Publikasjoner

EVDC.

Fjæraa, A.M.; Boyd, I.; Espe, T.

Evidence for a recurring eastern North America upper tropospheric ozone maximum during summer.

Cooper, O. R.; Trainer, M.; Thompson, A.M.; Oltmans, S.J.; Tarasick, D.W.; Witte, J.C.; Stohl, A.; Eckhardt, S.; Lelieveld, J.; Newchurch, M.J.; Johnson, B.J.; Kalnajs, L.; Dubey, M.K.; Leblanc, T.; McDermid, I.S.; Forbes, G.; Wolfe, D.; Carey-Smith, T.; Morris, G.A.; Lefer, B.; Rappenglück, B.; Joseph, E.; Schmidlin, F.; Meagher, J.; Fehsenfeld, F.C.; Keating, T.J.; Van Curen, R.A.; Minschwaner, K.

Evidence for long-range transport of North American anthropogenic and wildfire emissions to Europe from airborne and ground based lidar measurements during European ITOP (IGAC Lagrangian 2K4, ICARTT.

Law, K.; Schlager, H.; Real, E.; Ancellet, G.; Huntrieser, H.; Petzold, A.; Haeffelin, M.; Pietras, C.; Nedelec, P.; Stohl, A.; Methven, J.; Arnold, S.; Parrish, D.; Ryerson, T.; Lewis, A.; Avery, M.; Sachse, G.; Arnold, F.; Spidel, M.; Fischer, H.; Gurck, C.; Mihalopoulos, N.

Evidence for the presence of natural halogenated hydrocarbons in southern Norwegian and polar air.

Vetter, W.; Schlabach, M.; Kallenborn, R.

Evidence from firn air for recent decreases in non-methane hydrocarbons and a 20th century increase in nitrogen oxides in the northern hemisphere.

Worton, D.R.; Sturges, W.T.; Reeves, C.E.; Newland, M.J.; Penkett, S.A.; Atlas, E.; Stroud, V.; Johnson, K.; Schmidbauer, N.; Solberg, S.; Schwander, J.; Barnola, J.-M.

Evidence that the efficiency of wet removal of Arctic aerosols is controlled by atmospheric temperature. NILU F

Tietze, K.; Garrett, T.J.; Riedi, J.; Zhao, C.; Stohl, A.

Evolution of Near‐Term Atmospheric Methane and Associated Temperature Response Under the Global Methane Pledge: Insights From an Earth System Model

Abstract Methane is a powerful greenhouse gas with a shorter lifetime than carbon dioxide (CO 2 ), making it an important target for near‐term climate action. The Global Methane Pledge (GMP) aims to cut anthropogenic methane emissions by 30% from 2020 levels by 2030. Using an Earth system model with interactive CH 4 sources and sinks, we assess the Pledge's impact through 2050. Results show that current GMP commitments deliver only a 10% cut by 2030—well below the target. Only the maximum technically feasible reduction (MTFR) pathway can achieve the 30% goal. By 2050, current GMP commitments lowers methane concentrations by 3% relative to 2025, while MTFR achieves 8%. Both pathways slow warming slightly, avoiding about 0.1°C of global temperature rise, with the Arctic seeing the greatest benefits (up to 2°C less warming). Without wider participation, the GMP with current signatories will fall short of its targets and Paris Agreement goals.

Evolution of semi-volatile organic compounds (SVOCs) in surface snow. Poster presentation. NILU F

Villa, S.V.; Herbert, B.M.J.; Halsall, C.J.; Thomas, G.O.; Jones, K.C.; Kallenborn, R.

Evolving trends in application of low-cost air quality sensor networks: challenges and future directions

Abstract Low-cost air quality sensors (LCS) are increasingly used to complement traditional air quality monitoring yet concerns about their accuracy and fitness-for-purpose persist. This scoping review investigates topics, methods, and technologies in the application of LCS networks in recent years that are gaining momentum, focusing on LCS networks (LCSN) operation, drone-based and mobile monitoring, data fusion/assimilation, and community engagement. We identify several key challenges remaining. A major limitation is the absence of unified performance metrics and cross-validation methods to compare different LCSN calibration and imputation techniques and meta-analyses. LCSN still face challenges in effectively sharing and interpreting data due to a lack of common protocols and standardized definitions, which can hinder collaboration and data integration across different systems. In mobile monitoring, LCS siting, orientation, and platform speed are challenges to data consistency of different LCS types and limit the transferability of static calibration models to mobile settings. For drone-based monitoring, rotor downwash, LCS placement, flight pattern, and environmental variability complicate accurate measurements. In integrating LCS data with air quality models or data assimilation, realistic uncertainty quantification, ideally at the individual measurement level, remains a major obstacle. Finally, citizen science initiatives often encounter motivational, technological, economic, societal, and regulatory barriers that hinder their scalability and long-term impact.

Exceptional aerosol load observed in the Arctic during summer 2019

Exercises for the VAST demonstration volcanic ash forecast system.

Arnold, D.; Bialek, J.; O'Dowd, C.; Kristiansen, N.I.; Martin, D.; Maurer, C.; Miklos, E.; Prata, F.; Radulescu, R.; Sollum, E.; Sofiev, M.; Stebel, K.; Stohl, A.; Vira, J.; Wotawa, G.

Expanding the applicability of multimedia fate models to polar organic chemicals. NILU F

Breivik, K.; Wania, F.

Expectations of Future Natural Hazards in Human Adaptation to Concurrent Extreme Events in the Colorado River Basin

Human adaptation to climate change is the outcome of long-term decisions continuously made and revised by local communities. Adaptation choices can be represented by economic investment models in which the often large upfront cost of adaptation is offset by the future benefits of avoiding losses due to future natural hazards. In this context, we investigate the role that expectations of future natural hazards have on adaptation in the Colorado River basin of the USA. We apply an innovative approach that quantifies the impacts of changes in concurrent climate extremes, with a focus on flooding events. By including the expectation of future natural hazards in adaptation models, we examine how public policies can focus on this component to support local community adaptation efforts. Findings indicate that considering the concurrent distribution of several variables makes quantification and prediction of extremes easier, more realistic, and consequently improves our capability to model human systems adaptation. Hazard expectation is a leading force in adaptation. Even without assuming increases in exposure, the Colorado River basin is expected to face harsh increases in damage from flooding events unless local communities are able to incorporate climate change and expected increases in extremes in their adaptation planning and decision making.