1. European Conference on Applications of Meteorology/ EMS Annual Meeting
Meteorological conditions of ice and snow accretion in the southern and central regions of Ukraine
Khomenko Inna, Odessa State Environmental University, Ukraine

2. In order to study conditions of atmospheric icing near the surface such as glaze, soft and hard rime, snow accretion, the data for 39 stations of Ukraine are used for period of
Database contains temperature, wind speed and wind direction in the beginning of icing accretion and at the moment that the accretion reached maximum in the size.

3. Vinnytsia region
Kirovohrad region
Mykolayv region
Kherson region
Odessa region

5. Classification of sites according to the severity of icing
Intensity of icing is calculated according the formula (1)
after integration of formula (1)
we obtained
(1)
(2)
collision efficiency,
liquid water mass/unit volume,
sticking efficiency,
wind speed,
freezing efficiency,
cross-sectional area of object.

6. Classification of sites of Ukraine according to the severity of icing

7. Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface
The most glaze events (about 87%) are connected
with the narrow negative temperature from 0 to -4 C.
GLAZE
51%
In a half of these cases the slightly negative
temperatures are observed from -1 to 0.
87% 7

8. Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface
HARD RIME
32%
For the hard rime the more wide
temperature interval (-8…-1) is typical.
82%
32% from these cases are associated
with temperatures from -6 to -4. 8

9. in which 74% of all the soft rime cases occur.
Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface
The soft rime events are distributed almost evenly in the interval -20…-6,
in which 74% of all the soft rime cases occur.
SOFT RIME
The most cases take place under -16…-10 temperature.
58%
74% 9

10. Approximately 90% of the wet snow cases
Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface
WET SNOW
93%
Approximately 90% of the wet snow cases
are related with the -1…+1 C interval. 10

11. Frequency distribution of wind direction in the beginning of atmospheric icing near the surface
The most number of hard and soft
rime cases are reported under calm
(soft rime 38%, hard rime 25%).
For the hard rime the remaining cases are distributed evenly
in the other graduations. And for the soft rime the north direction
with the highest frequency is obtained.
14%

12. Frequency distribution of wind direction in the beginning of atmospheric icing near the surface
Frequency of the glaze cases
under the calm is significant.
66% 8%
60%
For the glaze surface wind is characterized by
high occurrence frequency of north, north-east,
east and south-east directions
with the maximum for north-east and east directions.

13. Frequency distribution of in the duration of accretion of ice.
Frequency distribution of wind direction at the moment, in which the icing accretion reached maximum in size
Frequency distribution of
the wind direction are
almost unchangeable
in the duration of accretion of ice.

14. Frequency of occurrence of glaze in the beginning of the event as a function air temperature and wind speed

15. Frequency of occurrence of hard rime in the beginning of the event as a function air temperature and wind speed

16. Frequency of occurrence of soft rime in the beginning of the event as a function air temperature and wind speed

17. Frequency of occurrence of wet snow in the beginning of the event as a function air temperature and wind speed

18. The further steps:
similar technique is applied to the other regions of Ukraine; application of regression analysis to the wind-temperature plot, obtained for different types of icing, and dividing the icing into different areas by temperature and wind speed for different regions of Ukraine; classification of the territory of Ukraine, using the site icing index.