development of a european land data assimilation system (eldas)
DESCRIPTION
Development of a European Land Data Assimilation System (ELDAS). Combined Research/Demonstration project EU 5th framework. Motivation. Pilot study, to combine ( European ) expertise on soil moisture assimilation Provide a European contribution to GLDAS research - PowerPoint PPT PresentationTRANSCRIPT
Development of a European Land Data Assimilation System
(ELDAS)Combined
Research/Demonstration project EU 5th framework
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
Partners
SMHI
CEH Wallingford
ECMWF
Vienna Univ
INM Madrid
KNMI
AlterraWageningen
Univ Bonn
DWD/GPCC
CNRM
Plus User Advisory Board
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
Observations: precipitation
Raw radar data
Observations: precipitation
Corrected radar data
Observations: precipitation
Interpolation to ELDAS grid
Observations: precipitation
Blend with gauge data
ELDORADO LW & SW Radiation
• Simple data assimilation of METEOSAT TOA products in NWP RT model
• Verified against BSRN & local SW networks
Impact of forcings
580 585 590 595 600 605August 2000
286
288
290
292
294
296
2m te
mpe
ratu
re [K
]
OBSCTRLEKFNO FORCNO PRECNO RAD
2 7 12 17 22 27August 2000
282
284
286
288
290
2m d
ewpo
int
tem
pera
ture
[K
]
OBSCTRLEKFNO FORCNO PRECNO RAD
T
Td
Loobos, NL
Trial assimilation of surface heating rates
(Murex)
160 180 200 220 240 260 280julian day
15
20
25
30
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
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
Validation sites
Validation sites
Validation sites• 20yr ‘PILPS’-climatology (driven by ERA40)• 15mnth CTL with obs P & R• 15mnth DA with obs P & R
Effect of data assimilation
One of dW
Accumulated increment
Change of evaporation
Change of runoff
Change of soil water
…and for various classes
Classic Mediterranean
Frozen ground Irrigation (?)
Use of increments to change evaporation
Froze
n g
rou
nd
Classic
Mediterranean
Irri
gati
on
(Atmospheric) constraint of evaporationClassic Mediterranea
n
Frozen ground
Irrigation (?)
PrecipitationRunoffStorageEvaporation
Dealing with increments in ERA40 hydrological budget
analysis1. Subtract I from runoff2. If runoff < 0, compensate with dW
Dealing with increments in ERA40 hydrological budget
analysis1. Subtract I from runoff2. If runoff < 0, compensate with dW
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
Final Workshop
• 8-11 nov 2004• ECMWF, Reading