Estonian EMEP Assessment Report
Estonian EMEP Assessment Report
Estonian EMEP Assessment Report
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Contribution from: Estonia<br />
Table 4. Significant downward trends in precipitation during the period of 1994-2000<br />
SO4 - S NH4 – N NO3 - N K Cl Na<br />
EE09-Lahemaa * + ** + * *<br />
EE11-Vilsandi ** * *<br />
** trend is significant at the level of 0.01<br />
* trend is significant at the level of 0.05<br />
+ trend is significant at the level of 0.1<br />
Figure 5 depicts the variation of S and N compounds at <strong>EMEP</strong> stations of Estonia.<br />
The trend is especially remarkable for sulphate where concentrations fall about twice at both stations.<br />
1,6<br />
1,4<br />
1,2<br />
1,0<br />
0,8<br />
0,6<br />
0,4<br />
0,2<br />
0,0<br />
Vilsandi SO4-S Sen's estimate<br />
LahemaaSO4-S Sen's estimate<br />
1994 1995 1996 1997 1998 1999 2000 2001<br />
Figure 5. Variation and trends (Sen’s estimate) in concentration of S (left) and N (right) compounds<br />
and at Lahemaa and Vilsandi.<br />
The trend of pH values is presented on Figure 6. When at Vilsandi pH is increasing, at Lahemaa we can<br />
observe a slightly opposite trend.<br />
5,2<br />
5,1<br />
5<br />
4,9<br />
4,8<br />
4,7<br />
4,6<br />
4,5<br />
4,4<br />
4,3<br />
4,2<br />
Vilsandi Sen's estimate<br />
Lahemaa Sen's estimate<br />
1994 1995 1996 1997 1998 1999 2000 2001<br />
0,6<br />
0,5<br />
0,4<br />
0,3<br />
0,2<br />
0,1<br />
0,0<br />
Vilsandi NH4-N Sen's estimate<br />
Vilsandi NO3-N Sen's estimate<br />
Lahemaa NH4-N Sen's estimate<br />
Lahemaa NO3-N Sen's estimate<br />
67<br />
1994 1995 1996 1997 1998 1999 2000 2001<br />
Figure 6. Variation and trends (Sen’s estimate)<br />
in pH of precipitation at <strong>EMEP</strong> stations.
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