Re: [CF-metadata] sea_water_turbidity

[alison.pamment]

Dear John, All,

There have been no further comments in the last seven days so 
sea_water_turbidity (1) is now accepted for inclusion in the standard name 
table and will be added at the next update.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory 
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.



> -Original Message-
> From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf
> Of alison.pamm...@stfc.ac.uk
> Sent: 11 March 2013 12:37
> To: cf-metadata@cgd.ucar.edu
> Subject: Re: [CF-metadata] sea_water_turbidity
> 
> Dear All,
> 
> I think we have now reached consensus on this name:
> sea_water_turbidity (units of '1' i.e. dimensionless)
> 'Turbidity is a dimensionless quantity which is expressed in NTU
> (Nephelometric Turbidity Units). Turbidity expressed in NTU is the
> proportion of white light scattered back to a transceiver by the particulate
> load in a body of water, represented on an arbitrary scale referenced
> against measurements made in the laboratory on aqueous suspensions of
> formazine beads. Sea water turbidity may also be measured by the quantity
> with standard name secchi_depth_of_sea_water.'
> 
> Unless further comments are received within the next seven days this name
> will be accepted and included in the next update of the standard name
> table.
> 
> A cross-reference to the new name will be added to the definition of
> secchi_depth_of_sea_water: 'Sea water turbidity may also be measured by
> the quantity with standard name sea_water_turbidity.'
> 
> Best wishes,
> Alison
> 
> --
> Alison Pamment  Tel: +44 1235 778065
> NCAS/British Atmospheric Data CentreEmail: alison.pamm...@stfc.ac.uk
> STFC Rutherford Appleton Laboratory
> R25, 2.22
> Harwell Oxford, Didcot, OX11 0QX, U.K.
> 
> 
> From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf
> Of alison.pamm...@stfc.ac.uk
> Sent: 07 March 2013 12:17
> To: cf-metadata@cgd.ucar.edu
> Subject: Re: [CF-metadata] sea_water_turbidity
> 
> Dear John,
> 
> Thanks for checking. I'm happy with the units of 1 and your amended
> definition.
> 
> Best wishes,
> Alison
> 
> --
> Alison Pamment  Tel: +44 1235 778065
> NCAS/British Atmospheric Data Centre    Email: alison.pamm...@stfc.ac.uk
> STFC Rutherford Appleton Laboratory
> R25, 2.22
> Harwell Oxford, Didcot, OX11 0QX, U.K.
> 
> 
> From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf
> Of John Maurer
> Sent: 07 March 2013 01:19
> To: cf-metadata@cgd.ucar.edu
> Subject: [CF-metadata] sea_water_turbidity
> 
> Thanks, Alison. After further consideration as well as discussion with some
> of our water quality colleagues, I think the dimensionless units of NTU may
> be better expressed in UDUNITS as "1" instead of "1e-3" (parts per
> thousand) since the values normally range in the 0-10+ range (rather than
> 0.001-0.01+). So, I would modify the units to "1" and slightly modify your
> proposed definition to the following:
> 
> 'Turbidity is a dimensionless quantity which is expressed in NTU
> (Nephelometric Turbidity Units). Turbidity expressed in NTU is the
> proportion of white light scattered back to a transceiver by the particulate
> load in a body of water, represented on an arbitrary scale referenced
> against measurements made in the laboratory on aqueous suspensions of
> formazine beads. Sea water turbidity may also be measured by the quantity
> with standard name secchi_depth_of_sea_water.'
> 
> Cheers,
> John
> 
> Message: 2
> Date: Wed, 6 Mar 2013 12:08:09 +
> From: 
> To: 
> Subject: Re: [CF-metadata] sea_water_turbidity
> Message-ID:
>         <014539ac4976be4490a360410a8c2017569ec...@exchmbx01.fed.cclrc.
> ac.uk>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Dear John and Roy,
> 
> Thanks for your comments. Based on the explanations you have provided I
> suggest that the wording of the definition should be 'Turbidity is a
> dimensionless quantity which is expressed in NTU (Nephelometric Turbidity
> Units), which are normally given as 1e-3 or 0.001 i.e. parts per thousand.
> Turbidity expressed in NTU is the proportion of white light scattered back to
> a transceiver by the particulate load in a body of water, represented on an
> arbitrary scale referenced against measurements made in the laboratory on
> aqueous suspensions of formazine beads. Sea water turbidity may also be
> measured by the quantit

