Case study of a moisture intrusion over the Arctic with the ICON model: resolution dependence of its representation

• DOI: 10.5194/acp-2021-501
• Publication Date: 2021-07-12T05:37:11Z
• Authors: Hélène Bresson; Annette Rinke; Mario Mech; Daniel Reinert; Vera Schemann; Kerstin Ebell; Marion Maturilli; Carolina Viceto; Irina Gorodetskaya; Susane Crewell
• Keywords: 13. Climate action; 01 natural sciences; 0105 earth and related environmental sciences

Abstract. The Arctic is warming faster than the global average and any other region. One important factor for this poleward atmospheric transport of heat moisture, which contributes directly to surface air warming. In case study, circulation spatio-temporal structure a moisture intrusion event assessed, occurred during 5th 7th June 2017 over Nordic Seas an intensive measurement campaign Svalbard. This analysis focuses on high-spatial resolution simulations with ICON (ICOsahedral Non-hydrostatic) model put in context coarser runs as well ERA5 reanalysis. A variety observations including passive microwave satellite measurements used evaluation. operational forecasts from German Weather Service DWD at 13 km horizontal are drive high Limited Area Mode (LAM) 6 3 resolutions. results show skillfull capacity ICON-LAM represent observed selected its signature temperature, humidity wind profiles, radiation. offer higher accuracy reanalysis, compared observations. especially demonstrated representation changing vertical specific associated passing Ny-Ålesund (western Svalbard). Namely, increase 1–2 height topped by dry layer development low-level jet best represented simulation. study also demonstrates that such intrusions can have strong impact radiative turbulent fluxes surface. drastic decrease downward shortwave radiation ca. 500 W m−2 longwave 100 within hours determined, highlight importance both clouds energy budget.