Australian Root Zone Soil Moisture: Assimilation of Remote Sensing Observations 1 Jeffrey Walker , 2 Nadia Ursino, 1 Rodger Grayson and 3 Paul Houser 1. Dept of Civil and Env Engg, University of Melbourne, Australia 2. Dept IMAGE, University of Padova, Italy 3. Hydrological Sciences Branch, NASA-GSFC, USA http://www.civenv.unimelb.edu.au/~jwalker
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Jeffrey Walker Australian Root Zone Soil Moisture: Assimilation of Remote Sensing Observations 1 Jeffrey Walker, 2 Nadia Ursino, 1 Rodger Grayson and 3.
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Jeffrey Walker
Australian Root Zone Soil Moisture: Assimilation of
1. Dept of Civil and Env Engg, University of Melbourne, Australia2. Dept IMAGE, University of Padova, Italy
3. Hydrological Sciences Branch, NASA-GSFC, USA
http://www.civenv.unimelb.edu.au/~jwalker
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The SituationRemote SensingSatellite
Soil MoistureSensors
Logger Soil Moisture Model[q , D ( ), ( )] f s(z)
Stream Gauge
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Catchment Discretisation
• Hydrologic unit is the catchment 50x50 km2
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SMMR Soil Moisture Observations
Owe, de Jeu and Walker, TGRS 2001
79-8779-87
8686
79-8579-85
Rüdiger and Walker
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Assimilation Results
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Soil Moisture DataAdelaide Jan 1948 Dec 1950Alice Springs Oct 1954 Dec 1956Ballarat Jan 1976 Dec 1977Belconnen Jan 1983 Dec 1986Biloela Jan 1948 Dec 1951Borden Oct 1996 Dec 1999Brindabellas Apr 1981 Oct 1983Collie Jan 1974 May 1979Coranderrk Jan 1970 Dec 1978Dooen Jan 1988 Dec 1991Dwellingup (upslope) May 1984 Oct 1986East Beverly Jan 1992 Dec 1994Esperance Valley Nov 1986 Apr 1988Griffith Jan 1981 Dec 1984Hastings Jan 1976 Dec 1980Huon A (1934 regrowth) Jan 1976 Dec 1980Huon B (1966 regrowth) Jan 1976 Dec 1980Huon C (1975 regrowth) Jan 1976 Dec 1980Keith 1 Apr 1956 Mar 1958Keith 2 Apr 1956 Mar 1958Kojonup Jul 1995 Mar 1999Lidsdale Oct 1968 Apr 1971Lockhart Jan 1980 Dec 1983Lockyersleigh Jan 1987 Jul 1990Moura Jan 1986 Dec 1989Mt Gambier (Grass Land) Jan 1960 Dec 1965Mt Gambier (Kalangadoo Sand) Apr 1963 May 1966Mt Gambier (Young Sand) Apr 1963 May 1966Narrabri Sep 1979 Jun 1980Nerrigundah Aug 1997 Oct 1998North Maroondah (Black Spur 1) Jul 1973 Dec 1976Northfield Jan 1963 Dec 1966Old Junee Jan 1992 Jan 1998Parafield Oct 1966 Oct 1968Pingrup Oct 1996 Dec 1999Pinjarra Nov 1965 Nov 1967Point Nepean Sep 1998 Feb 2000Puckapunyal Apr 1981 Jun 1983Rutherglen Sep 1995 Dec 1999Simmonds Marsh Jan 1976 Dec 1980Sorell Jul 1991 Jul 1994Storm Hill Jan 1976 Dec 1980Tarrawarra Sep 1995 Nov 1997Three Springs (upslope) Jan 1984 Dec 1985Townsville Feb 1968 Aug 1968Trangie Jan 1982 Dec 1984Walpeup Jan 1988 Dec 1991Wongan Hills Jul 1996 Dec 1998Yanchep Jan 1982 Dec 1985Yanco Sep 1981 Jun 1984Yarralaw May 1985 Oct 1986
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0 200 400 600 800 1000
Mo
de
l Ch
an
ge
in M
ois
ture
Sto
rag
e (
mm
)
Literature Change in Moisture Storage (mm)
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Gauged Catchments
330 catchments but mostly coastal and/or dense veg
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NDVI Data
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Drought of 1982/83
0.1
0.2
0.3
0.4
0.5
0.6
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
ND
VI (
-)
Soil Moisture (v/v)
ND
VI
(-)
Soil Texture: Wilt Pt
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Anomalies
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Drought of 1982/83
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Temporal Correlation
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Conclusions• Mismatch between model output and available soil
moisture data made it difficult to draw conclusions on improvement in soil moisture predictions.
• Need to make further investigations using the runoff data for low vegetation interior catchments – assumes model has correct dependence on soil moisture.
• An increase in correlation with NDVI data – provides encouragement for pursuing assimilation of AMSR-E data and the collection of appropriate ground-based soil moisture validation data.