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See detailDiriger un établissement d'accueil de la petite enfance : une question centrale pour le développement d'une qualité des services
Pirard, Florence ULg

Conference given outside the academic context (2015)

Le rôle central des responsables des services d’éducation et d’accueil des jeunes enfants (EAJE) pour le développement d’une qualité de services est souligné dans de nombreux rapports internationaux ... [more ▼]

Le rôle central des responsables des services d’éducation et d’accueil des jeunes enfants (EAJE) pour le développement d’une qualité de services est souligné dans de nombreux rapports internationaux. Citons notamment les travaux de l’OCDE (à paraître), plus particulièrement la partie consacrée au « quality workforce » et à son monitoring. Pourtant, selon les contextes, les contours de ce rôle ne sont pas toujours clairement établis ; ils peuvent être source de confusion et d’ambiguïté. La difficulté de gérer les services en conciliant des fonctions sociales, éducatives et économiques est clairement posée. La difficulté également de gérer une équipe dont les membres ont des statuts parfois précaires, des niveaux de formation disparates dans un cadre budgétaire restreint. Dans ce contexte comment relever le défi d’élaborer et de développer une dynamique de projet éducatif concerté dans tous les services qu’ils soient en collectivité ou à domicile, en milieu urbain ou rural ? Ce problème est clairement posé en Belgique francophone où aucune formation spécifique à l’enfance de niveau supérieur n’est organisée, où aucune expérience utile aux fonctions de direction n’est exigée à ce jour. Une recherche en voie de finalisation (juin 2015) visant à mieux définir les compétences nécessaires aux fonctions d’accueil et d’encadrement des services à l’enfance a permis d’associer une série d’acteurs de l’enfance, de l’enseignement, de la formation et de responsables politico-administratifs. Dans une démarche de recherche-action, il s’est agi de se décentrer des réalités de la Belgique francophone pour comprendre comment les questions se posent aussi dans d’autres contextes européens (France, Flandre, Angleterre, Suède) et ensuite, de prendre des décisions relatives à la redéfinition des référentiels métiers et de formation, à la révision des textes réglementaires pour les services. Tout en évitant de donner des directives universelles qui nieraient les spécificités de contexte, notre intervention propose de relever une série de questions clés relatives aux fonctions de direction, de points de vigilances à relever ainsi que des idées retenues comme essentielles pour l’avenir. [less ▲]

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See detailLe sort des travailleurs non repris en cas de transfert de leur entreprise
Kéfer, Fabienne ULg

Report (2015)

La situation des travailleurs non repris en cas de transfert d’entreprise évolue dans deux directions opposées, selon que le transfert est ou non réalisé sous autorité de justice. La protection des ... [more ▼]

La situation des travailleurs non repris en cas de transfert d’entreprise évolue dans deux directions opposées, selon que le transfert est ou non réalisé sous autorité de justice. La protection des travailleurs non repris en cas d’application de la convention collective n° 32bis est en voie d’extension. Les travailleurs licenciés juste avant la cession sont considérés comme toujours employés par le cédant à la date du transfert de sorte que leur créance est transférée au cessionnaire ; la Cour de cassation n’exige pas que, pour faire valoir ses droits vis-à-vis du cessionnaire, le salarié ait préalablement invité celui-ci à le reprendre à son service. Son arrêt du 29 avril 2013 clarifie la question de la sanction, en reconnaissant que l’ancien article 63 de la loi du 3 juillet 1978 est violé si un ouvrier a été licencié en violation de l’interdiction de licencier prévue l’article 9 de la convention collective n° 32bis, dont les auteurs n’avaient pas précisé la sanction. La similarité entre les concepts de l’article 63 et ceux de la convention collective n° 109 relative à la motivation du licenciement autorisent à penser que cet arrêt facilite aussi la tâche des travailleurs visés par cette dernière lorsqu’ils sont licenciés en violation de l’interdiction de licencier prévue l’article 9 de la convention collective n° 32bis. A l’inverse, les travailleurs non repris dans le cadre d’un transfert sous autorité de justice se trouvent assez démunis. Si la vente est autorisée sans que tous les salariés soient repris, ceux qui ne sont pas transférés conservent pour seul débiteur le cédant qui supportera seul le coût des licenciements alors qu’il est en difficulté financière. Sauf si la Cour de Justice devait un jour avoir l’occasion de décider que la directive 2001/23 est applicable à l’opération, il n’y a pas place ici pour la fiction du transfert des contrats de travail au cessionnaire, et donc le transfert de la créance d’indemnité de rupture. [less ▲]

