1 / 16

Explicit simulations, Grid cell, 20-100 m

LMDZ Single Column Model + what is it ? + why is it interesting ? + List of 1D cases + how to install and run it ? M-P Lefebvre and LMDZ team. Use of 1D cases. Observation. Test case, field campaign experiment. Evaluation. Explicit simulations, Grid cell, 20-100 m.

tameka
Download Presentation

Explicit simulations, Grid cell, 20-100 m

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. LMDZ Single Column Model + what is it ? + why is it interesting ? + List of 1D cases + how to install and run it ?M-P Lefebvre and LMDZ team

  2. Use of 1D cases Observation Test case, field campaign experiment Evaluation Explicit simulations, Grid cell, 20-100 m « Large scale » conditions imposed Evaluation Climate model, parameterizations, « single-column » mode Courtesy F.Hourdin → Parameterizations are evaluated against other models → Can be done for realistic test cases but also with more idealized forcing (check the response of the parameterization to perturbations)

  3. 3D is a collection of many “single column models”, covering earth and interaction with each other through a set of rules known as “large scale dynamics”. In a 1D model, there is no dynamics. We use observations or model output or idealized forcing to impose forcing at the boundary of the column.

  4. LMDZ model in 1D mode - We impose large scale conditions. - Duration of the case varies from few hours to few months - We study parameterizations in a given environment. z~20km Δz = 30m - 1km T (K) Q (g/kg) Large scale forcings (constant or not): Temperature, humidity, Wind advection Surface conditions: Surface fluxes or Surface temperature Δx = 50-300 km Initial conditions: Temperature, humidity, wind profils

  5. Why use SCMs ? + simplicity: technical and understanding, usable on any labtop + it's a useful tool for parameterization development: shallow convection, deep convection, transition from stratocumulus to cumulus, stable boundary layer, radiation... + we can compare results to observations or to explicit simulations (CRM, LES) + then we go back to GCM and test new parameterizations ... + hierarchy of models: SCM, CRM, AGCM, GCM ...

  6. shallow convection • Arm_cu (diurnal cycle of shallow cumulus over land) • Rico (shallow precipitating cumulus over sea) • Ayotte (convective boundary layer ) Arm_cu case - Cloud fraction

  7. Stratocumulus and transition to cumulus • Sandu (transition case with 3 options according to variation of SST) • Fire (diurnal cycle of stratocumulus) Fire case: Cloud fraction (%) Top: standard version Bad representation because not Enough entrainment at the cloud top Bottom: version developped by A.Jam

  8. Deep convection: Over ocean: • Toga • case_e (part of Toga) • TWPICE TWPICE Case Vertical speed (m/s) Precipitation (mm/j)

  9. LES LMDZ_AR4_L39 AMMA case: Thetal tendencies due to all schemes (K/j) Deep convection: Over land: • Hapex • AMMA • Idealized case: eq_rad_conv (RCE) LMDZ_NP_L70

  10. How to proceed ? + install LMDZ 3D with install.sh + install LMDZ 1D with instal1d.sh. * this script adds some routines specific to 1D * creates phy1D directory * compiles * runs 3 cases (toga, twpice, arm_cu) and show cloud cover plot

  11. drwxr-xr-x 13 mpllmd lmdjus 4096 Nov 29 17:18 .drwxr-xr-x 10 mpllmd lmdjus 4096 Nov 29 19:32 ..drwxr-xr-x 3 mpllmd lmdjus 4096 Nov 21 16:30 bibiodrwxr-xr-x 3 mpllmd lmdjus 4096 Nov 21 16:30 cosp-rw-r--r-- 1 mpllmd lmdjus 888775 Nov 29 19:29 create_make_gcm.log-rw-r--r-- 1 mpllmd lmdjus 67587 Nov 29 19:27 create_makeg_gcm.logdrwxr-xr-x 3 mpllmd lmdjus 8192 Nov 21 16:30 dyn3ddrwxr-xr-x 3 mpllmd lmdjus 8192 Nov 21 16:30 dyn3dmemdrwxr-xr-x 3 mpllmd lmdjus 8192 Nov 21 16:30 dyn3dpardrwxr-xr-x 3 mpllmd lmdjus 4096 Nov 21 16:30 filtrezdrwxr-xr-x 4 mpllmd lmdjus 97 Nov 29 19:32 griddrwxr-xr-x 4 mpllmd lmdjus 12288 Nov 29 19:23 phy1ddrwxr-xr-x 3 mpllmd lmdjus 4096 Nov 21 16:30 phydevdrwxr-xr-x 4 mpllmd lmdjus 8192 Nov 21 16:30 phylmddrwxr-xr-x 6 mpllmd lmdjus 92 Nov 21 16:30 .svn Some changes ... in ~/LMDZ20131121.trunk/modipsl/modeles/LMDZ5/libf = phylmd + 1D specific routines In phy1d, you can modify the code

  12. Some changes also ...in ~/LMDZ20131121.trunk/1dcases drwxr-xr-- 8 mpllmd lmdjus 4096 Dec 3 10:28 amma drwxr-xr-x 4 mpllmd lmdjus 4096 Dec 3 10:50 arm_cu drwxr-xr-x 5 mpllmd lmdjus 4096 Dec 3 11:55 ayotte drwxr-xr-x 3 mpllmd lmdjus 4096 Dec 3 12:12 case_e drwxr-xr-x 3 mpllmd lmdjus 4096 Dec 3 12:14 eq_rd_cv drwxr-xr-x 5 mpllmd lmdjus 4096 Nov 29 19:29 fire drwxr-xr-x 3 mpllmd lmdjus 4096 Nov 29 19:29 hapex92_init drwxr-xr-x 4 mpllmd lmdjus 4096 Nov 29 19:29 rico drwxr-xr-- 5 mpllmd lmdjus 4096 Nov 29 19:29 sandufast drwxr-xr-- 5 mpllmd lmdjus 4096 Nov 29 19:29 sanduref drwxr-xr-- 5 mpllmd lmdjus 4096 Nov 29 19:29 sanduslow drwxr-xr-x 5 mpllmd lmdjus 4096 Nov 29 19:30 toga drwxr-xr-x 4 mpllmd lmdjus 4096 Nov 29 19:31 twpice Here, you can compile the model and run your favorite case

  13. What can you do in each case directory ? + compile with compile.x: choose level number + profils and forcings (ascii files or netcdf files) + def files + readme + execute with xqt.x or mr file + get results in netcdf files (histhf.nc) + compare to LES results in resul_LES

  14. In LMD, we used these cases to develop New Physics version. For 2 cases, Arm_cu and Rico, we compare results of « standard physics » (CMIP3), « new physics » (CMIP5) and LES model. Shade= cloud cover Contour= specific humidity (g/kg)

  15. Rico case : Sensitivity Tests to vertical discretization and time step

  16. Thank you !

More Related