search

lma6 / GlobalED

0 stars 0 forks source link

Add evaporation estimation #2

Open lma6 opened 6 years ago

lma6 commented 6 years ago

Current ED module could not estimate evaporation from canopy and soil in default settings as there is a parameter called soil evaporation conductivity is zero

lma6 commented 6 years ago

One solution to this issue is to give value to soil evaporation conductivity parameters. As no paper found as the reference for the values, 10 or 20 could be the first try.

During the test, the other parameters like PFT vcmax should not change, to check whether the non-zero value would decrease gpp output but increase ET.

lma6 commented 6 years ago

test 1, change soil_evap_conductivity to 10, the result is saved in GlobalPot1k_FAST_FARCP_woAccm3_LU_sec10

Assigning a value to this parameter could increase ET but reduce vegetation productivity for some regions. Besides, the seasonal pattern of ET is not agreed with reference. In winter, there is still strong evaporation which is not realistic. To solve this, introduce month varying parameters or advanced energy budget equations.