[Seavox] FW: [Fwd: Additional Vertical Co-ordinate coverage terms]

[Lowry, Roy K.]

Copying some feedback received directly to the list.....

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-----Original Message-----
From: Jacques POPULUS [mailto:Jacques.Populus at ifremer.fr]
Sent: 23 January 2013 10:06
To: Eric MOUSSAT
Cc: Lowry, Roy K.
Subject: Re: [Fwd: [Seavox] Additional Vertical Co-ordinate coverage terms]

Hi Eric,
Overall these definitions are all right.
By Keeping "littoral" as it is, we avoid to specify too much its upper limit. Some consider the coastline (Roy's comments), some let it go further inland (certainly so in France where the "loi littoral" is about the first 100m inland). Using the definition below gives no upper limit, which I think is to be preferred. If people want to contain it strictly beweent LAT and coastline, then they can use "the intertidal zone".
The lower circa definition is in line with recent literature, although some authors were keen to add the termperature regime as a key driver (the circa features weekly temperature changes while the deep circa only seasonal ones), however you could leave it there for the sake of simplicity .
Upper slope, bathyal and abyssal boundaries are still very much being discussed and biological evidence sought.

Cheers
Jacques



Le 23/01/2013 10:33, Eric MOUSSAT a écrit :
> Bonjour Jacques (et bonne année),
>
> peux-tu donner ton avis sur cette terminologie stp ?
>
> Elle entrera dans le Common vocabulary de SeazDataNet/Geo-Seas et je
> ne voudrais pas qu'elle soit en porte-à-faux avec la terminologie
> employée dans nos différents programme ...
>
>
> Merci de ta contribution
>
>
> Eric
>
>
> -------- Message original --------
> Sujet :     [Seavox] Additional Vertical Co-ordinate coverage terms
> Date :     Wed, 23 Jan 2013 08:16:10 +0000
> De :     Lowry, Roy K. <rkl at bodc.ac.uk>
> Pour :     seavox at mailman.nerc-liv.ac.uk <seavox at mailman.nerc-liv.ac.uk>
> Copie à :     Postlethwaite, Clare <cfpo at bodc.ac.uk>
>
>
>
> Dear All,
>
> It has been pointed out to me that the 'SeaVoX Vertical Co-ordinate
> Coverages' (L13) vocabulary (entity definition: Terms used to describe
> data coverage over the vertical (z) co-ordinate.) is somewhat biased
> towards the atmosphere and the water column, with just one keyword
> (sediment) available to benthic ecolologists.  Consequently, it has
> been proposed that the seven keywords given below with definitions
> provided by CEFAS be added to the controlled vocabulary.
>
> An initial review within BODC has already pointed out that the
> definition of littoral doesn't specify the upper boundary, so maybe a
> better definition (courtesy of Wikipedia) of littoral would be 'that
> part of the shore between the high water mark and the low water mark
> sometimes referred to as the intertidal zone'.
>
> Are there any other comments, objections, definition revisions?  If
> so, please let me have your comments by the end of the month.  I plan
> to include the additions on February 5^th .
>
> Cheers, Roy.
>
> *Littoral        *that part of the shore above the low water mark (i.e.
> anywhere that is exposed at low tide).
>
> *Infralittoral   *the algal dominated zone below the low water mark. It
> extends to a depth where 1% of the surface illumination reaches the
> seabed. This varies according to turbidity, but can be as little as a
> few metres or as much as 70 metres.
>
> *Circalittoral   *the animal dominated zone. On open coastline this is
> from the bottom of the infralittoral zone to the wave-base, i.e. the
> depth to which storms and waves still influence the seabed, typically
> 50 to 80 metres depth for offshore waters.
>
> *Deep Circalittoral      *below the wave-base to the shelf break at ~200
> metres depth. (Sometimes called offshore circalittoral).
>
> *Upper slope     *the upper part of the continental slope, from the edge
> of the shelf break at ~ 200m (also the depth of the seasonal
> thermocline) down to ~ 750 metres (the depth of the permanent
> thermocline).
>
> *Bathybenthic    *below the permanent thermocline (~750m) usually
> incorporating the rest of the shelf slope and the ocean floor to ~2700
> metres. Crosses the 4oC permanent thermocline. Includes several faunal
> discontinuities.
>
> *Abyssobenthic   *below ~ 2700 metres where the bathyal fauna are
> replaced by more primitive abyssal fauna.
>
>
>
>
>
>
>
>
>
>
>
> 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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--
Jacques Populus
DYNECO/Applications Géomatiques
IFREMER - BP 70 - 29280 PLOUZANE - FRANCE Tél : 33 - 298224310 Fax : 33 - 298224548 jpopulus at ifremer.fr http://www.meshatlantic.eu/ http://www.ifremer.fr/anglais/





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