[Seavox] FW: L06 extensions

Mon Aug 12 15:14:16 BST 2013

Hi Nan,

Is the way of getting around this to phrase it along the lines of 'is capable of operation at depths significantly below the surface'?

Cheers, Roy.

________________________________
From: seavox-bounces at mailman.nerc-liv.ac.uk [seavox-bounces at mailman.nerc-liv.ac.uk] On Behalf Of Nan Galbraith [ngalbraith at whoi.edu]
Sent: 12 August 2013 14:52
To: seavox at mailman.nerc-liv.ac.uk
Subject: Re: [Seavox] FW: L06 extensions

Hi Roy and John -

One comment on 27 -  aren't there subsurface gliders that operate at one depth - or
that are sometimes operated at one depth?  And, since they are also free to surface,
occasionally, could you use 'at variable depths' instead of 'at variable depths significantly
below the surface' '?

And for 3c, instead of 'that is confined to operation on the sea surface' could you use
'that operates at a single depth near the sea surface'?

I found it easier if I put the additions in context with related L06 terms, below, because
then  I could see how these fit into the vocabulary.

25- autonomous underwater vehicle- free-roving platform operating in the water column with
    propulsion  but no human operator on board (e.g. Autosub, Glider).
27- sub-surface gliders- platform with buoyancy-based propulsion that is able to
    operate within the water column.
3B- autonomous surface water vehicle- self-propelled vehicle operating on the sea
    surface with no human occupants.
3C- surface gliders- platform with buoyancy-based propulsion that is confined
    to operation on the sea surface.
42- drifting surface float- unmanned instrumented platform operating on the
    surface of the water column often attached to a drogue to track currents
    rather than winds (e.g. Argos buoy).
44- drifting subsurface float- unmanned instrumented platform drifting freely
    in the water column at a depth governed by its density (e.g. Swallow float)
46- drifting subsurface profiling float- unmanned instrumented platform drifting
    freely in the water column that periodically makes vertical traverses
    through the water column (e.g. Argo float)
47- float- free-floating platform either on the surface of the water column
    or at a predetermined depth within the water column.

Cheers - Nan

On 8/12/13 3:30 AM, Lowry, Roy K. wrote:
Should have replied to the list, not just John....

________________________________
From: Lowry, Roy K.
Sent: 12 August 2013 08:19
To: John Graybeal
Subject: RE: [Seavox] L06 extensions

Hi John,

I think we're on different wavelengths regarding the gliders.  What I'm trying to distinguish - following your initial suggestion - are gliders whose spatio-temporal feature type may be reasonably be considered a 2D trajectory (i.e. having a single nominal depth in metadata works) from those where the feature type needs to be a 3D trajectory (i.e. the data make no sense without a depth co-ordinate variable).  You obviously didn't get this from my definitions. The need to surface didn't come into it. If I replace 'within the water column' by 'at variable depths significantly below the surface' does that make it clearer?

A drogue is an underwater parachute attached at a depth of around 40m to surface drifting buoys to encourage them to follow the motion of the water rather than the surface winds.  I considered this to be a well-known term - it's certainly well used by people I know.  Admittedly 'undrogued' is an adaptation of the word that won't be found in the Oxford English Dictionary, but it is creeping into common usage in the operational oceanography community. According to JCOMMOPS it is critical to the definition.  I'll clarify by adding '(no underwater parachute)' unless anybody else objects.

I inherited the sea ice definitions (via Mathieu at JCOMMOPS) from The Canadian Ice Service of Environment Canada, but rephrased them slightly - possibly not very well. Can anybody provide me with improved wording?

Cheers, Roy.

________________________________
From: seavox-bounces at mailman.nerc-liv.ac.uk<mailto:seavox-bounces at mailman.nerc-liv.ac.uk> [seavox-bounces at mailman.nerc-liv.ac.uk<mailto:seavox-bounces at mailman.nerc-liv.ac.uk>] On Behalf Of John Graybeal [jbgraybeal at mindspring.com<mailto:jbgraybeal at mindspring.com>]
Sent: 09 August 2013 16:59
To: seavox at mailman.nerc-liv.ac.uk<mailto:seavox at mailman.nerc-liv.ac.uk>
Subject: Re: [Seavox] L06 extensions

A few thoughts.

3C and 27 are difficult to distinguish. No gliders are exclusively on the sea surface, if by 'glider' we mean a system that uses buoyancy to initiate forward motion. They are all able to operate within the water column.  So I might say
3C: A platform with buoyancy-based propulsion that routinely surfaces to meet its objectives.
27: A platform with buoyancy-based propulsion that can routinely meet its mission objectives without surfacing.
These are then mutually exclusive.

49: The term 'undrogued' is unfamiliar to me, and to my 3 buddies with ocean background. Looking it up seems to product multiple definitions. Any chance we could be more specific? Or perhaps it isn't critical to the definition?

93/94: 'covering over/under 70% of the sea surface' -- at what scale is this metric assessed? I assume we don't mean of the _entire_ sea surface, but we don't mean of the sea surface within 1 meter, either.

John

On Aug 1, 2013, at 05:49, "Lowry, Roy K." <rkl at bodc.ac.uk<mailto:rkl at bodc.ac.uk>> wrote:

Dear All,

Discussions on this have gone quiet, so I'll summarise what has been said into a proposal for change:

New codes:

CODE: 3C
Preferred Label: surface gliders
Definition: A platform with buoyancy-based propulsion that is confined to operation on the sea surface.
Mapping: broadMatch to surface autonomous vehicle

CODE: 27
Preferred Label: sub-surface gliders
Definition: A platform with buoyancy-based propulsion that is able to operate within the water column.
Mapping: broadMatch to autonomous underwater vehicle

CODE: 49
Preferred Label:  surface ice buoy
Definition: An undrogued surface float that is deployed in regions where sea ice forms that moves with either ice or water depending upon the time of year.
Mapping: broadMatch drifting surface float

CODE: 93
Preferred Label: pack ice
Definition: Sea ice not connected to land covering over 70% of the sea surface.
Mapping: broadMatch cryosphere

CODE: 94
Preferred Label: drift ice
Definition: Sea ice not connected to land covering under 70% of the sea surface.
Mapping: broadMatch cryosphere

If there are no further comments I'll add these records to the vocabulary when I return from leave on August 20th.

Cheers, Roy.

Please note that I now work part-time from Tuesday to Thursday.  E-mail response on other days is possible but not guaranteed!

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