Schoolbiologen zijn scholieren die onderzoeken hoe dieren en planten reageren op veranderingen in het klimaat. Hiervoor bepalen ze op verschillende momenten in het jaar de stand van de natuur. Ze volgen nauwlettend het wisselen van de seizoenen in de natuur. Ze kijken in de omgeving van hun eigen school of en hoe ver bomen, struiken en kruidachtige...
This paper reports on the canopy layer urban heat island (UHI) and human comfort in a range of small to large cities and villages in the Netherlands. So far, this subject has not been substantially studied in the Netherlands, since it has a relatively mild Cfb climate and impact was assumed to be minor. To fill this knowledge gap, this paper report...
This study presents an analysis of 195 rainfall events gathered with the X-band weather radar SOLIDAR and a tipping bucket rain gauge network near Delft, The Netherlands, between May 1993 and April 1994. The aim of this paper is to present a thorough analysis of a climatological dataset using a high spatial (120 m) and temporal (16 s) resolution X-...
In het kader van De Natuurkalender doen duizenden vrijwilligers en schoolbiologen waarnemingen in de natuur om de ontwikkelingen in de natuur bij te houden. In dit filmpje wordt een overzicht gegeven van hoe de lente aan het einde van maart en in het begin van april begon in de natuur.
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 th...
De KNMI-neerslagradars maken elke vijf minuten scans over heel Nederland, waarna vrijwel gelijk de neerslagintensiteitsbeelden kunnen worden bekeken op internet. Aangetoond is dat deze buienradars ook geschikt zijn om de kans op extreme hoeveelheden neerslag te bepalen. Handige informatie voor de ontwerpers van rioleringen en gemalen.
An 11 year high-quality radar rainfall data set is used to abstract annual maximum rainfall depths for durations of 15 min to 24 h and area sizes of 6 to 1.7 × 103 km2 for the Netherlands. Generalized extreme value (GEV) distributions are fitted to the annual maxima. A new method is presented to describe the distribution of extreme areal rainfall d...
In the present work Blackadar's concept on nocturnal inertial oscillations is extended. Blackadar's concept describes frictionless inertial oscillations above the nocturnal inversion layer. The current work includes frictional effects within the nocturnal boundary layer. As a result it is shown that the nocturnal wind speed profile describes an osc...
In this essay, Henk de Bruin shares his experiences in fostering research in the field of scintillometry, the applications of the technique to various topics in meteorology, as well as details of the way these flux measurements are obtained.
The paper describes a numerical interpretation of the April 2007 CarboEurope Regional Experiment Strategy (CERES) campaign, devotedto the study of CO2 cycle at the regional scale. The four consecutive clear sky days with intensive observations of CO2 concentration, 5 fluxes at the the surface and in the boundary layer have been simulated with the M...
