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MARTIN M. LARSEN + JONAS KOFOED RØMERPHD QA COORDINATOR + GIS SPECIALIST
3.. SEPT 2014
NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
NORTH SEA QA AND DIVA
NORTH SEAMARTIN M. LARSEN
3. SEPT 20142
RE-VISIT OF NORTH SEADATA›939.970 stations (~2% removed as duplicates/non-target institutions)
›7 Nutrients› With 20–28 different methods/units each!
NORTH SEAMARTIN 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
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NORTH SEAMARTIN 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 datapoints4
NORTH SEAMARTIN 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
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR PO4 DECADES
›1970ies –DISREGARD the Baltic, no data
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR PO4 DECADES
›1980ies
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIA FOR PO4 DECADES
›1990
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR PO4 DECADES
›2000s
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR PO4 DECADES
›2010s
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR 2000-14 NOX
›Vinter Summer
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR 2000-14 NOX
›Summer Error field
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR 2000-14 NOX
›Vinter Error field
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR 2000-2014 PO4
›Vinter Summer
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NORTH SEAMARTIN M. LARSEN
3. SEPT 2014
DIVA FOR 2000-2014 TP
›Vinter Summer
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NORTH SEAMARTIN 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?
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NORTH SEAMARTIN 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?
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