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# Data processing after Poseidon cruise POS519
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All data can be found on GEOMAR's data portal


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## CTD data 
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The CTD data (temperature, salinity, oxygen) were processed and calibrated by Gerd Krahmann. The single casts are found in the zip folder pos_519_1_ctd_rel1.zip.

all data measured from the niskin bottles can be found in the file "POS519_niskin_data.txt". I used quality flags according to 
WOCE standards:
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flag | meaning
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:---: | :---:
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2 | good
3 | questionable
4 | bad
5 | unknown/raw
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The file will be updated as new data come available. The content is:
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variable | unit | description | additional notes
:--- | :--- | :--- | :---
profile no. |	| number of CTD cast |
niskin no.	| | niskin bottle number |
sample no. | | sample identifier as used on board |
latitude | deg N | |
longitude | deg E | |
Date  | UTC | |
Time  | UTC | |
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pressure | dbar | CTD pressure reading in dbar | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
temperature | degC | CTD temperature reading | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
salinity | | calculated CTD salinity | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
oxygen sensor | µmol/kg | Oxygen concantration as recorded by the CTD sensor. The data are calibrated with Winkler titrated samples. | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
chl2_raw | | flourescence from Wetlabs Fluorometer (serial # FLNTURTD-2928) | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
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chlorophyll a | µg/L |	calculated chlorophyll concentration using | [calibration coefficents from Wetlabs](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/FLNTURTD-2928.Charsheet-1.pdf)
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potential density | kg/m3 | | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
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oxygen titrated | umol/kg | oxygen concebtration determined by Winkler titration on board |
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turb_raw | | turbidity data raw from Wetlabs fluorometer  | [info](https://git.geomar.de/tobias-steinhoff/Poseidon-POS519/blob/master/data%20processing/docs/pos_519_1_report.txt)
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NO3 | µM/L |	nitrate concentration, calibration solution was too low, so some samples are off scale -> QF=3 |
NO2 corr. | µM/L | nitrite concentration  |
PO4 | µM/L| phospate concentration, calibration solution was too low, so some samples are off scale -> QF=3  |
SiO2 | µM/L | silicate concentration	 |
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