1. Pirkko Kauppila (FI), Andres Jaanus (EE) & Jakob Walve (SE)
Intercalibration of chlorophyll a in BC1 and BC3, the northern Baltic Sea
Pirkko Kauppila (FI), Andres Jaanus (EE) & Jakob Walve (SE)
ECOSTAT meeting
Ispra, March 20, 2012

2. Common types: BC1 & BC3 Sweden BC1 BC1: The Quark and the Bothnian Sea
BC3: Outer parts of the Askö archipelago (SE), the Archipelago Sea FI) and the western Gulf of Finland (FI and EE).
Finland
BC3
BC3
Estonia

3. Note differences in depth relationships!

4. IC of chlorophyll a between FI and SE in BC1 in the Bothnian Sea and the Quark

5. Comments from JRC for BC1
Univariate test of Signif. for log Chl
Based on GLM, the data did not reveal significant difference between FI and SE.
EQR needs to be measured as a distance from the same reference value (mean value = 1.3 µg L-1).
FI and SE have different boundary setting in Option 1, meaning that compliance checking was needed. SS
Freedom MS F p
Intercepth
0.57 1
3.26
0.075
Log TN
0.79
4.54
0.036
0.08
0.45
0.51
Error
11.8 68
0.17

6. Harmonized class boundaries in BC1 between SE and FI
µg L-1
EQR
Ref
H/G
G/M
M/P
P/B FI
1.3
2.0
2.2
3.3
6.5
0.65
0.59
0.4
0.2 SE
1.5
0.87
Finnish class boundaries are a little bit higher mainly due to differences in depth relationships, surface temperatures in July to August, and the main direction of surface currents.
Comment from JRC:
”You can keep your proposed chlorophyll concentrations but you have to translate these into different EQR values.”

7. IC of chlorophyll a between FI and EE in BC3 in the outer parts of Archipelago Sea and the western Gulf of Finland

8. Comments from JRC for BC3
BC3 between FI and EE
Parameter estimates (FI & EE)
There is a significant difference between FI and EE.
FI has 0.48 µg L-1 less Chl than EE for the same TN.
At a reference value of 1.8 mg L-1 of EE, FI should get 1.32 µg L-1.
Level of effect
Chl param.
Chl STD.ERR
Chl - t
Chl - p
Intercept
1.55
0.55
2.80
0.005
TN, µMolL-1
0.25
0.02
10.6
0.00 MS FI
0.48
0.13
3.79

9. Harmonized class boundaries in BC3 between FI and EE
µg L-1
EQR
Ref
H/G
G/M
M/P
P/B FI
1.3
1.75
2.2
3.3
6.6
0.75
0.59
0.40
0.20 EE
1.8
2.7
4.5
8.8
0.82
0.67
Comment from JRC:
The highest FI can go for G/M boundary is 2.24 µg L-1.

10. IC of chlorophyll a between FI, EE and SE in BC3 in the outer parts of Archipelago Sea, the western Gulf of Finland and Askö archipelago