ITEM 4 Common Workplan items ICP Waters ECE/EB.AIR/WG.1/2010/6

WGE 29th session, September 2010

1Brit Lisa Skjelkvåle

ITEM 4 Common Workplan items

ICP WatersECE/EB.AIR/WG.1/2010/6



1. Targets and ex-post application

• MAGIC modeling of calibrated sites in Norway and Czech rep, possible also some other countries

• Relate results to possibilities for biological recovery (increase in ANC)

• Use long-term monitoring data on water chemistry and biota when possible

• Present results for discussions at JEG-meeting in late October



2. Robustness

• There is generally good agreement between exceedence of critical load for acidity and the acid neutralizing capacity (ANC) in surface waters.

Exceedance of Critical loads of acidity vs measured ANC at ICP Waters sites in Europe 1990

-300

-200

-100

0

100

200

300

-500 -250 0 250 500

exceedance meq/m2/yr

AN

C µ

eq/l

Critical load of acidity is exceeded

Critical load of acidity is not

exceeded

ANC limit = 20 µeq/L

• Exceptions are sites with time delays between changes in S+N deposition and response in water chemistry.

• Time delays are well explained by known processes in catchments and waters, and can be modelled



2. Robustness

• There is also good agreement between chemical criteria (ANC) and biological response



3. Links with biodiversity• The major effect from S- and N-deposition on

aquatic ecosystems is the loss of biodiversity. • 10 000 stocks of brown trout, roach, Arctic

char, and perch, have recently disappeared from Fennoscandian lakes (Tammi, 2003).

• A major part of the invertebrate fauna is also lost in acidifiedlakes and rivers due to acidification.

• Recovery of the biodiversity has begun in many regions, but lags behind chemical recovery.



3. Links to biodiversity;Areas with lost or damaged fish

populations due to acid rain



0

10

20

30

40

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

no

. Sp

ecim

ens

Mayfly Baetis rhodani

-40

-20

0

20

40

µeq

/l

ANClimit

ANC

Water chemistry

0

10

20

30

40

CP

UE

Fish

Lake Saudlandsvatn

0

50

100

150

200

250

meq

/m2/

yr

CLA

SO4*

Deposition

Deposition water chemistry biota (fish and inverterates)

3. Links to biodiversity;

recovery of fish and

ivertebrates due to redusced

S-deposition



4. Trends in selected monitored/modeled parameters



ESO4* 1990-1999

NoN SoN UK WCE ECE Alps Ma/AtlVt/Que Adk Apps BRi Ont

Slo

pes

(E

q/L

/yr)

-15

-10

-5

0

5

ESO4* 1999-2008


4. Trends in selected monitored/modelled parameters

Trends in sulphate; 1990-1999, 2000-2009

• Still decreasing sulphate trends in most regions, but trends are slower rate



4. Trends in selected monitored/modelled parameters

Trends in ANC; 1990-1999, 1999-2008

ANC 1990-1999


Slo

pes

(E

q/L/

yr)

-10

0

10

20

30

ANC 1999-2008


• Still increasing trends in ANC but at a lower rate than in the 90’ies



4. Trends in selected monitored/modelled parameters -trends in biota (invertebrates)

Farsund

0,0

0,2

0,4

0,6

0,8

1,0

81 83 85 87 89 91 93 95 97 99 01 03 05 07 09

Indeks

Vikedal

0,0

0,2

0,40,6

0,8

1,0

81 83 85 87 89 91 93 95 97 99 01 03 05 07 09Indeks

Gaular

0,0

0,2

0,40,6

0,8

1,0

81 83 85 87 89 91 93 95 97 99 01 03 05 07 09

Indeks

Ogna

0,0

0,2

0,40,6

0,8

1,0

81 83 85 87 89 91 93 95 97 99 01 03 05 07 09

Indeks

Nausta

0,0

0,2

0,4

0,6

0,8

1,0

81 83 85 87 89 91 93 95 97 99 01 03 05 07 09

Indeks

• Increasing trends, but at a lower rate in recent years compared to the 90’ies

ITEM 4 Common Workplan items ICP Waters ECE/EB.AIR/WG.1/2010/6

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