1. Annual Meeting, June 15-16 2015, Istanbul, Turkey WP2: Results and criticalities in the North Sea EMODnet Chemistry Regional leader: Aarhus University, AU-DCE Martin M. Larsen, DIVA by Jonas Kofoed Rømer

2. Annual Meeting, June 15-16 2015, Istanbul, Turkey Data contibuters: Current status EDMO CODENOxPO4SiO 28 (CEFAS)990988985 32 (The Environment Agency (EA)) 481753 43 (BODC)235241283762218896 486 (IFREMER)838948956 545 (SMHI)193772395916041 612 ( Norwegian Marine datacenter ) 8605 8604 681 (RIHMI-WDC) 103503127 729 (AU-DCE)627626297350141 1503 (was iFBM, Hamburg uni.) 80 0 1578 (was MUMM-BMDC) 213520432078 1725 (FMI) 14 2135 (Marine Scotland institute) 726472696667

3. Annual Meeting, June 15-16 2015, Istanbul, Turkey General overview of the data contribution: Current status NOxPO4SiO Total CDI’s (CTD+Nutrients) 640531 Individual nutrients 346555400535309421 All nutrients available 263916 Spatial distribution: - No data from Baltic - Area restricted to “central North Sea” - NOx=NO 2+3 or NO 3 +NO 2 or NO 3

4. Annual Meeting, June 15-16 2015, Istanbul, Turkey The worst case dataset SiO dataset

5. Annual Meeting, June 15-16 2015, Istanbul, Turkey DIVA production: Topography problems Gebco 2014 30 arc-seconds bathymetry used for contours (raises The Netherlands to +1 instead of underwater) Too finescaled, so only every 6 th grid used Depths used: 500, 100, 75, 50, 25, 20, 10, 5, 1 and 0. 4 Seasons: Winter 1101, spring 0204, summer 0507, autumn 0810. 46 Decades: one-year interval 1960 – 2006 (+10 years) Interpolation settings: CL=0.7, SNR= 1.0 Ref. field CL=3, SNR=0.1

6. Annual Meeting, June 15-16 2015, Istanbul, Turkey NOx Vinter-spring Summer-autumn

7. Annual Meeting, June 15-16 2015, Istanbul, Turkey NOx conclusions: Generally too few data in the central North Sea The first ”red” areas occurs around 1980 at Odense Fjord and in the Baltic [where no data should be available!] From mid 1980ies, full data coverage for 10 year periods [except winter months] Most coastline with river output red from 1990ies onward, nutrient rich stream along jutlandic coast from German Bight Winter and Autumn have the fewest datapoints, and hence the largest area with >0.5 relative error theshold Usually not NOx controlled system in the North Sea

8. Annual Meeting, June 15-16 2015, Istanbul, Turkey PO 4 Vinter-spring Summer-autum

9. Annual Meeting, June 15-16 2015, Istanbul, Turkey PO 4 conclusions: Winter data First yellow data in Bay of Aarhus, then the Channel Generally very low numbers in the central North Sea Generally more data available, but seems like more missing data than for NOx in the central/british side of the North Sea Less pronounced river inputs (except Thames, Holland)

10. Annual Meeting, June 15-16 2015, Istanbul, Turkey SiO Vinter-sping Summer-autumn

11. Annual Meeting, June 15-16 2015, Istanbul, Turkey SiO conclusions: Patterns not as clear cut from rivers as NO x and PO 4 Some increase in Bay of Aarhus and in the Channel Not so much from German rivers Generally significant less data and more areas masked due to high error.

12. Rerun of winter nutrients with new DIVA version (?) -Check timetrend more thoroughly -Portal upload. We need password for the ocean browser portal + xml metadata creation using divadoxml-gui. -No logit transform used yet, we have some negative values in the interpolated results. Should we logit transform? Run DIVA for O 2 and Chlorophyll data Check if enough Hazardous substance data to perform DIVA interpolation – No seasonality for sediment/biota samples – maybe on CHASE output to get highest possible spatial output for combined matrices Border problems with the Baltic (perhaps other areas?) + Baltic data? Annual Meeting, June 15-16 2015, Istanbul, Turkey Planning for the last year