The formation of mesoscale fluctuations by boundary layer convection

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Presentation transcript:

The formation of mesoscale fluctuations by boundary layer convection Harm Jonker

A spectral gap? (Stull)

Cold Air Outbreak time

LES of Sc (ASTEX) Liquid water path L = 25.6km (16hr) L = 12.8km Dx = Dy = 100m L = 25.6km (16hr) L = 12.8km (12hr) L = 6.4km (8hr) “Large Eddy Simulations: How large is large enough?”, de Roode, Duynkerke, Jonker, JAS 2004 “How long is long enough when measuring ﬂuxes and other turbulence statistics?”, Lenschow, et al. J. Atmos. Oceanic Technol., 1994

qt u lwp w

Intermediate Conclusions 1) the formation of dominating mesoscale fluctuations is an integral part of PBL dynamics! - no mesoscale forcings - what is the origin (mechanism) ? - latent heat release - radiative cooling - entrainment - inverse cascade Atkinson and Zhang Fiedler, van Delden, Muller and Chlond, Randall and Shao, Dornbrack, ……

Convective Atmospheric Boundary Layer penetrative convection  entrainment entrainment zi heat flux tracer flux

Saline convection tank Laser Induced Fluorescence (LIF) digital camera Han van Dop, IMAU Mark Hibberd, CSIRO Jos Verdoold, Thijs Heus, Esther Hagen fresh water Laser salt water (2%) r(z) buoyancy flux & tracer flux fresh water + fluorescent dye Dp

Laser Induced Fluorescence

Laser Induced Fluorescence (LIF) “bottom-up” tracer boundary layer depth structure (Verdoold, Delft, 2001) (see also van Dop, et al. BLM 2005)

Conclusions 1) the formation of dominating mesoscale fluctuations is an integral part of PBL convective dynamics! 2) latent heat and radiation are not essential (but speed up the process considerably) 3) budgets: no inverse cascade on average. significant backscatter (on all scales) 4) production: ineffective (slow), but spectral transfer is just as ineffective 5) the spectral behaviour of w at large scales is crucial