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Reply #11: A CTD rosette - the white tubes are Niskin bottles (you can see the caps cocked at the top) [View All]

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jpak Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Dec-10-11 09:56 AM
Response to Reply #6
11. A CTD rosette - the white tubes are Niskin bottles (you can see the caps cocked at the top)
The electrical cable running down the hydro-wire connects to a package of instruments that measure Conductivity (salinity) Temperature and Depth (hydrostatic pressure) - as well as oxygen sensors, flourometers (measures chlorophyll) and transmissometers (measure turbidity).

The Niskin bottles have caps attached to elastic bands or springs - the whole shebang is lowered through the water column and give a real-time picture of the water column.

The scientists look at the depth profile and trip the Niskin bottles at the depths they want. The bottles collect water at those depths and are brought to the surface for analysis.

and...I seriously doubt Ken is using this one for iron measurements - lol
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  -Fukushima ocean radiation could pose sleeper threat flamingdem  Dec-08-11 10:11 PM   #0 
  - Ya thimk??? Naaaah...  Karenina   Dec-09-11 05:54 PM   #1 
  - do pro-nucular science types know what that device is in the photo?  jpak   Dec-09-11 05:56 PM   #2 
  - I think the formal name is "A-BOPP"  FBaggins   Dec-09-11 06:21 PM   #3 
     - Nope  jpak   Dec-09-11 06:25 PM   #4 
        - No really. That's what it is.  FBaggins   Dec-09-11 06:33 PM   #5 
           - Close - it's a CTD rosette  jpak   Dec-10-11 12:02 AM   #7 
              - Sorry... no. A rosette doesn't have to have a CTD. Can you point to it?  FBaggins   Dec-10-11 09:03 AM   #8 
                 - The instruments are behind the Niskin bottles  jpak   Dec-10-11 09:45 AM   #9 
                    - And what are you basing that on?  FBaggins   Dec-10-11 09:49 AM   #10 
                       - My personal experience conducting thousands of CTD casts  jpak   Dec-10-11 09:57 AM   #12 
                          - And you've never seen or heard of a rosette without a CTD?  FBaggins   Dec-10-11 10:00 AM   #13 
                             - No - that would be stupid - how would you know where they were tripped?  jpak   Dec-10-11 10:02 AM   #14 
                                - The CTD is not the only device that can tell you the depth you're at.  FBaggins   Dec-10-11 10:07 AM   #15 
                                   - A rosette without a CTD package is useless - and you cannot do depth profile sampling  jpak   Dec-10-11 10:44 AM   #16 
                                      - Sorry. That's flat wrong.  FBaggins   Dec-10-11 01:25 PM   #17 
  - So what is dat ting? nt  flamingdem   Dec-09-11 07:14 PM   #6 
     - A CTD rosette - the white tubes are Niskin bottles (you can see the caps cocked at the top)  jpak   Dec-10-11 09:56 AM   #11 
 

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