a lagrangian particle dispersion model approach for ... · lagrangian particle dispersion modeling....
TRANSCRIPT
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A Lagrangian Particle Dispersion Model Approach for Evaluating CarbonTracker
A. Andrews1, A. Hirsch2, A. Michalak3, C. Sweeney2, S. Wofsy4, J. Eluszkiewicz5, T. Nehrkorn5, A. Jacobson2 , K. Masarie1, W. Peters2,6, K. Croasdale7, P. Tans1
1NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 803052Cooperative Institute for Research in Environmental Sciences, University of Colorado,
Boulder, CO 80309 3 Department of Civil and Environmental Engineering, and Department of Atmospheric,
Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 481094Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 021385Atmospheric and Environmental Research, Inc., Lexington, MA 02421
6Wageningen University and Research Center, Wageningen, 6708 PB, the Netherlands7Department of Environmental Sciences, University of Illinois, Springfield, IL 62703
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http://carbontracker.noaa.gov
CarbonTracker Overview
Optimization step is Ensemble Kalman Filter
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http://carbontracker.noaa.gov
Mechanics Optimized
SpecifiedFIRES= GFED2
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http://carbontracker.noaa.gov
Mechanics Optimized
SpecifiedFIRES= GFED2
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Sensitivity = 0Sensitivity > 0
PBL height
Sensitivity = 0Sensitivity > 0
PBL height
Time (hours)
Alti
tude
(m)
Footprint[ppm per unit flux]
CarbonTracker
Initial Condition(CarbonTracker)
∑∑= =
+=N
p
t
t
BCmeasf
FLUXSENSN
COCO0 0
22 *1
Sampling FootprintsLagrangian Particle Dispersion Modeling
Stochastic Time Inverted Lagrangian Transport Model
-24 hours-48 hours-72 hours-96 hours
-120 hours
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Sensitivity = 0Sensitivity > 0
PBL height
Sensitivity = 0Sensitivity > 0
PBL height
Time (hours)
Alti
tude
(m)
Footprint[ppm per unit flux]
CarbonTracker
Initial Condition(CarbonTracker)
∑∑= =
+=N
p
t
t
BCmeasf
FLUXSENSN
COCO0 0
22 *1
Sampling FootprintsLagrangian Particle Dispersion Modeling
Stochastic Time Inverted Lagrangian Transport Model
-24 hours-48 hours-72 hours-96 hours
-120 hours
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Normalized Footprint: Linear Color ScaleComposite: MAY-JULY 2004 LEF, 19GMT
Note: Footprints are time-resolved, but shown as 10-day composite
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Normalized Footprint: Log10 Color ScaleComposite: MAY-JULY 2004 LEF, 19GMT
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0-0.10.1-0.20.2-0.30.3-0.40.4-0.50.5-0.60.6-0.70.7 -0.9 Cumulative Surface Sensitivity
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0-0.10.1-0.20.2-0.30.3-0.40.4-0.50.5-0.60.6-0.70.7 -1.0
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Frac
tion
of P
artic
les
-10 -8 -6 -4 -2 0Days
<2km<1km< Model Mixed Layer Height
STILT BOUNDARY LAYER RESIDENCE TIME
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OBSCT
LEF TOWER: PARK FALLS, WI396 magl
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OBSCT
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OBSCT
STILT-WRF-CT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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COBRA 2004(Harvard)
MLO
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OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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CT R2 =0.87
STILT R2=0.89
OBSERVED CO2 , ppm
MO
DEL
ED C
O2,
ppm
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AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
+ COBRA 2004(HARVARD)
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OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
CT R2 =0.56 (0.67)
STILT R2=0.29 (0.65)
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AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
JULY 18, 19:00 GMT
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AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
JULY 19, 19:00 GMT
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AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
AMT: JUNE-JULY 2004 19:00 GMT (TOWER)
OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
JUly 25, 19:00 GMT
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COBRA-MAINE: HARVARD UNIVERSITY/NSF & NOAA7 MAY – 16 AUGUST 200433 FLIGHTSWyoming King AirNSF paid for equipment & establishing AMT tower site under this project
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COBRA: 2004-07-30AMT OVERFLIGHT
+ +
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+
COBRA: 2004-07-30300m agl
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COBRA: 2004-07-303200m agl
+Free troposphere has much smaller surface sensitivity than boundary layer
strongly driven by initial condition.
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July/Aug 2004OBS STILT-WRF-CTCT interp
May/Jun 2004OBSSTILT-WRF-CTCT interp
Alti
tude
, m a
bove
gro
und
leve
l
Carbon Dioxide, ppm360 365 370 375 380 385
010
0020
0030
0040
00
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July/Aug 2004OBS STILT-WRF-CTCT interp
May/Jun 2004OBSSTILT-WRF-CTCT interp
Alti
tude
, m a
bove
gro
und
leve
l
Carbon Dioxide, ppm360 365 370 375 380 385
010
0020
0030
0040
00
More/Earlier drawdown needed in Spring?
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July/Aug 2004OBS STILT-WRF-CTCT interp
May/Jun 2004OBSSTILT-WRF-CTCT interp
Alti
tude
, m a
bove
gro
und
leve
l
Carbon Dioxide, ppm360 365 370 375 380 385
010
0020
0030
0040
00
•Differences are due to model transport.•Keep in mind that fluxes have been optimized using CT.•Aircraft data were not optimized.
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Summary Points
•Lagrangian models can provide insight into the mechanics of CarbonTracker
•Diagnose patterns and residuals
•Footprint information can inform decisions about how to weight different types of data
•Generally good agreement between STILT-WRF-CT and CarbonTracker is encouraging—STILT tends to predict lower CO2 near the surface
•“Campaign” data are valuable independent datasets for CarbonTracker evaluation: e.g, COBRA-2003, COBRA-2004, TEXAS AQS 2006, ARCPAC- 2008, START-08, HIPPO
•Footprints are generic and can be used to interpret mixing ratio measurements of other species (halocarbons, COS, isotopes, etc.)
•Other LPDMS are in use around ESRL: FLEXPART, CSU LPDM, HYSPLIT
•We are working toward building an archive of footprints that can be linked to the GMD database
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OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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OBSCT
STILT
CT ~4KMAC OBS >3.5 KM
STILT-BKGRD
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CT R2 =0.64 (0.87)
STILT R2=0.65 (0.85)
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