From 6670092523 at student.chula.ac.th  Wed May  6 09:44:27 2026
From: 6670092523 at student.chula.ac.th (Praphatson Luplao)
Date: Wed, 6 May 2026 13:44:27 +0000
Subject: [MITgcm-support] Amplitude and phase preparation method for obcs
	tidal input
Message-ID: <SEZPR01MB5293E75DCE70638B76B6FF9BD83F2@SEZPR01MB5293.apcprd01.prod.exchangelabs.com>

Dear MITgcm Support Team,
I am configuring the OBCS package to apply tidal forcing for a regional simulation. I would like to ask for your guidance on how to prepare OB_u/vTid Am/Ph Files. I am a new user, so I'm quite confused what the theory behind this. I use the data from TPXO. My questions are

  1.
Do we have to multiply amplitude file by node factor?

  1.
Do we have to take contribution from equilibrium argument into phase from TPXO or we can use just epoch (phase lag) obtained directly from TPXO?

also, how can we account for the real date to compare our results with tide gauge data? Can this be adjusted via the CAL package?
Thank you very much for your time.
Best regards,
May

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