Long‐term observation of the atmospheric exchange of CO<sub>2</sub> with a temperate deciduous forest in southern Ontario, Canada

Lee, Xuhui; Fuentes, José D.; Staebler, R. M.; Neumann, H. H.

doi:10.1029/1999jd900227

Cited by 141 publications

(70 citation statements)

References 47 publications

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“…The uncertainty in annual totals of NEE is typically 40 g C m −2 yr −1 (Goulden et al, 1996;Lee et al, 1999;Yang et al, 1999;Lafleur et al, 2001;Baldocchi, 2003). Based on the CH 4 flux measurements on the terrace, the coefficient of variation of the measured fluxes is 92%; in Fig.…”

Section: Seasonal Course Of Carbon Dioxide and Methane Fluxesmentioning

confidence: 99%

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

et al. 2007

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Abstract. Carbon dioxide and methane fluxes were measured at a tundra site near Chokurdakh, in the lowlands of the Indigirka river in north-east Siberia. This site is one of the few stations on Russian tundra and it is different from most other tundra flux stations in its continentality. A suite of methods was applied to determine the fluxes of NEE, GPP, R eco and methane, including eddy covariance, chambers and leaf cuvettes. Net carbon dioxide fluxes were high compared with other tundra sites, with NEE=−92 g C m −2 yr −1 , which is composed of an R eco =+141 g C m −2 yr −1 and GPP=−232 g C m −2 yr −1 . This large carbon dioxide sink may be explained by the continental climate, that is reflected in low winter soil temperatures (−14 • C), reducing the respiration rates, and short, relatively warm summers, stimulating high photosynthesis rates. Interannual variability in GPP was dominated by the frequency of light limitation (R g <200 W m −2 ), whereas R eco depends most directly on soil temperature and time in the growing season, which serves as a proxy of the combined effects of active layer depth, leaf area index, soil moisture and substrate availability. The methane flux, in units of global warming potential, was +28 g C-CO 2 e m −2 yr −1 , so that the greenhouse gas balance was −64 g C-CO 2 e m −2 yr −1 . Methane fluxes depended only slightly on soil temperature and were highly sensitive to hydrological conditions and vegetation composition.

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Section: Seasonal Course Of Carbon Dioxide and Methane Fluxesmentioning

confidence: 99%

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

et al. 2007

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“…The tower supports an array of instruments for routine measurements of temperature, wind speed, humidity, and fluxes of energy, water vapour, SO 2 , and CO 2 . Details of the measurement setup can be found in Lee et al (1999), Staebler et al (2000), and Teklemariam et al (2009). Herein, we present measurements (all at a 33 m height) of water vapour with an infrared gas analyzer (model 6262, LI-COR Inc., Lincon, Nebraska), SO 2 with a pulsed fluorescence analyzer (model TECO 43C, Thermo Electron Co. Inc.), and leaf wetness with a electrical resistance plate (model 237, Campbell.…”

Section: Instrumentationmentioning

confidence: 99%

Aerosol flux measurements above a mixed forest at Borden, Ontario

et al. 2011

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Abstract. Aerosol fluxes were measured above a mixed forest by Eddy Covariance (EC) with a Fast Mobility Particle Sizer (FMPS) at the Borden Forest Research Station in Ontario, Canada between 13 July and 12 August 2009. Chemically speciated flux measurements were made at a height of 29 m at the same location between 19 July and 2 August, 2006 using a Quadrupole Aerosol Mass Spectrometer (Q-AMS). The Q-AMS measured an average sulphate deposition velocity of 0.3 mm s −1 and an average nitrate deposition velocity of 4.8 mm s −1 . The FMPS, mounted at a height of 33 m (approximately 10 m above the canopy top) and housed in a temperature controlled enclosure, measured sizeresolved particle concentrations from 3 to 410 nm diameter at a rate of 1 Hz. For the size range 18 < D < 452 nm, 60 % of fluxes were upward. The exchange velocity was between −0.5 and 2.0 mm s −1 , with median values near 0.5 mm s −1 for all sizes between 22 and 310 nm. The size distribution of the apparent production rate of particles at 33 m peaked at a diameter of 75 nm. Results indicate a decoupling of the above and below canopy spaces, whereby particles are stored in the canopy space at night, and are then diluted with cleaner air above during the day.

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“…Here, we compare these CSO E results to other proposed methods that attempt to constrain nighttime respiration. In particular, we used the so-called light response curve method [Lee et al, 1999], which is based on determining the intercept of the F t; h ð Þ and photosynthetically active photon flux density (PPFD) [Clark et al, 1999;Lai et al, 2002a;Law et al, 1999a]. The curve is expressed as:…”

Section: Ecosystem Carbon Budget At the Duke Forest Pine Sitementioning

confidence: 99%

Modeling nighttime ecosystem respiration from measured CO₂ concentration and air temperature profiles using inverse methods

et al. 2006

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[1] A major challenge for quantifying ecosystem carbon budgets from micrometeorological methods remains nighttime ecosystem respiration. An earlier study utilized a constrained source optimization (CSO) method using inverse Lagrangian dispersion theory to infer the two components of ecosystem respiration (aboveground and forest floor) from measured mean CO 2 concentration profiles within the canopy. This method required measurements of within-canopy mean velocity statistics and did not consider local thermal stratification. We propose a Eulerian version of the CSO method (CSO E ) to account for local thermal stratification within the canopy for momentum and scalars using higher-order closure principles. This method uses simultaneous mean CO 2 concentration and air temperature profiles within the canopy and velocity statistics above the canopy as inputs. The CSO E was tested at a maturing loblolly pine plantation over a 3-year period with a mild drought (2001) The modeled ecosystem respiration exceeded estimates from eddy covariance measurements (uncorrected for storage fluxes) by at least 25%, even at high friction velocities. Finally, we showed that the CSO E annual nighttime respiration values agree well with independent estimates derived from the intercept of the ecosystem light-response curve from daytime eddy covariance CO 2 flux measurements.

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Long‐term observation of the atmospheric exchange of CO₂ with a temperate deciduous forest in southern Ontario, Canada

Cited by 141 publications

References 47 publications

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

Aerosol flux measurements above a mixed forest at Borden, Ontario

Modeling nighttime ecosystem respiration from measured CO₂ concentration and air temperature profiles using inverse methods

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Long‐term observation of the atmospheric exchange of CO2 with a temperate deciduous forest in southern Ontario, Canada

Cited by 141 publications

References 47 publications

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

Aerosol flux measurements above a mixed forest at Borden, Ontario

Modeling nighttime ecosystem respiration from measured CO2 concentration and air temperature profiles using inverse methods

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Long‐term observation of the atmospheric exchange of CO₂ with a temperate deciduous forest in southern Ontario, Canada

Modeling nighttime ecosystem respiration from measured CO₂ concentration and air temperature profiles using inverse methods