|
|
| Line 1: |
Line 1: |
| 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. |
Revision as of 09:55, 7 May 2021
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.
