Band Pass filter to dataset with topographic masking

Hello,

I want to use 20-100-day band-pass filter to the anomalous u850 data from MERRA Reanalysis.
But the region in high mountains (e.g. the Himalaya/ Tibetan plateau) is masked with missing values in the dataset.
So, the "band_pass_latlon_time" function is not allowing me to filtering the dataset.
What is the alternate way to use the filter?
  
With regards,
Abhik
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Abhik Santra
CSIR Research Fellow,
Indian Institute of Tropical Meteorology,
Pune - 411008.
India
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Received on Fri Jan 25 06:37:31 2013