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merra2_to_ufs_cubesphere.py
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merra2_to_ufs_cubesphere.py
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#!/usr/bin/env python
"""
This function is used to create FV3 cubed sphere intial conditions for UFS-Aerosols.
It uses the scipy.interpolate.interp1d function for vertical interpolation and
ESMF bilinear interpolation via xesmf for horizontal interpolation.
"""
import xarray as xr
import numpy as np
import xesmf as xe
from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
import os
import netCDF4
import fv3grid as fg
def horizontal_interp(source,target,method='bilinear'):
"""regrid horizontally using a bilinear interpolation"""
R = xe.Regridder(source,target,method)
out = R(source)
return out
def vertical_interp(source,source_plevs,target_plevs):
""" interpolate with logP using a cubic spline"""
source['lev'] = source_plevs
out = source.interp(lev=target_plevs[1:],method='linear')
return out
def get_fv3_grid(filename):
o = xr.open_dataset(filename)
o = o.rename({'grid_xt':'x',
'grid_yt':'y',
'grid_latt':'latitude',
'grid_lont':'longitude',
'grid_lat':'lat_b',
'grid_lon':'lon_b',
'grid_x':'x_b',
'grid_y':'y_b'}).drop('time')
return o.squeeze().set_coords(['latitude','longitude','lat_b','lon_b'])
def get_merra2_plevs():
"""
Generates the MERRA2 pressure levels using 1000 mb as the surface.
"""
merra_ak = np.array([ 1, 2.00000023841858, 3.27000045776367, 4.75850105285645,
6.60000133514404, 8.93450164794922, 11.9703016281128, 15.9495029449463,
21.1349029541016, 27.8526058197021, 36.5041084289551, 47.5806083679199,
61.6779098510742, 79.5134124755859, 101.944023132324, 130.051025390625,
165.079025268555, 208.497039794922, 262.021057128906, 327.64306640625,
407.657104492188, 504.680114746094, 621.680114746094, 761.984191894531,
929.294189453125, 1127.69018554688, 1364.34020996094, 1645.71032714844,
1979.16040039062, 2373.04052734375, 2836.78051757812, 3381.00073242188,
4017.541015625, 4764.39111328125, 5638.791015625, 6660.34130859375,
7851.2314453125, 9236.572265625, 10866.3017578125, 12783.703125,
15039.302734375, 17693.00390625, 20119.201171875, 21686.501953125,
22436.30078125, 22389.80078125, 21877.59765625, 21214.998046875,
20325.8984375, 19309.6953125, 18161.896484375, 16960.896484375,
15625.99609375, 14290.9951171875, 12869.59375, 11895.8623046875,
10918.1708984375, 9936.521484375, 8909.9921875, 7883.421875,
7062.1982421875, 6436.263671875, 5805.3212890625, 5169.61083984375,
4533.90087890625, 3898.20092773438, 3257.08081054688, 2609.20068359375,
1961.310546875, 1313.48034667969, 659.375244140625, 4.80482578277588, 0])
merra_bk = np.array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8.17541323527848e-09,
0.00696002459153533, 0.0280100405216217, 0.0637200623750687,
0.113602079451084, 0.156224086880684, 0.200350105762482,
0.246741116046906, 0.294403105974197, 0.343381136655807,
0.392891138792038, 0.44374018907547, 0.494590193033218,
0.546304166316986, 0.581041514873505, 0.615818440914154,
0.650634944438934, 0.685899913311005, 0.721165955066681,
0.749378204345703, 0.770637512207031, 0.791946947574615,
0.81330394744873, 0.834660947322845, 0.856018006801605,
0.877429008483887, 0.898908019065857, 0.920387029647827,
0.941865026950836, 0.963406026363373, 0.984951972961426, 1])
phalf_merra = (merra_ak + merra_bk * 100000.)/ 100.
return phalf_merra
def get_fv3_plevs(gfs_ctrl,return_akbk=False):
"""
Return the FV3 pressure levels using the fv3_core file and 1000 mb as the surface.