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See detailDetermination of Zinc, Cadmium and Lead Bioavailability in Contaminated Soils at the Single-Cell Level by a Combination of Whole-Cell Biosensors and Flow Cytometry
Hurdebise, Quentin ULg; Tarayre, Cédric ULg; Fischer, Christophe ULg et al

in Sensors (2015)

Zinc, lead and cadmium are metallic trace elements (MTEs) that are widespread in the environment and tend to accumulate in soils because of their low mobility and non-degradability. The purpose of this ... [more ▼]

Zinc, lead and cadmium are metallic trace elements (MTEs) that are widespread in the environment and tend to accumulate in soils because of their low mobility and non-degradability. The purpose of this work is to evaluate the applicability of biosensors as tools able to provide data about the bioavailability of such MTEs in contaminated soils. Here, we tested the genetically-engineered strain Escherichia coli pPZntAgfp as a biosensor applicable to the detection of zinc, lead and cadmium by the biosynthesis of green fluorescent protein (GFP) accumulating inside the cells. Flow cytometry was used to investigate the fluorescence induced by the MTEs. A curvilinear response to zinc between 0 and 25 mg/L and another curvilinear response to cadmium between 0 and 1.5 mg/L were highlighted in liquid media, while lead did not produce exploitable results. The response relating to a Zn2+/Cd2+ ratio of 10 was further investigated. In these conditions, E. coli pPZntAgfp responded to cadmium only. Several contaminated soils with a Zn2+/Cd2+ ratio of 10 were analyzed with the biosensor, and the metallic concentrations were also measured by atomic absorption spectroscopy. Our results showed that E. coli pPZntAgfp could be used as a monitoring tool for contaminated soils being processed. [less ▲]

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See detailLa voix professionnelle
Garnier, Maëva; Remacle, Angélique ULg

Conference given outside the academic context (2015)

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See detailImpact of Aphasia on Consciousness Assessment: A Cross-Sectional Study.
Schnakers, C; Bessou, H; Rubi-Fessen, I et al

in Neurorehabilitation & Neural Repair (2015), 29

BACKGROUND: . Previous findings suggest that language disorders may occur in severely brain-injured patients and could interfere with behavioral assessments of consciousness. However, no study ... [more ▼]

BACKGROUND: . Previous findings suggest that language disorders may occur in severely brain-injured patients and could interfere with behavioral assessments of consciousness. However, no study investigated to what extent language impairment could affect patients' behavioral responses. OBJECTIVE: . To estimate the impact of receptive and/or productive language impairments on consciousness assessment. METHODS: . Twenty-four acute and subacute stroke patients with different types of aphasia (global, n = 11; Broca, n = 4; Wernicke, n = 3; anomic, n = 4; mixed, n = 2) were recruited in neurology and neurosurgery units as well as in rehabilitation centers. The Coma Recovery Scale-Revised (CRS-R) was administered. RESULTS: . We observed that 25% (6 out of 24) of stroke patients with a diagnosis of aphasia and 54% (6 out of 11) of patients with a diagnosis of global aphasia did not reach the maximal CRS-R total score of 23. An underestimation of the consciousness level was observed in 3 patients with global aphasia who could have been misdiagnosed as being in a minimally conscious state, even in the absence of any documented period of coma. More precisely, lower subscores were observed on the communication, motor, oromotor, and arousal subscales. CONCLUSION: . Consciousness assessment may be complicated by the co-occurrence of severe language deficits. This stresses the importance of developing new tools or identifying items in existing scales, which may allow the detection of language impairment in severely brain-injured patients. [less ▲]

