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KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

FI-I-3: Occurrence of thermophilic species in inland waters – case study

The picture shows two men in waterproof working clothes standing in a small boat on Lake Constance. One of them is holding a fishing net. He seems to be pulling it out of the water. In the background, the lakeshore and a settlement are visible.

… reduction in the phosphorus content of Upper Lake Constance, the hot summer of 2003 led to an explosive increase in carp as a thermophilic species. In particular … would exist in such lakes. Therefore, the surprisingly strong presence of carp in 2003 is obviously due to particularly warm conditions in the spring and summer of … As a result of favourable conditions caused by higher temperatures prevailing in 2003, subsequent years saw the highest carp yields ever recorded since the …

KomPass: Article from 28.11.2023 | Last changed: 11.12.2024

GE-I-2: Heat-related mortalities

The picture shows an elderly woman wearing a white blouse. The lady is holding on to a rollator with one hand, while she is holding the back of her left hand to her forehead. In the background, a few fuzzy treetops or bushes are visible in bright light.

… with its persistent searing heatwave was lower than the ‘summer of the century’ in 2003. This may have been an effect resulting from preventative measures. GE-I-2: … there were – also in summer 2018 – fewer heat-related mortalities than in summer 2003. Presumably, this is because people in Germany have since learned how to cope … health services are likely to have contributed to this positive development. In 2003, the heatwave in Germany hit a relatively ill-prepared country. By comparison, …

KomPass: Article from 28.11.2023 | Last changed: 12.12.2024

LW-I-2: Yield fluctuations

The picture shows the soil of a cereal field, with large cracks caused by drought.

… phases might be vulnerable to weather patterns. In the hot and dry year of 2003, the wheat yield amounted to 65.5 dt / ha which was 14.6 % below the mean yield … the yields. In respect of maize, the hot and dry weather pattern in July and August 2003 triggered premature ripening in many locations which enforced early harvesting. … for 2018, amounting to 67.7 dt / ha – that is higher than the total of yields for 2003. However, compared to the extraordinary wheat yields of the years of 2013 to …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

GE-I-6: Contamination of bathing waters by cyanobacteria burdens

The picture shows the palm of a hand stroking the surface of a water body.

… data can be validated by individual surveys carried out in situ. For the years from 2003 to 2011 and from 2016 onwards, suitable satellites were available. In the years … associated with stable stratification. For example, in the hot summer of 2003, the summer stratification was distinctly less stable than in 2006 – a year in … data can be validated by individual surveys carried out in situ. For the years from 2003 to 2011 and from 2016 onwards, suitable satellites were available. In the years …

KomPass: Article from 28.11.2023 | Last changed: 12.12.2024

FW-I-3 + 4: Forest condition and dieback rate

… spruce and pine trees, crown defoliation was higher than after the extreme year of 2003. As far as deciduous trees are concerned, the values fluctuated strongly from … forest condition in respect of beech, spruce and pine trees was worse than after 2003, the ‘summer of the century’. As far as oak trees are concerned, there has been … spruce and pine trees, crown defoliation was higher than after the extreme year of 2003. As far as deciduous trees are concerned, the values fluctuated strongly from …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

GE-I-9: Ozone burden

The picture shows the exhaust pipe of a motor car emitting exhaust gases.

… thus largely leading to ozone concentrations stagnating during the peak season. In 2003 and 2018, extreme weather conditions led to high ozone burdens. GE-I-9: Ozone … specific weather patterns occurring in summer. For example, the ‘ozone summer’ of 2003, during a particularly long period of sunny summer weather with above-average … thus largely leading to ozone concentrations stagnating during the peak season. In 2003 and 2018, extreme weather conditions led to high ozone burdens. … According to …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

FW-I-6 + 7: Endangered spruce stands and spruce bark beetle

… show that beetle infestations caused as a result of the heat and drought year 2003 increased rapidly in nearly all the Federal Länder examined. The after-effects … of damaged timber again reached roughly the level experienced in the hot summer of 2003. After the warm summer of 2015, the volume of damaged timber first increased … show that beetle infestations caused as a result of the heat and drought year 2003 increased rapidly in nearly all the Federal Länder examined. The after-effects …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

Effects chain – Example presentation from the ‘woodland and forestry’ act

… increases as a result of high temperatures. Since the ‘summer of the century’ in 2003, such dry phases in summer have occurred frequently, resulting in soils drying … increases as a result of high temperatures. Since the ‘summer of the century’ in 2003, such dry phases in summer have occurred frequently, resulting in soils drying …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

Effects chain – Example presentation from the ‘soil’ action field

… the evaporation in summer increases as a result of high temperatures. Since 2003 there have been particularly frequent incidents of dry phases in summer. As far … the evaporation in summer increases as a result of high temperatures. Since 2003 there have been particularly frequent incidents of dry phases in summer. As far …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

FW-I-8: Forest fire hazards and forest fires

The picture shows an extensive forest fire. Greyish-white smoke is rising from the seat of the fire. A burnt forest area is visible in the background.

… gradually. However, when there are years with abrupt changes – as for instance in 2003 and latterly in the years of 2018 and 2019 – which witnessed frequent and some … during the examined time period up until 2017. However, in the dry years of 2003, 2006, 2015 and 2016 it is possible to see that there were higher risks of … gradually. However, when there are years with abrupt changes – as for instance in 2003 and latterly in the years of 2018 and 2019 – which witnessed frequent and some …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

Effects chain – Example presentation from the ‘trade and industry’ action

… water bodies after utilisation. This occurred, for example, in the hot summers of 2003, 2006, 2018 and latterly 2022, when owing to prolonged heat and drought, … water bodies after utilisation. This occurred, for example, in the hot summers of 2003, 2006, 2018 and latterly 2022, when owing to prolonged heat and drought, …

KomPass: Article from 28.11.2023 | Last changed: 18.11.2025

KM-I-1: Water temperature in the sea

The picture shows a view of the surface of the sea from below. The sun’s rays are beaming through the water’s surface. The sea is coloured dark blue to turquoise-green.

… temperatures were recorded on Germany’s coasts in the exceptionally hot summer of 2003. In August of that year, the mean surface temperature measured across the … resulting from extreme warming in the summer months – amounted to 11.0 °C (2003, 2006, 2016, 2020) and above (11.4 °C, 2014), and latterly 11.2 °C (in 2022). … temperatures were recorded on Germany’s coasts in the exceptionally hot summer of 2003. In August of that year, the mean surface temperature measured across the …