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Deutscher Wetterdienst
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM Rome 05 September 2011
Validation results of a sensitivity experiment with the COSMO-7
using the SRNWP data pool
G. Vogel and J.-P. Schulz
Deutscher Wetterdienst
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Setup of the COSMO-7 experiment
Assimilation runs with initial and boundary values (including soil) taken from IFS
New external parameters for PLCV and LAI (SEAWIFS), maps of IR-emissivity and of minimum stomatal resistance
Use of TERRA (COSMO-version 4.12) with options ( ground- water coupling, exponential depletion of rooting density with depth, heat conductivity depending on current soil water content)
New lake and snow modules
New climatology for aerosol species
Period of time: January 2007 – December 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
SRNWP sites
Operational soil, surface, and
boundary layer measurements available for the
years 2007 – 2009.
CAR
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Soil layer 9cm – 27cm
LGS
TOU
SPC
2007 2008 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Soil layer 27cm – 81cm
LIN
TOU
SPC
2007 2008 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Lindenberg (Falkenberg)
Toulouse (Fauga-Mauzac)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Accumulated evapotranspiration sum 2009
Lindenberg (Falkenberg)
Toulouse (Fauga-Mauzac)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Offline sensitivity studies
Lindenberg (Falkenberg)Soil moisture (9cm - 27cm)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Falkenberg 2009
-based
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Offline sensitivity studies
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Lindenberg (Falkenberg)
Toulouse (Fauga-Mauzac)
San Pietro Capofiume
July 2009Soil temperature (-6cm) Soil temperature (-18cm)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
solar radiation balance * 0.60
IR-emissivity *0.90
thermal conductivity *0.5
all modifications together
Offline sensitivity studies
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
vegetation effect only vegetation + therm. cond.
Offline sensitivity studies
therm. cond. *0.5
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Comparison with measured soil heat fluxes
Sensitivitiy study with an ssumed vertical profile of heat conductivity
Offline sensitivity studies
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Conclusions
The SRNWP data pool facilitates systematic validation studies over contrasting natural surfaces in different climate regions. Its build-up should be continued. In particular, the site owners should enhance their activities to reduce the data gaps.
The parameterization of the rooting properties yet exhibits defi-ciencies. There are some proposals for improving. They should be tested in the entire model domain.
In order to get more realistic soil temperatures the current ap-proach of the thermal conductivity should be revised.
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Thank you for your attention!
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Falkenberg 2009
-based
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
min_max_min__
min_min_ rootdprootdp
plcvavgplcv
plcvplcvrootdprootdp
SEAWIFSSEAWIFS
SEAWIFSSEAWIFSSEAWIFS
rootdp_min (= 0.12m or e.g. half of maximum value)
rootdp_max (see look-up table)
plcovSEAWIFS current plant cover value from SEAWIFS
plcv_minSEAWIFS minimum plant cover from SEAWIFS in the annual cycle
Plcv_avgSEAWIFS averaged maximum plant cover from SEAWIFS values (June – August)
Adaption of rooting depth to SEAWIFS-based plant cover in the annual cycle
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
plcv (SEAWIFS) Rooting depth (op.)Rooting depth (intp)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Dependency of soil moisture on soil type
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
SRNWP sites
Operational soil, surface, and
boundary layer measurements available for the
years 2007 – 2009.
( )
( )
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Interdiurnal change
of soil moisture at
Falkenberg
during spring-summer 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
TOU 2009
Bowen ratio
0.37 1.17 1.01
Bowen ratio
1.12 1.46 1.69
CAB 2009
LGS 2009
Bowen ratio
0.45 1.08 1.04
Radiation balance Latent heat flux Sensible heat flux
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Payerne
Cabauw
Cardington
July 2009Soil temperature (-6cm) Soil temperature (-18cm)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Impact of vegetation on measured soil temperatures
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
z
wD
zL
z
T
zt
Tc vapww
ss
z
TQ surfsurf
constTlb Boundary conditions:
drydrysateK
7.2logexp 10 w
Heat conduction equation (Peters-Lidard (1998):
Current approach (Johansen, 1975):
McCumber and Pielke (1981) :
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Soil temperatures and soil heat flux in coniferous forest (Kehrigk)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
LGS (Cfb): humid temperate climate, cool summer, no dry season
TOU (Csa): humide temperate climate, hot and dry summer, mediterranean
SPC (Cfa): humide temperate climate, hot summer, no dry season
Climate conditions at SRNWP sites
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
Impact of COSMO-7 modifications on annual precipitation
Lindenberg Meteorological Observatory – Richard Aßmann Observatory G. Vogel COSMO GM 05 September 2011
External parameters at the SRNWP sites
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