Assimilation of SMOS Observations Into the Catchment Land ...
Development of a European Land Data Assimilation System (ELDAS)
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Transcript of Development of a European Land Data Assimilation System (ELDAS)
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Development of a European Land Data Assimilation System
(ELDAS)Combined
Research/Demonstration project EU 5th framework
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Motivation
• Pilot study, to combine (European) expertise on soil moisture assimilation
• Provide a European contribution to GLDAS research
• Prepare/apply use of satellite data for soil moisture assimilation – MSG: thermal/visible– SMOS: microwave
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Partners
SMHI
CEH Wallingford
ECMWF
Vienna Univ
INM Madrid
KNMI
AlterraWageningen
Univ Bonn
DWD/GPCC
CNRM
Plus User Advisory Board
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Design of assimilation system
precipitation
radiation
evaporation
Soil moisturecorrection scheme
Soil moisturecontent
(sub)surfacerunoff
Observations drivingsoil moisture correction
Synops dataMETEOSAT or
MSG
Land surfaceparameterizationscheme
Boundary layerscheme
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Observations: precipitation
Raw radar data
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Observations: precipitation
Corrected radar data
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Observations: precipitation
Interpolation to ELDAS grid
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Observations: precipitation
Blend with gauge data
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ELDORADO LW & SW Radiation
• Simple data assimilation of METEOSAT TOA products in NWP RT model
• Verified against BSRN & local SW networks
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Impact of forcings
580 585 590 595 600 605August 2000
286
288
290
292
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2m te
mpe
ratu
re [K
]
OBSCTRLEKFNO FORCNO PRECNO RAD
2 7 12 17 22 27August 2000
282
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2m d
ewpo
int
tem
pera
ture
[K
]
OBSCTRLEKFNO FORCNO PRECNO RAD
T
Td
Loobos, NL
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Trial assimilation of surface heating rates
(Murex)
160 180 200 220 240 260 280julian day
15
20
25
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da
ily m
ea
n r
oo
t zo
ne
so
il m
ois
ture
[%]
ObsCtrlEKF assim. T,RH,SHREKF assim. T,RHEKF assim. SHR
Corr. Bias RMS0.94 3.46 2.000.81 0.89 2.440.79 0.97 2.530.94 2.95 1.58
Soil
moi
stur
e
Days when SHR is available (50% data missing, 25% cloudy)
+ observations-- control-- only SHR assimilated-- only T & RH assimilated-- all assimilated
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Assimilation of -wave data (SGP97)
170 175 180 185 190 195julian day
0.2
0.4
0.6
0.8
1.0
evap
orat
ive
frac
tion OBS
CTRL
KFTR
KFTRB
KB
T & RHAll dataTb only
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Validation sites
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Validation sites
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Validation sites• 20yr ‘PILPS’-climatology (driven by ERA40)• 15mnth CTL with obs P & R• 15mnth DA with obs P & R
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Effect of data assimilation
One of dW
Accumulated increment
Change of evaporation
Change of runoff
Change of soil water
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…and for various classes
Classic Mediterranean
Frozen ground Irrigation (?)
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Use of increments to change evaporation
Froze
n g
rou
nd
Classic
Mediterranean
Irri
gati
on
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(Atmospheric) constraint of evaporationClassic Mediterranea
n
Frozen ground
Irrigation (?)
PrecipitationRunoffStorageEvaporation
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Dealing with increments in ERA40 hydrological budget
analysis1. Subtract I from runoff2. If runoff < 0, compensate with dW
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Dealing with increments in ERA40 hydrological budget
analysis1. Subtract I from runoff2. If runoff < 0, compensate with dW
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Wrap up
• Infrastructural developments are involved
• Demo & Validation in progress• Analysis of analyses: fairly
inefficient in terms of changing evaporation– Calls for adjustment of E/W
instead of W
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Final Workshop
• 8-11 nov 2004• ECMWF, Reading