Prof VLADO SPIRIDONOV
Submitted by vspiridonov@meteo.gov.mk
1000 SKOPJE,
REPUBLIC OF MACEDONIA
Presentation: "IMPACTS ON PHYSICAL AND CHEMICAL PROPERTIES OF A STORM FROM THE
TROPICAL-VS-MID-LATITUDE CONTRAST IN INSTABILITY AND HUMIDITY OF THE
ENVIRONMENT"
Vlado Spiridonov1 and
Mladjen Curic2
1) Hydrometeorological Institute of Macedonia
2) Department of Meteorology, Belgrade University, Serbia
Abstract:
Deep convective clouds play an important role in transport and scavenging of chemical
constituents, which is very important to understanding the composition of the troposphere and therefore
chemistry-climate and air quality studies. To improve the representation of sub-grid convective transport
and wet deposition in large-scale models, general characteristics, such as species mass flux, from the
high resolution cloud chemistry models can be used.
The impacts on physical and chemical properties of a storm from the tropical-vs-mid-latitude
contrast in instability and humidity of the environmentof are examined using a cloud resolving model with
aqueous phase sulfate chemistry module. The differences in cloud dynamics belongs to difference in
initial thermodynamic parameters which determine the potential instability, wind shear and turbulence.
The differences in rainfall efficiency attributed to differences in the interaction of cloud dynamics and
microphysics and precipitation flux processes. Tropical case has shown a more intensive sulfate transport
and redistribution and production which are attributed to high rainfall efficiency. In the heavy rainfall
period, tropical convective storm gives about an order of magnitude larger percentage contribution to
sulfur wet deposition relative to mid-latitude storm which has impact to increase rainwater pH and acidity
of rainfall. Predicted concentration for the mid-latitude case is giving reasonably good agreement with
observations. The greater difference in sulfate wet deposition in tropical case is due to specific case
simulation with chemical field initialization associate with continental (non-polluted) clouds, while the
observations are related to maximum annual mean observed sulfate wet deposition in tropics.
Keywords: Numerical experiment, tropical and continental storm, dynamics, microphysics, sulfate
chemistry, transport, redistribution, production, wet deposition
Submission area: Oral