Disparity between annualized and seasonalized anthropogenic CO₂ CCSM simulations

• Computations
• CO₂ Concentration Maps
• CO₂ Disparity Maps
• Time series
• Tracers
• Statistics by month

Nov 27, 2009

Model calibration experiments for seasonalizing anthropogenic CO₂. Two CCSM simulations using differing biosphere models (CASA' and CN) were forced with ... where anthropogenic carbon dioxide was prescribed over an annual average. CASA' and CN simulations were contrasted for model discrepancy. These two simulations were also contrasted against two additional simulations for which the amount of anthropogenic carbon dioxide was seasonally varied based according to a harmonic function that accounts for latitude and season. Seasonally varying the contribution of anthropogenic carbon dioxide to component sum of atmospheric carbon dioxide accounts for changing fossil fuel preferences, their consumption, and differential release into the atmosphere by season.

In model results disparity is the difference between annualized simulations, which hold anthropogenic carbon dioxide constant throughout a year, and seasonalized simulations, which vary anthropogenic carbon dioxide emissions according to latitude and season. Discrepancy is the difference between biosphere models (i.e. CASA' and CN).

Computations

Maps illustrating difference in CO₂ concentration of each grid cell (G) between its seasonally adjusted, G_s, and non-seasonally adjusted concentration, G_ns, at each time step is calculated as:

Gs - Gns

(1)

Global mean disparity. The global mean for the molar fraction of CO₂ at each time step from the i^th to the j^th grid cell is calculated as:

(Gi,s - Gi,ns) + (Gi+1,s - Gi+1,ns) + ... + (Gj,s - Gj,ns) j

(2)

CO₂ Concentration Maps

Annualized CASA' 1995-2004	Seasonalized CASA' 1995-2004
Annualized CN 1995-2004	Seasonalized CN 1995-2004

CO₂ Disparity Maps

CASA' Jan. 2004	CASA' Jul. 2004
CN Jan. 2004	CN Jul. 2004

Animated CO₂ Disparity Maps

CASA' 1995-2004	CN 1995-2004
CASA' vs. CN (nonseasonalized) 1995-2004

Time Series

Model Discrepancy in Annualized Simulations of Philadelphia & Rural Western Germany	Model Discrepancy in Seasonalized Simulations of Philadelphia & Rural Western Germany
Disparity & Model Discrepancy for Rural Western Germany	Disparity & Model Discrepancy for Philadelphia
Disparity in vertical CO2 profile between nonseasonalized and seasonalized CASA	Disparity in vertical CO2 profile between nonseasonalized and seasonalized CN
CASA Global CO2 Difference (nonseasonalized - seasonalized)	CN Global CO2 Difference (nonseasonalized - seasonalized)
CASA Global Component CO2 Difference (nonseasonalized - seasonalized)	CN Global Component CO2 Difference (nonseasonalized - seasonalized)
CASA Residuals of Global Mean Annual CO2 extremes	CN Residuals of Global Mean Annual CO2 extremes
CASA' Over- & Under-estimation of CO2	CN Over- & Under-estimation of CO2

Tracers

CO2 Tracers for CASA' and CN
Net Ecosystem Exchange for CASA' biosphere model	Net Ecosystem Exchange for CN biosphere model

CO₂ (PPM) monthly means, mins, maxs, standard deviations for global and Continental US domains (1995-2004)

CASA

Global CASA difference (nonseas.-seas.) for 1995-2004, 81920 records
Month  Min  Max  Mean Std-dev
  1  -14.2   17.5    2.2    1.4
  2  -12.4   15.9    2.1    1.3
  3  -11.3   14.2    2.1    1.0
  4   -9.4   15.1    2.1    0.9
  5   -9.7   15.8    2.2    0.9
  6  -13.3   14.7    2.2    1.0
  7   -9.8   15.8    2.2    1.1
  8  -10.9   14.7    2.1    1.3
  9   -9.7   14.3    2.1    1.1
 10  -10.8   14.3    2.1    1.2
 11  -11.5   18.8    2.0    1.3
 12  -17.1   23.3    2.1    1.4