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See detailSnow cover evolution during the last fifty years in the Hautes Fagnes (Belgium) using the regional climate MAR model
Wyard, Coraline ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Conference (2015, April 16)

The MAR model is a regional climate model originally developped for the polar regions to study the surface mass balance. In this study, the MAR model has been adapted to Belgium in order to study the snow ... [more ▼]

The MAR model is a regional climate model originally developped for the polar regions to study the surface mass balance. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolution of the Hautes Fagnes (south-east of Belgium), a region covered by snow one to two months per year. As validation, we have sucessfully compared MAR based daily snow heights with snowcam-based observations. Then, the model has been forced by ERA-Interim since 1958 to study the snow cover evolution during the last fifty years at the summit of Belgium. The results show non-significant trend. [less ▲]

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See detailGenetic correlations between methane production and milk fatty acid contents of Walloon Holstein cattle throughout the lactation
Vanrobays, Marie-Laure ULg; Vandenplas, Jérémie ULg; Bastin, Catherine ULg et al

Poster (2015, April 16)

Methane (CH4) from ruminal fermentation is the major greenhouse gas produced by dairy cattle which contributes largely to climate change. Production of CH4 also represents losses of gross energy intake ... [more ▼]

Methane (CH4) from ruminal fermentation is the major greenhouse gas produced by dairy cattle which contributes largely to climate change. Production of CH4 also represents losses of gross energy intake. Therefore, there is a growing interest in mitigating these emissions. Acetate and butyrate have common bio-chemical pathways with CH4. Because some milk fatty acids (FA) arise from acetate and butyrate, milk FA are often considered as potential predictors of CH4. However, relationships between these traits remain unclear. Moreover, the evolution of the phenotypic and genetic correlations of CH4 and milk FA across days in milk (DIM) has not been evaluated. The main goal of this study was to estimate genetic correlations between CH4 and milk FA contents throughout the lactation. Calibration equations predicting daily CH4 production (g/d) and milk FA contents (g/100 dL of milk) from milk mid-infrared (MIR) spectra were applied on MIR spectra related to Walloon milk recording. Data included 243,260 test-day records (between 5 and 365 DIM) from 33,850 first-parity Holstein cows collected in 630 herds. Pedigree included 109,975 animals. Bivariate (i.e., CH4 production and one of the FA traits) random regression test-day models were used to estimate genetic parameters of CH4 production and 7 groups of FA contents in milk. Saturated (SFA), short-chain (SCFA), and medium-chain FA (MCFA) showed positive averaged daily genetic correlations with CH4 production (from 0.25 to 0.29). Throughout the lactation, genetic correlations between SCFA and CH4 were low in the beginning of the lactation (0.11 at 5 DIM) and higher at the end of the lactation (0.54 at 365 DIM). Regarding SFA and MCFA, genetic correlations between these groups of FA and CH4 were more stable during the lactation with a slight increase (from 0.23 to 0.31 for SFA and from 0.23 to 0.29 for MCFA, at 5 and 365 DIM respectively). Furthermore, averaged daily genetic correlations between CH4 production and monounsaturated (MUFA), polyunsaturated (PUFA), unsaturated (UFA), and long-chain FA (LCFA) were low (from 0.00 to 0.15). However, these genetic correlations varied across DIM. Genetic correlations between CH4 and MUFA, PUFA, UFA, and LCFA were negative in early lactation (from -0.24 to -0.34 at 5 DIM) and increased afterward to become positive from 15 weeks till the end of the lactation (from 0.14 to 0.25 at 365 DIM). Finally, these results indicate that genetic and, therefore, phenotypic correlations between CH4 production and milk FA vary following lactation stage of the cow, a fact still often ignored when trying to predict CH4 production from FA composition. [less ▲]

