1. MARTIN M. LARSEN + JONAS KOFOED RØMER PHD QA COORDINATOR + GIS SPECIALIST 3.. SEPT 2014 NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 NORTH SEA QA AND DIVA

2. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 RE-VISIT OF NORTH SEADATA ›939.970 stations (~2% removed as duplicates/non-target institutions) ›7 Nutrients ›With 20–28 different methods/units each! 2

3. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DATA HANDLING SO FAR ›All individual nutrient methods aggregated to µM ›Non-EMODNET data and QF>1 excluded (~2%) ›PO4 checked for <0 values, changed to 0 ›NO2+NO3 aggregated with NO23 and NO3 as NOx ›NO23, then NO2+NO3 if nothing else NO3 ›NOx checked for <0 values, changed to 0 ›Checked if NOx + NH4 >TN ›Checked if PO4>TP ›Generated DIVA maps for PO4 all decades (redone) ›Generated DIVA maps for all nutrients 2000-2014 3

4. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 QA: N ›IN > TN ›2 2x> ›9 10%> ›37 <10% ›1850: ›2011 x3 ›1181 ›2005 x1 ›729 ›The rest ›120084 NH4+NOx+TN datapoints 4

5. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 QA: P ›OP > TP ›7 2x> ›40 10%> ›131 <10% ›1850: ›2006 x10, 2007 x1 ›1181 ›2005 x7, 2001 x2 ›729 ›The rest ›149170 datapoints 5

6. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR PO4 DECADES ›1970ies –DISREGARD the Baltic, no data 6

7. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR PO4 DECADES ›1980ies 7

8. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIA FOR PO4 DECADES ›1990 8

9. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR PO4 DECADES ›2000s 9

10. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR PO4 DECADES ›2010s 10

11. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR 2000-14 NOX ›VinterSummer 11

12. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR 2000-14 NOX ›SummerError field 12

13. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR 2000-14 NOX ›VinterError field 13

14. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR 2000-2014 PO4 ›VinterSummer 14

15. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 DIVA FOR 2000-2014 TP ›VinterSummer 15

16. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 TESTING DIVA PARAMETERS ›DIVA auto-optimisation used (with some problems) ›Suggests correlation length should be smaller than 1 degree ›Correlation length:1 or 0.5 similar, ›0.15 – 0.30 not possible too few data? 16

17. NORTH SEA MARTIN M. LARSEN 3. SEPT 2014 NEXT ON THE TO-DO LIST ›Waiting for new data! ›Optimising further on DIVA parameters ›Separate DIVA for Norwegian and Celtic Seas ›Check on availability of TP data in UK ›Possibility to include some of the non-EMODNET data? 17