Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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The Third GABLS Intercomparison Case for Evaluation Studies of Boundary-Layer Models. Part A: Case Selection and Set-Up
Bosveld, F.C. ; Baas, P. ; Meijgaard, E. van; Bruijn, E.I.F. de; Steeneveld, G.J. ; Holtslag, A.A.M. - \ 2014
Boundary-Layer Meteorology 152 (2014)2. - ISSN 0006-8314 - p. 133 - 156.
low-level jets - land-surface - weather research - radiation fog - cabauw - climate - parametrizations - netherlands - performance - prediction
We describe a novel methodology on the selection and composition of a single-case observational dataset from the comprehensive measurement program at the Cabauw observatory field site located in the Netherlands. The case can be regarded as the basis of the third case study conducted within the framework of the GEWEX (Global Energy and Water Exchange) Atmospheric Boundary-Layer Study (GABLS) and is meant to be used for the evaluation of single-column models. The ideal case is supposed to cover a period of at least 24 h with clear skies, moderate near-surface winds and a stable stratification during nighttime. From the multi-year data archive with Cabauw observations data for 1–2 July 2006 were found to best match the requirements, and were consequently selected for analysis. The dates contains a 24-h period with a nearly constant geostrophic wind of ˜ 7 m s -1 , and a considerable wind shear in the vertical. It is also characterized by a pronounced low-level jet related to an inertial oscillation that developed around sunset when the atmosphere had decoupled from the surface. Detailed initial conditions, surface conditions and dynamical forcings are derived on the basis of local observations and the outcome of a conceptual and a three-dimensional atmospheric model. It appears that a very precise prescription of the forcings is a prerequisite to enable a meaningful evaluation of models against observational data
Refinement and application of a regional atmospheric model for climate scenario calculations of Western Europe
Meijgaard, E. van; Ulft, L.H. van; Lenderink, G. ; Roode, S.R. de; Wipfler, E.L. ; Boers, R. ; Timmermans, R.M.A. van - \ 2012
Wageningen : KVR (KVR report KVR 054/12) - ISBN 9789088150463 - 44
klimaatverandering - scenario-analyse - temperatuur - neerslag - aërosolen - grenslaagmeteorologie - modellen - noordzee - nederland - climatic change - scenario analysis - temperature - precipitation - aerosols - boundary-layer meteorology - models - north sea - netherlands
Het KNMI regionaal klimaat model RACMO wordt in toenemende mate gebruikt bij de detaillering van Klimaatscenario’s. Voorbeelden zijn de frequentie en intensiteit van hittegolven en de veranderingen daarin. Of te verwachten wijzigingen in het optreden van lokale neerslagextremen. In dit project zijn een aantal componenten van RACMO verder ontwikkeld. De bodemhydrologie van het model is verder verfijnd door ruimtelijke heterogeniteit in te voeren voor een aantal bodemparameters, zoals bodemtype en worteldiepte. Deze aanpassing resulteert in meer uitgesproken ruimtelijke structuren op regionale schaal.
Soil moisture and root water uptake in climate models. Research Programme Climate Changes Spatial Planning
Dam, J.C. van; Metselaar, K. ; Wipfler, E.L. ; Feddes, R.A. ; Meijgaard, E. van; Hurk, B. van den - \ 2011
WUR + Royal Netherlands Meteorological Institute - ISBN 9789088150128 - 62
bodemwater - bodem-plant relaties - waterbalans - evaporatie - ecohydrologie - klimaatverandering - modellen - soil water - soil plant relationships - water balance - evaporation - ecohydrology - climatic change - models
More accurate simulation of the energy and water balance near the Earth surface is important to improve the performance of regional climate models. We used a detailed ecohydrological model to rank the importance of vegetation and soil factors with respect to evapotranspiration modeling. The results show that type of lower boundary condition, root zone depth, and temporal course of leaf area index have the strongest effect on yearly and monthly evapotranspiration. Soil texture data from the WISE database in combination with HYPRESS pedotransferfunctions can be used to derive more accurate Mualem-van Genuchten type soil moisture retention and hydraulic conductivity functions. We added recent literature data on root densities of agricultural crops to the root data base of Schenk and Jackson. We tested the HTESSEL land routine of the regional climate model RACMO for Western Hungary, which shows systematically too low evapotranspiration and too high air temperatures in many numerical regional climate studies. Satellite remote sensing data, in combination with the SEBAL algorithm, were used to derive evapotranspiration fluxes at a 1x1 km grid for the year 2005. Compared to satellite data, HTESSEL somewhat underestimated evapotranspiration fluxes. This underestimation occurred mainly in regions with irrigation and shallow groundwater, factors which are not included in HTESSEL. Tests with other reduction functions for root water uptake, more realistic soil depth, and a concept for groundwater influence did not yield more accurate spatially distributed evapotranspiration fluxes for Western Hungary.
