Www.met.rdg.ac.uk/~swr06iab Moisture Transport in Baroclinic Waves Ian Boutle a, Stephen Belcher a, Bob Plant a Bob Beare b, Andy Brown c 24 April 2014.

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Presentation transcript:

Moisture Transport in Baroclinic Waves Ian Boutle a, Stephen Belcher a, Bob Plant a Bob Beare b, Andy Brown c 24 April 2014 a University of Reading; b University of Exeter; c Met Office

Motivation & Aims Boundary layer couples the surface to the free troposphere – how does it link surface moisture fluxes to mid-level moisture? Cyclones bring heavy rain on their warm-conveyor belts – what is the source of this moisture? Cyclone waves are responsible for transporting moisture poleward on climatological timescales – how is this transport achieved at the scale of individual systems? 2

Model Setup Met Office Unified Model (MetUM) is used in Idealised mode 0.4° horizontal resolution (~44 km grid squares) 38 vertical levels with a well resolved boundary layer Boundary-layer scheme of Lock et al. with nonlocal mixing in CBL & cumulus/stratocumulus decoupling Mass-flux convection, mixed phase microphysics, large-scale cloud Sea-surface with fixed temperature 3

Initial Conditions Winds and Temperature:Specific Humidity: 4 Match closely climatological winter zonal-mean – perturb at wavenumber-6 to create LC1-type cyclone

5 Cloud Fraction and Rainrate over 14 days of the life cycle Life cycle

Boundary-Layer Moisture Budget Rate of change of total moisture in boundary layer Eulerian change in boundary-layer height Advection across boundary-layer top Horizontal divergence within the boundary layer Net vertical transport by boundary-layer turbulence Source and sink from microphysical processes 6

Flow across BL Top Large scale advection:Cumulus Convection: 7 WCB Frontal outflow and ascent Large amount of ventilation

Movement and sources Divergence in BL:Turbulent Flux: 8 Evaporation is main input Negative E WCB source

Conceptual Model 9

Ventilation of Moisture Warm-conveyor belt and shallow convection can ventilate similar amounts of moisture from the boundary layer Rainfall rate closely matches warm-conveyor belt ventilation – moisture is precipitated out quickly and efficiently 10

Transport in Troposphere 2 tracers emitted at surface and passed through different parameterisations. Tracer passed through Convection scheme gets advected with background flow towards cyclone cold front and poleward 11 Tracer difference at 3km – (All param – no convection)

Conclusions Moisture source for warm-conveyor belt precipitation lies well away from the cyclone Shallow convection adds a new pathway for ventilation and transport from regions with large surface evaporation Shallow convection equally important for ventilation and contributes to poleward moisture transport – consequences for climate models since this transport is done in a parameterisation! 12