EDMODnet Chemistry - DIVA Products from the Baltic Region

Örjan Bäck, Lotta Fyrberg, Martin Hansson, Magnus Wenzer Swedish Meteorological and Hydrological Institute - SMHI

The Baltic Sea region

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)

Distribution of ODV-files

EDMO-code Country Nr. profiles Institution39 372 ----------------------------------------------------

729 Danmark 5 869 Aarhus University, Department of Bioscience, Marine Ecology Roskilde713 Estonia 7 (1717) Marine Systems Institute at Tallinn University of Technology

1725 Finland 3 607 Finnish Meteorological Institute (FMI)698 Latvia 763 Latvian Institute of Aquatic Ecology193 Poland 2 638 Institute of Meteorology and Water Management, Maritime Branch in Gdynia (IMWM MB)681 Russia 488 World Data Centre (RIHMI-WDC) National Oceanographic Data Centre (NODC) (RIHMI-WDC)545 Sweden 21 277 Swedish Meteorological and Hydrological Institute (SMHI)100 Germany 1 007 Baltic Sea Research Institute Warnemuende (IOW)993 Germany 1 931 State Agency for Environment, Nature and Geology, Mecklenburg-Vorpommern

1181 Germany 1 228 State Agency for Nature and Environment of Schleswig Holstein (LANU)1850 Germany 37 Federal Maritime and Hydrographic Agency (BSH)2537 Germany 367 State Office for Agriculture, Environment and Rural Areas of Schleswig Holstein (LLUR)3076 Germany 56 Leibniz Institute for Baltic Sea Research, Warnemünde (IOW)3234 Germany 97 PANGAEA - Data Publisher for Earth & Environmental Science (PANGAEA)

Total

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)

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

Driver setup (summary of individual DIVA runs)Data extraction: 1 do it, 0 do nothing, -1 press coord, -10 pressure+Saunders1boundary lines and coastlines generation: 0 nothing, 1: contours, 2: UV, 3: 1+2 1cleaning 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.0Parameters estimation and vertical filtering: -3 (correlation length and SN ratio parameters are to be estimated and vertically filtered)Minimal L0.1Maximal L3Minimal SN0.1Maximal SN20Analysis and reference field:1 (analysis fields of the given variable are to be performed for all the layers)lowerlevel number1upperlevel number44D netcdf files genaration:1gnuplot plots: 0 or 10Data detrending: number of groups, 0 if no detrending.1 (remove any trends in the data before analysis)

DIVA product examples (first run…)

Masked with error field of 0.2 Plots generated in Diva python tool

NOx-N, 0m

NOx-N, 0m

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

NO3-N (when NO2-N present)

NH4-N, 50m

NH4-N, 100m

Tot-N, 0m

Error field: Tot-N, 0m

why??

PO4-P, 0m

SiO3-Si,

Error field: SiO3-Si, 0m

why??

Oxygen, 50m

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.

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???

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 scheme when aggregating. Might have lost information/ profiles (flag 6)

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)