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Research
Dr. A. Pier Siebesma
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Department: Climate Research & Seismology
Section: Regional Climate
Function: Senior Researcher
Address: P.O. Box 201, 3730 AE De Bilt, The Netherlands
Telephone: +31 30 2206760
Telefax: +31 30 2202570
Email: siebesma@knmi.nl
Webpage: www.knmi.nl/~siebesma
 
Research
Research Topics
Research Stragey
Model Parameterization Strategy
Used Models
Current Projects
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Publications
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agenda
Various
GEWEX Cloud System Studies (GCSS)
GCSS Boundary Layer Clouds Working Group
PAN-GCSS Conference Toulouse 2008
KNMI links
Research
Agenda
Models
Dutch Atmospheric Large Eddy Simulation model (DALES)
Regional Atmospheric Climate Model (RACMO)
EC-Earth

Research Topics

The main focus is to understand, to simulate, and ultimately to parameterize

  • atmospheric turbulence
  • dry and moist atmospheric convection
  • clouds: dynamics, microphysics and radiation

which are all key processes in the atmospheric component of our climate system.

Research Strategy

Understanding of these processes is gained through combining:


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              Observations                           Large Eddy Simulations (LES)                             Analysis


Model Parameterization Strategy

Parameterizations of these processes are being developed using Single Column Model (SCM) versions of the Climate and Numerical Weather Prediction (NWP) model. This essentially the strategy developed and promoted by the GEWEX Cloud System Study (GCSS):

Used Models

We use a hierarchy of models:
  • Dutch Large Eddy Simulation Model (DALES).
    This is a high resolution non-hydrostatic model that is used as a numerical laboratory in order to research clouds, convection and turbulence.
  • Regional Atmospheric Climate Model (RACMO).
    This is a regional climate model that is currently used to perform high-resolution climate runs over Europe, Greenland and Antartica. The physics of the latest version is based on the ECMWF physics package cy31r1.
  • EC-Earth. This is the name of a an EARTH system model that is being developed by a number of European National Weather Services. The atmospheric part is based on the ECMWF seasonal forecast suite System 3 which has become operational March 15 2007

Current Projects

Parameterization training course

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