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SIMIP_ice_mass_budget_calculate_CESM.py
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SIMIP_ice_mass_budget_calculate_CESM.py
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#--------------------------------------------------------------------
# Example script to demonstrate how to create ice mass budget ASCII files
# from standard monthly-mean SIMIP diaganostics
# including applying the mask, area weigting, and summation
#
# Ed Blockley, Feb 2019
#--------------------------------------------------------------------
import numpy as np
import glob
import datetime as dt
import xarray as xr
import cftime
import os
#--------------------------------------------------------------------
# define and count input files
# NB specific to our file naming
datafile='NCAR_CESM2f09g17_BL99_001_ice.txt'
case = 'b.e21.B1850.f09_g17.CMIP6-piControl.001_bl99snow1'
case2 = 'b.e21.B1850.f09_g17.CMIP6-piControl.001_snow1'
path = '/glade/p/cesm/pcwg/dbailey/archive/'
fileGlob = path+case+'/ice/proc/tseries/month_1/*sidmasslat*.nc'
files = glob.glob(fileGlob)
# derive dates from time_bounds array
ds = xr.open_mfdataset(files,combine='by_coords')
times = ds.time_bounds.values
print(times)
leftbounds_yr = [x[0].timetuple()[0] for x in times]
leftbounds_mo = [x[0].timetuple()[1] for x in times]
#--------------------------------------------------------------------
# define sea ice budget variables
budgetVars = [
'sidmassgrowthbot',
'sidmassgrowthwat',
'sidmassmelttop',
'sidmassmeltbot',
'sidmasslat',
'sidmasssi',
'sidmassevapsubl',
'sidmassdyn',
'total'
]
#--------------------------------------------------------------------
# read in static fields: mask and grid-cell-areas
#
# mask
fh = xr.open_dataset('arctic_region_mask_gx1v7.nc')
masktmp = fh['mask']
fh.close()
mask = masktmp.rename({'ncl0': 'nj','ncl1': 'ni'})
# areas
maskFile = '/glade/p/cesm/omwg/grids/gx1v7_grid.nc'
fh = xr.open_dataset(maskFile)
tareatmp = fh['TAREA']
tlat = fh['TLAT']
fh.close()
tarea = tareatmp.rename({'nlon': 'ni','nlat': 'nj'})
tarea = tarea*1.0e-4
#--------------------------------------------------------------------
# define output file and populate header
#
# define formats
title_format = "%1s %4s %6s %14s %12s %17s %17s %15s %15s %12s %12s %15s %12s %12s"
data_format = "%6i %6i %14.5e %12.5e %17.5e %17.5e %15.5e %15.5e %12.5e %12.5e %15.5e %12.5e %12.5e"
headers = ('#','Year','Month','Area (Km**2)', 'Mass (Kg)',
'sidmassgrowthbot',
'sidmassgrowthwat',
'sidmassmelttop',
'sidmassmeltbot',
'sidmasslat',
'sidmasssi',
'sidmassevapsubl',
'sidmassdyn',
'total')
# create header
data_fileh = open(datafile,'w')
data_fileh.write('# Contact: David Bailey dbailey@ucar.edu')
data_fileh.write("\n")
data_fileh.write('# Corresponding HIST file: n/a')
data_fileh.write("\n")
data_fileh.write('# Components of the Arctic sea ice mass budget (Kg s-1):')
data_fileh.write("\n")
data_fileh.write(title_format % headers)
data_fileh.write("\n")
#--------------------------------------------------------------------
# loop over monthly files, calculate budgets, mass and area
# then output to ascii file
# open netcdf files
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassgrowthbot*.nc')
fh1 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassgrowthwat*.nc')
fh2 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassmelttop*.nc')
fh3 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassmeltbot*.nc')
fh4 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmasslat*.nc')
fh5 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmasssi*.nc')
fh6 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassevapsubl*.nc')
fh7 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*sidmassdyn*.nc')
fh8 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*aice.*.nc')
fh9 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case2+'/ice/proc/tseries/month_1/*aice.*.nc')
fh11 = xr.open_mfdataset(files,combine='by_coords')
files = glob.glob(path+case+'/ice/proc/tseries/month_1/*hi.*.nc')
fh10 = xr.open_mfdataset(files,combine='by_coords')
time = fh9.variables['time']
ntimes = len(time)
#
# reset/zero the budget for this month
thisBudget = np.ma.masked_all([len(budgetVars)],dtype=float)
#
#
# calculate budget components
rhoi = 917.
dt = 1800.
for n in range(0,ntimes):
aice1 = fh9.variables['aice'][n,:,:]
aice2 = fh11.variables['aice'][n,:,:]
# mask = np.where((aice1 > 0.15) & (aice2 > 0.15) & (mask < 1.0e10),mask,0.0)
thisVar1 = fh1.variables[budgetVars[0]][n,:,:]
thisBudget[0] = (thisVar1*tarea*mask).sum(dim=['ni','nj'])
thisVar2 = fh2.variables[budgetVars[1]][n,:,:]
thisBudget[1] = (thisVar2*tarea*mask).sum(dim=['ni','nj'])
thisVar3 = fh3.variables[budgetVars[2]][n,:,:]
thisBudget[2] = -(thisVar3*tarea*mask).sum(dim=['ni','nj'])
thisVar4 = fh4.variables[budgetVars[3]][n,:,:]
thisBudget[3] = -(thisVar4*tarea*mask).sum(dim=['ni','nj'])
thisVar5 = fh5.variables[budgetVars[4]][n,:,:]
thisBudget[4] = -(thisVar5*tarea*mask).sum(dim=['ni','nj'])
thisVar6 = fh6.variables[budgetVars[5]][n,:,:]
thisBudget[5] = (thisVar6*tarea*mask).sum(dim=['ni','nj'])
thisVar7 = fh7.variables[budgetVars[6]][n,:,:]
thisBudget[6] = (thisVar7*tarea*mask).sum(dim=['ni','nj'])/rhoi/dt
thisVar8 = fh8.variables[budgetVars[7]][n,:,:]
thisBudget[7] = (thisVar8*tarea*mask).sum(dim=['ni','nj'])
#
# sum all for total
thisBudget[-1] = np.sum(thisBudget[0:-1])
#
# calculate mass and area
thisVar = fh10.variables['hi'][n,:,:]
total_mass = np.sum(thisVar*tarea*mask,dtype=float)*rhoi
thisVar = fh9.variables['aice'][n,:,:]
total_area = np.sum(thisVar*tarea*mask,dtype=float)
total_area = total_area / 1e6 # convert from m^2 to km^2
#
# add row to ascii file
data_fileh.write(data_format % (leftbounds_yr[n],
leftbounds_mo[n],
total_area,
total_mass,
thisBudget[0],
thisBudget[1],
thisBudget[2],
thisBudget[3],
thisBudget[4],
thisBudget[5],
thisBudget[6],
thisBudget[7],
thisBudget[8]))
data_fileh.write("\n")
# close output file
data_fileh.close()