Re: [CF-metadata] sea_water_turbidity

[alison.pamment]

Dear All,

I think we have now reached consensus on this name:
sea_water_turbidity (units of '1' i.e. dimensionless)
'Turbidity is a dimensionless quantity which is expressed in NTU (Nephelometric 
Turbidity Units). Turbidity expressed in NTU is the proportion of white light 
scattered back to a transceiver by the particulate load in a body of water, 
represented on an arbitrary scale referenced against measurements made in the 
laboratory on aqueous suspensions of formazine beads. Sea water turbidity may 
also be measured by the quantity with standard name secchi_depth_of_sea_water.'

Unless further comments are received within the next seven days this name will 
be accepted and included in the next update of the standard name table.

A cross-reference to the new name will be added to the definition of 
secchi_depth_of_sea_water: 'Sea water turbidity may also be measured by the 
quantity with standard name sea_water_turbidity.'

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory 
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of 
alison.pamm...@stfc.ac.uk
Sent: 07 March 2013 12:17
To: cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] sea_water_turbidity

Dear John,

Thanks for checking. I'm happy with the units of 1 and your amended definition.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre    Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory 
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 07 March 2013 01:19
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity

Thanks, Alison. After further consideration as well as discussion with some of 
our water quality colleagues, I think the dimensionless units of NTU may be 
better expressed in UDUNITS as "1" instead of "1e-3" (parts per thousand) since 
the values normally range in the 0-10+ range (rather than 0.001-0.01+). So, I 
would modify the units to "1" and slightly modify your proposed definition to 
the following:

'Turbidity is a dimensionless quantity which is expressed in NTU (Nephelometric 
Turbidity Units). Turbidity expressed in NTU is the proportion of white light 
scattered back to a transceiver by the particulate load in a body of water, 
represented on an arbitrary scale referenced against measurements made in the 
laboratory on aqueous suspensions of formazine beads. Sea water turbidity may 
also be measured by the quantity with standard name secchi_depth_of_sea_water.'

Cheers,
John

Message: 2
Date: Wed, 6 Mar 2013 12:08:09 +
From: 
To: 
Subject: Re: [CF-metadata] sea_water_turbidity
Message-ID:
        <014539ac4976be4490a360410a8c2017569ec...@exchmbx01.fed.cclrc.ac.uk>
Content-Type: text/plain; charset="iso-8859-1"

Dear John and Roy,

Thanks for your comments. Based on the explanations you have provided I suggest 
that the wording of the definition should be 'Turbidity is a dimensionless 
quantity which is expressed in NTU (Nephelometric Turbidity Units), which are 
normally given as 1e-3 or 0.001 i.e. parts per thousand. Turbidity expressed in 
NTU is the proportion of white light scattered back to a transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads. Sea water turbidity may also be measured by the quantity 
with standard name secchi_depth_of_sea_water.'

I suggest also that we could improve the definition of the secchi_depth name to 
make it clearer that the quantity relates to turbidity and add a 
cross-reference to the new name:
secchi_depth_of_sea_water - ' Depth is the vertical distance below the surface. 
A Secchi disk is a patterned disk that is used to measure water transparency, 
also called turbidity, in oceans and lakes. The disk is lowered into the water 
and the depth at which the pattern is no longer visible is the called the 
secchi depth. Sea water turbidity may also be measured by the quantity with 
standard name sea_water_turbidity.'

Do you agree?

