item 4 common workplan items icp waters ece/eb.air/wg.1/2010/6
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ITEM 4 Common Workplan items ICP Waters ECE/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) - PowerPoint PPT PresentationTRANSCRIPT
WGE 29th session, September 2010
1Brit Lisa Skjelkvåle
ITEM 4 Common Workplan items
ICP WatersECE/EB.AIR/WG.1/2010/6
WGE 29th session, September 2010
2Brit Lisa Skjelkvåle
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
WGE 29th session, September 2010
3Brit Lisa Skjelkvåle
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
WGE 29th session, September 2010
4Brit Lisa Skjelkvåle
2. Robustness
• There is also good agreement between chemical criteria (ANC) and biological response
WGE 29th session, September 2010
5Brit Lisa Skjelkvåle
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.
WGE 29th session, September 2010
6Brit Lisa Skjelkvåle
3. Links to biodiversity;Areas with lost or damaged fish
populations due to acid rain
WGE 29th session, September 2010
7Brit Lisa Skjelkvåle
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
WGE 29th session, September 2010
8Brit Lisa Skjelkvåle
4. Trends in selected monitored/modeled parameters
WGE 29th session, September 2010
9Brit Lisa Skjelkvåle
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
NoN SoN UK WCE ECE Alps Ma/AtlVt/Que Adk Apps BRi Ont
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
WGE 29th session, September 2010
10Brit Lisa Skjelkvåle
4. Trends in selected monitored/modelled parameters
Trends in ANC; 1990-1999, 1999-2008
ANC 1990-1999
NoN SoN UK WCE ECE Alps Ma/AtlVt/Que Adk Apps BRi Ont
Slo
pes
(E
q/L/
yr)
-10
0
10
20
30
ANC 1999-2008
NoN SoN UK WCE ECE Alps Ma/AtlVt/Que Adk Apps BRi Ont
• Still increasing trends in ANC but at a lower rate than in the 90’ies
WGE 29th session, September 2010
11Brit Lisa Skjelkvåle
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