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https://github.com/pydata/xarray/issues/1989#issuecomment-373226888 https://api.github.com/repos/pydata/xarray/issues/1989 373226888 MDEyOklzc3VlQ29tbWVudDM3MzIyNjg4OA== 6815844 2018-03-15T01:10:37Z 2018-03-15T01:15:33Z MEMBER

I notice that bottleneck does the dtype conversion. I think in your environment bottleneck is installed.

```python In [9]: np.sum(a) # equivalent to a.sum(), using bottleneck Out[9]: <xarray.DataArray ()> array(499943.21875)

In [10]: np.sum(a.data) # numpy native Out[10]: 499941.53

In [15]: bn.nansum(a.data) Out[15]: 499943.21875

In [11]: a.sum(dim=('x', 'y')) # multiple dims calls native np.sum Out[11]: <xarray.DataArray ()> array(499941.53, dtype=float32) ```

It might be an upstream issue.

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