Trends in the Development of SST

The yearly mean SSTs of the Baltic Sea of the investigation period from 1990 to 2005 show a slight positive trend in the mean temperature development in the entire Baltic Sea with an increase of approximately 0.97K in the period of 16 years (Fig. 9.6). This trend corresponds to the findings in the EEA Report (2004) with an increase of 0.5K in the past 15 years. 

The data of the spring combining March, April, and May do not reflect the temperature development of the yearly means. The highest positive anomalies of +1.1K and -I-0.75K 

FIGURE 9.6 Development of yearly mean SST of the Baltic Sea in the period 1990-2004 with long term means, anomalies and trend. 

FIGURE 9.7 Anomalies of the yearly and seasonal mean temperatures of the entire Baltic Sea with regards to the mean values calculated for the period 1990-2005 (a) mean, (h) spring, (c) summer, (d) autumn, (e) winter. 

January Februgty March April May June Jnly August September October November December FIGURE 9.8 Slope of trends of different months (1990-2005, upper panel) in regions Mecklenburg Bight (3), Arkona Sea (6), Gotland Sea (15), Bothnian Sea (19), and Bothnian Bay (23). 

---