Estimates of the Annual Net Carbon and Water Exchange of Forests: The EUROFLUX Methodology

Aubinet, Marc; Grelle, Achim; Ibrom, Andreas; Rannik, Üllar; Moncrieff, John; Foken, Thomas; Kowalski, Andrew S.; Martin, Philippe; Berbigier, Paul; Bernhofer, Christian; Clement, Robert; Elbers, J.A.; Granier, André; Grünwald, Thomas; Morgenstern, K.; Pilegaard, Kim; Rebmann, Corinna; Snijders, W.; Валентини, Р.; Vesala, Timo

doi:10.1016/s0065-2504(08)60018-5

Cited by 1,744 publications

(1,587 citation statements)

References 60 publications

Supporting

Mentioning

1,533

Contrasting

Unclassified

Order By: Relevance

“…Post-processing of the raw high-frequency (10 Hz) data for calculation of half-hour periods of the turbulent fluxes and CO 2 (F c ; g CO 2 m −2 time −1 ) involved standard spike filtering, planar rotation of velocities, and lag correction to CO 2 and q (Aubinet et al, 1999;Wilczak et al, 2001). Frequency response correction of some of the energy lost due to instrument separation, tube attenuation, and gas analyser response for LE and F c was performed with empirical cospectral adjustment to match the H co-spectrum (Eugster and Senn, 1995;Su et al, 2004).…”

Section: Data Pre-processingmentioning

confidence: 99%

“…the first quartile are night-time data constituting 81 % of the whole first quartile data set, and the last quartile had the highest number of daytime values at 79.29 % of the fourth quartile data set. Lee and Hu (2002) hypothesized that the lack of energy balance closure during nocturnal periods was often the result of mean vertical advection, whereas Aubinet et al (1999) and Blanken et al (1997) showed that energy imbalance during nocturnal periods is usually greatest when friction velocity is small. Another source of error in the nocturnal EBR is the high uncertainty in night-time measurements of Rn.…”

Section: Day-night-time Effectsmentioning

confidence: 99%

“…They provide a distinct contribution to the study of environmental, biological and climatological controls of the net surface exchanges between the land surface (including vegetation) and the atmosphere (Aubinet, et al, 1999;Baldocchi et al, 2001). The accuracy of these data is very important because they are used to validate and assess performance of land surface and climate models.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Majozi

Mannaerts

Ramoelo

et al. 2017

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Flux towers provide essential terrestrial climate, water, and radiation budget information needed for environmental monitoring and evaluation of climate change impacts on ecosystems and society in general. They are also intended for calibration and validation of satellite-based Earth observation and monitoring efforts, such as assessment of evapotranspiration from land and vegetation surfaces using surface energy balance approaches.In this paper, 15 years of Skukuza eddy covariance data, i.e. from 2000 to 2014, were analysed for surface energy balance closure (EBC) and partitioning. The surface energy balance closure was evaluated using the ordinary least squares regression (OLS) of turbulent energy fluxes (sensible (H) and latent heat (LE)) against available energy (net radiation (Rn) less soil heat (G)), and the energy balance ratio (EBR). Partitioning of the surface energy during the wet and dry seasons was also investigated, as well as how it is affected by atmospheric vapour pressure deficit (VPD), and net radiation.After filtering years with low-quality data (2004)(2005)(2006)(2007)(2008), our results show an overall mean EBR of 0.93. Seasonal variations of EBR also showed the wet season with 1.17 and spring (1.02) being closest to unity, with the dry season (0.70) having the highest imbalance. Nocturnal surface energy closure was very low at 0.26, and this was linked to low friction velocity during night-time, with results showing an increase in closure with increase in friction velocity.The energy partition analysis showed that sensible heat flux is the dominant portion of net radiation, especially between March and October, followed by latent heat flux, and lastly the soil heat flux, and during the wet season where latent heat flux dominated sensible heat flux. An increase in net radiation was characterized by an increase in both LE and H, with LE showing a higher rate of increase than H in the wet season, and the reverse happening during the dry season. An increase in VPD is correlated with a decrease in LE and increase in H during the wet season, and an increase in both fluxes during the dry season.

show abstract

Section: Data Pre-processingmentioning

confidence: 99%

Section: Day-night-time Effectsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Majozi

