lindenberg meteorological observatory – richard aßmann observatory cosmo gm moscow september 2010...
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Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Local validation of numerical experiments with the COSMO-EU
G. Vogel and J. Helmert
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Model experiments with COSMO-EU
EXP CE 6795 exponential depletion of root density with depth groundwater coupling
bare soil evaporation (Noilhan & Planton, 1989) run without soil moisture analysis (SMA)
EXP CE 7224 modified aerosol loading + SEAWIFS-based plcv and LAI
areal pattern of minimum stomatal resistance (crsmin) groundwater coupling + modified rooting density profile + SMA
EXP CE 7533 modified aerosol loading + SEAWIFS-based plcv and LAI areal pattern of halved minimum stomatal resistance (crsmin)
groundwater coupling + modified rooting density profile + SMA
Local validation of results at Falkenberg, Payerne and Toulouse
(March - May 2009)
(June 2009)
(June 2009)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
All meteorological conditions
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Impact of plant cover and rooting depth on temporal variation of soil moisture
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
standard parameterisation modification
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Impact of plant cover and rooting depth on temporal variation of soil moisture
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Falkenberg 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Impact of plant cover and rooting depth on soil moisture development during spring 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Richard equation for water transfer
)()1()( nnn DwA
Variants of the lower boundary conditions (rigid lid, standard drainage and complete groundwater coupling) should be considered in the D-Term
z
F
t
ww
2/1
)(
2/1
)1/(1
)1/()(
2/1
)(
2/1
)1/()1/(1)()()1(
)(k
nw
k
nnk
nnkn
w
k
nw
k
nnk
nnkn
wnk
nk K
dzms
wwDK
dzms
wwD
kdzhs
tww
)()()1( nnn DAw1
Transfer functions according to Rijtema (1969)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
)(1
)1()(1
nnn DwA
)(2
)1()(2
nnn DwA
)(1)( nnn DwA
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
0cm - 9cm
sand
9cm –
27cm
loam
no vegetation
standard drainage
Forcing data taken from Falkenberg 2003
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Conclusions
The TERRA module simulates the soil moisture decrease during spring reasonably well if the local vegetation properties are realistically prescri-bed.
Crucial vegetation parameters are the rooting density and depth as well as the minimum stomatal resistance.
If satellite-based values are used, the rooting depth should also be made consistent to them in the annual cycle.
The TERRA module is likewise able to simulate the water transfer under inhomogeneous soil conditions after some modifications of the transfer scheme.
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Thank you for your attention
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
D:\IDL\Moscow\sm_FKB_MAM2009.jpg
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Falkenberg 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Falkenberg 2009
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
*0.58 *2.00
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Accumulated evapotranspiration
Bowen-ratio (9-15 UTC)
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
rootdp_min = 0.12m (or e.g. half of maximum value)
rootdp_max= 0.60 m (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)
min_max_min__
min_min_ rootdprootdp
plcvavgplcv
plcvplcvrootdprootdp
SEAWIFSSEAWIFS
SEAWIFSSEAWIFSSEAWIFS
Adaption of rooting depth to SEAWIFS-based plant cover in the annual cycle
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
10 fac
minmaxmin covcovcovcov plplfacplpl
minmaxmin lailaifaclailai
2max 58.012.0,min facrootdprootdp
281.9090.5expsin12.1 hsurfEdv
bvjdfac
bv
dv
ev
rv
quadratic interpolation
quadratic interpolation
Maximum values (plcov, lai, rootdp)
Minimum values (plcov, lai, rootdp)
Minimum values (plcov, lai, rootdp)annual cycle
Parametrisierung des Jahresgangs
jd: Julian day hsurf: height above sea level
bv: start of season (2009: 85) dv: vegetation developed (2009: 115)
rv: veg. begins to „redevelop“ (2009: 215) ev: end of season (2009: 238)
bv,dv = functions of latitude
jd=1,365
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
Toulouse Payerne Falkenberg
22.8 M% clay
32.0 M% sand 26 M% clay, 74 M% sand
40 M% clay, 60 M% sand
0 - 0.30m
0.30 - 0.60m
0.60 - 1.20m
0 - 0.30m
0.30 - 0.80m
Sl3
Slu
field capacity 26 V%
pore volume 37 V%
field capacity 28 V%
pore volume 36 V%
field capacity 24 V%
pore volume 34 V%
wilting point 11 V%
0 – 1.00m
preliminary
Lindenberg Meteorological Observatory – Richard Aßmann Observatory COSMO GM Moscow September 2010
0cm - 9cm
sand
9cm –
27cm
loam
no vegetation
standard drainage
Forcing data taken from Falkenberg 2003