[OBSIPtec] OBSIPtec Digest, Vol 17, Issue 3

[Kasey Aderhold]

Hello Paul,

Thank you for bringing these questions forward, and please continue to 
do so.  This is a perfect example of what the OBSIPtec mailing list was 
created for.
/
/
/1. Can you tell me the units used for pressure on the Lamont 
instruments? I am assuming pascals, but I don't //
/
/see them written down anywhere. //
//
/*This information can be found in the metadata, which can be explored 
via the IRIS DMC MetaData Aggregator (**example of station 7D.J50C HXH 
channel 
<http://ds.iris.edu/mda/7D/J50C/--/HXH?timewindow=2013/09/04%2002:00:00-2014/06/30%2018:00:00>**). 
The units are in Pascals and should be corrected by adding the seafloor 
pressure in Pa, found in a Channel Comment field of the metadata. We may 
change how this is implemented to be consistent with SEED convention in 
the future, and we will make an OBSIPtec announcement at that time.**
*/
/
/2. I am seeing potential 'artifacts' in some of the pressure data - 
i.e., an instantaneous offset that happens in between data points in 1 
minute sampled data.  Not 'geophysically feasible'.   Have these 
artifacts been noted previously?//

/*It is difficult to answer this with the given information. Could you 
send a sample of the 1 Hz data you are using that shows the problem? *
/
/
/3. Some of the data downloads from the Lamont instruments (the only 
ones we are interested in) are incomplete, that//
/
/is the download only goes so far (i.e., 3 months) and then stops. 
Multiple attempts at downloading always stop at//
/
/the same time.

/*Please let me know which stations you are downloading and which data 
request tool you are using and I will follow up on this.

*Cheers,
Kasey

On 9/26/15 3:09 PM, Paul Johnson wrote:
> Kasey;
>
> Your e-mail was timely - we are working with the Cascadia Initiative 
> data, as we speak.  So the correct location
> for M08C is very useful.
>
> 1. Can you tell me the units used for pressure on the Lamont 
> instruments?   I am assuming pascals, but I don't
> see them written down anywhere.
>
> 2. I am seeing potential 'artifacts' in some of the pressure data - 
> i.e., an instantaneous offset that happens in between data points in 1 
> minute sampled data.  Not 'geophysically feasible'.   Have these 
> artifacts been noted previously?
>
> 3. Some of the data downloads from the Lamont instruments (the only 
> ones we are interested in) are incomplete, that
> is the download only goes so far (i.e., 3 months) and then stops. 
> Multiple attempts at downloading always stop at
> the same time.
>
> I can send you examples of these, but I am not sure if you are the 
> right person.  But your e-mail says to ask.
>
> Hopefully,
>
> Paul Johnson
>
> Paul Johnson
> School of Oceanography
> Box 357940
> University of Washington
> Seattle, 98195-7940
> office phone: 206-543-8474
>
> On Sat, Sep 26, 2015 at 12:00 PM, 
> <obsiptec-request at iris.washington.edu 
> <mailto:obsiptec-request at iris.washington.edu>> wrote:
>
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>     Today's Topics:
>
>        1. Cascadia Year 3 Station 7D.M08C (Kasey Aderhold)
>
>
>     ----------------------------------------------------------------------
>
>     Message: 1
>     Date: Fri, 25 Sep 2015 18:22:29 -0400
>     From: Kasey Aderhold <kasey at iris.edu <mailto:kasey at iris.edu>>
>     To: obsiptec at iris.washington.edu <mailto:obsiptec at iris.washington.edu>
>     Subject: [OBSIPtec] Cascadia Year 3 Station 7D.M08C
>     Message-ID: <5605C925.5090803 at iris.edu
>     <mailto:5605C925.5090803 at iris.edu>>
>     Content-Type: text/plain; charset=utf-8; format=flowed
>
>     OBSIP user community,
>
>     An error in the longitude of station M08C in the Cascadia Year 3 data
>     [network code 7D] has been corrected and the metadata was reloaded at
>     the IRIS DMC on 9/16/2015.  Please let me know if you have any
>     questions.
>
>     This is also a good time for a reminder that if you have any questions
>     or concerns about OBSIP data, I encourage you to contact me. If we
>     cannot get to them immediately, we will still track and revisit any
>     issues brought forward.
>
>     Cheers,
>     Kasey
>
>     --
>     Kasey Aderhold
>     Project Associate | IRIS OBSIP Management Office
>     202-682-2220 x163 <tel:202-682-2220%20x163> | kasey at iris.edu
>     <mailto:kasey at iris.edu>
>
>
>
>     ------------------------------
>
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>
>     End of OBSIPtec Digest, Vol 17, Issue 3
>     ***************************************
>
>
>
>
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-- 
Kasey Aderhold
Project Associate | IRIS OBSIP Management Office
202-682-2220 x163 | kasey at iris.edu

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