Mannaerts

Ramoelo

et al. 2017

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The measurements are based on the EC method (Aubinet et al 2000;Baldocchi 2003). The instrumentation core consist of a 3-m high mast equipped with an R3-50 three axis anemometer (Gill Instruments Ltd., Lymington, Hampshire, UK) combined with an open-path CO 2 /H 2 O gas analyzer LI-7500 (Li-Cor, Inc., Lincoln, NE, USA) and Tunable Diode Laser trace gas detector (TDL) (Aerodyne Res., Inc., Billerica, MA, USA) for measuring CH 4 fluxes.…”

Section: Measurementsmentioning

confidence: 99%

Monitoring the Multi-Year Carbon Balance of a Subarctic Palsa Mire with Micrometeorological Techniques

Christensen

Jackowicz-Korczyński

Aurela

et al. 2012

AMBIO

View full text Add to dashboard Cite

This article reports a dataset on 8 years of monitoring carbon fluxes in a subarctic palsa mire based on micrometeorological eddy covariance measurements. The mire is a complex with wet minerotrophic areas and elevated dry palsa as well as intermediate sub-ecosystems. The measurements document primarily the emission originating from the wet parts of the mire dominated by a rather homogenous cover of Eriophorum angustifolium. The CO 2 /CH 4 flux measurements performed during the years [2001][2002][2003][2004][2005][2006][2007][2008] showed that the areas represented in the measurements were a relatively stable sink of carbon with an average annual rate of uptake amounting to on average -46 g C m -2 y -1 including an equally stable loss through CH 4 emissions (18-22 g CH 4 -C m -2 y -1 ). This consistent carbon sink combined with substantial CH 4 emissions is most likely what is to be expected as the permafrost under palsa mires degrades in response to climate warming.

show abstract

“…The ozone flux was obtained by multiplying the deposition velocity by the absolute ozone concentration measured with slow response sensor (Environnement SA, model 41M, France). Fluxes were integrated over 30 min time spans and calculation followed the CarboEurope methodology (Aubinet et al, 2000).…”

Section: Site Characteristics and Measurementsmentioning

confidence: 99%

Predicting and partitioning ozone fluxes to maize crops from sowing to harvest: the Surfatm-O<sub>3</sub> model

et al. 2011

View full text Add to dashboard Cite

Abstract. Terrestrial ecosystems represent a major sink for ozone (O 3 ) and also a critical control of tropospheric O 3 budget. However, due to its deleterious effects, plant functioning is affected by the ozone absorbed. It is thus necessary to both predict total ozone deposition to ecosystems and partition the fluxes in stomatal and non-stomatal pathways. The Surfatm-O 3 model was developed to predict ozone deposition to agroecosystems from sowing to harvest, taking into account each deposition pathways during bare soil, growth, maturity, and senescence periods. An additional sink was added during senescence: stomatal deposition for yellow leaves, not able to photosynthesise but transpiring. The model was confronted to measurements performed over three maize crops in different regions of France. Modelled and measured fluxes agreed well for one dataset for any phenological stage, with only 4 % difference over the whole cropping season. A larger discrepancy was found for the two other sites, 15 % and 18 % over the entire study period, especially during bare soil, early growth and senescence. This was attributed to site-specific soil resistance to ozone and possible chemical reactions between ozone and volatile organic compounds emitted during late senescence. Considering both night-time and daytime conditions, non-stomatal deposition was the major ozone sink, from 100 % during bare soil period to 70-80 % on average during maturity. However, considering only daytime conditions, especially under optimal climatic conditions for plant functioning, stomatal flux could represent 75 % of total ozone flux. This model could improve estimates of crop yield losses and projections of tropospheric ozone budget.

show abstract

Estimates of the Annual Net Carbon and Water Exchange of Forests: The EUROFLUX Methodology

Cited by 1,744 publications

References 60 publications

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Monitoring the Multi-Year Carbon Balance of a Subarctic Palsa Mire with Micrometeorological Techniques

Predicting and partitioning ozone fluxes to maize crops from sowing to harvest: the Surfatm-O<sub>3</sub> model

Contact Info

Product

Resources

About

Estimates of the Annual Net Carbon and Water Exchange of Forests: The EUROFLUX Methodology

Cited by 1,744 publications

References 60 publications

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Monitoring the Multi-Year Carbon Balance of a Subarctic Palsa Mire with Micrometeorological Techniques

Predicting and partitioning ozone fluxes to maize crops from sowing to harvest: the Surfatm-O&lt;sub&gt;3&lt;/sub&gt; model

Contact Info

Product

Resources

About

Predicting and partitioning ozone fluxes to maize crops from sowing to harvest: the Surfatm-O<sub>3</sub> model