ConUS CASA difference (nonseas.-seas.) for 1995-2004, 1980 records
Month  Min  Max  Mean Std-dev
  1  -12.7    9.4    1.7    1.9
  2   -5.7    9.2    1.9    1.4
  3   -4.9    8.6    1.9    1.1
  4   -3.6    6.8    2.2    1.0
  5   -5.7    9.2    2.0    1.4
  6   -5.8   10.4    1.9    1.7
  7   -9.8    8.7    1.3    2.2
  8  -10.9    9.0    1.2    2.3
  9   -5.7    7.9    1.6    1.7
 10   -5.9    7.5    1.5    1.4
 11   -6.1    7.8    2.1    1.4
 12   -4.2   10.1    2.0    1.6

CN

Global CN difference (nonseas.-seas.) for 1995-2004, 81920 records
Month  Min  Max  Mean Std-dev
  1   -1.6    0.2   -0.1    0.1
  2   -1.5    0.2   -0.1    0.1
  3   -1.4    0.4   -0.1    0.1
  4   -1.8    0.5   -0.1    0.1
  5   -1.9    1.1   -0.0    0.1
  6   -1.6    1.5   -0.0    0.1
  7   -2.2    1.6    0.0    0.1
  8   -1.8    1.3    0.0    0.1
  9   -2.7    1.2    0.0    0.2
 10   -2.2    0.9    0.0    0.2
 11   -1.9    0.6   -0.0    0.2
 12   -2.4    0.2   -0.1    0.2

ConUS CN difference (nonseas.-seas.) for 1995-2004, 1980 records
Month  Min  Max  Mean Std-dev
  1   -1.6   -0.0   -0.3    0.2
  2   -1.1   -0.0   -0.2    0.1
  3   -1.2    0.3   -0.1    0.1
  4   -1.4    0.5   -0.1    0.1
  5   -1.3    0.7   -0.0    0.2
  6   -1.6    0.6   -0.0    0.2
  7   -1.7    0.6    0.0    0.2
  8   -1.8    1.0    0.1    0.2
  9   -2.1    1.2    0.1    0.3
 10   -2.2    0.8    0.1    0.3
 11   -1.7    0.2   -0.0    0.2
 12   -1.8    0.1   -0.2    0.3

Model Discrepancy between CASA & CN

Global CASA,CN difference for 1995-2004, 81920 records
Month  Min  Max  Mean Std-dev
  1  -49.4  -19.1  -34.7    1.9
  2  -51.5  -17.9  -34.7    1.9
  3  -51.6  -17.0  -34.2    2.0
  4  -51.9  -18.2  -33.8    2.3
  5  -58.3  -19.8  -33.6    2.4
  6  -57.4  -21.2  -34.2    2.0
  7  -56.1  -23.1  -35.4    2.1
  8  -57.1  -22.7  -36.4    2.7
  9  -55.7  -20.6  -36.3    2.4
 10  -51.4  -14.3  -35.6    2.1
 11  -50.5  -16.8  -35.3    2.1
 12  -53.2  -14.9  -35.1    2.2

ConUS CASA,CN difference for 1995-2004, 1980 records
Month  Min  Max  Mean Std-dev
  1  -49.4  -19.1  -34.7    1.9
  1  -40.6  -27.9  -34.7    2.0
  2  -39.8  -27.2  -34.3    1.7
  3  -39.2  -27.3  -33.6    1.5
  4  -39.1  -24.7  -32.6    1.9
  5  -42.4  -25.6  -32.6    2.2
  6  -44.5  -24.9  -33.5    2.4
  7  -47.4  -26.2  -35.5    2.7
  8  -49.5  -25.9  -37.4    3.1
  9  -48.6  -29.7  -38.1    2.7
 10  -45.6  -27.4  -37.4    2.2
 11  -43.1  -28.2  -35.6    2.1
 12  -42.9  -23.6  -35.1    2.5

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