Analyse und Kommunikation der beobachteten Klimatrends in Deutschland

Imbery, Florian; Kaspar, Frank; Friedrich, Karsten

doi:10.5194/dach2022-279

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, due to the extraordinary warm winter, our data itself does not allow a conclusion about minimum temperature, which can be tolerated by overwintering mosquitoes. The winter 2019/2020 was the second warmest ever recorded in Germany with temperatures 3.9°C above the reference years 1961–1990 ( Imbery et al 2021 ). In line with observations from caves ( Mammola et al 2019 ), the abiotic conditions inside the hibernation site were strongly dependent on the outdoor temperature.…”

Section: Discussionmentioning

confidence: 98%

Effects of Hibernation Site, Temperature, and Humidity on the Abundance and Survival of Overwintering Culex pipiens pipiens and Anopheles messeae (Diptera: Culicidae)

Sauer

Timmermann

Lange

et al. 2022

Journal of Medical Entomology

View full text Add to dashboard Cite

Knowledge of the hibernation site preferences and the factors which influence winter survival in these hibernation sites may enhance understanding of mosquito population dynamics after winter and how arboviruses persist in temperate regions. Our study quantified the number of adult overwintering mosquitoes in cellars and aboveground constructions and analyzed survival rates in relation to the environmental conditions in these sites. During the winters 2016/2017 and 2018/2019, 149 different constructions in Northwest Germany were sampled for mosquitoes. Mosquitoes were detected in 44% of the cellars and in 33% of the aboveground constructions. Culex p. pipiens Linnaeus was the most abundant species in cellars, whereas high numbers of Anopheles messeae Falleroni were collected from a single barn. Subsequently, an enclosure study was conducted during 2019/2020. Overwintering field-collected Cx. p. pipiens and An. messeae were divided into groups with or without fructose availability, and placed in cages with different man-made hibernations sites, where temperature and relative humidity were recorded hourly. For both species, increasing mean temperatures (5–16°C) but not mean relative humidity (58–94%) were correlated with winter mortality rates of the mosquitoes. The lipid measurements were greater and mortality rates were lower when both species were provided fructose. Larger specimens (determined by wing length) stored more lipids, and in Cx. p pipiens, but not in An. messeae, survival probability of large specimens was significantly greater than for small females. Mosquitoes showed a distinct pattern in the selection of overwintering sites, while temperature was an important driver for survival.

show abstract

Section: Discussionmentioning

confidence: 98%

Effects of Hibernation Site, Temperature, and Humidity on the Abundance and Survival of Overwintering Culex pipiens pipiens and Anopheles messeae (Diptera: Culicidae)

Sauer

Timmermann

Lange

et al. 2022

Journal of Medical Entomology

View full text Add to dashboard Cite

show abstract

“…Germany has a humid temperate climate with warm summers (Koeppen, 1936). The annual rainfall rates average to 791.3 mm within Germany and annual mean temperatures are 9.3 °C for the current reference period of 1971-2020 (Imbery et al, 2021). Highest temperatures on average can be found in the Upper Rhine Valley and the Neckar Valley in the south-east and the Upper Rhine area in western Germany.…”

Section: Figurementioning

confidence: 89%

“…The averaged start of the vegetation growing season in Germany also shows earliest start of vegetation growth in the areas with the highest temperatures and latest start of growing season in areas of higher altitudes (Figure 1C). The years 2018, 2019 and 2020 were unusually warm compared to the years since systematic weather recordings (Imbery et al, 2021) with mean temperature anomalies of +2.3 K, +2.1 K and +2.2 K compared to the reference period of 1961-1990, respectively (Imbery et al, 2021 (Figure 1D). In addition, 2018 was extremely dry as mean precipitation rates were 586.3 mm, which is 202.6 mm lower than the average of the reference period 1961-1990(DWD, 2020.…”

Section: Figurementioning

confidence: 96%

Multi-annual grassland mowing dynamics in Germany: spatio-temporal patterns and the influence of climate, topographic and socio-political conditions

Reinermann

Asam

Geßner

et al. 2023

Front. Environ. Sci.

