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/2022#issuecomment-402408267,https://api.github.com/repos/pydata/xarray/issues/2022,402408267,MDEyOklzc3VlQ29tbWVudDQwMjQwODI2Nw==,4338975,2018-07-04T08:41:47Z,2018-07-04T08:41:47Z,NONE,"My use case for this is appending Argo float data to an existing zarr store. At the moment I have 800+ netcdf files that need transforming before they can be added or read by xarray in *.nc type read. At the moment I read the first transform it and add to a zarr sort using .to_zarr. Then I proceed to read the next files and append each variable to zarr using zarr append function.

This is probably not a good way to go but all that I could figure at the moment. 

@shoyer I think it would be useful to have a straight append mode:
`to_zarr(....,mode='a+')`
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