attributing direct radiative forcing to specific emissions using adjoint sensitivities daven k...
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![Page 1: Attributing direct radiative forcing to specific emissions using adjoint sensitivities Daven K Henze, Drew T. Shindell, Robert J. D. Spurr g-con](https://reader036.vdocuments.net/reader036/viewer/2022062516/56649d605503460f94a40703/html5/thumbnails/1.jpg)
Attributing direct radiative forcing to specific emissions using adjoint sensitivities
Daven K Henze, Drew T. Shindell, Robert J. D. Spurr
g-con
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Radiative Forcing Transfer Functions
How to calculate the radiative forcing change for a given change in emissions?
IPCC, 2007
Global contributions to aerosol direct RF
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Radiative Forcing Transfer Functions
How to calculate the radiative forcing change for a given change in emissions?
Using transfer function T:
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Radiative Forcing Transfer Functions
How to calculate the radiative forcing change for a given change in emissions?
Using transfer function T:
Approximate T using adjoint:
Calculated using GC adjoint (Henze et al., 2007 and LIDORT (Spurr, 2002)
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Radiative Forcing Transfer Functions
The % change in radiative forcing per change in BC emission:
note: per change in any BC emission. This shows variationin efficiency of BC emissions forcing.
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Radiative Forcing Transfer Functions
The % change in radiative forcing per change in SO2 emission:
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Applying to MFR 2030 – 2000 inventories
BC, Total SO2, Total
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Applying to MFR 2030 – 2000 inventories
BC, Total SO2, Total
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Applying to CLE 2030 – 2000 inventories
BC, Total SO2, Total
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Applying to CLE 2030 – 2000 inventories
BC, RESALL SO2, RESALL
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Applying to CLE 2030 – 2000 inventories
BC, POWER SO2, POWER
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Validation: BC
CLE 2030 – 2000 perturbation
Looks good
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Validation: SO2
CLE 2030 – 2000 perturbation
Looks OK, but adjoint-approach biased?
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Validation: SO2
10% perturbationsCLE 2030 – 2000 perturbation
Check: does reducing perturbation reduce nonlinearity?
Yes. The adjoint code is accurate.
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Validation: SO2
RF
ESO2E2000 E’2030
|ADJ| > |FD|
E’’2030
|ADJ| < |FD|
Can we anticipate bias?
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Validation: SO2
CLE 2030 – 2000 perturbation
E2030 > E2000 (China, India)
E2030 < E2000 (Europe )
Yes, bias can be anticipated. Also, overall ordering remains the same.
Conclusion: adjoint sensitivities provide a rapid means of exploring the effect of
specific emissions changes on aerosol DRF.
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The end
Thanks to:
Columbia Univ. Earth Institute Fellowship
Drew Shindell, Rob Spurr, Nadine Unger, John Seinfeld
NASA GSFC: NCCS NASA JPL: SCC
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Radiative Transfer Code
Mie Codederivate mode
GC Adj
Weighting functions
Henze et al., 2007
Following Martin et al., 2004, Drury et al., 2008
Radiative Forcing with GEOS-Chem
GEOS-Chem
Mie CodeGrainger et al., 2004
[SIA], [BC], RH, Ddry
Radiative Transfer CodeLIDORT (Spurr, 2002)
TOA upward SW flux
Forward model Sensitivity calculation:
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Radiative Forcing with GEOS-Chem
GEOS-Chem
[SIA], RH8.4 Koch et al. (1999)
11 Chin et al. (2002)
6.5-13.9 Martin et al. (2004)
10.5 current work
Literature
Ddry
N, Dwet
Mie CodeGrainger et al., 2004
(tabulate as )
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Validating Radiative Forcing Sensitivity
ignore
Phase function coefficients for SIA(Dwet)
Dmax
Dmin
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Validating Radiative Forcing Sensitivity
Mie results for extinction at discrete mode diameters:
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Radiative Forcing (forward calculation)
Chemical TransportModel
Mie Code
Aerosol concentrations
optical properties
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Radiative Forcing Sensitivity
LIDORT Spurr, 2002
Jacobian calculation
GEOS-Chem AdjHenze et al., 2007
Mie Derivative
[SIA]*, [BC]*
Grainger et al., 2004
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Radiative Forcing (forward calculation)
Chemical TransportModel
Mie Code
Aerosol concentrations
optical properties
Radiative Transfer Code
TOA upward SW fluxes
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Next Steps
- Validate the transfer functions
- Apply to various emissions perturbations of interest
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Radiative Forcing Sensitivity
Radiative Transfer CodeLIDORT (Spurr 2002)
Jacobian calculation
GEOS-Chem Adj
Mie Derivative
[SIA]*, [BC]*
24 hr1 week
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Radiative Forcing with GEOS-Chem
GEOS-Chem
N, Dwet
Mie CodeGrainger et al., 2004
[SIA], RH [BC]
Ddry
(external mixture)
Radiative Transfer CodeLIDORT (Spurr, 2002)
TOA upward SW flux
Following Martin et al., 2004; Drury et al,. 2008
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Following Martin et al., 2004, Drury et al., 2008
Radiative Forcing with GEOS-Chem
GEOS-Chem
Mie CodeGrainger et al., 2004
[SIA], [BC], RH, Ddry
Radiative Transfer CodeLIDORT (Spurr, 2002)
TOA upward SW flux
Forward model
Radiative Transfer Code
Mie Codederivate mode
GEOS-Chem Adj
Sensitivity calculation
[SIA]*, [BC]*
Weighting functions
Henze et al., 2007
24 hr
1 wk
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Applying to CLE 2030 inventories
note: this takes about 10 seconds
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Applying to MFR 2030 inventories