View full text Add to dashboard Cite

Introduction: Grasslands cover one third of the agricultural area in Germany and are mainly used for fodder production. However, grasslands fulfill many other ecosystem functions, like carbon storage, water filtration and the provision of habitats. In Germany, grasslands are mown and/or grazed multiple times during the year. The type and timing of management activities and the use intensity vary strongly, however co-determine grassland functions. Large-scale spatial information on grassland activities and use intensity in Germany is limited and not openly provided. In addition, the cause for patterns of varying mowing intensity are usually not known on a spatial scale as data on the incentives of farmers behind grassland management decisions is not available.Methods: We applied an algorithm based on a thresholding approach utilizing Sentinel-2 time series to detect grassland mowing events to investigate mowing dynamics in Germany in 2018–2021. The detected mowing events were validated with an independent dataset based on the examination of public webcam images. We analyzed spatial and temporal patterns of the mowing dynamics and relationships to climatic, topographic, soil or socio-political conditions.Results: We found that most intensively used grasslands can be found in southern/south-eastern Germany, followed by areas in northern Germany. This pattern stays the same among the investigated years, but we found variations on smaller scales. The mowing event detection shows higher accuracies in 2019 and 2020 (F1 = 0.64 and 0.63) compared to 2018 and 2021 (F1 = 0.52 and 0.50). We found a significant but weak (R2 of 0–0.13) relationship for a spatial correlation of mowing frequency and climate as well as topographic variables for the grassland areas in Germany. Further results indicate a clear value range of topographic and climatic conditions, characteristic for intensive grassland use. Extensive grassland use takes place everywhere in Germany and on the entire spectrum of topographic and climatic conditions in Germany. Natura 2000 grasslands are used less intensive but this pattern is not consistent among all sites.Discussion: Our findings on mowing dynamics and relationships to abiotic and socio-political conditions in Germany reveal important aspects of grassland management, including incentives of farmers.

show abstract

“…Despite this trend, due to weather, the heat generation in 2021 from solar thermal systems was 8.4 billion kWh, approximately five percent less than in 2020 (8.9 billion kWh) [1]. To further advance the construction and use of renewable energy, it is essential to develop more effective seasonal thermal energy to take advantage of the discrepancy between the available heat in summer and the required heat in winter [2]. For seasonal heat storage, thermochemical heat stores are of particular interest, as they have much higher theoretical energy storage densities (100-400 kWh/m 3 ) than sensible (20-100 kWh/m 3 ) and latent heat stores (50-150 kWh/m 3 ) and can be stored without losses [3].…”

Section: Introductionmentioning

confidence: 99%

Alterations of a CaCl2 Alginate Composite for Thermochemical Heat Storage during the Hydration in a 1 L Packed Bed Laboratory Reactor

Heitmann,

Simon,

Osburg

et al. 2023

Thermo

View full text Add to dashboard Cite

A composite material of alginate and CaCl2 was tested in a laboratory reactor (1 L) for its ability to thermochemically store heat. The material was exposed to air at 25 °C and 25% RH to prevent the salt from dissolving, and the heat evolution was observed over a period of 15 cycles. To evaluate the changes in the material, samples were taken after 5, 10 and 15 cycles and the material properties and calorimetric characteristics were examined. A change of the material in favor of the heat release was determined, so that an increase of the heat storage capacity from 1.28 kJ∙cm−3 to 2.11 kJ∙cm−3 was detected, with a simultaneous steep decrease of the pore volume in the range from 0.01 to 10 μm. The temperature lift of the reactor showed a significant increase, with the first cycle showing the smallest amount.

show abstract

Analyse und Kommunikation der beobachteten Klimatrends in Deutschland

Cited by 3 publications

References 0 publications

Effects of Hibernation Site, Temperature, and Humidity on the Abundance and Survival of Overwintering Culex pipiens pipiens and Anopheles messeae (Diptera: Culicidae)

Effects of Hibernation Site, Temperature, and Humidity on the Abundance and Survival of Overwintering Culex pipiens pipiens and Anopheles messeae (Diptera: Culicidae)

Multi-annual grassland mowing dynamics in Germany: spatio-temporal patterns and the influence of climate, topographic and socio-political conditions

Alterations of a CaCl2 Alginate Composite for Thermochemical Heat Storage during the Hydration in a 1 L Packed Bed Laboratory Reactor

Contact Info

Product

Resources

About