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North Sea Data Revisit: Aggregated Analytical Methods for Comprehensive Nutrient Mapping

Explore the updated North Sea data with aggregated nutrient methods for accurate mapping. Discover trends and patterns in nutrient levels over decades. Further optimization and potential inclusion of non-EMODNET data for enhanced insights await. Stay tuned for new updates!

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North Sea Data Revisit: Aggregated Analytical Methods for Comprehensive Nutrient Mapping

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  1. North SEA QA and DIVA

  2. Re-visit of North SEAdata • 939.970 stations (~2% removed as duplicates/non-target institutions) • 7 Nutrients • With 20–28 different methods/units each!

  3. Data handling so far • All individualnutrientmethodsaggregated 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 ifnothingelse NO3 • NOxchecked for <0 values, changed to 0 • CheckedifNOx + NH4 >TN • Checkedif PO4>TP • Generated DIVA maps for PO4 all decades (redone) • Generated DIVA maps for all nutrients 2000-2014

  4. QA: N • IN > TN • 2 2x> • 9 10%> • 37 <10% • 1850: • 2011 x3 • 1181 • 2005 x1 • 729 • The rest • 120084 NH4+NOx+TN datapoints

  5. 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

  6. DIVA for PO4 decades • 1970ies –DISREGARD theBaltic, no data

  7. DIVA for PO4 decades • 1980ies

  8. DIA for PO4 decades • 1990

  9. DIVA for PO4 decades • 2000s

  10. DIVA for PO4 decades • 2010s

  11. DIVA for 2000-14 nOx • Vinter Summer

  12. DIVA for 2000-14 nOx • Summer Errorfield

  13. DIVA for 2000-14 nOx • Vinter Errorfield

  14. DIVA for 2000-2014 PO4 • Vinter Summer

  15. DIVA for 2000-2014 TP • Vinter Summer

  16. Testing Diva parameters • DIVA auto-optimisationused (with some problems) • Suggests correlationlengthshouldbe smaller than 1 degree • Correlation length:1 or 0.5 similar, • 0.15 – 0.30 not possibletoofew data?

  17. Next on the to-do list • Waiting for new data! • Optimisingfurther on DIVA parameters • Separate DIVA for Norwegian and Celtic Seas • Check on availability of TP data in UK • Possibility to includesome of the non-EMODNET data?

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