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

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

3

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

5

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR PO4 DECADES

›1970ies –DISREGARD the Baltic, no data

6

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR PO4 DECADES

›1980ies

7

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIA FOR PO4 DECADES

›1990

8

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR PO4 DECADES

›2000s

9

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR PO4 DECADES

›2010s

10

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR 2000-14 NOX

›Vinter Summer

11

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR 2000-14 NOX

›Summer Error field

12

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR 2000-14 NOX

›Vinter Error field

13

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR 2000-2014 PO4

›Vinter Summer

14

NORTH SEAMARTIN M. LARSEN

3. SEPT 2014

DIVA FOR 2000-2014 TP

›Vinter Summer

15

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?

16

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?

17