# Confusion about SI units for "sn\_slp"(mean seal level pressure) in bulk configuration

**URL:** <https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641>\
**Category:** v4.0.x\
**Tags:** orca\
**Created:** [13 March 2024 10:01 UTC](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641 "2024-03-13T10:01:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![elsy](https://yyz2.discourse-cdn.com/free1/user_avatar/nemo-ocean.discourse.group/elsy/32/163_2.png) [@elsy](https://nemo-ocean.discourse.group/u/elsy)\
**Post date:** [13 March 2024 10:01 UTC](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641/1 "2024-03-13T10:01:42Z")

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Hello everyone, I am a bit confused about the units that should be used for the variable “sn\_slp” defined in “namsbc\_blk” because in the NEMOv4.0.x manual it says that “sn\_slp=slp : mean sea level pressure” should be in “hPa”, but in the module “sbcblk.F90” it says it should be in “Pa”. Can someone clarify this for me?

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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:** [13 March 2024 16:08 UTC](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641/2 "2024-03-13T16:08:19Z")

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It is Pa as written in the code

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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:** [21 March 2024 10:16 UTC](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641/3 "2024-03-21T10:16:21Z")

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