tide start - Revision history

Robertson: Text replacement - "ocean.in" to "roms.in"

2019-07-17T15:13:44Z

Text replacement - "ocean.in" to "roms.in"

← Older revision		Revision as of 15:13, 17 July 2019
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	----		----

	If the time origin for the harmonic tidal constituents is not the same as the time origin used internally by ROMS then the tidal phase will be in error. To accommodate this possibility, the parameter '''tide_start''' in units of '''days''' can be used to make the appropriate shift to the phase of the harmonic tidal forcing. The value set in [[~~ocean~~.in]].		If the time origin for the harmonic tidal constituents is not the same as the time origin used internally by ROMS then the tidal phase will be in error. To accommodate this possibility, the parameter '''tide_start''' in units of '''days''' can be used to make the appropriate shift to the phase of the harmonic tidal forcing. The value set in [[roms.in]].

	The parameter is used in routine [[set_tides.F]] after conversion into seconds:		The parameter is used in routine [[set_tides.F]] after conversion into seconds:
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	For example, if the date corresponding to <math>\text{tdays}=0</math> in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[~~ocean~~.in]] with		For example, if the date corresponding to <math>\text{tdays}=0</math> in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[roms.in]] with

	TIDE_START = -365.0d0 ! days		TIDE_START = -365.0d0 ! days

Robertson at 16:25, 5 August 2015

2015-08-05T16:25:56Z

← Older revision		Revision as of 16:25, 5 August 2015
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	<div class="title">tide_start</div>		<div class="title">tide_start</div>
	{{#lst:Variables\|tide_start}}		{{#lst:Variables\|tide_start}}
	~~<wikitex>~~
	----		----

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	The parameter is used in routine [[set_tides.F]] after conversion into seconds:		The parameter is used in routine [[set_tides.F]] after conversion into seconds:

	$$\eta = \sum_{i=1}^{N} A_i \cos \frac{2\pi (t-\~~hbox~~{tide\~~_start~~} - \phi_i)}{T_i}$$		<math display="block">\eta = \sum_{i=1}^{N} A_i \cos \frac{2\pi (t-\text{tide}{\_}\text{start} - \phi_i)}{T_i}</math>


	For example, if the date corresponding to $\~~hbox~~{tdays}=0$ in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[ocean.in]] with		For example, if the date corresponding to <math>\text{tdays}=0</math> in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[ocean.in]] with

	TIDE_START = -365.0d0 ! days		TIDE_START = -365.0d0 ! days
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	Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.		Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.
	~~</wikitex>~~

Arango at 02:10, 10 July 2008

2008-07-10T02:10:57Z

← Older revision		Revision as of 02:10, 10 July 2008
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	<div class="title">tide_start</div>		<div class="title">tide_start</div>
	{{#lst:Variables\|tide_start}}		{{#lst:Variables\|tide_start}}
			<wikitex>
	----		----

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	The parameter is used in routine [[set_tides.F]] after conversion into seconds:		The parameter is used in routine [[set_tides.F]] after conversion into seconds:

	~~<math>~~\eta = \sum_{i=1}^N A_i \cos \frac{2\pi (t-~~TIDE~~\~~_START~~ - \phi_i)}{T_i} ~~</math>~~		$$\eta = \sum_{i=1}^{N} A_i \cos \frac{2\pi (t-\hbox{tide\_start} - \phi_i)}{T_i}$$


	For example, if the date corresponding to ~~[[ocean_time]]~~=0 in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[ocean.in]] with		For example, if the date corresponding to $\hbox{tdays}=0$ in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[ocean.in]] with

	TIDE_START = -365.0d0 ! days		TIDE_START = -365.0d0 ! days
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	Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.		Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.
			</wikitex>

Robertson at 19:30, 31 March 2008

2008-03-31T19:30:57Z

← Older revision		Revision as of 19:30, 31 March 2008
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	= ~~TIDE_START =~~		<div class="title">tide_start</div>
			{{#lst:Variables\|tide_start}}

	If the time origin for the harmonic tidal constituents is not the same as the time origin used internally by ROMS then the tidal phase will be in error. To accommodate this possibility, the parameter ~~TIDE_START~~ in units of '''days''' can be used to make the appropriate shift to the phase of the harmonic tidal forcing. The value set in [[ocean.in]].		----

			If the time origin for the harmonic tidal constituents is not the same as the time origin used internally by ROMS then the tidal phase will be in error. To accommodate this possibility, the parameter '''tide_start''' in units of '''days''' can be used to make the appropriate shift to the phase of the harmonic tidal forcing. The value set in [[ocean.in]].

	The parameter is used in routine [[set_tides.F]] after conversion into seconds:		The parameter is used in routine [[set_tides.F]] after conversion into seconds:
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	For example, if the date corresponding to [[ocean_time]]=0 in ROMS is 1-Jan-2006, i.e. ocean_time has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value with		For example, if the date corresponding to [[ocean_time]]=0 in ROMS is 1-Jan-2006, i.e. [[ocean_time]] has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value in your [[ocean.in]] with

	TIDE_START = -365.0d0 ! days		TIDE_START = -365.0d0 ! days
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	Note that TIDE_START will typically be negative for tide harmonic reference times that predate the model time origin.		Note that TIDE_START will typically be negative for tide harmonic reference times that predate the model time origin.

	The value of [[DSTART]] '''does not''' affect how the user sets ~~TIDE_START~~.		The value of [[dstart\|DSTART]] '''does not''' affect how the user sets '''tide_start'''.

	Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.		Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.

Robertson: TIDE START moved to tide start: We are listing these under variable names not .in keywords

2008-03-31T19:16:40Z

TIDE START moved to tide start: We are listing these under variable names not .in keywords

← Older revision	Revision as of 19:16, 31 March 2008
(No difference)

Wilkin at 15:46, 11 December 2006

2006-12-11T15:46:09Z

New page

= TIDE_START =

If the time origin for the harmonic tidal constituents is not the same as the time origin used internally by ROMS then the tidal phase will be in error. To accommodate this possibility, the parameter TIDE_START in units of '''days''' can be used to make the appropriate shift to the phase of the harmonic tidal forcing. The value set in [[ocean.in]].

The parameter is used in routine [[set_tides.F]] after conversion into seconds:

<math>\eta = \sum_{i=1}^N A_i \cos \frac{2\pi (t-TIDE\_START - \phi_i)}{T_i} </math>

For example, if the date corresponding to [[ocean_time]]=0 in ROMS is 1-Jan-2006, i.e. ocean_time has the netcdf units attribute "days since 2006-01-01 00:00:00", but the harmonic forcing data was computed assuming a base date for time of 2005-01-01 00:00:00, then set the value with

TIDE_START = -365.0d0 ! days

Note that TIDE_START will typically be negative for tide harmonic reference times that predate the model time origin.

The value of [[DSTART]] '''does not''' affect how the user sets TIDE_START.

Tidal forcing is activated by CPP options [[SSH_TIDES]] and [[UV_TIDES]] and requires a tide harmonic forcing netcdf file.