missing values in time series

Hello,

I have a question, I'm trying to create a time series of sea ice area
values and I keep getting the file (*dat) with missing values.

This what a sea ice file looks like:

netcdf avhrr-only-v2.20040711 {
dimensions:
time = 1 ;
zlev = 1 ;
lat = 720 ;
lon = 1440 ;
variables:
float time(time) ;
time:long_name = "Center time of the day" ;
time:units = "days since 1978-01-01 00:00:00" ;
float zlev(zlev) ;
zlev:long_name = "Sea surface height" ;
zlev:units = "meters" ;
zlev:actual_range = "0, 0" ;
float lat(lat) ;
lat:long_name = "Latitude" ;
lat:units = "degrees_north" ;
lat:grids = "Uniform grid from -89.875 to 89.875 by 0.25" ;
float lon(lon) ;
lon:long_name = "Longitude" ;
lon:units = "degrees_east" ;
lon:grids = "Uniform grid from 0.125 to 359.875 by 0.25" ;
short sst(time, zlev, lat, lon) ;
sst:long_name = "Daily sea surface temperature" ;
sst:units = "degrees C" ;
sst:_FillValue = -999s ;
sst:add_offset = 0.f ;
sst:scale_factor = 0.01f ;
sst:valid_min = -300s ;
sst:valid_max = 4500s ;
short anom(time, zlev, lat, lon) ;
anom:long_name = "Daily sea surface temperature anomalies" ;
anom:units = "degrees C" ;
anom:_FillValue = -999s ;
anom:add_offset = 0.f ;
anom:scale_factor = 0.01f ;
anom:valid_min = -1200s ;
anom:valid_max = 1200s ;
short err(time, zlev, lat, lon) ;
err:long_name = "Estimated error standard deviation of analysed_sst" ;
err:units = "degrees C" ;
err:_FillValue = -999s ;
err:add_offset = 0.f ;
err:scale_factor = 0.01f ;
err:valid_min = 0s ;
err:valid_max = 1000s ;
short ice(time, zlev, lat, lon) ;
ice:long_name = "Sea ice concentration" ;
ice:units = "percentage" ;
ice:_FillValue = -999s ;
ice:add_offset = 0.f ;
ice:scale_factor = 0.01f ;
ice:valid_min = 0s ;
ice:valid_max = 100s ;

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