# Quick question about the JRA55-do forcing **URL:** \ **Category:** COSIMA\ **Created:** [19 April 2024 06:42 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052 "2024-04-19T06:42:02Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ribeirosantosn](https://avatars.discourse-cdn.com/v4/letter/r/e495f1/32.png) [@ribeirosantosn](https://forum.access-hive.org.au/u/ribeirosantosn)\ **Post date:** [19 April 2024 06:42 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/1 "2024-04-19T06:42:02Z")
I have a very general question about the JRA-do and how it forces the thermodynamic changes at the surface of the ocean. When I read that e.g. air temperature is prescribed by JRA55-do, does this mean the same air temperature was prescribed in all experiments JRA55-do is used as the forcing e.g. RYF and IAF? ---
**Author:** ![navidcy](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/navidcy/32/101_2.png) [@navidcy](https://forum.access-hive.org.au/u/navidcy)\ **Post date:** [19 April 2024 07:25 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/2 "2024-04-19T07:25:04Z")
No, the forcing is not the same. IAF stands for interannual forcing. It’s the full JRA55-do record. Something like 60 years. RYF stands for repeat-year-forcing. It’s only one particular year of the IAF (the most neutral one) that we loop on repeat. ---
**Author:** ![AndyHoggANU](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/andyhogganu/32/43_2.png) [@AndyHoggANU](https://forum.access-hive.org.au/u/AndyHoggANU)\ **Post date:** [22 April 2024 02:01 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/3 "2024-04-22T02:01:06Z")
Also, to note (in case it wasn’t clear) that JRA55 provides things like surface air temperature, wind speed, humidity, etc – then we have another “Data driven atmosphere model” (known as YATM) which applies the bulk formulae to calculate ocean-atmosphere fluxes (or ice-atmosphere fluxes) of both heat and momentum… ---
**Author:** ![ribeirosantosn](https://avatars.discourse-cdn.com/v4/letter/r/e495f1/32.png) [@ribeirosantosn](https://forum.access-hive.org.au/u/ribeirosantosn)\ **Post date:** [23 April 2024 06:38 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/4 "2024-04-23T06:38:49Z")
Thank you both. This was helpful and answers my question. Cheers ---
**Author:** ![navidcy](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/navidcy/32/101_2.png) [@navidcy](https://forum.access-hive.org.au/u/navidcy)\ **Post date:** [24 April 2024 08:45 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/5 "2024-04-24T08:45:30Z")
for completion, @ribeirosantosn could you mark the response(s) that answered your question with the tick box at the bottom (to the left of the like-heart button)? it’s good practice so that people in the future can find the answer – might not be so relevant in this small thread, but in a thread with 100 messages it comes really handy so it’s a good habit to have ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [24 April 2024 11:53 UTC](https://forum.access-hive.org.au/t/quick-question-about-the-jra55-do-forcing/2052/6 "2024-04-24T11:53:46Z")
more details on IAF / RYF etc are here: [ACCESS-OM2 Control Experiments](https://forum.access-hive.org.au/t/access-om2-control-experiments/258)