitric acid (HNO₃), peroxyacetyl nitrate (PAN), and NO_y; eddy covariance fluxes of NO_x and NO_y; inferred fluxes of HNO₃ at …

Journal: Agricultural And Forest Meteorology, Volume 136 (3-4): 159-174 (2006), ISBN . DOI: 10.1016/j.agrformet.2006.03.005 Sites: US-Ha1

Woody Debris Contribution To The Carbon Budget Of Selectively Logged And Maturing Mid-Latitude Forests
Liu, W. H., Bryant, D. M., Hutyra, L. R., Saleska, S. R., Hammond-Pyle, E., Curran, D., Wofsy, S. C.

Woody debris (WD) is an important component of forest C budgets, both as a C reservoir and source of CO₂ to the atmosphere. We used an infrared gas analyzer and closed dynamic chamber to measure CO₂ efflux from downed coarse WD (CWD; diameter≥7.5 cm) and fine WD (FWD; 7.5 cm>diameter≥2 cm) to assess …

Journal: Oecologia, Volume 148 (1): 108-117 (2006), ISBN . DOI: 10.1007/s00442-006-0356-9 Sites: US-Ha1

Measuring Canopy Structure And The Kinematics Of Subcanopy Flows In Two Forests
Staebler, R. M., Fitzjarrald, D. R.

A better understanding of forest subcanopy flows is needed to evaluate their role in the horizontal movement of scalars, particularly in complex terrain. This paper describes detailed measurements of the canopy structure and its variability in both the horizontal …

Journal: Journal Of Applied Meteorology, Volume 44 (8): 1161-1179 (2005), ISBN . DOI: 10.1175/jam2265.1 Sites: US-Ha1

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), ISBN . DOI: 10.1016/j.agrformet.2003.09.011 Sites: US-Ha1

Biometric And Eddy-Covariance Based Estimates Of Annual Carbon Storage In Five Eastern North American Deciduous Forests
Curtis, P. S., Hanson, P. J., Bolstad, P., Barford, C., Randolph, J., Schmid, H., Wilson, K. B.

Quantifying net carbon (C) storage by forests is a necessary step in the validation of carbon sequestration estimates and in assessing the possible role of these ecosystems in offsetting fossil fuel emissions. In eastern North America, five sites were established in deciduous …

Journal: Agricultural And Forest Meteorology, Volume 113 (1-4): 3-19 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00099-0 Sites: US-Ha1, US-MMS, US-UMB, US-WCr

Boundary Layer Clouds And Vegetation–Atmosphere Feedbacks
Freedman, J. M., Fitzjarrald, D. R., Moore, K. E., Sakai, R. K.

An analysis of boundary layer cumulus clouds and their impact on land surface–atmosphere exchange is presented. Seasonal trends indicate that in response to increasing insolation and sensible heat flux, both the mixed-layer height (z_i) …

Journal: Journal Of Climate, Volume 14 (2): 180-197 (2001), ISBN . DOI: 10.1175/1520-0442(2001)013<0180:BLCAVA>2.0.CO;2 Sites: US-Ha1

Factors Controlling Long- And Short-Term Sequestration Of Atmospheric CO2 In A Mid-Latitude Forest
Barford, C. C., Wofsy, S. C., Goulden, M. L., Munger, J. W., Pyle, E. H., Urbanski, S. P., Hutyra, L., Saleska, S. R., Fitzjarrald, D., Moore, K.

Net uptake of carbon dioxide (CO₂) measured by eddy covariance in a 60- to 80-year-old forest averaged 2.0 ± 0.4 megagrams of carbon per hectare per year during 1993 to 2000, with interannual variations exceeding 50%. Biometry indicated storage of 1.6 ± 0.4 megagrams of carbon per hectare per year over 8 years, 60% in …

Journal: Science, Volume 294 (5547): 1688-1691 (2001), ISBN . DOI: 10.1126/science.1062962 Sites: US-Ha1

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