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See detailVers une "dématérialisation" des droits fondamentaux? Convergence des droits fondamentaux dans une protection fragmentée, à la lumière du raisonnement du juge constitutionnel belge
Rosoux, Géraldine ULg

in Revue des droits et libertés fondamentaux (2015)

Cet article contient un résumé de thèse (RDLF 2015, thèse n° 10), disponible sur http://www.revuedlf.com/theses/vers-une-dematerialisation-des-droits-fondamentaux-convergence-des-droits-fondamentaux-dans ... [more ▼]

Cet article contient un résumé de thèse (RDLF 2015, thèse n° 10), disponible sur http://www.revuedlf.com/theses/vers-une-dematerialisation-des-droits-fondamentaux-convergence-des-droits-fondamentaux-dans-une-protection-fragmentee-a-la-lumiere-du-raisonnement-du-juge-constitutionnel-belge/ [less ▲]

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See detailEvaluation of soil structural changes through macroscopic and microscopic measurement
Parvin, Nargish ULg; Degré, Aurore ULg; Chelin, Marie ULg et al

Poster (2015, April 16)

The heterogeneity of soil structure and pore size distribution are highly influenced by external factors like tillage systems and other agricultural management practices. However, changes in soil ... [more ▼]

The heterogeneity of soil structure and pore size distribution are highly influenced by external factors like tillage systems and other agricultural management practices. However, changes in soil hydrodynamic behavior are not fully understood and are still under research. Also, researchers have explained the impact of tillage practices on soil hydraulic properties related to pore size distribution, connectivity and orientation are involved but the characterization of these modifications and consequences remains a challenge. Furthermore, the relation between macroscopic measurements and microscopic investigation of the soil structure remains scarce. Recently, X-ray tomography (X- μCT) has been used in order to characterize changes in soil pore size distribution in various contexts and the method is able to link microtomography information to hydrodynamic measurement. In our study, X-μCT has been used in order to characterize changes in soil pore system. Since, tomography does not count most of the micropores, Richards’ pressure plate and evaporation method was also combined to get complete range of pore size distribution. We found good match between evaporation data with X-μCT at the macropore scale and evaporation data with pressure plate method at micropore scale. X-μCT data refines retention and hydraulic curves near saturation where Richards’ data alone can lead to numerous sets of fitted parameters. On the otherhand, evaporation data (Hyprop apparatus ©) provide comparable datasets with X-μCT. Combining micro and macroscopic measurements allows us to validate X-μCT information, which is otherwise not so obvious. [less ▲]

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See detailCorrelation between levels of β-hydroxybutyrate and fatty acids in blood and milk and its impact on ketosis diagnosis in dairy cows
Lessire, Françoise ULg; Knapp, Emilie ULg; Dotreppe, Olivier et al

Poster (2015, April 16)

SKC at herd level is difficult to diagnose. Poor production and reproduction performances are usually observed as an increased incidence of periparturient diseases in the herd (Suthar et al., 2013 ... [more ▼]

