Investigating discrepancies in heat, CO2 fluxes and O3 deposition velocity over maize as measured by the eddy-covariance and the aerodynamic gradient methods

Loubet, Benjamin; Cellier, Pierre; Fléchard, Christophe; Zurfluh, Olivier; Irvine, Mark; Lamaud, Éric; Stella, Patrick; Roche, Romain; Durand, Brigitte; Flura, Dominique; Masson, Sylvie; Laville, Patricia; Garrigou, Didier; Personne, Erwan; Chelle, Michaël; Castell, Jean-François

doi:10.1016/j.agrformet.2012.09.010

Cited by 31 publications

(24 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This site, operated by INRA (Institut National de la Recherche Agronomique) and hosted by AgroParisTech, was part of the EC CarboEurope-IP, NitroEurope-IP, Eclaire-IP and INGOS-IP European projects and is part of the ICOS and Fluxnet measurement networks. The site is well documented (Laville et al, 2009;Loubet et al, 2011) as are several experiments on reactive trace gases performed at the site (Bedos et al, 2010;Loubet et al, 2012Loubet et al, , 2013Potier et al, 2015;Personne et al, 2015;Wu et al, 2016;Vuolo et al, 2017). Briefly, measurements were carried out on a 19 ha field with a fetch of 100-400 m depending on wind direction.…”

Section: Field Sitementioning

confidence: 99%

Diurnal fluxes of HONO above a crop rotation

Laufs¹,

Cazaunau²,

Stella³

et al. 2017

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract. Nitrous acid (HONO) fluxes were measured above an agricultural field site near Paris during different seasons. Above bare soil, different crops were measured using the aerodynamic gradient (AG) method. Two LOPAPs (LOng Path Absorption Photometer) were used to determine the HONO gradients between two heights. During daytime mainly positive HONO fluxes were observed, which showed strong correlation with the product of the NO 2 concentration and the long wavelength UV light intensity, expressed by the photolysis frequency J (NO 2 ). These results are consistent with HONO formation by photosensitized heterogeneous conversion of NO 2 on soil surfaces as observed in recent laboratory studies. An additional influence of the soil temperature on the HONO flux can be explained by the temperature-dependent HONO adsorption on the soil surface. A parameterization of the HONO flux at this location with NO 2 concentration, J (NO 2 ), soil temperature and humidity fits reasonably well all flux observations at this location.

show abstract

Section: Field Sitementioning

confidence: 99%

Diurnal fluxes of HONO above a crop rotation

Laufs¹,

Cazaunau²,

Stella³

et al. 2017

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…试验研究姚芳芳等, 2008;陈娟等, 2011;王云霞等, 2011;郑有飞等, 2011; Lamaud et al, 1994;Pio et al, 2000;Bassin et al, 2004;Fares et al, 2010;Stella et al, 2011Stella et al, , 2013 (mV dmax )为1.06 cm·s -1 。 (Stella et al, 2011Loubet et al, 2013); 麦田和橘园F O3 范围分别为0 --20 nmol·m -2 ·s -1 和-6 --8 nmol·m -2 ·s -1 (Tuzet et al, 2011;Fares et al, 2012); 葡萄和棉花 (Gossypium hirsutum) F O3 分别为-6 nmol·m -2 ·s -1 和 -10 nmol·m -2 ·s -1 (Grantz et al, 1995(Grantz et al, , 1997 (Goldstein et al, 2004;Vitale et al, 2005;Altimir et al, 2006;Hogg et al, 2007;Fares et al, 2012;Morani et al, 2014) …”

Section: Important Findingsunclassified

Characteristics and partitioning of ozone dry deposition measured by eddy-covariance technology in a winter wheat field

Xu¹,

Zheng²,

Mai³

et al. 2017

Chinese Journal of Plant Ecology

View full text Add to dashboard Cite

、-2.9 --11.7 nmol·m -2 ·s -1 、0.17-0.63 AbstractAims Anthropogenic pollutants cause an increase in ground-level ozone concentration, which is a known threat to plant growth and yield and has been extensively observed worldwide. Since ozone is only slightly soluble in water, it is deposited mainly through dry deposition in terrestrial ecosystem. The object of this study was to analyze the characteristics of ozone dry deposition and to estimate the contribution of stomatal and non-stomatal ozone deposition pathways to total ozone deposition in a winter wheat field.