Seasonal evaluation of the land surface sheme HTESSEL against remote sensing derived energy fluxes of the Transdanubian regions in Hungary
Wipfler, E.L. ; Metselaar, K. ; Dam, J.C. van; Feddes, R.A. ; Meijgaard, E. van; Ulft, L.H. van; Hurk, B. van den; Zwart, S.J. ; Bastiaanssen, W.G.M. - \ 2011
Hydrology and Earth System Sciences 15 (2011)4. - ISSN 1027-5606 - p. 1257 - 1271.
aardoppervlak - evapotranspiratie - remote sensing - klimaatverandering - modellen - hongarije - land surface - evapotranspiration - climatic change - models - hungary - terrestrial water storage - era-40 reanalysis - balance closure - climate models - field - atmosphere - hydrology - impact - basin
The skill of the land surface model HTESSEL is assessed to reproduce evaporation in response to land surface characteristics and atmospheric forcing, both being spatially variable. Evaporation estimates for the 2005 growing season are inferred from satellite observations of the Western part of Hungary and compared to model outcomes. Atmospheric forcings are obtained from a hindcast run with the Regional Climate Model RACMO2. Although HTESSEL slightly underpredicts the seasonal evaporative fraction as compared to satellite estimates, the mean, 10th and 90th percentile of this variable are of the same magnitude as the satellite observations. The initial water as stored in the soil and snow layer does not have a significant effect on the statistical properties of the evaporative fraction. However, the spatial distribution of the initial soil and snow water significantly affects the spatial distribution of the calculated evaporative fraction and the models ability to reproduce evaporation correctly in low precipitation areas in the considered region. HTESSEL performs weaker in dryer areas. In Western Hungary these areas are situated in the Danube valley, which is partly covered by irrigated cropland and which also may be affected by shallow groundwater. Incorporating (lateral) groundwater flow and irrigation, processes that are not included now, may improve HTESSELs ability to predict evaporation correctly. Evaluation of the model skills using other test areas and larger evaluation periods is needed to confirm the results.
KKF-Model Platform Coupling : summary report KKF01b
Schellekens, J. ; Veldhuizen, A.A. ; Manders, A.M.M. ; Winsemius, H.C.M. ; Verseveld, W.J. ; Linde, A.H. te; Ulft, L.H. van; Meijgaard, E. van; Schaap, M. ; Barendregt, A. ; Schot, P.P. ; Wassen, M.J. ; Ward, P.J. ; Veldkamp, T.I.E. ; Mulder, H.M. ; Verkaik, J. - \ 2010
Utrecht : Knowledge for Climate Programme Office - ISBN 9789490070007 - 48
klimaatverandering - hydrologie van stroomgebieden - modellen - climatic change - catchment hydrology - models
Nederland bereidt zich voor op een sneller stijgende zeespiegel en een veranderend klimaat. Hiervoor is het Deltaprogramma gestart. Dit deltaprogramma voorziet een serie beslissingen die grote gevolgen zullen hebben voor het beheer van het water in Nederland. Om deze beslissingen zorgvuldig te nemen is informatie nodig over hoe het klimaat en de stijgende zeespiegel dit waterbeheer zullen beïnvloeden. De modellen die de gevolgen van klimaatverandering berekenen zullen daarom met dezelfde klimaat forcering en gekoppeld aan elkaar moeten worden gebruikt. In dit onderzoek is gekeken naar het linken van hydrologische en hydrodynamische modellen – en daaraan gekoppelde modellen die de ontwikkelingen in natuur en landgebruik modelleren -- die het gebied van de Alpen tot en met de Noordzee inclusief Nederland beschrijven.
How to design single-column model experiments for comparison with observed nocturnal low-level jets
Baas, P. ; Bosveld, F.C. ; Lenderink, G. ; Meijgaard, E. van; Holtslag, A.A.M. - \ 2010
Quarterly Journal of the Royal Meteorological Society 136 (2010)648. - ISSN 0035-9009 - p. 671 - 684.
