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Copy patharea_dxtdyt.py
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162 lines (111 loc) · 4.15 KB
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from netCDF4 import *
import numpy as np
# Grad(Tu)
def areadxtdyt (grid_file):
grid_file = '/short/v45/pas561/mom/archive/gfdl_nyf_1080/output201/ocean_grid.nc'
print 'Reading file ' + grid_file
input1 = Dataset(grid_file, 'r')
area_t = input1.variables['area_t'][:]
print 'area_t at 1000,100=\n ',area_t[1000,1000]
area_u = input1.variables['area_u'][:]
geolon_t = input1.variables['geolon_t'][:]
geolat_t = input1.variables['geolat_t'][:]
geolon_c = input1.variables['geolon_c'][:]
geolat_c = input1.variables['geolat_c'][:]
yt_ocean = input1.variables['yt_ocean'][:]
xt_ocean = input1.variables['xt_ocean'][:]
yu_ocean = input1.variables['yu_ocean'][:]
xu_ocean = input1.variables['xu_ocean'][:]
input1.close()
jm=area_t.shape[0]
im=area_t.shape[1]
print 'jm,im',jm,im
print 'shape area_t=\n ',area_t.shape
r=6378000
dxt=np.zeros((jm,im))
dyt=np.zeros((jm,im))
a=np.zeros((jm,im))
print 'shape a=\n ',a.shape
for j in range(jm):
#print 'j', j
for i in range(im-1):
dlon=np.abs(geolon_t[j,i+1]-geolon_t[j,i])
dxt[j,i]= r*np.cos(geolat_t[j,i]*np.pi/180)*dlon*np.pi/180
dxt[j,im-1]=dxt[j,im-2]
for i in range(im):
for j in range(jm-1):
dlat=np.abs(geolat_t[j+1,i]-geolat_t[j,i])
dyt[j,i]= r*dlat*np.pi/180
dyt[jm-1,i]=dyt[jm-2,i]
for j in range(jm):
for i in range(im):
a[j,i]=dxt[j,i]*dyt[j,i]
print 'a[100,100] sum',a[100,100],np.sum(a)
print 'area_t[100,100]',area_t[100,100],np.sum(area_t)
jm=area_t.shape[0]
im=area_t.shape[1]
print 'jm,im',jm,im
print 'shape area_t=\n ',area_t.shape
r=6378000
dxc=np.zeros((jm,im))
dyc=np.zeros((jm,im))
ac=np.zeros((jm,im))
print 'shape ac=\n ',ac.shape
for j in range(jm):
#print 'j', j
for i in range(im-1):
dlon=np.abs(geolon_c[j,i+1]-geolon_c[j,i])
dxc[j,i]= r*np.cos(geolat_c[j,i]*np.pi/180)*dlon*np.pi/180
dxc[j,im-1]=dxc[j,im-2]
for i in range(im):
for j in range(jm-1):
dlat=np.abs(geolat_c[j+1,i]-geolat_c[j,i])
dyc[j,i]= r*dlat*np.pi/180
dyc[jm-1,i]=dyc[jm-2,i]
for j in range(jm):
for i in range(im):
ac[j,i]=dxc[j,i]*dyc[j,i]
print 'a[100,100] sum',ac[100,100],np.sum(ac)
print 'area_t[100,100]',area_u[100,100],np.sum(area_u)
output_file = 'dxtdyt.nc'
print "Writing output file ",output_file
# Output to NetCDF file
output = Dataset(output_file, 'w', format='NETCDF4')
output.createDimension('yt_ocean', jm)
y_var = output.createVariable('yt_ocean', 'f8', ('yt_ocean',))
y_var.units = 'meters'
y_var[:] = yt_ocean[:]
output.createDimension('xt_ocean', im)
x_var = output.createVariable('xt_ocean', 'f8', ('xt_ocean',))
x_var.units = 'meters'
x_var[:] = xt_ocean[:]
output.createDimension('yu_ocean', jm)
yu_var = output.createVariable('yu_ocean', 'f8', ('yu_ocean',))
yu_var.units = 'meters'
yu_var[:] = yu_ocean[:]
output.createDimension('xu_ocean', im)
xu_var = output.createVariable('xu_ocean', 'f8', ('xu_ocean',))
xu_var.units = 'meters'
xu_var[:] = xu_ocean[:]
dx_var = output.createVariable('dxt', 'f8', ('yt_ocean', 'xt_ocean',))
dx_var.units = 'm'
dx_var[:,:] = dxt
dy_var = output.createVariable('dyt', 'f8', ('yt_ocean', 'xt_ocean',))
dy_var.units = 'm'
dy_var[:,:] = dyt
a_var = output.createVariable('dyt*dxt', 'f8', ('yt_ocean', 'xt_ocean',))
a_var.units = 'm2'
a_var[:,:] = a
dxc_var = output.createVariable('dxu', 'f8', ('yu_ocean', 'xu_ocean',))
dxc_var.units = 'm'
dxc_var[:,:] = dxc
dyc_var = output.createVariable('dyu', 'f8', ('yu_ocean', 'xu_ocean',))
dyc_var.units = 'm'
dyc_var[:,:] = dyc
ac_var = output.createVariable('dyu*dxu', 'f8', ('yu_ocean', 'xu_ocean',))
ac_var.units = 'm2'
ac_var[:,:] = ac
output.close()
print 'finished \n'
if __name__ == "__main":
areadxtdyt(data_file,grid_file)