html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/557#issuecomment-137257727,https://api.github.com/repos/pydata/xarray/issues/557,137257727,MDEyOklzc3VlQ29tbWVudDEzNzI1NzcyNw==,2443309,2015-09-02T21:57:54Z,2015-09-02T21:57:54Z,MEMBER,"I'd also like to see this come into being.  

My two cents on the syntax is that your second idea is best:

``` Python
pr_dataset.sel('time.year', elnino_years)
```

I don't care much for option 3 since the variable name is being used as an attribute (what if my time variable is called ""Times""?).
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