issue_comments: 329232732

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https://github.com/pydata/xarray/issues/1572#issuecomment-329232732 https://api.github.com/repos/pydata/xarray/issues/1572 329232732 MDEyOklzc3VlQ29tbWVudDMyOTIzMjczMg== 2443309 2017-09-13T17:02:57Z 2017-09-13T17:02:57Z MEMBER

Thanks. So, as you can see, the swh variable was promoted from a short to a double which is why your dataset has increased in size. The current version of where inserts NaNs in place of fill values but these cannot be represented as a short.

In the next version of xarray (0.10) we will have an improved version of where that will help with some of this. @fmaussion also has some good suggestions. 

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