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Klimaat algemeen

Kenniscentrum

Klimaat algemeen

22-10-10 Oratie Bart van den Hurk: Interactie tussen hemel en aarde

Inaugurele rede uitgesproken op 11 juli 2007 ter gelegenheid van het bekleden van de Buys Ballot leerstoel aan de Universiteit van Utrecht Koninklijk Nederlands Meteorologisch Instituut (KNMI) Instituut voor Marien en Atmosferisch onderzoek Utrecht (IMAU) De Buys Ballot leerstoel is ingesteld door ...

21-06-10 Baseline Surface Radiation Network (BSRN) station at the ...

Figure 1. Global map of all stations of the Baseline Surface Radiation Network (BSRN). The blue dots indicate fully operational stations (39) whereas the red dots indicate candidate stations (8) (situation: August 2006). KNMI participates in BSRN with the radiation station at the Cabauw observatory (51.97°N, 4.93°E)

Radiation is the primary energy source and the ultimate energy sink for the Earth’s climate system. Most climate changes are directly or indirectly caused by changes in radiation. It is therefore not an overstatement to say that understanding of the climate system begins with the understanding of ...

24-06-10 Accuracy assessment of an integrated profiling technique

Figure 1. Concept of the experimental setup applied in
this study.

Precise quantification of the atmospheric state is essential for climate research and weather prediction. Historically most of the operational atmospheric profiling is performed by radiosondes, but this network is under pressure due to the high costs, and operational alternatives are not available.

24-06-10 Upper Air Humidity observations using GPS

Figure 1: GPS receiver network used for processing at
KNMI. KNMI is generating two types of ZTD’s: an
observation available every hour (sites denoted by open
circles) and every 15 minutes (sites denoted by asterisk).

Humidity plays an important role in atmospheric processes like convection, cloud formation and precipitation, and it is highly variable in space and time. The current operational meteorological observing system relies almost entirely on radiosonde observation for upper air humidity measurements ...

24-06-10 Determination of the mixing layer height from ceilometer ...

Figure 1. Map of the KNMI meteorological observation network in The Netherlands. The locations with a LD-40 ceilometer (inset photograph) are represented by black dots.

The mixing layer height (MLH) is a key parameter in studies of many atmospheric boundary layer processes, including air quality. It primarily determines the volume in which turbulence is active and into which constituents, which are emitted near the surface, are dispersed ...

25-06-10 ADAGUC: a project to provide convenient access to the data ...

Figure 1a. Monthly average of Sciamachy NO2 tropospheric columns over Europe visualized in Google Earth.

In its role as a National Data Centre the Royal Netherlands Meteorological Institute is hosting a true treasure in the form of many unique datasets. This treasure grows every day but it is a common property of treasures that accessing them can be difficult ...

25-06-10 Changes in the Atlantic Meridional Overturning Circulation

Figure 1. The present day ensemble mean MOC estimated from an ensemble of coupled model integrations carried out with the Max Planck Institute climate model within the ESSENCE project run at KNMI (in Sv = 10^6 m3 s-1).

Climate models project a slow down of the Atlantic Meridional Overturning Circulation (MOC) in the twenty-first century. This slow down is expected to affect climate over Europe. In particular, it damps the temperature rise due to the emission of enhanced greenhouse gases ...

25-06-10 An integral approach for the representation of Turbulence, ...

Figure 1. Sketch of a convective updraft embedded in a turbulent eddy structure.

Notwithstanding the ever increasing computer resources, it is probably fair to state that most of the crucial processes in the clear and cloudy boundary layer will remain unresolved for both Numerical Weather Prediction (NWP) and climate models in the foreseeable future ...

01-12-06 Communicatie over klimaatonderzoek

Figuur 1. De Nederlandse delegatie bij de vergadering van werkgroep 1 van het IPCC in Madrid in 1995. Van links naar rechts: Aad van Ulden, Gerbrand Komen (beiden KNMI) en Leo Meyer (toen VROM, thans MNP en Hoofd van de Technical Support Unit van werkgroep 3).

Hoe gaat het in de praktijk als je wetenschappelijk ambtenaar bent en geacht wordt de minister en haar beleid te dienen? In het juni-nummer van Meteorologica liet Huug van de Dool ons in de keuken van de Amerikaanse ambtenaren kijken. In dit artikel zal ik op verzoek van de redactie iets over mijn ...

10-04-06 Overstromingen Europa 2006: veel gestelde vragen

Vraag (V): Was de waterstand in de Elbe in 2006 ongekend hoog?Antwoord (A): De waterstand in de Elbe heeft op in de loop van april op verscheidene plaatsen het recordniveau van de zomer 2002 overtroffen. De waterstand bereikte hier ook in 1845, 1890, 1903, 1930 en 1997 record hoogten ...

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