atmosferische grenslaag - simulatiemodellen - evaluatie - meteorologische waarnemingen - luchtstroming - turbulentie - atmospheric boundary-layer - simulation models - evaluation - meteorological observations - air flow - turbulence - stably stratified conditions - wind-structure variations - energy closure-model - land-surface - diurnal cycle - soil-moisture - stratocumulus - flux - cabauw
Single-column models (SCMs) are widely employed to evaluate boundary-layer parametrizations under well-controlled conditions. To compare SCM results to observations, these models must be driven by realistic forcings of the three-dimensional (3D) atmospheric state. However, these forcings are inherently uncertain. The central research question is therefore: can observations be used to distinguish between different parametrization schemes in SCM simulations or is the spread due to uncertainties in the forcings too large? This study investigates this question for the nocturnal low-level jet (LLJ) at Cabauw. First, we analyse a single LLJ case that has been used for the third GEWEX Atmospheric Boundary Layer Studies (GABLS3) intercomparison study. To estimate the forcings, for this case a blend of local observations and 3D model output has been used. A sensitivity study to both the forcings and the turbulence formulation is performed by using the SCM version of the ECMWF model. The sensitivity to the turbulence parametrization is largest in the bulk of the stable boundary layer (SBL). The influence of the forcings manifests itself mainly in the upper part of the SBL and above. Second, an ensemble of eight comparable LLJ cases is considered. Using forcings derived from 3D model integrations, SCM results of the separate cases show significant deviations from the observations. However, the mean of the SCM simulations agrees well with the mean of the observations. Based on the eight selected LLJ cases, a composite SCM case is defined from the mean forcings of the 3D model. This improves the signal-to-noise ratio, which enables a better judgement of the quality of boundary-layer parametrizations in a comparison with the observations
Testing of modifications in the land surface scheme HTESSEL
Wipfler, E.L. ; Metselaar, K. ; Dam, J.C. van; Feddes, R.A. ; Meijgaard, E. van; Hurk, B.J.J.M. van den; Zwart, S.J. ; Bastiaansen, W.G.M. - \ 2008
klimaat - modellen - verandering - vochtigheid - bodem - lucht - aardoppervlak - climate - models - change - humidity - soil - air - land surface
The land surface scheme HTESSEL has been revised including flexible numerical discretization, a soil depth according to the FAO soil map, a modification of root water uptake parameters, and the effect of shallow groundwater
Aandacht voor veiligheid
Aerts, J. ; Sprong, T. ; Bannink, B. ; Bessembinder, J. ; Koomen, E. ; Jacobs, Ch ; Hoeven, N. van der; Huitema, D. ; Klooster, S. van 't; Veraart, J.A. ; Walraven, A. ; Jonkman, S.N. ; Maaskant, B. ; Bouwer, L.M. ; Bruijn, K. de; Oosterveld, E. ; Schuurman, H. ; Peters, K. ; Ottevanger, W. ; Immerzeel, W. ; Droogers, P. ; Kwadijk, J. ; Kind, J. ; Voogt, L. ; Klis, H. van der; Dellink, R. ; Affolter, F. ; Bubeck, Ph. ; Meulen, M. van der; Lange, G. de; Bregman, B. ; Brink, H. van den; Buiteveld, H. ; Drijfhout, S. ; Feijt, A. ; Hazeleger, W. ; Hurk, B.J.J.M. van den; Katsman, C. ; Kattenberg, A. ; Lenderink, G. ; Meijgaard, E. van; Siegmund, P. ; Wit, M. de; Naples, M. - \ 2008
rotterdam : AVV (Rapport / Leven met Water 009/2008) - ISBN 9789088150043 - 196
waterbeheer - klimaatverandering - veiligheid - kustgebieden - inundatie - infrastructuur - beleid - nederland - water management - climatic change - safety - coastal areas - flooding - infrastructure - policy - netherlands
De komende decennia worden er tussen de 500.000 en 1.500.000 woningen gebouwd waarvan een groot deel in laag Nederland. Deze studie laat zien dat door deze woningen overstromingsbestendig te bouwen schadereductie mogelijk is. Het schaderisico wordt dan nog eens een factor 2 minder als naast een Business as Usual variant nieuwbouwwoningen worden opgehoogd tot +5 m NAP. De kosten van opgehoogde nieuwbouwhuizen zijn hoger en variëren tussen de 0,4 en 1.7 miljard euro/jaar, hetgeen overeenkomt met 0,1-0,5% van het BNP. Dijkversterking levert de hoogste reductie op in het schaderisico bij de gehanteerde scenario’s. Gevolgbeperkende maatregelen in de ruimtelijk ordening als additionele oplossingsrichting zijn echter goed mogelijk als er ook een economische perspectief is bijvoorbeeld door middel van multifunctioneel ruimtegebruik.
The quality of horizontal advective tendencies in atmospheric models for the 3rd GABLS SCM intercomparison case
Bosveld, F.C. ; Meijgaard, E. van; Bruijn, C. de; Steeneveld, G.J. - \ 2008
Evaluation of the ECHAM4 cloud-turbulence scheme for stratocumulus
Lenderink, G. ; Meijgaard, E. van; Holtslag, A.A.M. - \ 2000
Meteorologische Zeitschrift 9 (2000)1. - ISSN 0941-2948 - p. 41 - 47.
A new methodology for assimilation of initial soil moisture fields in weather prediction models using Meteosat and NOAA data
Hurk, B.J.J.M. van den; Bastiaanssen, W.G.M. ; Pelgrum, H. ; Meijgaard, E. van - \ 1997
Journal of Applied Meteorology 36 (1997). - ISSN 0894-8763 - p. 1271 - 1283.
A Comparison of Boundary Layer Diffusion Schemes in Unstable Conditions Over Land
Holtslag, A.A.M. ; Meijgaard, E. van; Rooy, W.C. de - \ 1995
Boundary-Layer Meteorology 76 (1995)1/2. - ISSN 0006-8314 - p. 69 - 95.
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