Best wishes,
Alison

--
Alison Pamment                          Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre    Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 05 March 2013 00:23
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity

Yes, I agree with Roy's assessment. Thank you.
Chee

Re: [CF-metadata] sea_water_turbidity

[alison.pamment]

Dear John,

Thanks for checking. I'm happy with the units of 1 and your amended definition.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: 
alison.pamm...@stfc.ac.uk<mailto:j.a.pamm...@rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 07 March 2013 01:19
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity

Thanks, Alison. After further consideration as well as discussion with some of 
our water quality colleagues, I think the dimensionless units of NTU may be 
better expressed in UDUNITS as "1" instead of "1e-3" (parts per thousand) since 
the values normally range in the 0-10+ range (rather than 0.001-0.01+). So, I 
would modify the units to "1" and slightly modify your proposed definition to 
the following:

'Turbidity is a dimensionless quantity which is expressed in NTU (Nephelometric 
Turbidity Units). Turbidity expressed in NTU is the proportion of white light 
scattered back to a transceiver by the particulate load in a body of water, 
represented on an arbitrary scale referenced against measurements made in the 
laboratory on aqueous suspensions of formazine beads. Sea water turbidity may 
also be measured by the quantity with standard name secchi_depth_of_sea_water.'

Cheers,
John

Message: 2
Date: Wed, 6 Mar 2013 12:08:09 +
From: mailto:alison.pamm...@stfc.ac.uk>>
To: mailto:cf-metadata@cgd.ucar.edu>>
Subject: Re: [CF-metadata] sea_water_turbidity
Message-ID:

<014539ac4976be4490a360410a8c2017569ec...@exchmbx01.fed.cclrc.ac.uk<mailto:014539ac4976be4490a360410a8c2017569ec...@exchmbx01.fed.cclrc.ac.uk>>
Content-Type: text/plain; charset="iso-8859-1"

Dear John and Roy,

Thanks for your comments. Based on the explanations you have provided I suggest 
that the wording of the definition should be 'Turbidity is a dimensionless 
quantity which is expressed in NTU (Nephelometric Turbidity Units), which are 
normally given as 1e-3 or 0.001 i.e. parts per thousand. Turbidity expressed in 
NTU is the proportion of white light scattered back to a transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads. Sea water turbidity may also be measured by the quantity 
with standard name secchi_depth_of_sea_water.'

I suggest also that we could improve the definition of the secchi_depth name to 
make it clearer that the quantity relates to turbidity and add a 
cross-reference to the new name:
secchi_depth_of_sea_water - ' Depth is the vertical distance below the surface. 
A Secchi disk is a patterned disk that is used to measure water transparency, 
also called turbidity, in oceans and lakes. The disk is lowered into the water 
and the depth at which the pattern is no longer visible is the called the 
secchi depth. Sea water turbidity may also be measured by the quantity with 
standard name sea_water_turbidity.'

Do you agree?

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 
778065
NCAS/British Atmospheric Data CentreEmail: 
alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata 
[mailto:cf-metadata-boun...@cgd.ucar.edu<mailto:cf-metadata-boun...@cgd.ucar.edu>]
 On Behalf Of John Maurer
Sent: 05 March 2013 00:23
To: cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu>
Subject: [CF-metadata] sea_water_turbidity

Yes, I agree with Roy's assessment. Thank you.
Cheers,
John

Date: Wed, 27 Feb 2013 21:19:01 +
From: "Lowry, Roy K." mailto:r...@bodc.ac.uk>>
To: "alison.pamm...@stfc.ac.uk<mailto:alison.pamm...@stfc.ac.uk>" 
mailto:alison.pamm...@stfc.ac.uk>>,
? ? ? ? "cf-metadata@cgd.ucar.edu<mailto:cf-metadata@cgd.ucar.edu>" 
mailto:cf-metadata@cgd.ucar.edu>>
Subject: Re: [CF-metadata] sea_water_turbidity?
Message-ID:
? ? ? ? 
<40829b0e077c1145a6de44d39b3830a922989bd...@nerckwmb1.ad.nerc.ac.uk<mailto:40829b0e077c1145a6de44d39b3830a922989bd...@nerckwmb1.ad.nerc.ac.uk>>
Content-Type: text/plain; charset="Windows-1252"

