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EDMODnet Chemistry - DIVA Products from the Baltic Region

Örjan Bäck, Lotta Fyrberg, Martin Hansson, Magnus Wenzer Swedish Meteorological and Hydrological Institute - SMHI . EDMODnet Chemistry - DIVA Products from the Baltic Region. The Baltic Sea region. Aggregations of parameters.

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EDMODnet Chemistry - DIVA Products from the Baltic Region

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  1. Örjan Bäck, Lotta Fyrberg, Martin Hansson, Magnus Wenzer Swedish Meteorological and HydrologicalInstitute - SMHI EDMODnet Chemistry - DIVA Products from the Baltic Region

  2. The Baltic Sea region

  3. Aggregations of parameters • Parameters: Tot-N, NO3-N (when NO2-N present), NOX-N, NH4-N, Silicate, Tot-P, PO4-P,Chlorophyll-a, Oxygen, pH • 208 parameters (data are missing, see. Conclusions) • 39 372 profiles in total (prior to QC) • 30 804 profiles from 1990 and onward (prior to QC)

  4. Distribution of ODV-files

  5. ODV Quality control of dataset • Visual and manual quality control • Range • Spikes • Position • Ratio • Need a common standard or guideline (which is about to be developed)

  6. DIVA product setup (first run…) Analysis parameters and options • Year list: 1990 – 2012 • Month list: January-February, July-August (Monthly will be tested…) • Var list: Tot-N, NO3-N (when NO2-N present), NOX-N, NH4-N, Silicate, Tot-P, PO4-P,Chlorophyll-a, Oxygen, pH • Countour depth: 0, 20, 50, 100 meters (HELCOM standard depth will be tested…) • Qf list: 1,0,(7) (ODV QF-scheme) Param.par Ispec (error output) : 101, clever poor man’s error estimate, gridded error field. Ireg (background field): 1, data mean subtracted

  7. Driver setup (summary of individual DIVA runs) Data extraction: 1 do it, 0 do nothing, -1 press coord, -10 pressure+Saunders 1 boundary lines and coastlines generation: 0 nothing, 1: contours, 2: UV, 3: 1+2 1 cleaning data on mesh: 1, 2: RL, 3: both, 4: 1 + outliers elimination, 5: =4+2 5 (cleaning data on mesh + outliers elimination + generation of relative length fields) minimal number of data in a layer. If less, uses data from any month. 0 Parameters estimation and vertical filtering: -3 (correlation length and SN ratio parameters are to be estimated and vertically filtered) Minimal L 0.1 Maximal L 3 Minimal SN 0.1 Maximal SN 20 Analysis and reference field: 1 (analysis fields of the given variable are to be performed for all the layers) lowerlevel number 1 upperlevel number 4 4D netcdf files genaration: 1 gnuplot plots: 0 or 1 0 Data detrending: number of groups, 0 if no detrending. 1 (remove any trends in the data before analysis)

  8. DIVA product examples (first run…) • Masked with error field of 0.2 • Plots generated in Diva python tool

  9. NOx-N, 0m

  10. NOx-N, 0m

  11. NO3-N (when NO2-N present), 0m

  12. NO3-N (when NO2-N present)

  13. NH4-N, 50m

  14. NH4-N, 100m

  15. Tot-N, 0m

  16. Error field: Tot-N, 0m why??

  17. PO4-P, 0m

  18. SiO3-Si,

  19. Error field: SiO3-Si, 0m why??

  20. Oxygen, 50m

  21. pH • The results for pH ranged far from expected values. • We found that that the pH had been analyzed as phosphate. • In DIVA var list: Aggregated_pH is the same as Aggregated_Phosphate • Unfortunately, there were no time for re-run of DIVA.

  22. Conclusion of first run (data set quality and preprocessing problems) • Provided data • Profiles with no “Depth”-variable: • Only “Min depth” and “Max depth” • Chlorophyll a: point average • Profiles with mismatching semantic header and header • Profiles with position (0,0) • Control system for those kinds of errors? • Some data with bad prior QC (also CDI-link not working: “We are sorry, but the requested CDI data set reference can not be found at present. Activities are on-going for correcting this issue.”) • Request the whole data set again???

  23. Conclusion of first run (data set quality and preprocessing problems) • Mapping and ODV: • Problems with confusing parameter codes in P01 and P02. For example NTOT (P02) is PON (led to incorrect aggregation) • Parameter is not imported into ODV (NTOT). Seems to be working better with newest ODV-version (alpha version 6.4.3) provided by Reiner Schlitzer. • Change of flag schemewhenaggregating. Might have lost information/ profiles (flag 6)

  24. Conclusion of first run (DIVA) • DIVA product generation: A protocol is needed to set the options and setting that should be general for all regions. • The should be a discussion about options and setting that must be region specific. • Use Jan-Feb, Mars-May, June-August, Sept-Okt, Nov-Dec. ok? To avoid mixing data before and after spring/autumn bloom, etc. • Be aware: In DIVA var list Aggregated_pH is the same as Aggregated_Phosphate • Diva products for NOX-N, NH4-N, PO4-P, Tot-P, Oxygen are OK • More work is needed for Tot-N, SiO3-Si, pH, Chlorophyll-a, NO3-N (when NO2-N is present)

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