Publikasjoner

The impact of the Arctic sea ice loss and variation on lower latitudes

Koenigk, Torben; Gao, Yongqi; Gastineau, Guillaume; Keenlyside, Noel; Nakamura, Tetsu; Ogawa, Fumiaki; Orsolini, Yvan; Semenov, Vladimir; Suo, Lingling; Tian, Tian; Yang, Shuting; Wang, Tao

The impact of tropospheric blocking on the duration of the sudden stratospheric warmings in boreal winter 2023/24

Vorobeva, Ekaterina; Orsolini, Yvan

The winter of 2023/24 exhibited remarkable stratospheric dynamics with multiple sudden stratospheric warmings (SSWs). Based on the fifth-generation European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis (ERA5) polar-cap-averaged 10 hPa zonal wind, three major SSWs are identified. Two of the three SSWs were short-lived, lasting under 7 d. In this study, we give an overview of the three SSWs that occurred in the winter of 2023/24 and focus on the impact of tropospheric forcing on their duration. Blocking high-pressure systems are shown to modulate wave activity flux into the stratosphere through interactions with tropospheric planetary waves, depending on their location. The rapid termination of the first SSW (14–19 January 2024) is linked to a developing high-pressure system over the North Pacific. The second SSW (16–22 February 2024) terminated quickly due to more contributing factors, one of which was a high-pressure system that developed over the Far East. The third SSW (3–28 March 2024) was a long-duration canonical event extending to levels below 100 hPa. In contrast to the two short-lived SSWs in the winter of 2023/24, tropospheric forcing was sustained around the SSW onset in March 2024, allowing a long event to develop. We also note that conditions for these SSWs were particularly favorable due to external factors, including an easterly Quasi-Biennial Oscillation (QBO), the presence of El Niño conditions of the El Niño–Southern Oscillation (ENSO) cycle, and the proximity to the solar maximum.

The Impacts of Snow Assimilation on Seasonal Prediction over the Third Pole

Orsolini, Yvan; Senan, Retish; Rosnay, Patricia de

The IMPACTs project and recent developments of EMEP.

Tørseth, K.

The importance of applying "clean" and validated quantification techniques for studying environmental levels of materials used by consumers. Poster presentation. NILU F

Salvito, D.T.; Kallenborn, R.; Chiu, P.; Allen, H.E.

The importance of biomass burning as a source of BC in the European Arctic - Based on measurements at the Zeppelin Observatory, Svalbard. NILU F

Myhre, C.L.; Yttri, K.E.; Eckhardt, S.; Stohl, A.; Fiebig, M.; Dye, C.; Ström, J.; Klimont, Z.

The importance of diet on exposure to and effects of persistent organic pollutants on human health in the Arctic.

Odland, J.O.; Deutch, B.; Hansen, J.C.; Burkow, I.C.

The importance of nitrogen oxides for the exceedance of critical thresholds in the Nordic countries.

Johansson, M.; Suutari, R.; Bak, J.; Lövblad, G.; Posch, M.; Simpson, D.; Tuovinen, J.P.; Törseth, K.

The importance of temporal variables in environmental modelling: Rationalizing measured concentrations of cyclic volatile methyl siloxanes in an Arctic lake.

Krogseth, I.S.; Whelan, M.J.; Christensen, G.N.; Breivik, K.; Evenset, A.; Warner, N.A.

The influence of UVR and climate conditions on fish stocks: a case study of the Northeast arctic cod (UVAC). NILU F

Hansen, G.

The influence of background ozone concentrations on the emission abatement strategies (NEPAP WP 2). NILU F

Solberg, S.

The influence of cruise ship emissions on air pollution in Svalbard.

Eckhardt, S.; Hermansen, O.; Grythe, H.; Fiebig, M.; Stebel, K.; Cassiani, M.; Baecklund, A.; Stohl, A.

The influence of particles on ozone depletion - model calculations. Risø-R-934(EN)

Fløisand, I.; Stordal, F.; Larsen, N.; Knudsen, B.; Rognerud, B.; Isaksen, I S A.