Hello Alison,

I had been hanging back waiting for John to respond to Jonathan's comment, 
because nephelometric turbidity is a phenomenon that I've seen described - but 
not necessarily defined - in a couple of different ways. ?However, whilst both 
turbidity and secchi disk depth (and attenuance to the matter) have values 
related to the SPM load in the water body, they differ markedly for a given SPM 
load and so I think a new standard name i

Re: [CF-metadata] sea_water_turbidity

[Lowry, Roy K.]

Hi Alison,

Looks good to me.

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!

-Original Message-
From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of 
alison.pamm...@stfc.ac.uk
Sent: 06 March 2013 12:08
To: cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] sea_water_turbidity

Dear John and Roy,

Thanks for your comments. Based on the explanations you have provided I suggest 
that the wording of the definition should be 'Turbidity is a dimensionless 
quantity which is expressed in NTU (Nephelometric Turbidity Units), which are 
normally given as 1e-3 or 0.001 i.e. parts per thousand. Turbidity expressed in 
NTU is the proportion of white light scattered back to a transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads. Sea water turbidity may also be measured by the quantity 
with standard name secchi_depth_of_sea_water.'

I suggest also that we could improve the definition of the secchi_depth name to 
make it clearer that the quantity relates to turbidity and add a 
cross-reference to the new name:
secchi_depth_of_sea_water - ' Depth is the vertical distance below the surface. 
A Secchi disk is a patterned disk that is used to measure water transparency, 
also called turbidity, in oceans and lakes. The disk is lowered into the water 
and the depth at which the pattern is no longer visible is the called the 
secchi depth. Sea water turbidity may also be measured by the quantity with 
standard name sea_water_turbidity.'

Do you agree?

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 05 March 2013 00:23
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity

Yes, I agree with Roy's assessment. Thank you.
Cheers,
John

Date: Wed, 27 Feb 2013 21:19:01 +
From: "Lowry, Roy K." 
To: "alison.pamm...@stfc.ac.uk" ,
        "cf-metadata@cgd.ucar.edu" 
Subject: Re: [CF-metadata] sea_water_turbidity?
Message-ID:
<40829b0e077c1145a6de44d39b3830a922989bd...@nerckwmb1.ad.nerc.ac.uk>
Content-Type: text/plain; charset="Windows-1252"

Hello Alison,

I had been hanging back waiting for John to respond to Jonathan's comment, 
because nephelometric turbidity is a phenomenon that I've seen described - but 
not necessarily defined - in a couple of different ways.  However, whilst both 
turbidity and secchi disk depth (and attenuance to the matter) have values 
related to the SPM load in the water body, they differ markedly for a given SPM 
load and so I think a new standard name is justified.

As a prompt, I'll give one of my understandings of turbidity in NTU, which is 
'The proportion of white light scattered back to the transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads.'  Before going any further we need John to either confirm 
that this is what he means or come up with an alternative.  Others might also 
have their own ideas

Cheers, Roy.
__
__
From: CF-metadata [cf-metadata-boun...@cgd.ucar.edu] On Behalf Of 
alison.pamm...@stfc.ac.uk [alison.pamm...@stfc.ac.uk]
Sent: 27 February 2013 14:04
To: cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] sea_water_turbidity?

Dear John,

Thank you for your proposal.

We currently have one existing standard name relating to turbidity of sea 
water, secchi_depth_of_sea_water, which has units of metres and is defined as 
?Depth is the vertical distance below the surface. A Secchi disk is a patterned 
disk that is used to measure water transparency in oceans and lakes. The disk 
is lowered into the water and the depth at which the pattern is no longer 
visible is the called the secchi depth.?

