Direction of the vertical velocity - Revision history

Aleboyer at 16:07, 6 June 2024

2024-06-06T16:07:02Z

← Older revision		Revision as of 16:07, 6 June 2024
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	The direction of the vertical velocity of the profiler is important.		The direction of the vertical velocity of the profiler is important.
	Most vertical profilers collect data while they are descending, and the data collected while ascending is useless because the probes are in the wake of the instrument and there is no oncoming flow over the shear probes.		Most vertical profilers collect data while they are '''descending''', and the data collected while '''ascending''' is useless because the probes are in the wake of the instrument and there is no oncoming flow over the shear probes.
	However, some profilers are designed to collect data while they are ascending and the data collected during it descent is not useable.		However, some profilers are designed to collect data while they are ascending and the data collected during it descent is not useable.
	Gliders can produce meaningful data while descending and ascending.		'''Gliders can produce meaningful data while descending and ascending'''.
	So, it is important to know what type of instrument was used to collect your shear-probe data, so that you select data from when it was travelling in the appropriate direction.		So, it is important to know what type of instrument was used to collect your shear-probe data, so that you select data from when it was travelling in the appropriate direction.

CynthiaBluteau: Categorization

2021-11-23T15:23:16Z

Categorization

← Older revision		Revision as of 15:23, 23 November 2021
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	return to [[Flow chart for shear probes]]		return to [[Flow chart for shear probes]]


			[[Category:Shear probes]]

Rolf at 19:55, 18 November 2021

2021-11-18T19:55:53Z

← Older revision		Revision as of 19:55, 18 November 2021
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	The direction of the vertical velocity of the profiler is important.		The direction of the vertical velocity of the profiler is important.
	Most vertical profilers collect data while they are descending, and the data collected while ascending is useless ~~be4cause~~ the probes are in the wake of the instrument and there is no oncoming flow over the shear ~~proves~~.		Most vertical profilers collect data while they are descending, and the data collected while ascending is useless because the probes are in the wake of the instrument and there is no oncoming flow over the shear probes.
	However, some profilers are designed to collect data while they are ascending and the data collected during it descent is not useable.		However, some profilers are designed to collect data while they are ascending and the data collected during it descent is not useable.
	Gliders can produce meaningful data while descending and ascending.		Gliders can produce meaningful data while descending and ascending.
	So, it is important to know what type of instrument was used to collect your shear-probe data.		So, it is important to know what type of instrument was used to collect your shear-probe data, so that you select data from when it was travelling in the appropriate direction.

Rolf at 19:52, 18 November 2021

2021-11-18T19:52:09Z

← Older revision		Revision as of 19:52, 18 November 2021
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	The direction of the vertical velocity of the profiler is important – some profilers are designed to collect data while they are ascending. Gliders can produce meaningful data while descending and ascending.		The direction of the vertical velocity of the profiler is important.
			Most vertical profilers collect data while they are descending, and the data collected while ascending is useless be4cause the probes are in the wake of the instrument and there is no oncoming flow over the shear proves.
			However, some profilers are designed to collect data while they are ascending and the data collected during it descent is not useable.
			Gliders can produce meaningful data while descending and ascending.
			So, it is important to know what type of instrument was used to collect your shear-probe data.

Aleboyer at 03:25, 5 November 2021

2021-11-05T03:25:37Z

← Older revision		Revision as of 03:25, 5 November 2021
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	The direction of the vertical velocity of the profiler is important – some profilers are designed to ~~collected~~ data while they are ascending. Gliders can produce meaningful data while descending and ascending.		The direction of the vertical velocity of the profiler is important – some profilers are designed to collect data while they are ascending. Gliders can produce meaningful data while descending and ascending.




			-----------------------------
			return to [[Flow chart for shear probes]]

KikiSchulz at 09:55, 7 May 2021

2021-05-07T09:55:37Z

← Older revision		Revision as of 09:55, 7 May 2021
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	A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.

	A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.

	The criteria listed above are mainly for vertical profilers and for gliders. For AUVs and for moored instruments, the minimum speed of profiling – the speed of the AUV or the speed of the current past the mooring – will be the most relevant criterion for selecting a profile.

	The minimum magnitude of the vertical velocity is a criterion that can be applied to both vertical profilers and to gliders. However, the minimum vertical speed is about two times smaller for a glider compared to a vertical profiler because the glider path angle is about 30°.

	The direction of the vertical velocity of the profiler is important – some profilers are designed to collected data while they are ascending. Gliders can produce meaningful data while descending and ascending.		The direction of the vertical velocity of the profiler is important – some profilers are designed to collected data while they are ascending. Gliders can produce meaningful data while descending and ascending.

KikiSchulz at 09:50, 7 May 2021

2021-05-07T09:50:56Z

← Older revision		Revision as of 09:50, 7 May 2021
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	A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.		A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.

			A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.

			The criteria listed above are mainly for vertical profilers and for gliders. For AUVs and for moored instruments, the minimum speed of profiling – the speed of the AUV or the speed of the current past the mooring – will be the most relevant criterion for selecting a profile.

			The minimum magnitude of the vertical velocity is a criterion that can be applied to both vertical profilers and to gliders. However, the minimum vertical speed is about two times smaller for a glider compared to a vertical profiler because the glider path angle is about 30°.

			The direction of the vertical velocity of the profiler is important – some profilers are designed to collected data while they are ascending. Gliders can produce meaningful data while descending and ascending.

KikiSchulz: Created page with "A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical..."

2021-05-07T09:46:55Z

Created page with "A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical..."

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A data file may start before an instrument is even in the water. Vertical profilers are often held near the surface before they are released. During such a time, the vertical velocity may fluctuate significantly around a mean of zero, but the data cannot be used for dissipation rate estimation. A data file may also contain many profiles that are interrupted by useless data, such as the retrieval of a tethered profiler back to the surface. The direction of profiling can be used to eliminate such segments.