SKC at herd level is difficult to diagnose. Poor production and reproduction performances are usually observed as an increased incidence of periparturient diseases in the herd (Suthar et al., 2013). Diagnosis methods include determination of beta-hydroxybutyrate (BHB) and increased non-esterified fatty acids (NEFA) resulting from body fat mobilization. BHB and NEFA could be dosed in blood of animals in late gestation and in early lactation. Post calving, cows presenting BHB over 1. 2-1.4 mmol/L are considered SCK-cows while those presenting NEFA over 0.6 mg/L are labelled fat mobilising cows. Development of non-invasive diagnosis techniques could be interesting to sample animals at a larger scale with lesser stress. The aim of this study was to verify whether blood and milk BHB values were correlated and whether diagnostic methods by milk analysis could be developed. Seventy -five cows out of 8 selected Walloon dairy herds were followed up monthly from calving to pregnancy diagnosis regarding production and reproduction. At each visit (V), BHB and NEFA levels were determined in milk and blood. A maximum of 5 V was made. BHB was determined in blood using a cow-side test and in milk by a colorimetric test . Blood NEFA and milk fatty acids were determined by gas chromatography (GC). Statistical analysis was performed by SAS 9.1. BHB levels in blood and milk were highly correlated (r= 0.86), indicating the possibility of diagnosis of SCK by milk sampling. The earliest the samples have been taken, the better the correlation is (r=0.95 V1; r = 0.91 V2). Comparison of BHB with NEFA demonstrated a better correlation with milk BHB than with blood BHB (respectively 0.51 and 0.53 in milk vs 0.41 and 0.48 in blood for the V1 and V2 respectively). After the 2d V, the correlation dropped to 0.38 (V3) and -0.14 (V4).To conclude, dosage of milk BHB could be a good indicator for ketosis diagnosis taking into account that correlation with blood BHB and with NEFA is time-related. [less ▲]

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See detailResponse letter-Comparative biochemical analysis after steam pretreatments of lignocellulosic biomass from six combined morphological parts of Williams Cavendish banana plant (Triploid Musa AAA group)
Kamdem, Irenée ULg

in Waste Management & Research : The Journal of the International Solid Wastes & Public Cleansing Association (2015)

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See detailLetter to editor-Comparative biochemical analysis after steam pretreatments of lignocellulosic biomass from six combined morphological parts of Williams Cavendish banana plant (Triploid Musa AAA group)
Kamdem, Irenée ULg

in Waste Management & Research : The Journal of the International Solid Wastes & Public Cleansing Association (2015)

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See detailL'impôt des personnes morales: un impôt méconnu à (re)découvrir - Actualité, champ d’application et enjeux
Garroy, Sabine ULg

in Bulletin juridique & social (2015), (540), 7-10

La loi-programme du 19 décembre 2014 a littéralement bouleversé le monde des intercommunales : automatiquement assujetties à l’impôt des personnes morales (ci-après : IPM) jusque-là (et quasiment ... [more ▼]

La loi-programme du 19 décembre 2014 a littéralement bouleversé le monde des intercommunales : automatiquement assujetties à l’impôt des personnes morales (ci-après : IPM) jusque-là (et quasiment défiscalisées), la volonté du gouvernement est d’aligner le traitement fiscal des intercommunales sur celui des entreprises privées « normales ». Les personnes morales de droit privé, au premier rang desquelles nous trouvons les associations sans but lucratif (ci-après : ASBL), doivent établir qu’elles ne se livrent pas à une exploitation ou à des opérations de caractère lucratif pour qu’elles soient soumises à l’IPM 1 ; les intercommunales se voient désormais soumises aux mêmes conditions. Ainsi, toutes les intercommunales ne vont pas en principe automatiquement basculer vers l’ISOC. Par contre, toutes les intercommunales, qu’elles demeurent sous le régime de l’IPM ou non, vont connaître des modifications de leur situation fiscale ; nous y reviendrons. Dans les lignes qui suivent, nous exposerons tout d’abord les critères d’assujettissement à l’IPM et à l’ISOC : ces critères constituent bien souvent pour les praticiens un véritable casse-tête chinois (section 1). La question de l’assujettissement est fondamentale vu les di érences qui existent entre ces deux régimes d’imposition ; être assujetti à l’IPM ou à l’ISOC représente donc un enjeu. Au sein même du seul régime d’imposition de l’IPM, nous verrons que des distinctions existent entre différentes catégories d’assujettis et que, là aussi, il est question d’en-jeu fiscal (section 2). Le nouveau régime d’imposition des intercommunales sera notre « fil rouge » ; il permettra de mieux mettre en évidence les implications pratiques des éléments évoqués. [less ▲]

