# \#P4Z

**URL:** https://nemo-ocean.discourse.group/tag/p4z/93.md

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## [\[v.4.0.x\] Instability error and "p4zopt.f90" crash issue that occur on the same day](https://nemo-ocean.discourse.group/t/v-4-0-x-instability-error-and-p4zopt-f90-crash-issue-that-occur-on-the-same-day/312)

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**Author:** [@Jin](https://nemo-ocean.discourse.group/u/Jin)\
**Replies:** 2\
**Last updated:** [24 August 2026 05:41 UTC](https://nemo-ocean.discourse.group/t/v-4-0-x-instability-error-and-p4zopt-f90-crash-issue-that-occur-on-the-same-day/312 "2026-08-24T05:41:06Z")

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Dear all, I have set up ORCA2\_ICE\_PISCES in NEMO v4.0.6 using gfortran compiler. I met two significant errors for running model, which are the instability error and the p4zopt.f90 crash issue. I solved the problem temp…

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## [\[v4.0.x\] \*p4zopt.f90\* crash: out of lower bound value for \`rkrgb\`](https://nemo-ocean.discourse.group/t/v4-0-x-p4zopt-f90-crash-out-of-lower-bound-value-for-rkrgb/290)

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**Author:** [@ukocean](https://nemo-ocean.discourse.group/u/ukocean)\
**Replies:** 3\
**Last updated:** [24 August 2026 05:21 UTC](https://nemo-ocean.discourse.group/t/v4-0-x-p4zopt-f90-crash-out-of-lower-bound-value-for-rkrgb/290 "2026-08-24T05:21:51Z")

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Dear users, I’m trying to run r4.0.7 version of nemo using r05 resolution and get the error message: forrtl: severe (408): fort: (3): Subscript #2 of the array RKRGB has value "-2147483648" which is less than the lower…

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## [Open boundary tracer: TEOS10 cons. temperature, abs. salinity and conversion function to prac. salinity](https://nemo-ocean.discourse.group/t/open-boundary-tracer-teos10-cons-temperature-abs-salinity-and-conversion-function-to-prac-salinity/80)

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**Author:** [@Bijoy](https://nemo-ocean.discourse.group/u/Bijoy)\
**Replies:** 3\
**Last updated:** [24 June 2021 14:29 UTC](https://nemo-ocean.discourse.group/t/open-boundary-tracer-teos10-cons-temperature-abs-salinity-and-conversion-function-to-prac-salinity/80 "2021-06-24T14:29:59Z")

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Hi all, I am using the TEOS-10 in a regional configuration of NEMO4.0.6. It is clear that the model should be initialised with the conservative temperature and absolute salinity. If we use TEOS-10, does the tracer field…