1. Northern GIG - Organisation
Sweden (Swedish EPA coordinator), Finland, Norway, + UK, Ireland joined from 2004
Work started in 2002, funded by EPAs and supported by Nordic Council of Ministers
Collaboration between national EPAs and national research institutes (SLU Sweden, SYKE Finland, NIVA and NINA Norway, CEH UK)
Only rivers and lakes (coastal waters will IC with North- East Atlantic region or Baltic region)

2. Northern GIG – IC Options
Option 1 not realistic since the member states do not have the same classification system
Option 2 will be attempted for IC, using a combination of common metrics and national metrics. Test intercalibration in autumn 2004 for three lake types and three river types and some common metrics, and range of sites from high to poor/bad status.
Option 3 can also be used if the common metric approach fails.

3. Northern GIG – Lake types to be used for test IC (2004)
Type name
Pressure
Element
L-N1
Lowland, shallow, siliceous moderate alk. (0.2-1 meq/L)
Eutrophica-tion
Phyto-plankton
L-N3
Lowland, shallow, humic (> 30 mg Pt/L), low alk. (<0.2meq/L)
L-N5
Boreal, shallow, siliceous low alk. (<0.2 meq/L)
Acidification
Macroinvertebrates, fish

4. Northern GIG – River types to be used for test IC (2004)
Type name
Pressure
Element
R-N3
Lowland, small, siliceous low alk. (<0.2 meq/L), humic (>30 mg Pt/L)
Organic pollution (eutrophica-tion)
Macroinvertebrates
R-N4
Lowland, medium, siliceous moderate alk. (<0.2meq/L), clear
R-N5
Boreal, small siliceous low alk. (<0.2 meq/L), clear
Acidification

5. Northern GIG – Common metrics
Pressure
Element
Metric
Eutrophication (lakes)
Phytoplankton
Chlf.a, Biovolume, %blue-greens, Total P
Eutrophication /Organic loading
(rivers)
Macroinvertebrates
ASPT, DSFI, STAR/AQEM-metrics, BOD (?)
Acidification (rivers and lakes)
Raddum index, Medins index, STAR/AQEM? pH, alk, ANC
Acidification (lakes)
Fish
CPUE-index, % acid-sensitive species, pH, alk.,ANC