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See detailRegularized focusing inversion of time-lapse electrical resistivity data: an approach to parametrize the minimum gradient support functional
Nguyen, Frédéric ULg; Hermans, Thomas ULg

Poster (2015, April 15)

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, geothermal heat exchange, site remediation or ... [more ▼]

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, geothermal heat exchange, site remediation or tracer tests. Based on these snapshots, one can infer qualitative information on the location and morphology of changes occurring in the subsurface but also quantitative estimates on the degree of changes in certain property such as temperature or total dissolved solid content. Analysis of these changes can provide direct insight into flow and transport and associated processes and controlling parameters. However, the reliability of the analysis is dependent on survey geometry, measurement schemes, data error, and regularization. Survey design parameters may be optimized prior to the monitoring survey. Regularization, on the other hand, may be chosen depending on available information collected during the monitoring. Common approaches consider smoothing model changes both in space and time but it is often needed to obtain a sharp temporal anomaly, for example in fractured aquifers. We here propose to use the alternative regularization approach based on minimum gradient support (MGS) (Zhdanov, 2002) for time-lapse surveys which will focus the changes in tomograms snapshots. MGS will limit the occurrences of changes in electrical resistivity but will also restrict the variations of these changes inside the different zones. A common difficulty encountered by practitioners in this type of regularization is the choice of an additional parameter, the so-called , required to define the MGS functional. To the best of our knowledge, there is no commonly accepted or standard methodology to optimize the MGS parameter . The inversion algorithm used in this study is CRTomo (Kemna 2000). It uses a Gauss-Newton scheme to iteratively minimize an objective function which consists of a data misfit functional and a model constraint functional. A univariate line search is performed at each Gauss-Newton iteration step to find the optimum value of the regularization parameter  which minimizes the data misfit as a function of  while the data misfit is above the desired value and yields the desired target misfit (root-mean square value of error-weighted data misfit equal to 1) at the last iteration for a maximum value of . We propose here to optimize the  of the MGS functional by considering a univariate line search at the first iteration to find the  that minimizes the data misfit. The parameter is then kept constant during the Gauss-Newton iterative scheme. In this contribution, we validate our approach on a numerical benchmark and apply it successfully on a case study in the context of salt tracers in fractured aquifers. Zhdanov M.S. 2002. Geophysical Inverse Theory and Regularization Problems. Elsevier, Amsterdam, 628 p. Kemna A. 2000. Tomographic Inversion of Complex Resistivity - Theory and Application. PhD Thesis, Ruhr University Bochum. [less ▲]

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See detailVariogram-based inversion of time-lapse electrical resistivity data: development and application to a thermal tracing experiment
Hermans, Thomas ULg; Nguyen, Frédéric ULg

Poster (2015, April 15)

Electrical resistivity tomography (ERT) has become a popular imaging methodology in a broad range of applications given its large sensitivity to subsurface parameters and its relative simplicity to ... [more ▼]

