Synoptic- to meso-scale diagnosis of dynamical processes, which govern the intensification of wildfire activity


Christo Georgiev (NIMH) presents influence of synoptic and mesoscale dynamical process, through water vapour imagery, on the intensification of wildfires.


Studies of large fires in Australia, Tasmania, USA and Southeastern Europe have shown a link between fire activity and dry stratospheric intrusions with downward transport of energy and momentum down to the lower troposphere. In such cases the rapid increase of fire activity was accompanied by a dry band in satellite Water Vapour (WV) imagery, which is indicative of pronounced descent of upper-tropospheric or stratospheric air which is normally much dryer than the lower tropospheric one and has much higher potential vorticity. When these descending air masses, reach the Earth’s surface they affect the wind speed, moisture and ozone concentration, which could generate a spike in fire activity.
Case-study examples of such severe events over areas of Central and Eastern Mediterranean are considered in the presentation. Combination of WV imagery, satellite soundings and satellite estimations of fire radiative energy contribute to better understanding of dry stratospheric intrusion depth and related dynamical processes, which govern the intensification of wildfire occurrence and spread.


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Lecture slides