"""
ak = gfs_ctrl.vcoord.values[0,:]
bk = gfs_ctrl.vcoord.values[1,:]
phalf_fv3 = (ak + bk * 100000.)/ 100.
if return_akbk:
return ak,bk
else:
return phalf_fv3
def open_dataset(filename):
dset = xr.open_dataset(filename,decode_cf=True,mask_and_scale=False,decode_times=False)
return dset
def main():
parser = ArgumentParser(description='Regrid MERRA2 to FV3 native netcdf input files', formatter_class=ArgumentDefaultsHelpFormatter)
parser.add_argument('-m', '--merra_file', help='input merra2 3d file', type=str, required=True)
parser.add_argument('-c', '--core_file', help='fv3 core tile file: example gfs_ctrl.nc', default=None, required=True)
parser.add_argument('-t', '--tracer_file', help='fv3 tile tracer file: example gfs_data.tile1.nc', default=None, required=True)
parser.add_argument('-r', '--resolution', help='fv3 grid resolution: example C384', default=None, required=True)
# parser.add_argument('-g', '--grid_spec', help ='ufs grid_spec file: example grid_spec.tile1.nc', default=None, required=True)
parser.add_argument('-a', '--aerosol', help='True: aerosol file.... False: Gas', default=True, required=False)
args = parser.parse_args()
merra_file = args.merra_file
core_file = args.core_file
tracer_file = args.tracer_file
# grid_file = args.grid_spec
# grid = args.grid_spec
# open files
merra = open_dataset(merra_file).isel(time=0) # only get the first time stamp
core = open_dataset(core_file)
tracer = open_dataset(tracer_file)
tile = int(tracer_file.split('.')[1].strip('tile'))
# grid = get_fv3_grid(grid_file) # open_dataset(grid)
grid = fg.get_fv3_grid(res=args.resolution,tile=tile)
grid.x.attrs = {}
grid.y.attrs = {}
grid.lat_b.attrs = {}
grid.lon_b.attrs = {}
grid.x_b.attrs = {}
grid.y_b.attrs = {}
# choose MERRA2 aerosol files
ntracers = 3
if args.aerosol:
merra_2_aerosols = ['BCPHILIC','BCPHOBIC','DMS',
'DU001','DU002','DU003','DU004','DU005',
'OCPHILIC','OCPHOBIC','SO2','SO4',
'SS001','SS002','SS003','SS004','SS005','MSA']
merra = merra[merra_2_aerosols]
rename_dict = dict(BCPHILIC='bc2',BCPHOBIC='bc1',DMS='dms',
DU001='dust1',DU002='dust2',DU003='dust3',DU004='dust4', DU005='dust5',
SS001='seas1',SS002='seas2',SS003='seas3',SS004='seas4', SS005='seas5',
OCPHILIC='oc2',OCPHOBIC='oc1',SO2='so2',SO4='so4',MSA='msa')
fv3_units = dict(so2='ppm',so4='ug/kg',dms='ppm',msa='ppm',bc2='ug/kg',bc1='ug/kg',
dust1='ug/kg',dust2='ug/kg',dust3='ug/kg',dust4='ug/kg',dust5='ug/kg',
seas1='ug/kg',seas2='ug/kg',seas3='ug/kg',seas4='ug/kg',seas5='ug/kg',
oc1='ug/kg',oc2='ug/kg')
merra = merra.rename(rename_dict)
ntracers += len(merra_2_aerosols)
# get plevs
fv3_press = get_fv3_plevs(core)
merra_press = get_merra2_plevs()[1:]
# interpolate horizontally
hinterped = horizontal_interp(merra,grid,method='bilinear')
# vertically interpolate
hvinterped = vertical_interp(hinterped, np.log(merra_press), np.log(fv3_press))
# construct 3d pressure
p = np.ones(tracer.o3mr.shape)
ak,bk = get_fv3_plevs(core, return_akbk=True)
for i in range(tracer.o3mr.shape[1]):
for j in range(tracer.o3mr.shape[2]):
p[:,i,j] = ak[1:] + bk[1:] * 101325.0
d = p / (287 * tracer.t)
for i in rename_dict:
field = rename_dict[i]
# copy fv3 o3mr to new field
tracer[field] = tracer.o3mr.copy()
tracer[field].attrs['long_name'] = field
tracer[field][:,:,:] = hvinterped[field].data[:,:,:] # convert to kg/kg
tracer[field] = tracer[field].fillna(0.)
# convert units:
for i in fv3_units:
if fv3_units[i] == 'ug/kg':
# this just a quick conversion from kg/kg to ug/kg
tracer[i] = tracer[i] * 1e9
elif fv3_units[i] == 'ppm':
if i == 'dms':
mw = 63.15
if i == 'so2':
mw = 64.066
if i == 'msa':
mw = 96.11
# convert
tracer[i] = tracer[i] * d * 1e6 * 24.45 / mw
tracer[i].attrs['units'] = fv3_units[i]
# move old tracer file
os.rename(tracer_file, tracer_file.replace('.nc','.nc.old'))
# output to original tracer file name
tracer.to_netcdf(tracer_file)
#note that we need to add ntracer back into the file (standard UFS has 3 tracers)
base_file = netCDF4.Dataset(tracer_file, "r+")
base_file.createDimension("ntracer", ntracers)
if __name__ == "__main__":
main()