Research seminar, Michail Karalis, PhD student at MISU

Seminar

Date: Thursday 20 April 2023

Time: 14.15 – 14.45

Location: C609 Rossbysalen, MISU, Svante Arrhenius väg 16C, 6th floor

Title: Lagrangian simulations of warm-air intrusions using the AOSCM

Abstract

During warm air intrusion (WAI) episodes, moist air masses are advected poleward through the large-scale meridional flow and are transformed along the way, due to processes that are yet not well-understood and often misrepresented in numerical models. Here, we study the transformation of the air masses that reach the MOSAiC site in April 2020 from a Lagrangian view-point, using the Atmosphere Ocean Single Column Model (AOSCM). Backward trajectories initialized at different heights appear to line up vertically for up to 48-hours before the air-masses reach Polarstern, which indicates that advection could be represented by temporally varying surface boundary conditions. Analysis of observations collected from observation stations along the air-mass path, as well as ERA5 reanalysis data are used in addition to the Lagrangian simulations in order to help distinguish the timescales of the transformation and its driving mechanisms.

 

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