Salt domes influence on ice formation processes In

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Salt domes influence on ice formation processes In the North Caspian Sea Piter I.

Salt domes influence on ice formation processes In the North Caspian Sea Piter I. Bukharitsin Astrakhan State Technical University, Astrakhan, Russia, astrgo@mail. ru 2017

Introduction Open water leads form because of drift But there is a theory of

Introduction Open water leads form because of drift But there is a theory of thermodynamic effect that has big impact forming polynyas and maintaining leads as open water Polynyas form above salt domes where local effect of increased salinity was observed

History of Polynya Distribution 80 years of aerial and satellite observations Zone of land

History of Polynya Distribution 80 years of aerial and satellite observations Zone of land fast ice and zone of frequent polynya occurence

 Salt domes surfacing seabed in the North Caspian as per Brusilovsky, 1978 seismic

Salt domes surfacing seabed in the North Caspian as per Brusilovsky, 1978 seismic survey and gravimetric data (Glumov, I. F. , Malovtskiy, Ya. P. , Novikov, A. A. , Senin, B. V. , 2004. ) thermal Polynyas occurrence are indicated in the NE part

Ice concentration observations in the North Caspian as per Roshydromet.

Ice concentration observations in the North Caspian as per Roshydromet.

Seasonal variation of Salinity in 1972 1973 Average From surface ice samples From bottom

Seasonal variation of Salinity in 1972 1973 Average From surface ice samples From bottom ice samples From all samples Years 1972 826 1405 1085 1973 585 890 685

1 - 27. 12. 1973; 2 - 05. 01. 1974; 3 - 10. 01.

1 - 27. 12. 1973; 2 - 05. 01. 1974; 3 - 10. 01. 1974; 4 - 20. 01. 1974.

Discussion Aerials history shows leads coinciding with places of salt domes surfacing seabed field

Discussion Aerials history shows leads coinciding with places of salt domes surfacing seabed field works show ice salinity variation and weakening ice cover coinciding with salt dome positions These are good examples of how chemical and mechanical properties of ice affect ice cover behavior on the global scale in the region As for the Caspian more field work is required to confirm and study this effect

THANK YOU FOR ATTENTION

THANK YOU FOR ATTENTION