Electrical resistivity tomography (ERT) has become a popular imaging methodology in a broad range of applications given its large sensitivity to subsurface parameters and its relative simplicity to implement. More particularly, time-lapse ERT is now increasingly used for monitoring purposes in many contexts such as water content, permafrost, landslide, seawater intrusion, solute transport or heat transport experiments. Specific inversion schemes have been developed for time-lapse data sets. However, in contrast with static inversions for which many techniques including geostatistical, minimum support or structural inversion are commonly applied, most of the methodologies for time-lapse inversion still rely on non-physically based spatial and/or temporal smoothing of the parameters or parameter changes. In this work, we propose a time-lapse ERT inversion scheme based on the difference inversion scheme. We replace the standard smoothness-constraint regularization operator by the parameter change covariance matrix. This operator takes into account the correlation between changes in resistivity at different locations through a variogram computed using independent data (e.g., electromagnetic logs). It may vary for subsequent time-steps if the correlation length is time-dependent. The methodology is first validated and compared to the standard smoothness-constraint inversion using a synthetic benchmark simulating the injection of a conductive tracer into a homogeneous aquifer inducing changes in resistivity values of known correlation length. We analyze the influence of the assumed correlation length on inversion results. Globally, the method yields better results than the traditional smoothness constraint inversion. Even if a wrong correlation length is assumed, the method performs as well as the smoothness constraint since the regularization operator balances the weight given to the model constraint functional in the objective function. Then the methodology is successfully applied to a heat injection and pumping experiment in an alluvial aquifer. The comparison with direct measurements in boreholes (temperature loggers and distributed temperature sensing optic fibres) shows that ERT-derived temperatures and breakthrough curves image reliably the heat plume through time (increasing part of the curve, maximum and tail are correctly retrieved) and space (lateral variations of temperature are observed) with less spatial smoothing than standard methods. The development of new regularization operators for time-lapse inversion of ERT data is necessary given the broad range of applications where ERT monitoring is used. In many studies, independent data are available to derive geostatistical parameters that can be subsequently used to regularize geophysical inversions. In the future, the integration of spatio-temporal variograms into existing 4D inversion schemes should further improve ERT time-lapse imaging. [less ▲]

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See detailFirst evidence of Neandertal cannibalism in Northern Europe: the case of the “Troisieme Caverne” of Goyet (Belgium)
Rougier, H.; Crevecoeur, I.; Beauval, C. et al

Conference (2015, April 15)

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See detailRetrievals of formaldehyde from ground-based FTIR and MAX-DOAS observations at the Jungfraujoch station and comparisons with GEOS-Chem and IMAGES model simulations
Franco, Bruno ULg; Hendrick, François; Van Roozendael, Michel et al

in Atmospheric Measurement Techniques (2015), 8

As an ubiquitous product of the oxidation of many volatile organic compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation ... [more ▼]

As an ubiquitous product of the oxidation of many volatile organic compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation pathways leading to the formation of tropospheric ozone and secondary organic aerosols. In this study, HCHO profiles have been successfully retrieved from ground-based Fourier transform infrared (FTIR) solar spectra and UV-visible Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) scans recorded during the July 2010–December 2012 time period at the Jungfraujoch station (Swiss Alps, 46.5° N, 8.0° E, 3580m a.s.l.). Analysis of the retrieved products has revealed different vertical sensitivity between both remote sensing techniques. Furthermore, HCHO amounts simulated by two state-of-the-art chemical transport models (CTMs), GEOSChem and IMAGES v2, have been compared to FTIR total columns and MAX-DOAS 3.6–8 km partial columns, accounting for the respective vertical resolution of each ground-based instrument. Using the CTM outputs as the intermediate, FTIR and MAX-DOAS retrievals have shown consistent seasonal modulations of HCHO throughout the investigated period, characterized by summertime maximum and wintertime minimum. Such comparisons have also highlighted that FTIR and MAX-DOAS provide complementary products for the HCHO retrieval above the Jungfraujoch station. Finally, tests have revealed that the updated IR parameters from the HITRAN 2012 database have a cumulative effect and significantly decrease the retrieved HCHO columns with respect to the use of the HITRAN 2008 compilation. [less ▲]

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See detailCombining δ13C measurements and ERT imaging: improving our understanding of competition at the crop-soil-hedge interface
Hussain, Khalid; Wongleecharoen, Chalemchart; Hilger, Thomas et al

in Plant and Soil (2015)

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See detailThe seamod.ro operational stochasting forecasting system of the Black Sea
Vandenbulcke, Luc ULg; Barth, Alexander ULg; Capet, Arthur et al

Poster (2015, April 15)

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