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Tasks normally performed by volunteers after
training:
- CTD prep – draining and
rigging of CTD for deployment 20mins before station. Rosette
bottles are drained, bottom lanyards unclipped; once drained, all
valves are closed and rotated 90°; breathers are closed
(lightly finger-tight).
- CTD launching and recovery - help
untie the deck lines; handle tag lines to keep the package from
swinging during deployment; hook the CTD on recovery and help
land the CTD safely on deck; tie the CTD back down
- Sample Drawing –
- Refer to the sample log sheet for the bottle numbers
to sample. The number of samples and the bottle they start on
can vary - shallow stations have fewer bottles; others may have extra
bottles with additional samples to draw. Certain sample types
may not be drawn from all the bottles.
- Standard station samples drawn are:
- Oxygens – must be drawn first to minimize
contamination, usually by the CTD operator
- Salts – very sensitive
to fresh water contamination (ie rain) and evaporation
- Nutrients – very
sensitive to phosphates (soap residue on hands)
- Chl – volumetric, no
bubbles
- HPLC – volumetric,
filled completely; volume varies with chlorophyll concentration
- Phyto – “Pooh”
sample; formalin preserved, no rinses; usually by the CTD operator
- Prodo – Primary productivity C14 uptake
experiment, done at the noon station; samples drawn by the prodo person
- All sample containers (except the Phyto-Pooh sample)
require 3 rinses.
- Chl filtration – ~14
chlorophyll samples are taken to the Chl van and filtered asap (usually
during the Bongo net deployment)
- HPLC filtration –
usually done along with chl filtration but may take much longer to
complete because of larger volumes. Do not let the filters dry out.
- Net deployment & washdown
– launch, recover and washdown Pairovet, Manta, and Bongo
nets. Refer to the Fisheries Net Handbook for information on
net types.
- Zooplankton sample
“pickling” – formalin-preserve
net cod-ends. Let the Chief Scientist know if you are
sensitive to formalin or any other chemical.
- Secchi disc – deploy,
determine secchi depth, recover
- Chl sample analysis –
after 24+ hours of extraction, the chlorophylls can be measured on the
fluorometer during transits between stations.
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