show abstract

“…Muller et al (2009) found that the mean V d (O 3 ) by the AGM method was 1.60-3.47 times that of the EC technique at a grassland in southern Scotland. Loubet et al (2013) showed that the AGM method gave 40 % larger V d (O 3 ) than the EC technique over a mature maize field in Paris. Keronen et al (2003) found that V d (O 3 ) by the AGM and EC methods generally agreed well at a Nordic pine forest, as did Stella et al (2012) over bare soil in Paris.…”

Section: Comparison Of V D (O 3 ) By the Eddy-covariance And Gradientmentioning

confidence: 99%

“…The derivation of eddy diffusivity for air pollutants currently relies on the similarity assumption which needs more verification from field measurements. Another critical aspect when employing the flux-gradient theory is to measure the concentrations of gases at different heights with sufficient accuracy and precision (Stella et al, 2012;Loubet et al, 2013). Usually measurements at two adjacent levels above a canopy are used to derive the gradient, e.g., the aerodynamic gradient method (AGM) and the modified Bowen ratio approach (MBR).…”

Section: Introductionmentioning

confidence: 99%

A modified micrometeorological gradient method for estimating O<sub>3</sub> dry depositions over a forest canopy

Zhang

Wang

et al. 2015

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Small pollutant concentration gradients between levels above a plant canopy result in large uncertainties in estimated air-surface exchange fluxes when using existing micrometeorological gradient methods, including the aerodynamic gradient method (AGM) and the modified Bowen ratio method (MBR). A modified micrometeorological gradient method (MGM) is proposed in this study for estimating O 3 dry deposition fluxes over a forest canopy using concentration gradients between a level above and a level below the canopy top, taking advantage of relatively large gradients between these levels due to significant pollutant uptake in the top layers of the canopy. The new method is compared with the AGM and MBR methods and is also evaluated using eddy-covariance (EC) flux measurements collected at the Harvard Forest Environmental Measurement Site, Massachusetts, during 1993-2000. All three gradient methods (AGM, MBR, and MGM) produced similar diurnal cycles of O 3 dry deposition velocity (V d (O 3 )) to the EC measurements, with the MGM method being the closest in magnitude to the EC measurements. The multi-year average V d (O 3 ) differed significantly between these methods, with the AGM, MBR, and MGM method being 2.28, 1.45, and 1.18 times that of the EC, respectively. Sensitivity experiments identified several input parameters for the MGM method as first-order parameters that affect the estimated V d (O 3 ). A 10 % uncertainty in the wind speed attenuation coefficient or canopy displacement height can cause about 10 % uncertainty in the estimated V d (O 3 ). An unrealistic leaf area density vertical profile can cause an uncertainty of a factor of 2.0 in the estimated V d (O 3 ). Other input parameters or formulas for stability functions only caused an uncertainly of a few percent. The new method provides an alternative approach to monitoring/estimating long-term deposition fluxes of similar pollutants over tall canopies.

show abstract

Investigating discrepancies in heat, CO2 fluxes and O3 deposition velocity over maize as measured by the eddy-covariance and the aerodynamic gradient methods

Cited by 31 publications

References 70 publications

Diurnal fluxes of HONO above a crop rotation

Diurnal fluxes of HONO above a crop rotation

Characteristics and partitioning of ozone dry deposition measured by eddy-covariance technology in a winter wheat field

A modified micrometeorological gradient method for estimating O<sub>3</sub> dry depositions over a forest canopy

Contact Info

Product

Resources

About

Investigating discrepancies in heat, CO2 fluxes and O3 deposition velocity over maize as measured by the eddy-covariance and the aerodynamic gradient methods

Cited by 31 publications

References 70 publications

Diurnal fluxes of HONO above a crop rotation

Diurnal fluxes of HONO above a crop rotation

Characteristics and partitioning of ozone dry deposition measured by eddy-covariance technology in a winter wheat field

A modified micrometeorological gradient method for estimating O&lt;sub&gt;3&lt;/sub&gt; dry depositions over a forest canopy

Contact Info

Product

Resources

About

A modified micrometeorological gradient method for estimating O<sub>3</sub> dry depositions over a forest canopy