id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
158785545,MDU6SXNzdWUxNTg3ODU1NDU=,871,Failing arithmetic operations with xarray.DataArray defined with chunks and lock=False,7727985,closed,0,,,2,2016-06-06T22:01:17Z,2016-06-08T18:10:52Z,2016-06-08T18:10:52Z,NONE,,,,"Trying to understand what was raising an exception with several methods associated to oocgcm grid objects that have been sliced ([see](https://github.com/lesommer/oocgcm/issues/33)), I have identified what I think might be an **issue when slicing xarray.DataArray defined with dask chunks + lock=False**. 

A illustration of the issue can be found [in this notebook](https://github.com/lesommer/notebooks/blob/master/Chunking_with_dask_problem.ipynb). I am afraid my understanding of xarray/dask is not sufficient for me to suggest a fix. 
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