Changes between Version 19 and Version 20 of DevelopmentActivities/CMIP6/DevelopmentsCMIP6/zo_evaporation


Ignore:
Timestamp:
2016-06-08T13:41:32+02:00 (8 years ago)
Author:
nvuilsce
Comment:

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  • DevelopmentActivities/CMIP6/DevelopmentsCMIP6/zo_evaporation

    v19 v20  
    175175Some authors have proposed formulations of z0 which vary with the LAI as it is roughly done for herbaceous PFTs into ORCHIDEE. For instance, [attachment:su_2001.pdf Su et al. (2001)] developed such formulation which has been used and tested recently at fluxnet sites by [attachment:ershadietal2015.pdf Ershadi et al. (2015)]. The formulation of Su et al., 2001 has been implemented into ORCHIDEE. Inclusion the Su formula for z0 leads to reduce/cancel the bias on latent heat flux at winter for deciduous forest (TeDBF pfts). Results obtained with this formulation are shown below: 
    176176 
    177 ||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_BoENF/lh_month_20818/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_CROc3/lh_month_25383/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_CROc4/lh_month_3329/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_GRAc3/lh_month_7772/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeDBF/lh_month_15133/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeEBF/lh_month_27651/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeENF/lh_month_21186/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TrEBF/lh_month_19904/lh_month.gif,100%)]]|| 
     177||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_BoENF/lh_month_20818/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_CROc3/lh_month_25383/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_CROc4/lh_month_3329/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_GRAc3/lh_month_7772/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeDBF/lh_month_15133/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeEBF/lh_month_27651/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TeENF/lh_month_21186/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/fluxnet_taylor_diff_Rough-Su-r3197_Rough-ctrl-r3197_TrEBF/lh_month_19904/lh_month.gif,100%)]]|| 
    178178 
    179179Here below is the mean seasonal fluxes averaged for all the sites per Biome (=PFT): in black are the observations, in green the standard ORCHIDEE and in red, the version with the formula of Su et al. (2001). 
    180180 
    181 [[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-Su-r3197/seasonal_view_Rough-ctrl-r3197_Rough-Su-r3197.png,50%)]] 
     181[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-Su-r3197/seasonal_view_Rough-ctrl-r3197_Rough-Su-r3197.png,50%)]] 
    182182 
    183183=== The "z0h=z0m/10" formulation === 
    184184In the formulation of Su and many others, one distinguishes for the roughness length for heat (z0h) and for momentum (z0m). Fuxing has studied in coupled mode how accounting for both z0m and z0h in the formulation of the drag coefficient impacts on the surface fluxes and properties (temperature). Here we look at the impact on force in-situ simulations of accounting for the formula where z0h=z0m/10. 
    185185 
    186 ||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_BoENF/lh_month_29372/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_CROc3/lh_month_16611/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_CROc4/lh_month_8621/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_GRAc3/lh_month_27165/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeDBF/lh_month_22779/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeEBF/lh_month_15465/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeENF/lh_month_20418/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TrEBF/lh_month_28661/lh_month.gif,100%)]]|| 
     186||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_BoENF/lh_month_29372/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_CROc3/lh_month_16611/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_CROc4/lh_month_8621/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_GRAc3/lh_month_27165/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeDBF/lh_month_22779/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeEBF/lh_month_15465/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TeENF/lh_month_20418/lh_month.gif,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/fluxnet_taylor_diff_Rough-z0h-r3197_Rough-ctrl-r3197_TrEBF/lh_month_28661/lh_month.gif,100%)]]|| 
    187187 
    188188Here below is the mean seasonal fluxes averaged for all the sites per Biome (=PFT): in black are the observations, in green the standard ORCHIDEE and in red, the version with the formula "z0h=z0m/10". 
    189189 
    190 [[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Rough-z0h-r3197/seasonal_view_Rough-ctrl-r3197_Rough-z0h-r3197.png,50%)]] 
     190[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Local/Rough-z0h-r3197/seasonal_view_Rough-ctrl-r3197_Rough-z0h-r3197.png,50%)]] 
    191191 
    192192=== Global off-line simulations === 
    193193Global simulations with the 2 formulations have been performed. Synthesis of these 2 simulations is available: 
    194 for the Su formulation (compared to the ctrl (=standard ORCHIDEE): http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/ 
    195 for the z0h formulation (compared to the ctrl) : http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.rz0h/ 
     194for the Su formulation (compared to the ctrl (=standard ORCHIDEE): http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/ 
     195for the z0h formulation (compared to the ctrl) : http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.rz0h/ 
    196196 
    197197Here below are few diagnostics specificly for the latent heat flux for the Su formulation: 
    198 ||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/LH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/LH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/LH_std_SUM_.jpg,100%)]]|| 
     198||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/LH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/LH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/LH_std_SUM_.jpg,100%)]]|| 
    199199 
    200200And here the same diagnostics for the "z0h=z0m/10" formulation 
    201 ||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.rz0h/images/LH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.rz0h/images/LH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.rz0h/images/LH_std_SUM_.jpg,100%)]]|| 
     201||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.rz0h/images/LH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.rz0h/images/LH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.rz0h/images/LH_std_SUM_.jpg,100%)]]|| 
    202202 
    203203Impact of the Su formulation on the Sensible Heat flux is significant in the global simulations while this was not the case in the in-situ simulations (see below). This might be related to the average of z0h and z0m over the different PFT fractions within each grid cell.  
    204 ||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/SH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/SH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/ATLAS_OBS_RDYN3202.su/images/SH_std_SUM_.jpg,100%)]]|| 
     204||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/SH_correl_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/SH_mean_SUM_.jpg,100%)]]||[[Image(http://dods.extra.cea.fr/work/p529vui/OL2/DEVT/Eval-ORCHIDEE/Roughness/Forced_Global/3202/ATLAS_OBS_RDYN3202.su/images/SH_std_SUM_.jpg,100%)]]|| 
    205205 
    206206=== Comment on the averaging of z0 over tiles (N. Vuichard, 21/03/2016) ===