I agree with Jonathan that it would be helpful if you could provide a (fairly 
brief) definition for the new name or perhaps a suitable reference.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065 NCAS/British 
Atmospheric Data CentreEmail: 
alison.pamm...@stfc.ac.uk<mailto:j.a.pamm...@rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 21 February 2013 00:52
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity?

Dear CF-Metadata,
I would propose

Re: [CF-metadata] sea_water_turbidity

[alison.pamment]

Dear John and Roy,

Thanks for your comments. Based on the explanations you have provided I suggest 
that the wording of the definition should be 'Turbidity is a dimensionless 
quantity which is expressed in NTU (Nephelometric Turbidity Units), which are 
normally given as 1e-3 or 0.001 i.e. parts per thousand. Turbidity expressed in 
NTU is the proportion of white light scattered back to a transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads. Sea water turbidity may also be measured by the quantity 
with standard name secchi_depth_of_sea_water.'

I suggest also that we could improve the definition of the secchi_depth name to 
make it clearer that the quantity relates to turbidity and add a 
cross-reference to the new name:
secchi_depth_of_sea_water - ' Depth is the vertical distance below the surface. 
A Secchi disk is a patterned disk that is used to measure water transparency, 
also called turbidity, in oceans and lakes. The disk is lowered into the water 
and the depth at which the pattern is no longer visible is the called the 
secchi depth. Sea water turbidity may also be measured by the quantity with 
standard name sea_water_turbidity.'

Do you agree?

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory 
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 05 March 2013 00:23
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity

Yes, I agree with Roy's assessment. Thank you.
Cheers,
John

Date: Wed, 27 Feb 2013 21:19:01 +
From: "Lowry, Roy K." 
To: "alison.pamm...@stfc.ac.uk" ,
        "cf-metadata@cgd.ucar.edu" 
Subject: Re: [CF-metadata] sea_water_turbidity?
Message-ID:
        <40829b0e077c1145a6de44d39b3830a922989bd...@nerckwmb1.ad.nerc.ac.uk>
Content-Type: text/plain; charset="Windows-1252"

Hello Alison,

I had been hanging back waiting for John to respond to Jonathan's comment, 
because nephelometric turbidity is a phenomenon that I've seen described - but 
not necessarily defined - in a couple of different ways.  However, whilst both 
turbidity and secchi disk depth (and attenuance to the matter) have values 
related to the SPM load in the water body, they differ markedly for a given SPM 
load and so I think a new standard name is justified.

As a prompt, I'll give one of my understandings of turbidity in NTU, which is 
'The proportion of white light scattered back to the transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads.'  Before going any further we need John to either confirm 
that this is what he means or come up with an alternative.  Others might also 
have their own ideas

Cheers, Roy.
__
__
From: CF-metadata [cf-metadata-boun...@cgd.ucar.edu] On Behalf Of 
alison.pamm...@stfc.ac.uk [alison.pamm...@stfc.ac.uk]
Sent: 27 February 2013 14:04
To: cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] sea_water_turbidity?

Dear John,

Thank you for your proposal.

We currently have one existing standard name relating to turbidity of sea 
water, secchi_depth_of_sea_water, which has units of metres and is defined as 
?Depth is the vertical distance below the surface. A Secchi disk is a patterned 
disk that is used to measure water transparency in oceans and lakes. The disk 
is lowered into the water and the depth at which the pattern is no longer 
visible is the called the secchi depth.?

I agree with Jonathan that it would be helpful if you could provide a (fairly 
brief) definition for the new name or perhaps a suitable reference.

Best wishes,
Alison

--
Alison Pamment                          Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre    Email: 
alison.pamm...@stfc.ac.uk<mailto:j.a.pamm...@rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 21 February 2013 00:52
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity?

Dear CF-Metadata,
I would propose the addition of "sea_water_turbidity" to the CF Standard Names. 
This has units of NTU (Nephelometric Turbidity Units), which would be 
represented in UDUNITS as "1e-3" (similar to how sea_water_salinity is in PSS 
(or PSU) and commonly represented as 1e-3).
Thanks,
John Maurer
Data System Administrator
Pacific Islands Ocean Observing System (PacIOOS)
University of Hawaii at Manoa
-

Re: [CF-metadata] sea_water_turbidity?

