Check global and regional GPP

[luyssaert]

Check: (1) the global GPP after an analytical spinup, transient simulation and FG2. The global GPP should be between 100 and 150 Pg C y-1; (2) the regional distribution (as defined in the mapper). It should be in line with tag 2.1.; (3) time series of LAI should be screened (LAI script); and (4) spatial patterns of the LAI time series should be screened (visual).

Notes for check 4:
In r6826 MTC4 grows well along the Pacific West Coast which is a hotspot for the MTC but it grows poorly in the Rocky Mountains. Too much water stress?

[luyssaert]

• PFT 2 and 3: GPP in the tropical core should go up to 4000 gC y-1 for both tropical forest PFTs. Current extreme values just approach 3000 gC y-1. See ​figure

Proposed changes:

• PFT 6: Temperate deciduous trees should have a GPP going up to 1500 gC y-1 in central Europe. Current extreme values just approach 1100 gC y-1. See ​figure

Proposed changes:

• PFT 7: Boreal eevrgreen trees should have a GPP going up to 1100 gC y-1 in southern Scandinavia. Current values in that region are below 700 gC y-1. See ​figure

Proposed changes:

• PFT 8 and 9: cannot sustain their LAI and die continuously from low productivity. See ​figure. See also ticket #677.

Proposed changes: double k_latosa, reduce psi_leaf to -3

• PFT 10: C3 temperate grasslands should have a GPP going up to 1500 gC y-1 in central Europe. Current values in that region are below approach 800 gC y-1. See ​figure

Proposed changes:

• PFT 12: C3 temperate croplands should have a GPP going up to 1500 gC y-1 in central Europe. Current values in that region are around 1100 gC y-1. See ​figure

Proposed changes:

• PFT 14: Tropical C3 grasslands grow in drier regions. What is an acceptable GPP? Current simulations are below 700 gC y-1. See ​figure

Proposed changes: