Eulerian and Lagrangian views of warm and moist air intrusions into summer Arctic

In this study, warm and moist air intrusions (WaMAI) over the sea sectors of Kara, Laptev, East Siberian Beaufort from 1979 to 2018 are identified in ERA5 reanalysis their air-mass transformation is analysed using interpolation satellite products along trajectories. The analysis shows that WaMAIs, driven by blocking high-pressure systems respective ocean sectors, induce surface warming (11–18 W m−2) ice melt positive anomalies net longwave radiation (5–8 turbulent flux (8–13 surface, although anomaly shortwave (−9 ~ +1 negative. From a Lagrangian perspective, energy-budget decreases linearly, while total column cloud liquid water (TCLW) increases linearly with downstream distance sea-ice edge. However, radiative effects both reach an equilibrium as TCLW much lower rate beyond 7 degrees north boundary-layer pattern can be categorized into two classes: radiation-dominated turbulence-dominated, comprised 26% 62% WaMAIs respectively. Statistically, turbulence-dominated cases occur 3 times stronger large-scale subsidence, also feature larger radiation. stratocumulus develops more strongly hence exerts forcing surface. categories, well-mixed boundary layer deepens 500 m trajectories, continuous mixing.