M. Reuter, EGU, Vienna, Austria, 08.04.2011 Retrieval of atmospheric CO 2 from satellite near-infrared nadir spectra in the frame of ESA’s climate change initiative Retrieval of atmospheric CO 2 from satellite near- infrared nadir spectra in the frame of ESA’s climate change initiative M.Reuter , O.Schneising , M.Buchwitz , J.Heymann, H.Bovensmann, J.P.Burrows Institute of Environmental Physics, University of Bremen, Germany EGU, Vienna, Austria, 08.04.2011
Retrieval of atmospheric CO 2 from satellite near-infrared nadir spectra in the frame of ESA’s climate change initiative M.Reuter , O.Schneising , M.Buchwitz , J.Heymann, H.Bovensmann, J.P.Burrows Institute of Environmental Physics, University of Bremen, Germany. - PowerPoint PPT Presentation
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M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e
Retrieval of atmospheric CO2 from satellite near-infrarednadir spectra in the frame of ESA’s climate change initiative
M.Reuter , O.Schneising , M.Buchwitz , J.Heymann, H.Bovensmann, J.P.BurrowsInstitute of Environmental Physics, University of Bremen, Germany
EGU, Vienna, Austria, 08.04.2011
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e ESA’s GHG-CCI: Aims and Motivation
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e ESA’s GHG-CCI: Road Map
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e Two in-house algorithms
BESD (XCO2) WFMD (XCO2, XCH4)
Inversion Algorithm:Optimal Estimation;
Full Physics
Least-squares;
Light path Proxy
A-priori constraints:
Yes
Constant: CO2(p), aerosol,
cirrus, ...
Per pixel: P, T, H2O, ...
No
(constant atmosphere as
linearization point for RT)
Atmosphere: ECMWF US Standard (sev. H2O)
Aerosols: State vector (APS) Constant; AAI filter (CO2 only)
Clouds:State vector (CWP, CTH);
Filtering: MERIS 1x1 km2
RT cloud free;
Filtering: O2 & PMD (CO2 only)
Fit windows: Merged fit windows Independent fit windows
Radiative Transfer: SCIATRAN on-line SCIATRAN LUT
Speed: Slow (~15 min./pixel) Fast (~2 min./orbit)
Optimized for: Accuracy Compromise accuracy/speed
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e BESD XCO2
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e Validation with TCCON FTS measurements
350km
Park Falls, USA
350km
Bremen, Germany
350km
Darwin, Australia
350km
Lauder, New Zealand
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e Comparison with FTS, CarbonTracker, GOSAT
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e StatisticsNo statistical significant regional biases
Single measurement precision ~2.5ppm
Good agreement of year-to-year increase and seasonal amplitude
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e WFMD XCO2
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e Global increase
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e CO2 uptake by growing vegetation
Mean wind direction
LongitudeWest East
XCO2
XCO2 gradiantapproximately proportional to
net surface flux Fnet
Fnet
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e CO2 uptake by growing vegetation
Overall very good
agreement
Canada: Stronger CO2 uptake ? Russia: Weaker CO2 uptake ?
M. R
eute
r, E
GU
, Vie
nn
a, A
ust
ria,
08.
04.2
011
Ret
rieva
l of a
tmos
pher
ic C
O2
from
sat
ellit
e ne
ar-in
frar
edna
dir
spec
tra
in th
e fr
ame
of E
SA
’s c
limat
e ch
ange
initi
ativ
e
http://www.esa-ghg-cci.org/Intercomparison with other XCO2 algorithms