incorporating geos-chem in carbontracker: model...
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Incorporating GEOS-Chem in CarbonTracker: model developments, transport comparison to TM5,
and tracer conservation
1
Andy Jacobson, University of Colorado Boulder and NOAA Earth System Research Lab Andrew Schuh, Colorado State University Ken Schuldt, University of Colorado Boulder and NOAA Earth System Research Lab
Model Developments • ObsPack diagnostics module for GEOS-Chem
• CarbonTracker CO2 and SF6 passive tracers using HEMCO
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−0.05
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Model minus observed SF6, 2000−2008 mean by site∆
[SF 6
] (pm
ol m
ol−1
)
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TM5 ERA−i 3x2Marine boundary layernon−MBL
90°S 60°S 30°S Eq 30°N 60°N 90°N
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Model minus observed SF6, 2000−2008 mean by site∆
[SF 6
] (pm
ol m
ol−1
)
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TM5 ERA−i 3x2TM5 ERA−i 3x2 with convection fixMarine boundary layernon−MBL
90°S 60°S 30°S Eq 30°N 60°N 90°N
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−0.05
0.00
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Model minus observed SF6, 2000−2008 mean by site∆
[SF 6
] (pm
ol m
ol−1
)
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TM5 ERA−i 3x2TM5 ERA−i 3x2 with convection fixGEOS−Chem 2x2.5 MERRA2Marine boundary layernon−MBL
90°S 60°S 30°S Eq 30°N 60°N 90°N
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Model minus observed SF6, 2000−2008 mean by site∆
[SF 6
] (pm
ol m
ol−1
)
spospo
spohba syo
psa
psa tdf
tdf
crz bhd
cgo
cgo
poc
poceicpoc
nmb
poc poc
smosmo
smo
abp
pocascpoc
sey
bktmkn
pocchrpoc
pocrpb
gmi
poc
kumkum
mlo
mlomlo
poc
ask
poc
midizo
poc
wis
bmwbme
lmp
sgp
azr
uta
nwr
nwr
nwr
thdthd
kzm
bsc
kzd
uum
hun
hpb
oxk
shm
mhd
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llb
cba
bal
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pal
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sumsum
zepalt
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GEOS−Chem 2x2.5 MERRA2Marine boundary layernon−MBL
90°S 60°S 30°S Eq 30°N 60°N 90°N
6
Patra et al. (2011) interhemispheric gradient of SF6
MLO + BWR minus CGO + SPO
This four-site constraint does not tell the whole story. It identifies TM5’s original problem but misses GEOS-Chem’s excess SF6 north of 30°N. GEOS-Chem has offsetting residuals (>0 at BRW, <0 at MLO).
Observations GEOS-Chem
TM5
1992 1994 1996 1998 2000 2002 2004 2006 2008
Patra et al. (2011) TransCom paper on CH4
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2002 2004 2006 2008 2010 2012
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Replicated Patra et al . (2011) IHG of SF6
∆[S
F 6] (
pmol
mol−1
)
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ObservationsTM5 ERA−i 3x2TM5 ERA−i 3x2 with convection fixGEOS−Chem 2x2.5 MERRA2
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GEOS-Chem v11 MERRA 2x2.5
7
−20 −18 −16 −14 −12
log10(emis in kg m−2 s−1)
SF6 fluxes
GCv11 MERRA2 2x2.5: sf6_pfa_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
GCv11 MERRA2 2x2.5, created 27−Apr−2017 12:38
2000 2002 2004 2006 2008 2010 20120
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
GCv11 MERRA2 2x2.5: sf6_thd_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
GCv11 MERRA2 2x2.5, created 27−Apr−2017 12:38
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
GCv11 MERRA2 2x2.5: sf6_hfm_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
GCv11 MERRA2 2x2.5, created 27−Apr−2017 12:38
2000 2001 2002 2003 2004 2005 2006 2007
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
GCv11 MERRA2 2x2.5: sf6_cma_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
GCv11 MERRA2 2x2.5, created 27−Apr−2017 12:38
2005 2006 2007 2008 2009 2010 2011 20120
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA-i 3x2 with convection fix
8
−20 −18 −16 −14 −12
log10(emis in kg m−2 s−1)
SF6 fluxes
TM5 ERA−i (w/ conv fix) 3x2: sf6_pfa_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i w/conv fix 3x2, created 27−Apr−2017 12:38
2000 2002 2004 2006 2008 2010 20120
2000
4000
6000
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (w/ conv fix) 3x2: sf6_thd_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i w/conv fix 3x2, created 27−Apr−2017 12:38
2003 2004 2005 2006 2007 2008 2009 2010 2011 20120
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (w/ conv fix) 3x2: sf6_hfm_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i w/conv fix 3x2, created 27−Apr−2017 12:38
2000 2001 2002 2003 2004 2005 2006 2007
2000
4000
6000
8000●
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (w/ conv fix) 3x2: sf6_cma_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i w/conv fix 3x2, created 27−Apr−2017 12:38
2005 2006 2007 2008 2009 2010 2011 20120
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
9
Mass conservation in GEOS-Chem v11: excellent Sulfur hexafluoride: some issues
Excess of SF6 north of 30˘N, PBL trapping?
Patra et al. (2011) SF6 IHG metric: insufficient
Does not tell the whole story.
“Beta” of ObsPack diagnostics module now available • Allows sampling of observations from towers, flasks, aircraft,
observatories.
• GLOBALVIEW+, NRT, and other observations products published by NOAA and ICOS. WDCGG planning to adopt ObsPack format.
• Currently SF6, CH4, CO2, CO, N2O, H2O, H2, 13CO2, C18OO, 14CO2, 13CH4… other species on request!
TM5 ERA-i 3x2 no convection fix
10
−20 −18 −16 −14 −12
log10(emis in kg m−2 s−1)
SF6 fluxes
TM5 ERA−i (no conv fix) 3x2: sf6_cma_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i (no conv fix) 3x2, created 27−Apr−2017 12:38
2005 2006 2007 2008 20090
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (no conv fix) 3x2: sf6_hfm_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i (no conv fix) 3x2, created 27−Apr−2017 12:38
2000 2001 2002 2003 2004 2005 2006 2007
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (no conv fix) 3x2: sf6_pfa_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i (no conv fix) 3x2, created 27−Apr−2017 12:38
2000 2001 2002 2003 2004 2005 2006 2007 2008 20090
2000
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
TM5 ERA−i (no conv fix) 3x2: sf6_thd_aircraft−pfp_1_allvalid
Altit
ude
(m A
SL)
TM5 ERA−i (no conv fix) 3x2, created 27−Apr−2017 12:38
2003 2004 2005 2006 2007 2008 20090
2000
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−0.3−0.3−0.2−0.2−0.1−0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.3
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