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The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa.

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Presentation on theme: "The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa."— Presentation transcript:

1 The seasonal variations of the climatic circulation of the Black Sea waters along the axis of divergence zone. O.R.Andrianova, R.R.Belevich, M.I.Skipa Hydroacoustic Branch of MHI NASU Odessa, Ukraine Odessa, Ukraine

2 The aim of this work is : detecting of features of the seasonal water circulation in the surface and intermediate layers of the Black Sea open waters, which is based on an analysis of the dynamic heights distribution along the axis of the main Black Sea divergence zone.

3 The map of the temperature and salinity data by squares in the Black Sea

4 Annual climatic maps of the dynamic topography layers of the Black Sea (dotted line is the position of the axis of the divergence zone). (a) 0-50 m (b) m

5 The distribution of the dynamic heights along an divergence zone axis of the Black Sea by months for layer 0-50m 1, 3 – centers of western and eastern cyclonic gyres, 2-ridge, ellipses schematically show the positions of the cyclonic gyres, I-XII - months.

6 Ellipses schematically show the positions of the cyclonic gyres, vertical line - ridge, dotted lines – centers of the cyclonic gyres. 1- Coastal back and forth current 2- Main Black Seas current 3 - Counter current 4 - Western branch of the Western cyclonic gyre 5 - Eastern branch of the Western cyclonic gyre 6 - Western branch of the Eastern cyclonic gyre 7- Eastern branch of the Eastern cyclonic gyre The distribution of the dynamic topography along the axis of the divergence zone for the horizons by the seasons

7 Annual climatic map of dynamic topography of layer m of the Black Sea (dotted line shows the position of the axis of the divergence zone).

8 a) - winter, spring; b) - summer, autumn.a) - winter, spring; b) - summer, autumn. Winter (1,3,5); Spring (2,4,6); Summer (7,9,11); Autumn (8,10,12)Winter (1,3,5); Spring (2,4,6); Summer (7,9,11); Autumn (8,10,12) Western Zn (1,2,7,8); Ridge (3,4,9,10); Eastern Zn (5,6,11,12)Western Zn (1,2,7,8); Ridge (3,4,9,10); Eastern Zn (5,6,11,12) The scheme of the position of the centers of western and eastern cyclonic gyres and the ridge by the depth, by longitude and by the seasons

9 Climatic characteristics of the cyclonic circulations in the Black Sea along the axis of the divergence zone Season West cyclonic gyre zone Ridge East cyclonic gyre zone Length Width Center location Length Width Center location Winter Spring Summer Autumn (Values shown in degrees of East longitude)

10 Conclusions For the first time the divergence zone of the Black Sea was identified and described. For the first time the divergence zone of the Black Sea was identified and described. The axis of divergence zone was determined. This axis is situated in the middle part of the Black Sea and stretches from south coast of Bulgaria till south coast of Caucasus. The axis of divergence zone was determined. This axis is situated in the middle part of the Black Sea and stretches from south coast of Bulgaria till south coast of Caucasus. The specific features of the structure, spatial distribution and seasonal variability of flows and gyres that placed along the divergences zone in the surface and intermediate layers were found out. The specific features of the structure, spatial distribution and seasonal variability of flows and gyres that placed along the divergences zone in the surface and intermediate layers were found out. Seasonal variability of positions and intensity were estimated for Main Black Seas Current, cyclonic gyres and ridge. Velocities of the currents were calculated. Seasonal variability of positions and intensity were estimated for Main Black Seas Current, cyclonic gyres and ridge. Velocities of the currents were calculated. The impact of spring floods of the rivers in the north-western region of Black Sea to the water circulation in the surface layers in the open sea area was described. The impact of spring floods of the rivers in the north-western region of Black Sea to the water circulation in the surface layers in the open sea area was described. Three separate types of the circulation in the open waters of the Black Sea were detected in an annual cycle: Three separate types of the circulation in the open waters of the Black Sea were detected in an annual cycle: - In winter equivalent western and eastern cyclonic gyres occur. - In spring western cyclonic gyre dominates. - In summer and autumn the eastern cyclonic gyre dominates. Obtained results certainly should be very important for data analysis and development of prognostic models of ecological situations in the Black Sea. Obtained results certainly should be very important for data analysis and development of prognostic models of ecological situations in the Black Sea.

11 Thanks for your attention!

12 The average (normal component) current velocity (cm / s) according to the season in streams of water allocated along the divergence of horizons (m) WINTER м CBF C MBS C CC WB WZn EBWZnWBEZnEBEZnCCMBSCCBFC SPRING м CBF C MBSC+WBWZnEBWZn WBE Zn EBEZnCCMBSCCBFC E ,6

13 SUMMER м CBF C MBSC+WBWZnEBWZn WBE Zn EBEZn + MBSCCBFC AUTUMN м CBF C MBS C CCWBWZnEBWZn WBE Zn EBEZnCCMBSCCBFC E ,6 The average (normal component) current velocity (cm / s) according to the season in streams of water allocated along the divergence of horizons (m)

14 The scheme of water circulation in the Black Sea 1 – Main Black sea current (MBSC) – average position of a core; 2 – meanders of MBSC; 3 – Coastal anticyclonic eddy (CAE); 4 – cyclonic eddy (CE); 5 – Batumi anticyclonic eddy; 6 – Kaliakra CAE; 7 – Sevastopol CAE; 8 – Kerch CAE; 9 – quasistationary cyclonic gyre.


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