ORCHIDEE Development Section

ORCHIDEE response to CO2 rise
(1% increase per year after 2017)

Old formula : \( \mathsf{Vcmax} = \mathsf{Vcmax25} \cdot (1 - \mathsf{coef\_down\_reg} \cdot \log(\mathsf{CO2} / 380) ) \)

New formula : \( \mathsf{Vcmax} = \mathsf{Vcmax25} \cdot (1 - \mathsf{coef\_down\_reg} \cdot (\mathsf{CO2}-380) / (\mathsf{CO2}+\mathsf{coef\_curve}) ) \)

PFT PFT2 PFT3 PFT4 PFT5 PFT6 PFT7 PFT8 PFT9 PFT10 PFT11 PFT12 PFT13 PFT14 PFT15
Vcmax 45 45 35 40 50 45 35 35 50 50 60 60 50 50
OLD coef_down_reg 0.38 0.38 0.28 0.28 0.28 0.22 0.22 0.22 0.26 0.03 0.26 0.03 0.26 0.26
NEW0 coef_down_reg 0.35 0.35 0.26 0.26 0.26 0.20 0.20 0.20 0.24 0.03 0.24 0.03 0.24 0.24
NEW0 coef_curve 20 20 20 20 20 20 20 20 20 20 20 20 20 20
NEW1 coef_down_reg 0.44 0.44 0.32 0.32 0.32 0.25 0.25 0.25 0.30 0.03 0.30 0.03 0.30 0.30
NEW1 coef_curve 96 96 96 96 96 96 96 96 96 96 96 96 96 96
NEW2 coef_down_reg 0.68 0.68 0.50 0.50 0.50 0.39 0.39 0.39 0.46 0.05 0.46 0.05 0.46 0.46
NEW2 coef_curve 305 305 305 305 305 305 305 305 305 305 305 305 305 305


BR-Sa3 (lat : -3.018, lon : -54.971)
PFT2
Forcing : 2000-2003
ID-Pag (lat : 2.345, lon : 114.036)
PFT2
Forcing : 2002-2003
FR-LBr (lat : 44.717, lon : -0.769)
PFT4
Forcing : 1996-2006
AU-Tum (lat : -35.656, lon : 148.152)
PFT5
Forcing : 2001-2006
FR-Hes (lat : 48.674, lon : 7.065)
PFT6
Forcing : 1997-2006
CA-Qfo (lat : 49.693, lon : -74.342)
PFT7
Forcing : 2003-2006
DE-Meh (lat : 51.275, lon : 10.656)
PFT10
Forcing : 2003-2006
FR-Gri (lat : 48.844, lon : 1.952)
PFT12
Forcing : 2005-2006
US-Bo1 (lat : 40.006, lon : -88.290)
PFT13
Forcing : 1996-2007
US-Bkg (lat : 44.345, lon : -96.836)
PFT15
Forcing : 2004-2006

Site Forcing year Simulation year / CO2 NPP [kgC/m2/y]
no downreg
NPP [kgC/m2/y]
old
NPP [kgC/m2/y]
new0
NPP [kgC/m2/y]
new1
NPP [kgC/m2/y]
new2
GPP [kgC/m2/y]
no downreg
GPP [kgC/m2/y]
old
GPP [kgC/m2/y]
new0
GPP [kgC/m2/y]
new1
GPP [kgC/m2/y]
new2
BR-Sa3 2000 2000 / 368.23
2076 / 727.45
1.06
1.36
(29%)
1.06
1.15
(8%)
1.06
1.21
(14%)
1.06
1.18
(11%)
1.06
1.16
(8.9%)
2.89
3.98
(38%)
2.91
3.47
(19%)
2.91
3.63
(25%)
2.91
3.58
(23%)
2.91
3.51
(20%)
ID-Pag 2002 2002 / 371.93
2078 / 742.07
0.733
1.27
(73%)
0.737
1.04
(41%)
0.736
1.12
(53%)
0.736
1.1
(50%)
0.737
1.06
(43%)
2.63
4.11
(56%)
2.65
3.5
(32%)
2.65
3.73
(41%)
2.65
3.67
(39%)
2.65
3.55
(34%)
FR-LBr 1996 1996 / 361.2
2073 / 706.06
0.59
0.929
(57%)
0.602
0.713
(18%)
0.601
0.771
(28%)
0.601
0.755
(26%)
0.602
0.725
(21%)
1.51
2.26
(49%)
1.54
1.85
(20%)
1.53
1.96
(28%)
1.53
1.93
(26%)
1.54
1.87
(22%)
AU-Tum 2001 2001 / 369.79
2079 / 749.49
0.662
0.86
(30%)
0.664
0.702
(5.7%)
0.664
0.758
(14%)
0.664
0.745
(12%)
0.664
0.715
(7.7%)
1.57
2.01
(28%)
1.58
1.69
(6.7%)
1.58
1.8
(14%)
1.58
1.77
(12%)
1.58
1.71
(8.3%)
FR-Hes 1997 1997 / 362.51
2077 / 734.73
0.823
1.09
(32%)
0.831
0.944
(14%)
0.829
0.997
(20%)
0.83
0.985
(19%)
0.831
0.956
(15%)
1.54
1.99
(29%)
1.56
1.75
(13%)
1.55
1.84
(18%)
1.55
1.82
(17%)
1.56
1.77
(14%)
CA-Qfo 2003 2003 / 374.39
2079 / 749.49
0.303
0.47
(55%)
0.351
0.4
(14%)
0.351
0.426
(21%)
0.351
0.42
(20%)
0.352
0.407
(16%)
0.919
1.27
(38%)
1
1.11
(11%)
1
1.17
(17%)
1
1.16
(16%)
1
1.13
(13%)
DE-Meh 2003 2003 / 374.39
2079 / 749.49
0.304
0.633
(1.1e+02%)
0.312
0.539
(73%)
0.313
0.575
(84%)
0.312
0.567
(82%)
0.312
0.551
(76%)
0.575
1.1
(91%)
0.588
0.956
(63%)
0.589
1.01
(71%)
0.588
0.998
(70%)
0.588
0.973
(66%)
FR-Gri 2005 2005 / 378.23
2079 / 749.49
0.65
1.26
(94%)
0.643
1.09
(70%)
0.643
1.15
(79%)
0.643
1.14
(77%)
0.643
1.11
(72%)
1.17
2.15
(84%)
1.17
1.89
(62%)
1.17
1.98
(70%)
1.17
1.96
(68%)
1.17
1.91
(64%)
US-Bo1 1996 1996 / 361.2
2080 / 756.99
1.04
1.12
(7.2%)
1.04
1.1
(5.6%)
1.04
1.11
(6.2%)
1.04
1.11
(6.2%)
1.04
1.1
(5.8%)
1.72
1.83
(6.3%)
1.72
1.81
(4.9%)
1.72
1.82
(5.4%)
1.72
1.82
(5.4%)
1.72
1.81
(5%)
US-Bkg 2004 2004 / 376.12
2079 / 749.49
0.238
0.392
(65%)
0.239
0.314
(32%)
0.239
0.341
(43%)
0.239
0.334
(40%)
0.239
0.321
(35%)
0.567
0.852
(50%)
0.568
0.713
(25%)
0.568
0.762
(34%)
0.568
0.749
(32%)
0.568
0.727
(28%)