Dept. of Geophysics Colloquium: Temperature Anomalies and Surface Impacts of Dry Intrusions

Zoom: https://tau-ac-il.zoom.us/j/86769967727?pwd=25OfJE7Na6lWggNsBNRbl7H8bnW56x.1

Abstract:

Dry intrusions embedded within large-scale synoptic systems have a strong impact on surface extremes, contributing to a wide range of high-impact events such as cold spells, dust storms, or extreme wildfires. This seminar examines dynamical processes that shape temperature anomalies within dry intrusions leading to surface extremes. Two case studies, from New York and southeast Australia, illustrate how synoptic scale organization and mesoscale structure govern surface impacts. In New-York, an extreme smoke pollution event was modulated by a large cyclonic system that redirected smoke transport, while in Australia the spread of wildfire was linked to the strength of an advancing cold front and the negative temperature anomaly associated with the descending dry intrusion.

The second part of the talk broadens to a global perspective, using global Lagrangian air mass trajectories and a temperature anomaly decomposition to quantify the adiabatic, advective and diabatic processes that form the temperature anomaly along the dry intrusion descent and near the surface. The resulting climatology clarifies the dynamical pathways through which descending air masses shape local extremes, while targeted case studies highlight the natural variability of these processes.

Event Organizer: Dr. Lior Rubanenko