© Crown copyright Met Office DICE Workshop Met Office – 14 – 16 October 2013.

© Crown copyright Met Office

DICE WorkshopMet Office – 14 – 16 October 2013

© Crown copyright Met Office

Timetable

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Thermal coupling between boundary layer and land surface: The GLASS perspective

Martin Best (Met Office) and Joe Santanello (NASA), Co-chairs of GLASS

ECMWF/GABLS Workshop on diurnal cycles and the stable atmospheric boundary layer

7th – 10th November 2011, ECMWF

© Crown copyright Met Office

Results from GABLS-3

From: Holtslag_GABLS@WGNE_oct2010

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GABLS – 3 initialisation

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Results from GABLS-3

From: Holtslag_GABLS@WGNE_oct2010

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GLASS perspective:

No current interest in night time (stable BL)

Only studying daytime (unstable BL)!

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GLACE “hotspot” regions

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GABLS-2 results

From: http://www.misu.su.se/~gunilla/gabls/Results/index.html

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DICE experimental design

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Stage 1a

T, q, U

P, Sw↓, Lw↓

H λE τSw↑ Lw↑

Tscr, qscr, U10m

© Crown copyright Met Office

T, q, U

d

Stage 1b

θ

H λE τSw↑ Lw↑

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T, q, U

d

Stage 2

θ

H λE τSw↑ Lw↑

Tscr, qscr, U10m

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Simulations for analysis

Default initial run Optimised run Consistent surface turbulence run

Surface X ?B.L. XCoupled X ?

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Stage 3a

Ti, qi, UiPi, Sw↓i, Lw↓i

Hi λEi τiSw↑i Lw↑iTscri, qscri, U10mi

Less sensitiveMore sensitive

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Ti, qi, Ui

di

Stage 3b

θ

Hi λEi τiSw↑i Lw↑ i

Less sensitive More sensitive

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Land Surface Spin-Up

© Crown copyright Met Office

Land Surface Spin-Up

10 years

Saturated Soils

15 years

Dry Soils

1 year

Smileyberg forcing data

WATCH Forcing Dataset (WFD)

3 days