The fluorescence lidar technology does not only enable a better determination of the origin of particles in the atmosphere. The method can also visualise particle layers that were previously practically invisible. This is the conclusion drawn by a team from the Leibniz Institute for Tropospheric Research (TROPOS) from the evaluation of 250 hours of lidar measurements over Leipzig in 2022 and 2023. The researchers had repeatedly observed very thin layers of smoke at high altitudes, which originated from forest fires in Canada but could not be seen using conventional methods. This suggests that the upper troposphere over Europe may be more polluted than previously assumed, especially during the summer forest fire season, the research team writes in the journal Atmospheric Chemistry and Physics. The observations suggest that thin layers of smoke can favour the formation of ice clouds. The fluorescence method offers great opportunities for a more detailed investigation of such interactions between aerosols and clouds.

The measurements in Leipzig are once again showing wildfire smoke from Canada. This smoke is therefore not only visible on satellite images, but can now be analysed in more detail using fluorescence lidar technology.

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A research team from the Urban and Transportation Systems Laboratory, Department of Architecture and Civil Engineering, Toyohashi University of Technology, conducted research on the impact of digital services alternative usage on equity and sustainability in cities. The study reveals how the use of digital services, such as online shopping and remote work, interacts with social networks and demographics to affect residential location choice and urban structure. The results of this research were published in the international academic journal "Sustainability".

Microplastics (MPs) and freshwater acidification jointly threaten aquatic ecosystems. This 21-day study on Eriocheir sinensis revealed synergistic toxicity: combined low pH (6.5) and MPs exacerbated oxidative stress and immune suppression, disrupted the TCA cycle and arginine biosynthesis, and altered gut microbiota function. While MPs alone affected pyrimidine metabolism, acidification amplified MPs' toxicity via immune-metabolic crosstalk. The findings underscore the need to evaluate multiple stressors under climate change, providing critical insights for aquatic risk assessment.

A Hong Kong University of Science and Technology (HKUST) research team led by Prof. SUN Jianwei and Prof. LIN Zhenyang from the Department of Chemistry has developed a catalytic enantioselective type II [5 + 2] cycloaddition method to address the challenges of synthesizing chiral bridged polycyclic structures, particularly those with a bridged seven-membered subunit. This innovative approach utilizes 3-oxidopyrylium ylides to create the desired complex shapes, paving the way for more applications in the rapid synthesis and diversification of other valuable complex molecules, including important natural products and drug molecules.