Hi,
I think you should correct the time axis of your file.
time_counter = 15768000, -78926400, 15768000, 15768000, -78926400,
-15854400, -47390400, -15854400, -110462400, -78926400, -78926400,
-47390400, -78926400, -15854400, -110462400, 15768000, 15768000,
-47390400, -110462400, -47390400, ...
is not a correct axis (whatever the reason) because it is neither increasing or decreasing.
You could remove this wrong axis by using ncks (from nco commands)
ncks -Oh -C -x -v time_counter file1.nc file2.nc
ferret will then open your file in the right order and presents it as indices.
Then, define a new axis if needed.
Patrick
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LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ
Data Analysis and Visualization Engineer
ICMC - IPSL Climate Modelling Centre
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