1 | #!/usr/bin/python |
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2 | |
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3 | import os,sys |
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4 | from netCDF4 import Dataset as netcdf |
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5 | import numpy as np |
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6 | |
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7 | resname='' |
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8 | |
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9 | # input file |
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10 | fcoord='mesh_mask.nc' |
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11 | |
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12 | # output file |
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13 | fflx='initice.nc' |
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14 | |
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15 | print ' creating init ice file ' +fflx |
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16 | |
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17 | # Reading coordinates file |
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18 | nccoord=netcdf(fcoord,'r') |
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19 | nav_lon=nccoord.variables['glamt'][0,:,:] |
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20 | nav_lat=nccoord.variables['gphit'][0,:,:] |
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21 | time_counter=1 |
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22 | LON1= nav_lon.shape[1] |
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23 | LAT1= nav_lon.shape[0] |
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24 | print 'nav_lon.shape[1]' ,nav_lon.shape[1] |
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25 | print 'LON1 ', LON1 |
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26 | print 'LAT1 ', LAT1 |
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27 | |
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28 | # Creating INITICE netcdf file |
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29 | nc=netcdf(fflx,'w') |
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30 | nc.createDimension('y',LAT1) |
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31 | nc.createDimension('x',LON1) |
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32 | nc.createDimension('time_counter',None) # Setting dimension size to 0 or None makes it unlimited. |
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33 | |
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34 | cdflon=nc.createVariable('nav_lon','f',('y','x')) |
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35 | cdflat=nc.createVariable('nav_lat','f',('y','x')) |
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36 | cdftimecounter=nc.createVariable('time_counter','f',('time_counter')) |
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37 | |
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38 | # ati : Fraction of open waters in sea ice - units % |
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39 | # hti : Sea ice thickness - units m |
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40 | # hts : Snow thickness - units m |
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41 | # smi : Sea ice salinity: |
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42 | # tmi : Sea ice internal temperature - units K |
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43 | # tsu : Sea ice surface temperature - units K |
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44 | # |
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45 | # Take constant values from namelist &namiceini of NEMO |
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46 | rn_hti_ini=2.0 |
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47 | rn_hts_ini=0.1 # initial real snow thickness (m) |
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48 | rn_ati_ini=0.99 # initial ice concentration (-) |
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49 | rn_smi_ini=6.3 # initial ice salinity (g/kg) |
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50 | rn_tmi_ini=270. # initial ice/snw temperature (K) |
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51 | rn_tsu_ini=270. # initial sea ice temperature (K) |
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52 | # |
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53 | cdfati=nc.createVariable('ati','f',('time_counter','y','x')) |
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54 | cdfati.units='Percentage' |
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55 | cdfati.long_name='Sea ice concentration' |
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56 | cdfhti=nc.createVariable('hti','f',('time_counter','y','x')) |
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57 | cdfhti.long_name='Sea ice thickness' |
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58 | cdfhti.units='m' |
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59 | cdfhts=nc.createVariable('hts','f',('time_counter','y','x')) |
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60 | cdfhts.long_name='Snow thickness' |
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61 | cdfhts.units='m' |
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62 | cdfsmi=nc.createVariable('smi','f',('time_counter','y','x')) |
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63 | cdfsmi.long_name='Sea ice salinity' |
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64 | cdfsmi.units='pss' |
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65 | cdftmi=nc.createVariable('tmi','f',('time_counter','y','x')) |
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66 | cdftmi.long_name='Sea ice internal temperature' |
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67 | cdftmi.units='Kelvin' |
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68 | cdftsu=nc.createVariable('tsu','f',('time_counter','y','x')) |
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69 | cdftsu.long_name='Sea ice surface temperature' |
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70 | cdftsu.units='Kelvin' |
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71 | |
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72 | cdflon[:,:]=nav_lon[:,:] |
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73 | cdflat[:,:]=nav_lat[:,:] |
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74 | cdftimecounter[0]=1 |
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75 | |
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76 | cdfati[:,:,:]=rn_ati_ini |
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77 | cdfhts[:,:,:]=rn_hts_ini |
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78 | cdfsmi[:,:,:]=rn_smi_ini |
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79 | cdftmi[:,:,:]=rn_tmi_ini |
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80 | cdftsu[:,:,:]=rn_tsu_ini |
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81 | |
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82 | # --- add noise in initial thickness to help nucleation of deformation --- |
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83 | #for y in np.arange(1,1000,1) : |
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84 | # for x in np.arange(1,1000,1) : |
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85 | # cdfhti[:,y,x] = rn_hti_ini+0.02*rn_hti_ini*np.random.uniform(-1,1) |
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86 | cdfhti[:,:,:]=rn_hti_ini |
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87 | |
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88 | nc.close() |
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89 | nccoord.close() |
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90 | |
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91 | #sys.exit() |
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