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North SEA QA and DIVA

North SEA QA and DIVA. Re-visit of North SEAdata. 939.970 stations (~2% removed as duplicates/non-target institutions) 7 Nutrients With 20–28 different methods/units each!. Data handling so far. All individual nutrient methods aggregated to µM Non-EMODNET data and QF>1 excluded (~2%)

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North SEA QA and DIVA

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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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