EDMODnet Chemistry, Baltic Sea - Oxygen, Chlorophyll and contaminants - General issues Magnus Wenzer, Lotta Fyrberg, Örjan Bäck Swedish Meteorological and Hydrological Institute - SMHI

The Baltic Sea region

Latest dataset for the Baltic Sea OxygenChlorophylDepth Total number of profiles Total number of profiles (1990-) Number of profiles with bad or suspicious data

Distribution of profiles by EDMO-code (O2 and Chl-a)

Handling of the dataset  Zip-files with ODV-files and metadata csv-file  Import into ODV, SeadDataNet formats…  Different collections  Merge collections  Aggregation to P35

ODV import ~ profiles Missing value -999 (converted)

ODV Quality control of dataset (O2, Chl-a)  Many depths with flag 0  Wrong depth (below seafloor)  Sweden has reported negative O2 (calculated from H2S)  -999 as missing value  Wrong or invalid P01 codes

Oxygen

Chlorophyll-a

DIVA input  Periods: Ten years running average from 1960 (start) to 2014 (end)  Seasons: Winter (December - February) Spring (Mars - May) Summer (June - August) Autumn (September - November)  Depths: HELCOM standard depths, (0-30 for chl?)  Quality flags: 1, 2, 6  Weighting option is applied  All negative values set to 0  Overlap data from the North Sea dataset added

Oxygen, winter, 0m

Oxygen, winter, 0m

Oxygen, winter, 0m

Oxygen, summer, 0m

Oxygen, summer, 50m

Oxygen, summer, 100m

Oxygen, autumn, deepest

Contaminants  A lot of variables  Many files with incorrect formats.  How to report contaminants in biota (primary variable)?  Depth profiles - With depth = 0  Time series - Best option today even if only on occasions  No “valid” primary variable

Main issues in results and workflow  A lot of variables. Risk of missing variables during aggregation if P01 not mapped to P35.  Choice of primary variable  Check and validate ODV files  Diva on oxygen without negative values. Not sure if anoxia is shown correctly.  Very time consuming to check all Diva products. Feedback is appreciated.  Diva settings – different results (correlation length etc.). Feedback is appreciated.

Test ODV-files, import in ODV Import > SeaDataNet Formats… Import > ODV Spreadsheet (or drag- and-drop) Import > SeaDataNet Formats…

Ongoing work  Run Diva on chlorophyll – Not sure about the coverage  Test Diva “from bottom” on oxygen  Send ODV Spreadsheet Files to MARIS  Upload nc-files to ftp  Create xml-files and upload to Sextant  Update old xml-files  Contaminants  Feedback to originators

Earlier work

Nitrate

Phosphate

Silicate

Diva examples, Phosphate, Spring, 0m

Diva examples, Phosphate, Summer, 0m

Diva examples, Phosphate, Autumn, 0m

Diva examples, Silicate, Spring, 0m

Diva examples, Silicate, Summer, 0m

Diva examples, Silicate, Autumn, 0m