[Lowry, Roy K.]

Hello Alison,

I had been hanging back waiting for John to respond to Jonathan's comment, 
because nephelometric turbidity is a phenomenon that I've seen described - but 
not necessarily defined - in a couple of different ways.  However, whilst both 
turbidity and secchi disk depth (and attenuance to the matter) have values 
related to the SPM load in the water body, they differ markedly for a given SPM 
load and so I think a new standard name is justified.

As a prompt, I'll give one of my understandings of turbidity in NTU, which is 
'The proportion of white light scattered back to the transceiver by the 
particulate load in a body of water, represented on an arbitrary scale 
referenced against measurements made in the laboratory on aqueous suspensions 
of formazine beads.'  Before going any further we need John to either confirm 
that this is what he means or come up with an alternative.  Others might also 
have their own ideas

Cheers, Roy.

From: CF-metadata [cf-metadata-boun...@cgd.ucar.edu] On Behalf Of 
alison.pamm...@stfc.ac.uk [alison.pamm...@stfc.ac.uk]
Sent: 27 February 2013 14:04
To: cf-metadata@cgd.ucar.edu
Subject: Re: [CF-metadata] sea_water_turbidity?

Dear John,

Thank you for your proposal.

We currently have one existing standard name relating to turbidity of sea 
water, secchi_depth_of_sea_water, which has units of metres and is defined as 
‘Depth is the vertical distance below the surface. A Secchi disk is a patterned 
disk that is used to measure water transparency in oceans and lakes. The disk 
is lowered into the water and the depth at which the pattern is no longer 
visible is the called the secchi depth.’

I agree with Jonathan that it would be helpful if you could provide a (fairly 
brief) definition for the new name or perhaps a suitable reference.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: 
alison.pamm...@stfc.ac.uk<mailto:j.a.pamm...@rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 21 February 2013 00:52
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity?

Dear CF-Metadata,
I would propose the addition of "sea_water_turbidity" to the CF Standard Names. 
This has units of NTU (Nephelometric Turbidity Units), which would be 
represented in UDUNITS as "1e-3" (similar to how sea_water_salinity is in PSS 
(or PSU) and commonly represented as 1e-3).
Thanks,
John Maurer
Data System Administrator
Pacific Islands Ocean Observing System (PacIOOS)
University of Hawaii at Manoa


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Re: [CF-metadata] sea_water_turbidity?

[alison.pamment]

Dear John,

Thank you for your proposal.

We currently have one existing standard name relating to turbidity of sea 
water, secchi_depth_of_sea_water, which has units of metres and is defined as 
'Depth is the vertical distance below the surface. A Secchi disk is a patterned 
disk that is used to measure water transparency in oceans and lakes. The disk 
is lowered into the water and the depth at which the pattern is no longer 
visible is the called the secchi depth.'

I agree with Jonathan that it would be helpful if you could provide a (fairly 
brief) definition for the new name or perhaps a suitable reference.

Best wishes,
Alison

--
Alison Pamment  Tel: +44 1235 778065
NCAS/British Atmospheric Data CentreEmail: 
alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.


From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of John 
Maurer
Sent: 21 February 2013 00:52
To: cf-metadata@cgd.ucar.edu
Subject: [CF-metadata] sea_water_turbidity?

Dear CF-Metadata,
I would propose the addition of "sea_water_turbidity" to the CF Standard Names. 
This has units of NTU (Nephelometric Turbidity Units), which would be 
represented in UDUNITS as "1e-3" (similar to how sea_water_salinity is in PSS 
(or PSU) and commonly represented as 1e-3).
Thanks,
John Maurer
Data System Administrator
Pacific Islands Ocean Observing System (PacIOOS)
University of Hawaii at Manoa

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