# Issue about Using ice cover data

**URL:** <https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821>\
**Category:** v4.2.x\
**Created:** [14 January 2025 19:51 UTC](https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821 "2025-01-14T19:51:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ttlin](https://avatars.discourse-cdn.com/v4/letter/t/7993a0/32.png) [@ttlin](https://nemo-ocean.discourse.group/u/ttlin)\
**Post date:** [14 January 2025 19:51 UTC](https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821/1 "2025-01-14T19:51:49Z")

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Hi,  
My nemo configuration is ORCA2\_ICE\_PISCES.  
I am trying to run the nemo with the ice model off, so I set the ln\_flx = ‘true’ and feed the model ice cover data in namsbc\_iif. However, I meet an unexpected problem that the model stops in reading ice cover data step (I think). The information in log file stop in here and without any error.

 ![image](https://global.discourse-cdn.com/free1/uploads/nemo_ocean/original/1X/d0b10b24969bae6445f82ddf567ef694d5de950a.png) Does anyone have suggestion?

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**Author:** ![smasson](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@smasson](https://nemo-ocean.discourse.group/u/smasson)\
**Post date:** [30 January 2025 09:20 UTC](https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821/2 "2025-01-30T09:20:48Z")

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I think that the reading of the ice cover is ok and that the error is further away…

- Did you check your standard error file to look for an error message?
- Did you try to compile NEMO with debugging options to have more informations?
- You should force the code to uses unbuffered I/O (so you effectively get the latest write in `ocean.output` file) by defining environnement variables:
  - with gfortran  
`export GFORTRAN_UNBUFFERED_PRECONNECTED=1`  
`export GFORTRAN_UNBUFFERED_ALL=1`
  - with ifort  
`export FORT_BUFFERED=0`