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The ECMWF/GABLS Workshop on "Diurnal cycles and the stable atmospheric boundary layer " was held 7 to 10 November 2011
The proceedings of the workshop have been published.
High resolution image
The diurnal cycles of temperature and wind are strongly influenced by small scale atmospheric processes in the stable boundary layer, in particular due to turbulent diffusion, gravity waves and radiation. Also the thermal coupling with the underlying soil through vegetation and snow plays an important role. Most large scale atmospheric models utilize rather diffusive boundary layer schemes resulting in stable boundary layers that are too thick and which show too little wind turning. Furthermore, the small scale stable boundary layer processes have strong implications for winter time temperature over continental areas, and as such making the topic an important climate issue as well. Night time wind extremes above the boundary layer are often not well represented and highly relevant for wind energy. However, attempts to implement less diffusive boundary layer schemes have shown poor objective scores and difficulties with night time and winter time continental temperatures.
The workshop reviewed the relevant research, considered the available schemes, explored the recent data sets and set out to make recommendations for large scale models.
Organisers and contact information
Workshop organisers:
- Anton Beljaars (ECMWF) anton.beljaars (at) ecmwf.int
Gunilla Svensson (Stockholm Univ., GABLS) gunilla (at) misu.su.se
Bert.Holtslag (Wageningen Univ., GABLS) Bert.Holtslag (at) wur.nl
- ECMWF contact Els Kooij-Connally
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